PPRuNe Forums - How do I work out weight of M/R/B due to centrifugal force

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Skeeter Pilot

28th Nov 2005 23:27

How do I work out weight of M/R/B due to centrifugal force

Can anyone help with formulas for the following:-

1. I would like to work out the weight of my blades at max. Rrpm when subject to centrifugal force. Don't worry, this is for a large r/c model that I want to fit larger heavier blades to and would just like to make sure that both the blade retaining bolt (one 6mm high tensile cap screw) and the blade grip retaining nut can stand the pace.

2. I would also like to work out the disc loading.

Many thanks,
SP
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Wunper

29th Nov 2005 20:38

SP

Have a cruise round Dave Jackson's web site, I think he has all the bases covered on this page

http://www.unicopter.com/1332.html

Cheers

W:ok:

Fliegenmong

2nd Dec 2005 21:53

SKeeter Pilot

Can you post any pics of this a/c? Dabble a bit ib r/c myself. I will commence the construction of a wattage Turbo Vector ducted fan (electric) soon, though I am sure you are playing well out of my league!!
It would be interesting to calculate such things things

Matthew Parsons

3rd Dec 2005 20:30

The weight of the blade won't change with RPM.

john_tullamarine

4th Dec 2005 10:56

.. but the loads associated with centripetal acceleration will ...

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