Need to know about thrust angles
 

Ok. So I'm flyin my Pico Tiger Moth And BAM! nose first into the dirt. Busts the motor stick off flush at the cowl. So I hog out the busted stick from the fuse and in the process inlarge the hole to about twice the size as it was. No problem, get a new stick and a
can-o-foam,fill in the hole,cram the new stick in and kinda eyeballed it to where it looked right. (pointed slightly down from horizontal). Back to the park we go, give it a toss. Its flyin but man,I really got to work the stick hard to get any air. So I guess my ? is; Is there a standard formula for calculating thust angles? Or
Is it hit or miss? thx DJ

Need to know about thrust angles
 

The best you can do is an educated guess. Every airplane design is different.

I think you need to get your eyeball recalibrated, as you seem to have missed the proper thrust angle :)