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| Title: | Welcome To The Radio Control Conference |
| Notice: | dir's in 11, who's who in 4, sales in 6, auctions 19 |
| Moderator: | VMSSG::FRIEDRICHS |
|
| Created: | Tue Jan 13 1987 |
| Last Modified: | Thu Jun 05 1997 |
| Last Successful Update: | Fri Jun 06 1997 |
| Number of topics: | 1706 |
| Total number of notes: | 27193 |
1231.0. "CO2 power?" by USRCV1::BLUMJ () Mon Jul 16 1990 14:02
This past weekend, I attended the FF Rubber Scale NATS, held in
Geneseo, NY. One contestant had a CO2 powered scale Biplane with
a wingspan of approx. 36"-40" and an allup weight of 2 lbs. He
claimed the plane flew very well with a 40cc tank, with run times
around 1:30. I am in the procerss of building my first electric
powered sailplane(Graupner UHU) and was wondering why a 2-meter
size sailplane could not employ CO2 power. The run time of my
UHU with 7 cell pack should be about 2min 20sec. This fellow
claimed the weight of the CO2 system was 3 oz. and with a recharge
time of 3 seconds versus 30 minutes for electric it seems like it
might be an excellent method for launching a sailplane. Does anyone
have anye experience with CO2 powered planes?
Regards,
Jim
| T.R | Title | User | Personal
Name | Date | Lines |
|---|
| 1231.1 | It could work | WILKIE::SWEENEY | | Tue Jul 31 1990 14:41 | 22 |
| It sounds like it was an .049 conversion. I think you could
get more info from Peck Polymers. As long as you used a large folding
prop you could probably be sucessful. It would have to be mounted on
the nose to clear the prop. C02 engines are torque intensive. An .049
can spin a 9 or 10 inch prop to good advantage. The RPM is low but the
net thrust is similar to what would be produced by a reduction set-up.
The power to to weight ratio of CO2 systems is quite good around
the same as low to medium performance combustion engines. In the case
of your two meter project you might find it is a good idea to use a
standard CO2 cartridge as the tank. It would make for a consistent run
and I beleive the size would give one really spectacular launch.
In a recent British publication I saw an article about a fancy
compressed air powerplant. I use the word fancy because it had a
regulator that made the motor run at a constant speed in spite of
diminishing pressure. It used a tank that looked like a soda bottle.
It was charged to about 150psi using a bicycle pump. It had a run
of over a minute and was 90% plastic construction.
Good luck in your quest and feel free to contact me on or off line
if I can be of help.
Terry Sweeney
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