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Perry

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Joined: 19/11/2009
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Posts: 190

Posted: 11:38pm 06 Dec 2009

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Hello,
Time to put away the calculator and cut some fingers.

I have a small Ametek 30 based test turbine that I play around with. Various blade testing and data aq test bed. Had it up to 70 watts so far with my feeble wind site. (on ebay that means I would have to list it as a 1000 W max output turbine ---very small text----rated at 250 mph)

I have used various blades from TLG's to homemade PVC, to some ebay Hornet clones. I think it is time to carve some wood ones to see what all the hoopla is about.

I was thinking that Hugh's 4 ft design would be good for this motor, with a cut in of about 400 rpm.

So some questions for the experts.

1.) I have both Hugh's book and the Danseses (that's a hard word to pluralize) book. Their recipe is slightly different. Any thoughts as to which is best?

2) Can this blade perform well in lower winds? I realize there isn't much power there but can I make it to cut-in during gusts of say 10 mph?

Here's a test one I made last night from Hughes plans. It was great fun and I felt like some guy carving an airplane propeller 100 years ago.

Perry

KarlJ

Guru

Joined: 19/05/2008
Location: Australia
Posts: 1178

Posted: 01:22am 07 Dec 2009

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VERY nice, well done, just make a few more like it...

Luck favours the well prepared

Downwind

Guru

Joined: 09/09/2009
Location: Australia
Posts: 2333

Posted: 04:39am 07 Dec 2009

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It might be a bit hard to balance with one blade.
Just kidding.
Nice work
It looks like a bought one.
I will leave the question asked to the experts.

Pete.

Sometimes it just works

Perry

Senior Member

Joined: 19/11/2009
Location:
Posts: 190

Posted: 05:32am 07 Dec 2009

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A little blur and bad lighting can make anything look good from a distance. Same strategy I use for online dating.

Honestly it turned out pretty good if I do say so myself. I know it pales in comparison to you guys that have carved a 10 ft blade but you always remember the first one you made.

Perry

oztules

Guru

Joined: 26/07/2007
Location: Australia
Posts: 1686

Posted: 08:04am 07 Dec 2009

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Looks ideal for an axial flux.

I suspect that a constant chord, or wider tip version may help with that style of motor.... but that is without experience of the ameteks.

nice job

.........oztules

Village idiot...or... just another hack out of his depth

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