I am building an ultimate 300 biplane. I have asked what engine to use and was told about ys 1.20 or 1.10. I was wondering if anyone has tried a gas engine on it?? what type,size,etc...??? i believe the plane will be around 8-10 lbs.

Thanks

Nino

Before I'd buy an EXPENSIVE (read "YS"), fuel-guzzling glow engine that size, I'd sure take a long, hard look at gas.

Advantages of gas:
Adds free nose weight
Cheaper fuel
No flameouts on long approaches
No constant needle valve tinkering as the temperature and humidity change
No leaning out in tight loops or long climbs
Sounds more scale-like (4 strokes excluded)
The glow driver will never be dead
No worrying about tank placement
No exhaust "slime"

Disadvantages of gas:
Heavier
Slightly less powerful than the same size 2 stroke glow engine
Larger

Need I say more?

Dr.1

Here are a few to look at:

http://www.horizonhobby.com/Products...ProdID=ZENE26A

http://www.horizonhobby.com/Products...rodID=EVOE26GT

But personally, I'd go with a YS 110, The fuel consumption isn't too bad, and it's half the weight of a small gasser.

Do what you can to keep it light and it will be much more fun to fly. I have an YS120 but would recommend an YS110 to save weight.
At least if you want 3D performance.
/PO

I'll bet he's gonna need the nose weight.

Dr.1

IF it's the Carl Goldberg model, then the extra weight may or may not be needed. I recently put together the ARF, and I modified it for dual rear elevator servos. Even with this mod, I came out pretty balanced with a magnum 120 glow engine (app. 3 lb engine). This was with the battery all the way to the firewall. I almost added too much tail weight with the servos, but all worked out ok. The CG is at the back of the recommended range, but I want it aerobatic anyway.

Then again, this plane has such a large balance range, that I suppose it could handle a small gasser. I'd check out Scott Ellingson's conversions before i bought anything. 163 bucks shipped for a 25 CC gasser--which would go perfect in this plane--and that includes muffler, carb, and all. Engine weighs 3 lbs 7 oz RTF. Not a bad deal.

I agree with 2Slow2Matter here. Scott builts a quailty product and his 25cc GT engine would be great for this plane. If 3lbs 7oz is to much weight at $163.00 how does 2lbs 12oz sound at $265.00 with EI. Give Scott Ellingson a try at www.scottellingson.com

thans for the info guys