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HelicopterGasser Model RC HelicoptersOther › Gasser's and inverted flight
06-03-2004 04:32 AM  13 years agoPost 1
Ts8103

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Baltimore, Maryland

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I read somewhere here that gasser's do not need a header tank. If this is true how do you sustain inverted flight for 3D? How long can you hover inverted before the engine hiccups.
Thanks,
Tone

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06-03-2004 05:27 AM  13 years agoPost 2
Wally

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San Diego, CA

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The gasser carb has it's own internal pump...

It'll suck gas all day long, even if the tank is several feet away.

The Big Wally

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06-03-2004 05:31 AM  13 years agoPost 3
hoverking

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Tennessee

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i guess you have not seen curtis fly the pred gasser, i have never seen a gasser fly like that ill try to find the video

chris

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06-03-2004 05:34 AM  13 years agoPost 4
Naomi

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Ontario, Canada

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06-03-2004 06:23 AM  13 years agoPost 5
Malorie

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Paw squared, MI

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You only need to run a standard clunk setup on the gas machines. The gassers don't use fuel at a very fast rate. They also have a pump and a small resevoir in the carb. If the feed line gets air for a few seconds, no big deal, the pump just plays catchup.

I've flown mine inverted for the better part of 30 minutes before. As long as your clunk works, you're golden.

Life's a journey, NOT a destination.

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06-03-2004 08:03 PM  13 years agoPost 6
helidog

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usa

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I have tested (fuel draw) from as far away as 60" with no engine problems, I would still mount the fuel tank as close to the engine as possible, This just give you and idea of what the fuel system can do.

I forgot to mention that the test was on a bench and the fuel was being drawn from the ground up to the test stand. You have other factors when the engine is mounted and in use in a heli. “ barometric pressures ” being one of them

Just make sure the fuel tank is vented so there will be no differential pressure on the tank during flight. You will find that with a closed loop fuel system( NITRO ENGINE) the tank will experience negative and positive pressures this is why nitro heli tanks are under pressure throughout the duration of the flight to keep the engine running consistent during the pressure changes on the tank.

With a pump carburetor you don’t have the sever problem because it is pumping the fuel to the carb not drawing it from vacuum.

Like Malorie had said "inverted for 30 min"

The engine doesn’t care what attitude it is sitting at just as long as it can get fuel to the carb Also when a nitro engine hiccups a lot of time you will see the engine die. When a Gas engine hiccups it will regain and keep on running.
Reason for this is, When a nitro engine burps it losses vacuum (needed to suck fuel from the tank to the carb) and also looses tank pressure (needed to push fuel to the carb and keep tank at a constant pressure) needed to supply the carburetor with fuel. Now you have a (FLAME OUT).

When a gas engine burps, (with a pump carburetor) there is still sufficient vacuum supplied by the engine to keep the pump working and keep fuel at the carburetor.

One other thing you have to consider it’s the gas engine has a flywheel, the flywheel is stored energy and will keep the engine turning through the split second that counts most (during the hiccup) the rotating mass of the engine and flywheel will keep the engine turning it also makes its own spark to detonate the fuel so if you can get one revolution on the engine, most of the time that’s all it take to keep a gas engine running.

A nitro engine doesn’t have the stored energy or the ignition to keep it going in the hiccup scenario.

I hope this explains it a little for you

Its nice to be the Big Dog.

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06-04-2004 01:52 AM  13 years agoPost 7
Ts8103

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Baltimore, Maryland

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Thanks alot for the info. I was worried about being low on fuel and flying inverted. I know that a glow engine is does not matter because of the header tank, but I wasn't sure about the gasser.
Tone

Team Outrage
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06-04-2004 11:55 AM  13 years agoPost 8
Malorie

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Paw squared, MI

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As long as your clunk is in the fuel, no worries.

Life's a journey, NOT a destination.

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08-02-2004 09:42 AM  13 years agoPost 9
Ralf P

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Munich, Germany

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any second source for the CY Video, the link doesn`t work (no access to the FTP),

thanks

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08-02-2004 09:46 AM  13 years agoPost 10
Ralf P

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Munich, Germany

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o.k, i found it on the augustoheli,com

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08-02-2004 05:51 PM  13 years agoPost 11
ddang

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Corona, CA

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the link to the video not working. someone post a new one please. I like to see it

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08-02-2004 06:12 PM  13 years agoPost 12
Naomi

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Ontario, Canada

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Try this one.. it should work now.

http://runryder.com/helicopter/gall...Mayday_2004.zip

Naomi

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08-02-2004 06:12 PM  13 years agoPost 13
sabooo

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Allentown, PA area

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08-02-2004 08:22 PM  13 years agoPost 14
iluvtoflyrc

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Lincoln Nebraska

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