Hub Part2
By WXYZCIENCE, Section Mechanical Posted on Wed May 31st, 2006 at 06:19:24 AM MST
Pitch Adjustable Hub Update

Here are three pictures of my servo adjustable hub. The blades are attached and they can now rotate 360 degrees. I am now working on a cover and seals for the pivots. It was a lot harder than I first anticipated. The servo is a 24 volt unit and slip rings will be needed to connect the control to it. This is another item that I overlooked. The hard part was getting the blades pivots square. I used shims to align each blade so that they all rotate properly. I will have to make adjustment plates for each blade. My diameter ended up at just over eight feet. I have started working on the genny, a skewed motor conversion (Thanks Zubbly for your input) and will soon post the progress on that end. I took the pics at night. I will try to put it up on the test tower next couple of days and maybe the wind will blow so I can get some data. If not it's on the truck. Joe.

Hub Part2 | 5 comments (5 topical, 0 editorial)

Re: Hub Part2 (3.00 / 0) (#1) by Titantornado on Wed May 31st, 2006 at 04:58:34 AM MST (User Info)

Lookin' good!  Nice to see a theory being put to the test. I wonder if a hub assembly from a wrecked turboprop aircraft could be utilized in some way. Though, I doubt it would be as compact as yours is. Rod

Re: Hub Part2 (3.00 / 0) (#2) by Stonebrain on Thu Jun 1st, 2006 at 06:05:12 AM MST (User Info)

Hi zscience, Good looking,as usual. Did you think about radiographic control of the servomotor. Might be easier than slipcontacts. I don't know anything about electronics,but nowadays allmost anything is radiocontrolled,so me thinking it must be cheap. Just a thought. cheers, stonebrain

Re: Hub Part2 (3.00 / 0) (#3) by Stonebrain on Thu Jun 1st, 2006 at 08:16:02 AM MST (User Info)

I just realize that the problem is rather to feed than to controll the servo. Well,sliprings,no problem for you. cheers, stonebrain [ Parent ]

Re: Hub Part2 (3.00 / 0) (#4) by willib (willibur at comcast dot net) on Fri Jun 2nd, 2006 at 08:52:43 AM MST (User Info) http://www.njwind.com/webcam.html#

you could eliminate the sliprings to power the servo if you used a lower voltage servo (12V) and modified your alt to provide the power . by using coils mounted on the hub spinning against stationary magnets , and using a ultra capacitor to store  power for the servo (also mounted on the hub). this way when its spinning , its charging the cap and  storing power Carpe Ventum (seize the wind)

Re: "Servo picture" (3.00 / 0) (#5) by WXYZCIENCE on Sat Jun 3rd, 2006 at 12:06:03 AM MST (User Info)

The servo that run the pitch unit. I think it comes out of an ice maker. 1.85 rpms 24volt 15 mil amp. The gearing allows the wings to rotate ~6 deg per second. Joe

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