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Single blade madness continued
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7
comments (7 topical, editorial)
Re: Single blade madness continued
(
3.00 / 0
) (
#3
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by johnlm on Thu Feb 10th, 2005 at 05:34:49 PM MST
(
User Info
)
Well It about to get dark and still breeze so I took her down for the night, just in case the wind comes up later tonight. If she's going to vibrate herself to pieces I at least want to see it happening. Tomorrow I will secure the rebar weights a bit better and guy the mast, and maybe bring down some wires from the motor conversion alt. Unfortunately if she starts moving she will run pretty fast as this 5 ft blade was from a prop that did between 500 and 600 RPM in a 10 mph wind (TSR of 10?) Believe it or not when the 5 ft prop got destroyed in a wind storm due to a very poor furling technique (spring loaded tilt back that had the prop/alternator assembly jerking violently in and out of the wind and sinificant blade flutter going on) she was doing a tad over 2000 RPM, and I couldnt stop it by shorting out the 3 phase wires coming down - too high of internal impedance on the alt to stop it.
I learned a lesson from that an have started using the gravity furling tailvane approach. I even built a mechanical shut off system into the furling tail vane on my 8 footer to pull the tail over to the stop and bring the blades 90 degrees out of the wind so I can shut her down in a big blow or if I just dont want it to run. Works nifty.
Johnlm
Single blade madness continued
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7
comments (7 topical, 0 editorial)
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