i am in the process of building a super sportster 60 and am torn between putting a 4 stroke or a 2 stroke in it so im looking for opinions and or recomendations for this plane please. Looking for it to haul butt and be acrobatic
thank you Rich

I used a 2 stroke OS 61 FX in mine, it was a real screamer. Had great vert as well. Would do great aerobatics but not 3D. The Sportster is a great low wing trainer and semi-scale plane. Your going to enjoy it!

I use a Webra Speed Schnurle .61 with a pipe and retracts on mine. Faster than heck and unlimited vert. Personally, I wouldn't waste time with a 4 stroke, but that is just me.

I put an ST.75 in mine. Unlimited verticle and rediculously wide flight envelope. Flys real slow on the wing, or screams by. I beefed mine up with a spar joiner and glass on the center section. And moved the wheels onto the fuse just forward of the LE. Been flying great about 9 years. Tough bird.
Edwin

Well, if you're looking for aerobatics, I'd always go for a four stroke. The torque is great when looking for vertical in manuevers (much better than any two stroke).

If you're looking for speed (haulin' butt), then go with a strong two stroke.

Either way, prop choice will play a major role in what the engine will give you. Smaller diameter, higher pitch for speed; larger diameter, smaller pitch for torque (and vertical grunt).
Dennis-

Dennis is giving you sound advice. Let me add my two cents to what he already posted.

No plane does it all. If you want fast, get something with a thin wing and prop it with a high pitch small diameter prop for rpm and top end performance. What you have in the Sportser is a sport plane/aerobatic (not acrobatic) trainer. I would set it up to fly the way it was designed to be flown, with a wide flight envelope but not a speedster. Flyboy's pipe seems like a waste to me and I'd go with a fourstroke for vertical performance. I'd prop it with the larger diameter lower pitch props of the recommended range and enjoy slower smoother flight while practicing basic aerobatic manuevers. If you want to zip around a bit switch to the speedier prop but use the plane for it's intended purpose and you'll enjoy it more.

Mine has a TT Pro .61 in it, but I wish I had put a Saito .91 in it. With the engine upright and all exposed, it would look much better, and the sound cannot be compared. I just think this is one airframe that could really showcase a beautiful engine. If you have the few extra bucks, go for the 4-stroke.

Pilgrim

Why not get two motor mounts with the same fire wall hole pattern--put a hot 60 on one & a good 91 FS on the other. Try both--see which one you like--can't be all that hard to switch out motors . Just make sure you re-balance. I bought a slighty used TT 61 for $50.00 ,so there are bargins out there. There is a ton of engines in the Market place forum in RCU --check em out --Good Luck ---

The engine compartment on this plane is pretty tight, and you will more than likely have to build it to the exact engine you choose. My TT .61 barely fit between the balsa cowl sides without having to carve out the inside walls. You'll have to make access for the needle valve and exhaust etc, so it's not that feasible to switch between two different engines.

The TT .61 is a little on the heavy side compared to others, but I only had to add 1/2 oz of lead to tail for balance. I think the Saito .91 is pretty light, so you shouldn't have a balance problem.

Pilgrim

Here is a picture of mine with a Saito.91 shoehorned in at about the 8:00 position. No pump, no problems, unlimited vertical with a 14x6 APC, 15% Red Max, 1870 elevation. This is a nice setup, but of course I had to do it the hard way. Weigh: 6 pounds.

So whzyrd, what did you decide? Got any pics?

Jerry

Thanks for all the ideas im still in the building stage i just finsihed 3 straight weeks of doubles at work so the plane has just been sitting I havent decided on a power plant yet but as soon as i do ill post thank you all again very much for you ideas what a great bunch of people here (bow)
Rich