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HomeRC & PowerAircraftHelicopterEngines Plugs Mufflers Fuel › A question about these new gas engines
10-22-2014 04:12 AM  4 years agoPost 1
FenderBean

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Fort Hood TX

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I was looking at these new OS gas engines that look like a 2 stroke engine and was wondering how they perform? I have been flying nitro for over 25 years, not a fan of large 90 size electric. Depending on how they run I thought it might be a time switch to gas. I noticed they run electronic ignitions so it will need a isolator, I would probably use one like in my plane, it allows u to use the receiver battery to power it. So whats up do they perform like a 2 stroke or do they perform like the older gas engines? Do they have more vibration like the older ones? I always had gyro issues with gas that was probably my biggest problem and the mind numbing sound
Thanks

http://www3.towerhobbies.com/cgi-bi...p?&I=LXCZAT&P=0

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10-22-2014 05:22 AM  4 years agoPost 2
don s

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Chesapeake, VA

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Power is lower than a nitro of identical displacement.

E820, Raptor G4N, X50F/E, E620, Forza 450, and some planks.

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10-22-2014 05:40 AM  4 years agoPost 3
FenderBean

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Fort Hood TX

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Bummer

https://www.youtube.com/channel/UCE_rywpdgBAxA8bHVCw3VQQ

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10-22-2014 02:28 PM  4 years agoPost 4
don s

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Chesapeake, VA

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700s with the GT15HZ are good for sport flying.

An Align 600 conversion for the GT15HZ-600 is out there.

E820, Raptor G4N, X50F/E, E620, Forza 450, and some planks.

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10-22-2014 03:31 PM  4 years agoPost 5
Rafael23cc

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Junction City, KS

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don s
Power is lower than a nitro of identical displacement.
That should not be a surprise to anybody that has been in the hobby for any number of years, specially if you have gas experience either fixed wing or rotary.

Now, just as you say, a big block conversion on a 50 sized machine, would be a good place for them. Last weekend I saw a Helibug converted TRex 700 but running 600 blades and boom. It was actually smaller than a Synergy N5 that belonged to the same owner.

Rafael

Keep your feet on the ground, but your eyes on the sky.
Team Heliproz.com

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10-22-2014 03:32 PM  4 years agoPost 6
rexxigpilot

rrProfessor

Florida

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Check out some of the videos of gas powered RC helis on the web. I think you will find the performance more than adequate.

Here's one of Bobby Watts flying a modified Fury 55. I've seen some vids of a TRex 700 with the GT15HZ that are even better. Many are of the opinion that you should put this engine in a 600 class heli. I disagree. The gas engine weighs too much for a 600. A gas engine will also typically have less HP but more torque than its nitro engine counterpart. This extra torque can be used more beneficially with larger blades of a 700 at a slightly lower head speed.

Watch at YouTube

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10-22-2014 05:59 PM  4 years agoPost 7
Four Stroker

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Atlanta

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If this spec is accurate: Output: 2.76 hp @ 14,000 rpm

Then a TREX 700N with this engine has a better power to weight ratio than any of the old 60 helicopters - about 2.2 hp. So by sport flying I assume we mean NOT crack smack maniac 3D. You might want to run slightly smaller blades if they exists - 680's AND LHS, say 1700.

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