I'm wondering if there is such a thing as a formula, calculator or table that will show you static thrust (thrust w/ the airplane not moving) for a given prop at a given rpm?

David

There are several calculators
In Scorpion Calc is included a sub-menu

1) You select a prop in a list
2) You select rpm or move a cursor to change rpm
You get
Static thrust in gf or ozinf
Power absorbed by the prop shaft in W

I cannot attach here as RCU doesn't support zip or exe files
But you can find on RC-Groups forum
It is free
<http://www.rcgroups.com/forums/showt...p?t=736782>
Louis

This may be what I was looking for.
Anyone think this calculator makes sense?

[link=http://members.jcom.home.ne.jp/4223215501/staticthrust.htm]Thrust calculator[/link]

Here is a big list of calculators for thrust and other things, both online and downloadable.

[link=http://www.rcgroups.com/forums/showthread.php?t=606703]e-flight calculators[/link]

- Jeff

I have a dualsky brushless setup (4250CA-6T).
I hooked it up and here are some numbers I'm seeing.
I'm using a fluke DC clamp on type current probe (yes a clamp on that measures DC current, not AC).
I"m wondering if I can believe the #'s I'm seeing

11.1V 3 cell LiPo pak
11x8 APC 25A 7500 RPM
12x6 Wood 30A 7800 RPM
14x6 APC 26A 7000 RPM

Do these #'s make sense?

My model would be fine w/ the 11x8 in terms of ground clearance w/ the prop. The 14x6 would chew up the grass unless I get a larger set of landing gear.

David