Thread: Electric cars are a pipe dream

  1. #2301
    Please use Sugar Cane Alcohol Billy T's Avatar
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    Quote Originally Posted by adoucette View Post
    ... If not, then what other fuel were you referring to that has a 3.5 to 1 volume ratio to a gallon of gasoline and also costs less than $1/gallon?... Arthur
    No other fuel than the one YOU assumed was in my tank (I have never said which of the dozen or so fuels would be there I have only calculated the tank's VOLUME.)

    For the fourth time:
    Quote Originally Posted by Billy T View Post
    ... So since it is impossible for me to have calculated a range for my tank what was I calculating in post 2198, which is replying to your post 2196? I have already told you in post 2294: I.e. YOU ASSUMED my 80 liter tank was filled with methane (at 3,600psi, I assume, but you did not tell the pressure you assumed.) and then you stated 80L of CH4 was the gasoline equivalent of 80L is 6.7 gallons, not me. (I have never told the gasoline equivalent of any of the gaseous fuels my tank could hold under pressure, which I have also never specified.) The point I was making in this part of 2198, was even only 6.7 gallons of gasoline would be about twice the range of current EVs and telling you that the tread was about EVs and their competitors for replacing gasoline fuel. I.e. IF my tank contained CH4 at 3,600psi, AS YOU ASSUMED, it would "beat the hell" out of current EVs in range. ...
    Quote Originally Posted by Billy T View Post
    ... If you had assumed the 21 gallon tank was filled with alcohol and then stated that was only the equivalent of 14.7 gallons of gasoline I would agree with that too, but I would protest if you said I had said the tank was full of alcohol, especially if you continue to falsely tell I said that after being told 19 times I did not; after being told that I only made a math model of a new tank geometry which compares the efficiency (stored volume to wall volume used) of the model's two tanks. After I had asked you 19 times to re-post my post saying it was fulled with alcohol instead of only repetedly asserting that I had said that. After 19 times I had told you that I never said any particular fuel was used in my tank. (In recent post, I drove that point home by listing more than a dozen fuels that could be.) After I never told the pressure my tank would use, but about dozen times later you still told that I had said it would be 3,600psi.

    If you want to comment on something I said, re-post my post and do so, put do not but words I never said in my mouth and then comment on those words. I have repeatedly asked you to do this, told you I never specified what was in the tank, or told what pressure it operates at, or that the round tank I compared to was the one in use today for storing CNG. (Not every one of the 19 times includes all of these, but 19 times you have been told with one or two of these "I never said X ...." or I request that you stop telling I said X but re-post my post saying X etc..

    Fact that after all these 19 requests for you to stop putting words in my mouth has been ignored and you continue to do so, and of course can not re-post where I said X (as I did not), can only be considered intentional lying about what I said.
    Last edited by Billy T; 11-19-11 at 08:45 AM.

  2. #2302
    Quote Originally Posted by Billy T View Post
    No other fuel than the one YOU assumed was in my tank (I have never said which of the dozen or so fuels would be there I have only calculated the tank's VOLUME.)

    For the fourth time:
    No Billy, you have not stated a SINGLE fuel that has a 3 to 1 gallon gas equivalent and is available for $1 gallon.

    Except for CNG at 3,600 psi

    Arthur

  3. #2303
    Please use Sugar Cane Alcohol Billy T's Avatar
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    Quote Originally Posted by adoucette View Post
    No Billy, you have not stated a SINGLE fuel that has a 3 to 1 gallon gas equivalent and is available for $1 gallon. Except for CNG at 3,600 psi Arthur
    That is correct. I have only agreed that IF tank were filled with CH4, AS YOU ASSUMED, it would beat the hell out of current EV's ranges and cost only about $1 / gallon of gasoline equivalent.

    If you had only stated the part I made bold above, you would be 100% correct. I have not stated a single fuel (to be in the tank). However, recently I did list about a dozen that could be.
    Last edited by Billy T; 11-19-11 at 08:57 AM.

  4. #2304
    More lying Billy.

    YOU put those two qualifications in the same post.

    You stated the 3 to 1 volume equivalent by using 7 gallons as the metric for your 21 gallon capacity tank and you stated the cost at below $1 per gallon.

    Here's your list:

    Methane, Propane, Butane, Hexane, Acetylene, and of course the currently used liquids, gasoline & several different alcohols, plus peanut and soy oil, etc. for diesel engines. I will not look it up, but I am quite sure Butane and Hexane become liquids at much lower pressure than CH4 does so the tank holding them as liquids would have much lighter weight when empty. (Use much less wall material and by my definition of "efficiency" be much more efficient than a CH4 tank.)
    Methane IS natural gas and the only way to get 7 GGE is to compress it to 3,600 psi

    Propane is 1.5 to 1 GGE, but it costs nearly $3 per gallon so fails.

    Butane costs the same as Propane so it also fails the cost test.

    http://www.neb.gc.ca/clf-nsi/rnrgynf...nmrkt-eng.html

    Hexane is a major part of gasoline and not any less expensive than gasoline.

    The other liquids such as Gasoline and Alcohol aren't available for $1 a gallon and don't require this complex tank and so resorting to them as a suggestion of the fuel is just SILLY.

    So again Billy the ONLY fuel that meets BOTH of your conditions in that post is CNG at 3,600 psi.

    Do you really want to continue trying to say that wasn't the fuel you were assuming in that post Billy, because it really is getting funny to watch you wiggle?

    Arthur

  5. #2305
    Please use Sugar Cane Alcohol Billy T's Avatar
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    Quote Originally Posted by adoucette View Post
    ... Do you really want to continue trying to say that wasn't the fuel you were assuming in that post Billy, because it really is getting funny to watch you wiggle? Arthur
    For the 5th time:

    I was not assuming any fuel. Never have. I was doing an analysis on the fuel YOU ASSUMED , which was CH4.

  6. #2306
    Quote Originally Posted by Billy T View Post
    For the 5th time:

    I was not assuming any fuel. Never have. I was doing an analysis on the fuel YOU ASSUMED , which was CH4.
    LOL

    Your squirming is friggin hilarious Billy.

    So let's go back to the post that started all this squirming shall we:

    http://sciforums.com/showpost.php?p=...postcount=2219

    Billy asks me to apologize for THESE specific posts:

    “ Originally Posted by adoucette
    {post 2191} Billy claims he has designed a flat CNG tank that he claims is 35% more efficient than any cylinderical tank in existence ...
    All HAIL Billy, If he can't design it, Nobody Can. Arthur ”

    “ Originally Posted by adoucette
    {post 2176} Clearly Billy has no expertise in engineering or materials and the proceeding is not based on anything but wishful thinking...
    Give it up Billy, you aren't an engineer* and your poor understanding of the issues around CNG gas storage is blatantly obvious.

    Then he posts a link to a tank designed for LOW PRESSURE Propane as proof of that I was wrong.

    When pointed out that the tank shown doesn't support his assertions as the pressure is ~1/16th that of CNG, Billy spends the next umpteen posts claiming he was never assuming CNG as the fuel.

    LOL

    Hoisted on your own petard once again Billy since you were specifically asking for an apology based on my assertions about the ability of your tank to hold the pressure of CNG.

    Arthur
    Last edited by adoucette; 11-19-11 at 10:39 AM.

  7. #2307
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    Quote Originally Posted by Billy T View Post
    Note billvon does not claim I said the tank held CNG pressurized at 3,600psi. He never put those words in my mouth.
    You were indeed talking about CNG. That was the only fuel ever mentioned up to that point, and that's what the discussion was about.

    Your denials remind me of someone who makes a simple math error (i.e. "9 x 4 =40") then tries to get out of it by saying "but . . . but . . . I was using base 9! I never said I was using base 10! Yeah, that's the ticket. You just assumed that it was base 10. Boy are you a stupid liar."

    You made a mistake. We all do.

  8. #2308
    Please use Sugar Cane Alcohol Billy T's Avatar
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    Quote Originally Posted by adoucette View Post
    ... Then he posts a link to a tank designed for LOW PRESSURE Propane as proof of that I was wrong. ... Arthur
    You said the tanks could not be built. Called it "Unobtainum" (or something like that. I am too busy to go back and get your exact word if that is not it). I showed a photo of one, to show it could be built, not to claim it would hold CH4. (The photo does not tell what is in the tank – only that it has been built.)

    I have never said what the tank would hold, but we earlier were discussing CH4 so it is reasonable that you and other might assume that would be the contents. What is false, lying, is for you to continue to say that I said it would hold CH4 at 3,600psi after I have told you about 19 times that:
    (1) I have never said what the tank hold or
    (2) What is the operational pressure limit of the tank.
    (3) That I am only doing math / geometry analysis of relative efficiency of flat tank vs. cylindrical tank.

    Billvon guessed, (incorrectly) that at 3,600psi it would explode or if made with thicker tension webs so it would not, it would be too heavy for a car to carry. Honestly - he had me worried as I too was thinking it would be useful for CH4 but I had never checked if the particular web sizes I had described could hold 3,600psi. It turned out they could if the tensile strength was 10% of the max that has been achieved.

    You see - I was not speaking of any pressure or any fuel but only about the novel geometry of compound tank with adjoining "shared walls" which is (I still think) more efficient than the conventional cylindrical tanks. The 35% more efficient claim may be before I had, at trippy's prompting added "filets" at the corners. They add to the wall mass and decrease the stored volume so do lower the efficiency.

    I am doing a very careful analysis of the geometry, which I will post (as told many posts back) in the physics forum, when it is done. My concern is and always has been with the relative efficiency of my "flat tank" vs. circular cylinder tank, which is a function of only the geometry. Why I have not been concerned with the operational pressure and what fuel is in the tank and never said anything about either.

    I defy you to find a post where I did. True when billvon said my tank would explode if it 3,600psi or Adoucette said if filled with CH4 it only had 6.7 gasoline equivalent; then I did use THEIR assumed pressures and gas to do some calculations.

    The first replying to Billvon showed his guesses were wrong. The second replying to adoucette pointed out that while true IF as adoucette assumed, it held CH4, that was only held 6.7 gallons of gasoline equivalent, it still "beat the hell" out of the current EVs in range.

    Replies to THEIR ASSUMPTIONS forced me to do calculations with THEIR values and gas fill, but that is not the same as my saying the tank would hold CH4 at 3,600psi. I have only computed the tanks volume - a geometric property of the tank. I will continue to defend that and challenge anyone to re-post my post (not a reply, where I am using CH4 or 3,600psi that OTHERS assumed) where I say what the tank pressure is or what fuel it holds.

    I don't have time (or inclination) to repeat this for the 20th time. Believe whatever you like, but you will not find a post of mine (except those two replies) where I tell either the pressure or what is in the tank. I am discussing geometry (except when forced to tell: "I did not say that" and give documentation.)

    When I finish the careful math model of the tank geometry analysis and post it in a new physic tread, I will return here, just to give a link to it.
    Last edited by Billy T; 11-19-11 at 02:48 PM.

  9. #2309
    Quote Originally Posted by Billy T View Post
    You said the tanks could not be built. Called it "Unobtainum" (or something like that. I am too busy to go back and get your exact word if that is not it). I showed a photo of one, to show it could be built, not to claim it would hold CH4. (The photo does not tell what is in the tank – only that it has been built.)
    BS
    I said the tanks couldn't be built with today's materials at a reasonable weight to hold CNG.
    In every post and link it was clear that I was discussing CNG.
    I kept bringing up the issue of PRESSURE over and over and over.

    Which you acknowledged that you were indeed considering pressures equal to standard round CNG tanks.


    I have never said what the tank would hold, but we earlier were discussing CH4 so it is reasonable that you and other might assume that would be the contents.
    Since that was the thing we were discussing, of course it's reasonable. More than that, you acknowledged you were considering pressures of standard round cylinders.

    What is false, lying, is for you to continue to say that I said it would hold CH4 at 3,600psi after I have told you about 19 times that:
    (1) I have never said what the tank hold or
    (2) What is the operational pressure limit of the tank.
    (3) That I am only doing math / geometry analysis of relative efficiency of flat tank vs. cylindrical tank.
    Because the issue is and always has been CNG storage, storage for things like Propane, butane, hexane etc is irrelevant.

    You see - I was not speaking of any pressure or any fuel but only about the novel geometry of compound tank with adjoining "shared walls" which is (I still think) more efficient than the conventional cylindrical tanks.
    NO, it is not more efficient than a cylindrical tank.
    It is more efficient only if you are trying to fill a square or rectangular space.

    Believe whatever you like,
    That through all of this you have not shown any evidence that your flat tank can be built to hold 3,600 psi CNG using existing materials and methods at a reasonable weight and price.

    Arthur

  10. #2310
    Why is the rum gone? Trippy's Avatar
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    Quote Originally Posted by Billy T View Post
    Post 2296 caused me to mention Acetylene (C2H2) which has a triple bond between the two carbons, so I assume it is more energetic fuel, molecule for molecule, than even gasoline (I'm only guessing, not asserting). It is easy to ship as calcium carbide (a solid, made from very cheap materials) and generate Acetylene as needed with water addition.* (Growing up in WV I knew about, even had, an Acetylene Lamp. Most coal miners did.) Acetylene is often burned, but perhaps would explode in an IC engine as it is compressed? (I tend to doubt it would as those three bonds must make it stable even if heated by the compression - again I'm just guessing based on what I know.)

    Acetylene would no doubt be a greater source of CO2 if used as a car fuel (Iso-octane is C8H18) as Acetylene has a carbon for every hydrogen converted to H2O but Acetylene would have less pressure trouble than other gaseous fuels and could be shipped long distances (as CaC2) in covered, atmospheric pressure, railroad cars.

    It is not used for car fuel, and I am not sure it could be economical competitive, but it is an interesting idea (to me at least). Perhaps even my flat tank cold be filled with calcium carbide, which was replaced at the filling station and have water injected at the average rate the Acetylene was being used. - I.e. have an internal pressure of only about 100psi.

    *All those ads you have seen telling that for X dollars, they would tell you how to run your car on water may not have been entirely crazy scams. Could our car fuel be made from coal and the huge deposits of calcium (not the "white cliffs of Dover" however. When other natural deposits have been used up, use sea shells. )?
    I've been asked for my thoughts on this, so here goes.

    I find this problematic on several levels. The first of which is the manufacture of calcium carbide in the first place - there's a one to one stoichiometry of calcium carbide produced and carbon monixde produce, so for every kg of calcium carbide produced, you're producing 0.69 kg of carbon dioxide, then there's a 2:1 stoichiometry of acetylene burned and carbon dioxide released, so for every kg of Acetylene burned, you release 1.7kg of Carbon Dioxide, and for every kg of acetylene you produce, you need 2.5kg of calcium carbide (again, it's a 1:1 stoichiometry. The combined result of which is that if we include the carbon dioxide produced during production as well as consumption (but not taking transport into account), for every kg of acetylene consumed, you've produced 3.4 kg of carbon dioxide (assuming i've done my math right).

    Another level I find this problematic on is the properties of calcium carbide itself. Technical grade calcium carbide is only 80-85% pure, and gives off Phosphine, Ammonia, and Hydrogen sulfide when hydrolyzed. All of which not only smell ruddy awful individually, have the potential to cause serious health issues when allowed to accumulate in relatively low concentrations in a confined space (such as the interior of a car). I also find elements of the SDS problematic, because it implies that any call out to an MVA, or a vehicle fire, would require Fire Officers to attend in full SCBA equipment (especially for a vehicle fire), and use only Class D Extinguishers, or similar equipment - you can't even use Halon type equipement on it. The reason why I state that even an MVA would require attendance in full SCBA, is because as near as I can see, any incident which potentialy results in a breach of the calcium carbide storage tank, or for that matter, any failure of the cutoff mechanism to prevent the introduction of water into the tank, could result (I would go as far as saying, probably will result) in a vehicle fire, so the fire service would have to treat every MVA as if it was a fire.

    The third aspect which I find troubling is the properties of acetylene itself. The UEL for acetylene is 100%, the LEL is 2.5%, acetylene undergoes an exothermic addition reaction that can produce wonderful things such as Benzene leading to explosive spontaneous reactions at pressures in excess of 200 kPa (29 psi), so 100 psi is definitely out of the question. This is also important to consider, because it requires the consideration of what might happen in the event of a relatively minor over pressure in the system, and illustrates one of the reasons that I suggest that every MVA would have to be treated as a vehicle fire, even if one hasn't developed - because there are a substantial number of failure modes from a simple MVA that have a high probability of leading to a vehicle fire. Acetylene is stored and transported safely by disolving it in Acetone or DMF, and putting it in a tank with Agamassan. The guy who developed this method, a Nobel Laureate by the name of Gustaf Dalen was himself blinded in an Acetylene explosion. so there's three reasons that I think that the use of Calcium Carbide isn't as good as it seems at first glance.

  11. #2311
    I'll take expensive flammable exploding vehicles for $500 Alex....

  12. #2312
    As a mother, I am telling you Syzygys's Avatar
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    GM's Volt caught fire after crash tests:

    http://www.slashgear.com/gm-tries-to...ting-29198576/

  13. #2313
    Please use Sugar Cane Alcohol Billy T's Avatar
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    " Volt will miss its sales target of 10,000 cars this year, the company said. ... Volt sales through November totaled 6,142, the company said.
    ... GM is expanding annual production to 60,000 units starting in January, ..."
    From: http://www.bloomberg.com/news/2011-1...in-hybrid.html

    More facts from this link:
    "dealers sold 1,139 of the plug-in hybrids last month,{November}" ...{Because}... GM last month allowed dealers to sell as many as 2,300 demonstration models to retail buyers, helping spur a 2.8 percent increase from October ..."

    6142 - 1139 = total of 5003 sold in first eight months of 2011. With the planned 60K annual production, Government Motors needs to sell at an 8 times higher rate than the "no dealer demo bargains" rate EVERY MONTH of 2012!

    Summary:
    Tax payer's only real hope of getting rest of their money back hangs on GM's sales in China being able to off set US excess Volt production losses.
    Last edited by Billy T; 12-01-11 at 03:08 PM.

  14. #2314
    Quote Originally Posted by adoucette View Post
    Well the October Sales figures are in:

    Volt sales are up significantly and even exceeded the LEAF sales, indicating that the price cut for the Volt and the price increase for the LEAF had a definite impact on buyers.

    GM sold 1,108 units in October (Still below LEAFs August sales even though an increase of almost 50% over September’s 723 units), and that puts the Volt at 5,003 vehicles for the year

    Nissan sold 849 LEAFs, which is down for the second month in a row and now is quite a bit below August's peak sales. Net for the year is 8,048.

    Or a combined average of 1,305 units of both EVs per month for the year.

    Still peanuts.

    On the other hand, even though it was another miserable month for EV sales, the Feds still shoveled out another $14.6 Million dollars to subsidize these lackluster sales.

    Arthur
    Well the November sales figures are in.



    The Chevy Volt continues to slowly increase its monthly sales and in November, sold 1,139 Volts. (+31 over October)

    On the other hand, the Nissan LEAF sales fell again to just 672 units. (-177 below October)

    So far in 2011, the Leaf has sold 8,738 copies in the U.S while the total sales for the Volt stands at 6,142.

    Which is 14,880 for both or even with $111 Million in Federal Subsidies so far this year (and more in State subsidies), just a paltry 1,352 vehicle sales per month.

    http://green.autoblog.com/2011/12/01...2-in-november/

  15. #2315
    Please use Sugar Cane Alcohol Billy T's Avatar
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    AFAIK this is the first car designed for CNG:

    "... The Zafira’s natural gas tanks are in the floor of the vehicle,* {and} holds about 55 lbs of natural gas. It should have a range of just over 300 miles. The Zafira Tourer 1.6 CNG Turbo Ecoflex has about 150 HP and puts out a maximum 155 ft./lbs. of torque. It reaches a top speed of 124 mph ..."
    Zafira Tourer Turbo EcoFlex (any fuel mix)
    It lives up to the “flex” part of its name, too – it can run on CNG, biofuel, or a mixture of the two. The Zafira Tourer even includes a 3.7 gallon emergency gas tank (standard gasoline), which gives it a 93 mile safety net.

    Tourer is also more fuel efficient and has lower CO2 emissions ... & the relative low cost of CNG means that the cost of operating the eco-Tourer is half that of a similar gas-driven vehicle. Opel’s green offering goes on sale in January of next year. ..."

    More at: http://gas2.org/2011/12/10/opel-zafi...most-anything/ or if you read German (or let Google translate) http://www.autobild.de/artikel/opel-...g-2327670.html

    And thanks to X-man for calling my attention to the type of car I posted about & predicted - One designed from scratch for CNG, not a standard car with CNG tank stuck in the trunk.

    * As I pointed out in several posts the weight of many parallel small diameter tubes holding CNG is no more than one large one. I.e. the efficiency of CNG tank does NOT depend upon the diameter of the tank. Easy to prove this as I have, when neglecting ends and these "end effects" very slightly favor many small tubes over one big one as they need not stick out the full radius of a closing hemisphere but can be a little flatter. Thus, I strongly suspect Opel's Zafira Tourer has many small ID tube in the floor. A "flat tank" with some what more capacity in same space may be the next generation, especially if surface absorption (like on baked corn cobs) is used.


    Billy T had said: "Circular pressure tanks ALL have efficiency 1/4t, independent of their diameter."
    Quote Originally Posted by adoucette View Post
    ... Because while wall thickness scales linearly with diameter, the volume of the gas of a cylinder scales as length times radius squared.

    http://en.wikipedia.org/wiki/Pressure_vessel

    Which means the volume goes up faster than does the diameter which is why, for the same length, larger diameter cylinders are in fact more efficient.

    I showed this by linking to a site with real world pressure tanks, where for the same length tank, volume went up ~130% while diameter went up only ~50% and weight by only ~100%.

    BIG OOPS

    Your tiny 2 cm tubes would not in fact be a good choice for holding CNG.
    They would be like the typical Texan put down, "all hat and no cattle".
    Your's would be "all tank and no gas". ...
    Arthur
    Authur's never admitted error is to forget that the circumference also goes up linearly with diameter.
    Last edited by Billy T; 12-11-11 at 07:34 PM.

  16. #2316
    Their photo of the Combo CNG/Gas fuel system:

    With 4 fuel tanks.

    1 tank for gasoline and 3 very TYPICAL Steel CNG Cylinders. Which are not part of the floor, or in any way shape or form at all like what Billy suspected: Thus, I strongly suspect Opel's Zafira Tourer has many small ID tube in the floor.



    Arthur

  17. #2317
    Please use Sugar Cane Alcohol Billy T's Avatar
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    Quote Originally Posted by adoucette View Post
    Their photo of the Combo CNG/Gas fuel system:

    With 4 fuel tanks. 1 tank for gasoline and 3 very TYPICAL Steel CNG Cylinders. Which are not part of the floor, or in any way shape or form at all like what Billy suspected: Thus, I strongly suspect Opel's Zafira Tourer has many small ID tube in the floor. Arthur
    That is NOT the car I posted about. You are still making irrelevant posts. It is a standard car ADAPTED to CNG by addition of three large CNG tanks - NOT designed from scratch for CNG like one I posted about which DOES HAVE FUEL TANKS IN THE FLOOR.
    Last edited by Billy T; 12-12-11 at 12:30 PM.

  18. #2318
    Why is the rum gone? Trippy's Avatar
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    Quote Originally Posted by Billy T View Post
    That is NOT the car I posted about. You are still making irrelevant posts. It is a standard car ADAPTED to CNG by addition of three large CNG tanks - NOT designed from scratch for CNG like one I posted about which DOES HAVE FUEL TANKS IN THE FLOOR.
    Not according to the Motor industry, Billy.

    According to the Motor industry Arthur is right.

    Here's the Cutaway for the 2012 Opel Zafira Tourer CNG Turbo ecoFlex:

    Source
    Note that it has the tanks in the same place that Arthurs schematic shows them.

    I'm also going to take the time to point out that the Opel Zafira was originally designed to run on Liquid Hydrogen, using a fuel cell, so it was designed, from scratch with compressed/liquid gas as fuel in mind - it even had all of the neccessary paraphenalia for storing the liquid hydrogen at 20k.

  19. #2319
    Please use Sugar Cane Alcohol Billy T's Avatar
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    Quote Originally Posted by Trippy View Post
    Not according to the Motor industry, Billy.

    According to the Motor industry Arthur is right....
    That is probably correct, I was only quoting their text - which said "tanks in the floor." I don't consider the three standard CNG tanks shown in your cut-away to be "tanks in the floor" but do admit they are more integrated into the body, not just stuck inside the trunk as is often done.

    Also the head lights while similar seem to be different - more sweep back in the photo I posted and the "license plates" are not the same - Yours /Author's is not showing the name "Zafira" in your or Author's photo. Even the "flex fuel names" are not the same (One is "Ecotec" the other is "Ecoflex"). Thus, only thing I am completely sure of is both are made by Opel.

    If it is the same car, then I will need to wait a few more years before a commercially available "designed for CNG" car takes advantage of the fact pressure tank efficiency does not depend upon tank diameter so many small ID tanks in the floor can weight the same and hold the same mass of CH4 as one or two bigger ID tanks as well as add rigidity to the floor, lower the CoG, and have less "liquid sloshing" on curves of mountain roads.

    I.e. unit lengths of volume goes as R^2 and of wall mass goes as CT, where C is the circumference and T is the thickness, both of which also go as R so their ratio does not depend upon R the radius.

    I also note that you and Author seem to have different cars from each other. Yours has two identically tanks plus one bigger one and Authors has all three quite different from each other. Your car has an external form, including window shapes, very much like the one in my photo, but Author's has "flat" rear end, not as aerodynamic as the two we show. All These differences make it hard to believe we are speaking of the same car, but it is not very important to me if none have "tanks in the floor" as text I quoted asserted.
    Last edited by Billy T; 12-12-11 at 02:28 PM.

  20. #2320
    Quote Originally Posted by Billy T View Post
    That is probably correct, I was only quoting their text - which said "tanks in the floor." I don't consider the three standard CNG tanks shown in your cut-away to be "tanks in the floor" but do admit they are more integrated into the body, not just stuck inside the trunk as is often done.
    Yes Billy, those tanks are in the floor.

    As opposed to being in the trunk.

    Of course they ARE typical CNG cylinders.

    Nothing at all like you have been suggesting.

    Arthur

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