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Maximum tsr
By Devo, Section Wind Posted on Wed Nov 02, 2005 at 01:52:55 AM MST
4 foot spruce blades

I have a bunch of motors I want to make props for , 4 foot props seem to have more than enough power to turn these motors but I want to increase the tsr so I can get
the maximum output out of these motors , when I go smaller than 4 I get the rpm up but stalling is an issue.
I am making a set at 8.5 but I am wondering if anyone has found a point on a 4 foot prop that you should cross because they fly apart?
Could I go to tsr of 10? this would put me in the range I want , if not I will go bigger prop & gear it up a bit.
Thanks
Devo

Maximum tsr | 3 comments (3 topical)

Re: Maximum tsr (3.00 / 0) (#1)
by windstuffnow on Tue Nov 01, 2005 at 08:02:44 PM MST

Devo, sounds like some fun projects you have there! I don't think you'll have any problems running a 4ft set at a TSR of 8 or above. I've found that the faster you make them to run the more likely their going to make noise in higher winds. ( Like the 403's ) In order to get to run that fast you really have to take your time making them, nice airfoil and very thin. Use quality wood as well and a good balancing is a must. Remember the faster they spin the more dangerous they become if anything should happen.

.
Have Fun! Windstuff Ed

Re: Maximum tsr (3.00 / 0) (#2)
by Devo on Wed Nov 02, 2005 at 03:14:35 AM MST

Thanks Ed , I will try a 10 or 12 & see if they hold together.

Devo

Re: Maximum tsr (3.00 / 0) (#3)
by Flux on Wed Nov 02, 2005 at 03:23:39 AM MST

Ed is right, noise will be the limiting factor. I wouldn't make the centre part excessively wide if you want maximum speed. I would aim for tsr 10 at the outer part and keep the width and pitch constant on the inner part. For very high speed on a small prop 2 blade might be better as you can use one piece of timber. There will be vibration during yaw but the noise will be the worst problem. 1500 rpm should be easy to obtain at 4 ft.

Flux

[ Parent ]

Maximum tsr | 3 comments (3 topical)

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