View Single Post
Old 08-06-2020, 08:16 AM
  #47143  
Hyjinx
 
Join Date: Dec 2015
Posts: 365
Received 5 Likes on 5 Posts
Default

Originally Posted by Glowgeek View Post
The problem is that the 9 " prop pitch is too high, it's dragging down an engine that makes peak torque at somewhere around 8200 rpm and peak hp at well over 11k.

With the Xoar 12x9 at 7000 rpm you are making only 2.88 lbs of thrust and .46 hp. Put a 12x7 on that same engine and you'll be making 5.31 lbs of thrust and .896 hp at 9300 rpm richened for flight.

Refer to bottom graph:




Hope this helps in some way.

Lonnie
Helps in a big way Lonnie. Thanks.
I knew one of you guys would pick up on that quick and make some suggestions I wouldn't have to research myself LOL.
I usually just use props that bring my Saitos to between 8500 and 9000 tops.
If that won't fly it I usually take a bigger Saito off the shelf and bolt It on.
I just don't like to sound they produce above that and conservative rpms make em last longer.
Just opinion there, just me.
Thanks Lon