Hi

Need some help here.

Came across this useful utility called ThrustHP.
I've this Saito 72 running with APC 13x7 @ 9400rpm.

According to Thrust HP, the prop speed is approx 62mph.
Horsepower is approx 1.7hp. Static Thrust is 10.6lb.

I realised that unlike jet engine, the thrust will be lower as the
airspeed increases. Infact, the thrust 'decays' slowly.

1) For my case, will the thrust decay to zero as the airspeed increased to 62mph (assuming my RPM is still 9400rpm ....)

2) If the thrust has decayed, are there any ways to determine the actual
thrust during forward flight?

3) Assuming I have a plane that flies at 60mph.
The total drag experienced @60mph is approx 10lbs.
Would this Saito 72 setup be suitable?
What kind of setup will be useful?


Any help will be useful!
Thanks!

You're thinking too hard. Use an engine in recommended range, try various propellers (in flight) and choose which one you like best.