Thursday, October 05, 2006

Bike and 1/2

While driving today I saw a musician and girlfriend riding on a bike and half. It was really fantastic because I had considered the topic previously by about a year and a half and would very much like to design one that runs on hydrogen and a little fuel cell. I recently finished designing the hydrogen powered motorcar, particularly getting 525Hp from a tiny 2-liter uncompressed engine running at 1000RPM. I think I could do very well with a 250ML engine [about the size of a soft drink] two-banger or similar style fuel cell engine, and race all over the place. The hydrogen vehicle probably wouldn't even need the pedals, but I would still incorporate them.

Honda has an interesting 4-stroke cylinder 49cc[ml] engine. I wonder how fast it will get to, and how many mpg it gets. It still burns gasoline so it is bad for the environment and economy.

Hydrogen burns at 325btu/cu'. 1 hp = 2540btu/h. Hydrogen is uncompressed at 10 molecules per cc. 30cm X 30cm X 30cm = 1 square foot. That is 2700cc and 270,000 atoms of hydrogen burning [in one hour] to make 1hp.

If we have a 250ml engine and it is filled with hydrogen running at X [1000] rpm, at 1:1 compression, how many Hp will it produce? 270,000 atoms of hydrogen in one hour is 1hp.

1 RPM is one engineload of hydrogen in one minute. There are 60 minutes in an hour.

If we burn 1 cubic foot of hydrogen [2700cc] 2.7 liters of engine worth of hydrogen per full engine rotation, that will produce 325btu of power uncompressed per cycle. If the engine spins at 1000rpm, it will burn 325,000btu of hydrogen in one minute, and 19,500,000btu/h. 19,500,000btu/h divided by 2540btu/h = 7677.165 hp. This is substantial Hp, and a 2.7 liter engine should not be allowed to run or it would destroy itself.

I need perhaps 100hp. Not 7677Hp. What could I do to reduce the power of this engine? I suppose reducing it to a 270CC engine would be suitable, and would produce 'only' 767.7Hp @ 1000RPM. I could even do a 27CC engine that made 76.77Hp. That is enough for one man on a horse.

According to net speculation, the Kawasaki ZX6 has around 98BHp, X transmission inefficiency. It's a 500 pound bike. The hydrogen one should be substantially lighter, but that is for another engineering project.

I am not sure if regular metal will be able to absorb and use this kind of power intensity repeatedly. It can probably be done, but it will need to be solid product or it'll just warp the iron right off. Maybe a kind of carbon fiber with metal support through it, and a governor of sorts. We could also dilute the hydrogen by increasing the piston size but not the flow. That would reduce psi.

Hmm. 76.77hp might not be enough for a quick bike. We will need to devote 1/3 of the power generated to special electrolysis. Furthermore, the multitronic transmission is estimated 90% efficient for the remaining force. It will require about 25.6Hp of force to produce the energy needed for electrolysis.

...since electrolysis is required for this operation, it would be wiser to run the hydrogen through a fuel cell than convert it back through a large alternator. That project will be acquired once the combustion method and fuel cell stats have been completed.

I recommend a 54CC engine running at 1000RPM producing ~153.54 Hp from uncompressed hydrogen gas. ~50hp of it used for electrolysis, leaving ~100Hp for the drivetrain. A multitronic transmission estimated 90% efficient putting 90Hp on the road.

Since the engine is so tiny and the amount of fuel is at the level of drops not liters, I estimate this bike will weigh not more than 300 pounds. I don't care about the mpg for this feature. It is probably numerous times more efficient than the 525hp engine [which must be corrected far upwards for HP-BTU translation.]

Now, the fuel cell. I am not totally sure how to go about doing this. I could probably figure how many jourles of energy a fuel cell produced per reaction. I water splitter attached to a fuel cell would be a FANTASTIC journey. I could attach the fuel cell to a series of brushless dynamos and take any vehicle spinning for about a billion hours. I mean, quintillion.

1 Hp of power equals 0.746 KW of power. 1 watt = 1 joule per second.


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