Hey fellas. I have a 3.3m Yak sitting on the bench. I bought a 200 cc angine to go in it and it is on a superxtra at this time. I am not impressed. I want an engine that will pull this plane out of hover hard at my alt. which is 5200 ft asl. Help a modeler out with your suggestions if you can?

Are you running a 3w 200 in your extra? The 3w 200 is a dog for a 200cc engine. The zdz 210 is a far better choice. I would vote zdz 210 on a set of full length pipes.

3w-157ts. Killer engine and you know you can always fly back for the landing if half the ignition system fails with a twin spark.

SS, he is flying at 5200', so doubt any 150-170 would be enough.

I've recently been flying at a location with a density altitude of 8,800' going up to 15,000 plus in actual flight altitude. Undoubtedly he will lose a few hundred rpm but if he props it right it should do fine. Then again, I don't know how heavy the plane has been assembled.

He does not have many options that would fly the plane well that do not also add more weight to the plane. That's the problem. What would work well but not add too much weight to offset the power gain. ZDZ perhaps? 3W-240 is out of the question.

How about an evo 300 4 cyl (was told smooth vibes)or a 3-w275 (was told vibration levels are too high)? Would it be like overpowering a 1.60 size plane with 50cc gas?,more power and not a horrible trade off in flying characteristics? The Yak needs nose weight and with enough weight up front I could use the front wing setting? maybe? Hate to start experimenting (read as spend a bunch of money) as the 3-W 200cc is having mojor probs. after couple more flights the hub slipped on the shaft. Hate to get another stinker.

Hard to believe, the hub was lapped on the crank and green Loctite was on the joint..Maybe the steel insert slipped inside the the aluminum hub....bring it back sometime, we'll check it out....

Got the ZDZ210 and w/tuned pipes and stuffed it into the 3.1xtra since it has already been wrecked because the previous engine was unreliable. I am not putting anything on the Yak that has not been run succesfully in this one. Lots more power. Still tuning but it ran way better than the other engine. Imagine seven trouble free flights in a row. The tuned pipes take a little getting used to but the pull out is much better. Thanks for the suggestions.

Well, I got the zdz210 tuned pipe length correct. Added 6 inches to headers and now have the power I desire.

I sent the 3-w 200 to Aircraft International and They say that the hub did slip on the shaft causing the timing to be out of specs. There is a bolt stripped in the hub so they say I need to replace the hub. They don't make that hub any more and have went to a larger steel hub. (120$). They say they will go through the engine and it will run right when I get it back.