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Old 12-19-2008, 08:35 AM   #1
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Red face Engine Choice....comments please

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Hi All,

I have bought a YAK with a 70" wingspan. Looking forward to getting this bird into the air, but I am in limbo about engine choice.
I was hell bent on getting into Gas, either a 26cc or 28cc, but I am also looking at getting
a simple 2 stroke OS 160. I can see that the power to weight ratio on the 160 is superior to the gasser. I have had experience with Nitro but not with gas.


Does the 2 stroke have reliable and adequate throttle response to have decent 3D capability?

Is a relative cheap Chinese YAK going to fall apart from the vibration of the gasser?

Can I get away with "lesser" servos on the 2 stroke because vibration is not an issue?

Is it recommended or necessary to use a pump on the OS 160? I have had no experience
with a Perry Pump.

I won't fly this plane as often as my smaller ones, so nitro cost is not really a deciding factor. Can anyone tell me of their experiences with either or both options.
I am a firm believer that too much power is a good thing, and I am concerned that the gasser won't have decent enough grunt to pull the bird out of a hover with ease.
I know that Nitro is messy, but I see that gas also requires a wipedown afterward. Most people say that Gas is so clean, but I think that this is an exagerration. From what I have seen, gassers still make a mess. I know that me lawnmower does!

Any comments wold be much appreciated.


Last edited by NewGuy; 12-19-2008 at 08:44 AM. Reason: Added one sentence.
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Old 12-19-2008, 08:54 AM   #2
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Re: Engine Choice....comments please

I put the 160 in a friends giant U-Can_Do and it has gobs of power. Uses gobs of fuel, and needed a perry pump for all that 3D stuff. The pump makes the engine ultra reliable. The needle valve had to go in quite a bit with the pump.
The 160 is lot of motor for a 70 inch plane. Weight is every thing if you want to dance 3D.
Bill Green 18250
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Old 12-24-2008, 08:29 AM   #3
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Smile Re: Engine Choice....comments please

Thanks Bill,

Anyone else got some input? Would be much appreciated...
Bill and I can't be the only 2 guys that have been considering possibilities like this.
I am interested in opinions about the vibration and servos.

Merry Christmas and Happy New Year to you all.


Last edited by NewGuy; 12-24-2008 at 08:33 AM.
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