Nice Project Dave, I have no knowlage of the Gyro system at all. I have my hands full flying planes with wings. Anyway my bee is flying well on the 8x4 wood prop. I did try the 7x4 but it didnt have enough thrust, especially in the wind. I'm going to try a Master Airscrew 8x4 it may spin faster than the wooden Zinger. My LHS said to try a 7x8 APC and gave me one free to try. I think they are nuts. I will try it, I have been in boats for more than 20 years and props always take a lot of trial and error even with identical boats. As for my Bee I am happy with it and the Fox 15, I'm just looking for the sweet spot. One bit of trouble I'm having is just below a 1/2 tank of fuel I will get bubbles in the fuel line and sparratic run out. When I built it I wraped the tank in foam to prevent this. I may have to live with it I dont know what to do just yet. It is difficult at best to get to the tank with my XL hands. also I mounted it up as far as I could to keep the fuel draw as easy as possible The top of the tank is against wood and the bottom and sides have the foam. Maybe thats what my problem is? Maybe someday I will take out the tank and get foam all the way around it, I only did that for the fuel delivery [keeping the tank elevated as much as poss.]
I'll stop rambling. Good luck with your project, show us a completed picture k
Keester