Tilting engine down by 3° was factory recommendation for 100 HP engine. 50 hp engine was installed in line with chord line. They provide little blueprint for how to do it with engine bracket. This was their way to achieve self balancing or a self triming effect. Higher RPM was providing more down pressure on horizontal stabilizer. I tried that as well, but discovered that flexible 120 mm tailboom wasn't tolerating this very well and control stick was dancing in my hand. From what we know today almost all airplanes with 912 engines were shipped to this country with engine tilted up by 3° versus down because of that.
However from what I understand this is the right thing to do for pusher arrangements like this. New tail boom will be much stronger and I will tilt engine down just like it shows below.
Wondering if this will increase P factor effect or decrease it?