Would like your advise on Dynathrust propellers. Good, Bad, or otherwise. To be used on converted weed wacker motors.
Thanks for your help!
Cvan

Dynathrust and Master Airscrew Classic 4 propellers are rather inexpensive composite propellers. They do not perform as well as the higher end propellers but work fine for sport flying. Since a converted weed whacker is a sport engine either will work fine.

My preference is the following:

Size 16 x 6 through 20 x 10, the MAS classic 4 is a better performing propeller because it is stiffer than dynathrust.

Since Master airscrew classic 4 are not made larger than 20 x 10, the only choice in cheaper propellers are dynathrust. I have had good luck with the 22 x 8 and 22 x 10.

Hope this helps

Elson

Thanks for taking the time to reply. Looking at using the 18-8 or 20-6 on the Ryobi's. I'm turning a 16-8 Zinger at 8000 rpm with a slightly modified Ryobi and would like to get the unloaded rpm's down to 7500.
Will be watching for other replies. Any help is appreciated.
Cvan

What do you mean by unloaded rpm?....Thanks john

When running RPM checks on a test stand, or when the plane is restrained, does not indicate the actual RPM's the the motor will be turning when it is in the air. The indicated RPM on a restrained motor is lower. The RPM's that the motor will see in the air will be higher and are known as the "unloaded" RPM's. This is my understanding anyway.

Cvan