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>> Home > Forum > Any Other Questions! > PROPELLERS
PROPELLERS
(373 views)
Author Message
RHBaker
(Fleet Admiral!)





Forum Posts: 104
30th Apr 2018 21:16  
>> Permalink
mdlbt.com/41451

Does anybody have any performance charts or operating information for Raboesch propellers?
Am looking for the rpm vs thrust relationship for the under 45m/m 3 blade sizes particularly, but anything would help.
My traditional supplier cannot help and neither does the web site.
Am trying to plan a future models and would like to be rather more scientific than the "if it fits it will work" approach or just using the motor O.D. as a guide to the propeller diameter.

RNinMunich
(Fleet Admiral!)





Forum Posts: 1845
30th Apr 2018 22:08  
>> Permalink
mdlbt.com/41456

Evenin' Rowen, not surprised they don't publish charts, it ain't so easy!
Here's the theory and maths! 😲

https://en.wikipedia.org/wiki/Propeller#Propeller_thrust

happy integrating! Maybe when you're done you can sell them the charts😉
Cheers Doug 😎


Young at heart - slightly older in other places 😉 cheers Doug
Grant me the Serenity to accept things I can't change,
the Courage to change things that I can, and
the Wisdom to know the difference!
RHBaker
(Fleet Admiral!)





Forum Posts: 104
30th Apr 2018 23:07  
>> Permalink
mdlbt.com/41457

Thanks Doug. Always thought, my old mathematics text books would come in useful!
Was hoping for was a simple chart of speed vs thrust, recognizing there are many factors that influence them. Even a max speed and efficiency rating would help.
R

onetenor
(Fleet Admiral!)





Forum Posts: 268
3rd Jun 2018 01:56  
>> Permalink
mdlbt.com/42367

I can only say what I always say. Experiment. A tachometer and a spring balance would be all you should need I think.

RNinMunich
(Fleet Admiral!)





Forum Posts: 1845
3rd Jun 2018 09:05  
>> Permalink
mdlbt.com/42376

I would add the little Wattmeter, which also tells you the max current drawn, to that 'Equipment List' John.
Cheers Doug 😎


Attached Files - Click To View Large


Young at heart - slightly older in other places 😉 cheers Doug
Grant me the Serenity to accept things I can't change,
the Courage to change things that I can, and
the Wisdom to know the difference!