Propeller Thrust Calculator
 

In principle it should be the same for 2-strake and 4-stroke as HP rating is the power the engine delivers under optimum (should that be optimistic?) conditions, while the thrust you get is the actual power delivered when moving air...

In practice you may be right as 2-strokes normally delivers their rated HorsePower at a much higher RPM

Propeller Thrust Calculator
 

ThrustHp shows 25+ for a Mejzlik [email protected]al spring scale test is 17.5....

Getting in a little late here...
 

But I just tached my old Fox .78 with a Master Airscrew 13 x 6 on it today. It ran 9500 rpm's, and pulled just over 7 lbs. of thrust on my brand new fish scale. Thrust HP says it should be 7.29 lbs under those conditions, so that seems pretty close.

I'm wanting to put a little Echo 16cc gasser on this plane with an APC 15 x 8. Think it will perform about the same as my Fox .78? Anyone?

Thanks,

AV8TOR

RE: Propeller Thrust Calculator
 

If you need thrust Calculator go to this website on download page
http://sseamontrealvip.homestead.com.../RcGranby.html

RE: Propeller Thrust Calculator
 

What about this calculator?


http://www.gobrushless.com/testing/t...calculator.php

RE: Propeller Thrust Calculator
 

Somewhere along the way I down loaded a program called "Prop Select". I use it to compute maps of static thrust vs rpm for various prop dia and pitch combinations. I have spotted lots of data reported in these forums on the graph and find the calculated results agree with the reported measured values.
I agree that "Thrust Hp" gives high thrust predictions.

RE: Propeller Thrust Calculator
 

stall angle does certanly not rely on velocity stall angle is a constant 15 degrees between the relative airflow and the chord line</p>

RE: Propeller Thrust Calculator
 

Welcome to RCU Lourensha!

It's not a problem, but are you aware that this was a 5 year old thread that you have awakened?

RE: Propeller Thrust Calculator
 

Not always. some more some much less.

RE: Propeller Thrust Calculator
 

The best spreadsheet that I have seen is the one from Peer Rivers (MVVS): [link=http://mvvs.nl/prop-power-calculator.xls]prop-power-calculator[/link]

RE: Propeller Thrust Calculator
 

Guys...
To those who are interested in predicting actual thrust of a prop kindly browse this thread....

http://www.rcuniverse.com/forum/m_10933735/tm.htm

Well.... i should post it somewhere here, but under gasoline engine forum it feels more like home...

RE: Propeller Thrust Calculator
 

Hi!
A 1,50 four stroke can handle a 16x8 or 17x6 at sea level using 5-15% nitro fuel.
Never ever use a MA prop!!!! Those are the worst possible props to use!

Recommended props for sport flying suitable for most airplanes. All APC, RAM or Graupner Cam-prop!

Cox 0,049. 5x3 or 6x3
OS FP or LA .10 . 7x4 or 7x5.
OS FP or LA .15. 8x4 or 8x5.
OS FP or LA .25. 9x4, 9x5 or 10x4.
OS FP or LA .40. 10x6, 11x4, 11x5 or 11x6.
OS FP or LA .46. 10x7, 11x5,11x6 or 12x4.

ALL .40-.46 Ball bearing engines
like ASP, OS, Enya, TS, Kyosho GX, Super -Tigre, Magnum etc.
9x6, 9x7, 10x6 for Q-500 typ planes 130cm in span weighting 1,6-1,8kg
10x6 ,10x7, 11x6 for low winged sport aerobatic planes.
11x6 or 12x4, 12x5, 12x6 for all high winged or low winged trainers. The last one only for Kyosho GX .40-46 or OS .AX.46...possibly also TT.46 PRO SE

Four strokes!
OS.20 FS 9x6, 10x5.
OS.26 FS 10x5, 10x6, 11x4
OS .30 FS 10x6, 11x4
OS .40 FS 11x6, 12x4
OS .40 Surpass 11x6, 12x4
OS .48 Surpass 11x6, 11x7, 11,5x6, 12x4, 12x5.
OS .52 12x5, 12x6.
OS .90-.91 14x6, 15x4,15x6. 16x4W.
OS .1.20 16x6, 15x8
OS 1.60 16x6, 16x7, 17x6