What would it take to build a cryogenic cooler?

[Naja002]

Now you're an RC pilot....

Last night I went to bed thinking about this issue from another point of view. What's required for a turboexpander to work in a situation like this is predominantly it's size. I had initially investigated the use of small turbochargers for motorcycles having a displacement of 500cc. But I quickly realized the amount of flow through them would simply be too great for any system of this size. So then I thought about my old hobby, radio controlled aircraft. It dawned on me that if turbochargers existed for them, they would be properly suited for this project. So now I submit to all of you the following:
1.) RC turbo charger

2.)
3.) How to Make Turbochargers for Nitro Powered RC Cars

Did you bother to read that thread, Shingoshi? The tubocharger does not work for their application--or as it's claimed. The thread is full of:

Post #9--This is the biggest load of bull I have ever heard... You can't put forced induction on our nitro engines. It is impossible. This is because the exhaust port closes after the intake ports. If you look at the sleeve, you will see that the top of the exhaust port is higher than any other intake ports. Therefore when the piston is reaching the top of the stroke, pressure gained, if any at all, by your so called "turbocharger" would be forced out of the exhaust port. Therefore forced induction does not work on our nitro engines, not even the slightest amount.

Also, by having all of this blowby, you are not only waisting tons of fuel, but you are also eliminating the natural forced induction created by a tuned pipe. A tuned pipe creates backpressure. This is when the exhaust gases reach the end of the pipe and reverberate back to the engine. When an engine is running, some of the fresh air and fuel mixture is expelled out of the exhaust port. What the backpressure does however, is push this air and fuel back into the combustion chamber. Since all of the other ports excluding the exhaust are closed, this creates a natural forced induction. Have you ever wondered why our nitro engines run with much more torque and horsepower with tuned pipes instead of open pipes? This is also why tuned pipes can also be considered "low end" or "high end" pipes. This is mostly due to the shape and length of the pipe which causes the backpressure to be most efficient at different RPM ranges.

And since your "turbocharger" doesn't work and merely heats up your engine, I bet you will go much faster by sticking a nice tuned pipe on it and going back to air cooled.

Fools will always have foolish notions...

Post #26--The RBInnovations supercharger does not in fact "supercharge" RC engines. The extra air that is forced in through the carb merely blows out through the exhuast port as killer89 mentioned before. Therefore when the air and fuel is forced out of the exhaust, you are merely leaning the engine by taking away the fuel and replacing it with air. Therefore, instead of paying $180 for a heap of metal, you can just lean out your engine. Also you have to realize the supercharger is draining HP and torque from the engine by giving extra load to the engine to spin the vanes.

There's nothing positive in that thread.....

Now that we've seen what one would look like, those of you who have the means (metal working materials) should now focus on how to produce one, instead of the constant rants about why this is impossible or implausible. Simply put, start being productive contributors to a working solution, instead of only wanting to detract from one.

Shingoshi

Once again, that's your job. You've not given anybody anything here, except words. Prove your own theories... Buy, build or contract your turboexpander. Here's one that should fit your budget: Turboexpander




Might also want to take the time to read the comments on your "How to make a turbocharger" link.

on 6/20/2007 Where the hell in this article does it tell you how to make a turbocharger for your RC nitro car????????? I am learning disabled and can't read....... or the author needs to let everyone know how to actually MAKE A TURBO, if he/she does not know how to do this, why in gods name are they allowed on a computer as they will surely gum up the keyboard with drool???

How to MAKE Turbochargers:

Things You'll Need:

* RC supercharger
* Nitrous injection mechanism
* Charger heads
* Flywheels of the appropriate size
* Zip ties
* RC fuel line
* RC fuel cell
* Threadlocks

More smoke and mirrors....