Hello folks ,

I need some help here , do somebody know if the down/degrees/firewall of this bird must be corrected to have less down degrees ???

I flew this airplane with a OS 55 AX but I need to say it was so hard to get take off , once on the path when I make full throttle the airplane just inclined the nose to the ground , I would think to move the rod of the gear forward but the airplane has retracts and that is not possible .

The airplane was able to take off only if I gain some speed on the ground very smooth and at the same time pulling it up to avoid again the nose scratching the ground and once with some speed , full up , leave the ground and then full throttle.

The airplane has the CG localized as the manual says.

Now I'm going to put a Surpas .70 with pump but I need to be sure there is the correct degrees of the firewall , to simple eye in my opinion has alot of down , but not sure what is correct .

So the question is ....... do I need to change the firewall degrees ???

If somebody have experiences with it , please let me know .

Either comment will help me , thanks in advance .

Have not heard of this before, but i will check with a pilot on our side of the pond, Brian Cooper, he reviewd it for one of our magazines, he fitted a YS 63