After about 10 flights on what was my new Tiger 2, I went out to the flying field on a rather windy day and you guessed it, the wind Won..
The motor survived, the wing took damage in several places(all fixable) the same for the fuselage..
I am wanting to rebuild it into a twin. I ran it with an OS .46 AX it flew great.
What size engines should i put back on it to make a very nice moving twin?

It will really depend on how big a speed freak you are.

Two .25's should give you a little more than the old motor did. It is not because they add up to moe size as much as it is the disc size of the props.

If you fly from a grass field then you wont have to worry about 40/50 class motors on your bird and not being able to sit still at idle.

I learned on the Tiger 2 a long time ago (unless my oldtimers has kicked that is the high wing trainer) and it is a great bird.

If you go with the 40/50 it might not be a bad idea to put flying wires on the tail and that will help to get the CG back when the motors move it forward.

This bird is not going to be a floater any more but that will help you when you get away from trainer style planes anyway

Ground clearance for props will probably be the deciding factor but 25’s should be about right.

Bill

I will have to say that after checking to see what the plane really is as the one I was thinking of was a Carl Goldberg Tiger something but I cant remember what.

I would say to go with the 40/50's and make the nacelles on the upper part of the wing so that the thrust line is close to the way it is now and if you still have a problem with the prop size try a next size smaller diameter three blade.

I have flown the T2 very recently and it is a great aerobatics trainer so go and have a ball as well as more power to you

If you have a computer radio with enough channels when you get used to the T2 then you can mix in the motors to the rudder and try spins and snaps that will be to a new level

I built one a few years ago into a twin and it flew extremely well on two .25's. I put the engines in the closest bay to the fuse that would allow prop clearance and set them with zero down/side thrust. It was so manageable on one engine that you could shoot touch and goes and do all aerobatics on either engine, vertical lines with angle of course. Good luck, you'll love it

Dave

How's this for your answer!

It is a Tiger 2 twin with 2 OS .46AXs. I used it for out thrust and differential power experiments for my column. With 8 degrees out thrust, I would fill one tank 1/3rd full and top off the other. When the one engine quit I couldn't tell the difference except for a speed difference.

I also flew it with 1,000 rpm difference in rpm between the engines and also with 1 TT .46Pro/11-6 and 1 TT .42GP/10-6. With the 8 degrees out thrust (using Ernst thrust plates) I couldn't tell any difference.

Sounds like an out thrust commercial, but that's what I used the plane for. With 2 .46s, it is slightly heavy and lands slightly fast. Nothing overly excessive, but you really can't land any twin like a trainer.

I did have to put the elevator and rudder servo in the rear for balance. No matter what engines you use, build the plane first and use the servos and battery for balance. The 2 .46s will require some rear weight.

I recall I used Hayes 11 oz tanks in the nacelles.

Drop me an e-mail if you'd like more details.