G'day

I used to have an OS 19 (a long time ago) and I had a 9 x 6 on it. That would give you a bit more thrust.

I think the 20 should fly the plane but it would not be a powerhouse and flying a model which is at the low end of the recommended engine size does require some finesse. You have to coax it into the air and not try to haul it up. It should fly its self off when it is ready but you will probably had to give it just a tiny bit of up elevator to get it to rotate and head up.

Now having said all this - I strongly suggest you find an instructor. If you do not. It s about 98.3% certain that your first flight will be (1) short, (2) dramatic and (3) result in the demise of the plane (and possibly the engine if you are near tarmac). It is really worth while getting someone to help you. Not only with the flying but also to check out the plane to make sure everything is OK. It is very easy to get something wrong when you are starting out.

I have had two planes the just would not fly. Both were underpowered. One was an oldtimer Simplex and all it wanted to do was stay on the ground. I think it was afraid of heights. The other was (actually still is) a very old Sig Kadet Senior into which I put a very old Saito 45. The little Saito ran perfectly but just could haul the Kadet into the air. A similar aged OS 40 four stroke could get it into the air. Just. It would then climb like a WWII bomber with a full bomb and fuel load. Very gradually.

Have fun with your model. We need more blokes your age in the hobby. It is possible to teach your self to fly but it will cost you several models. Better to find the bods at that club and get them to help you. I am sure they will.

Cheers

Mike in Oz