30cc Gas = ???? 4 stroke OR 2 stroke ????
 

I have a 30cc GAS Homelite conversion. What Size of 4 OR 2 stroke engine is comparable to this gas engine??? I have it in an GP super Stearman and just want to make sure its enough power!! Thanks.

RE: 30cc Gas = ???? 4 stroke OR 2 stroke ????
 

My 30CC Homelite with a G23 carb turns a 18-6 in the 7500 to 7600 rpm range.

My Saito 150 turns a 16-8 around 9200.

RE: 30cc Gas = ???? 4 stroke OR 2 stroke ????
 

ST G2300/G3250 or if you want a real beast, OS BGX-1 (4.1 HP at 10,000) and can spin as high as a 20-10![>:]

RE: 30cc Gas = ???? 4 stroke OR 2 stroke ????
 

Hi Tiger,
I think the answer to your question is a average 120 two stroke glow. Of course this depedend a lot on the quality of the conversion. Either way the Homelite is much heavier at about 4 lbs. You will save half a pound in fuel and be able to put the tank on the CG with the Homey. Homelites turn a 18x6 between 7,000 and 8,500 depending on what was done to the engine.

Dave

RE: 30cc Gas = ???? 4 stroke OR 2 stroke ????
 

My Homelite 30cc turns an APC 16 x 8 prop at 9400+ verified with a very good tach. It will hover a 12 lb. plane, even with the 16" prop. Weighs 2 lbs. 12 oz. including mount and prop adapter.

AV8TOR

RE: 30cc Gas = ???? 4 stroke OR 2 stroke ????
 

Hi Av8tor,
I don't think your is tyical. What size glow engine do you think a good Homey is equal to?

Dave

RE: 30cc Gas = ???? 4 stroke OR 2 stroke ????
 

AV8TOR
YOUR HOMILTE IS 2LB 12OZ READY TO FLY????
FARMER TED

RE: 30cc Gas = ???? 4 stroke OR 2 stroke ????
 

Hi,

Yeah, my Homelite is pretty pumped up. It all depends on what you do to them, and I've never run one stock. I always put a larger carb, opened exhaust, leave out the base gasket for more compression and add CH electronic ignition with optimized timing at the very least. Usually I do all the porting, crankcase stuffing etc. as well. I guess a relatively stock motor would be about the equivalent of a 120 two stroke glow....

Yes, I got mine down below 3 lbs. ready to fly, by trimming the crankcase as much as possible, losing the magneto, and using studs to mount the engine instead of the usual back plate mount most people use. I also think my mufflers made of a gutted stocker with two large thinwall brass tubes brazed in for outlets are lighter than the aluminum ones you buy. (about 5 oz.)

Side note: As for other engines, those glass filled rail type motor mounts weigh more than you think. I recently built a GSP Katana with a Kioritz/Echo engine. I made mounts of 1/8" thick aluminum angle. When done, I thought "those mounts look pretty heavy!". So I weighed them and was surprised to find that my aluminum angle mounts weighed 2 oz. less than the stock rail mounts! (That airplane ended up balancing perfectly with no added ballast.)

AV8TOR