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Forum Index : Windmills : Nose cones

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robbo

Regular Member

Joined: 25/03/2007
Location: Australia
Posts: 71

Posted: 10:13pm 11 Jul 2008

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Hey everyone.
Just wondering what everybody does for nose cones.
I tend to find/ scrounge things for the mills, but have not found anything shaped well enough for the nose cones.
I've Seen Salad bowls, and tupperware, but nothing ever comes to a point at the end for that wind shaping requirement.

???
Any suggestions.

"the Earth was not given to us, by our fathers, rather, it is lent to us by our children".

Gill

Senior Member

Joined: 11/11/2006
Location: Australia
Posts: 669

Posted: 11:02am 12 Jul 2008

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G'day robbo,
I don't use a nose cone on mine. I seem to recall an article of some time ago that loooked into the importance of the nose cone and found it to be of little if any value and the fitting was for asthetic puroses only.
I can only think the reasoning was, with no nose cone the hub presents a flat surface as opposed to a more rounded one and this merely increases drag which is mast loading.

It seems hard to believe as I feel it would promote a smoother air flow through the blades.

If anyone knows where I may have come across this article, please advise, as I would like to have another look at the argument in support of this view.

was working fine... til the smoke got out.
Cheers Gill _Cairns, FNQ

robbo

Regular Member

Joined: 25/03/2007
Location: Australia
Posts: 71

Posted: 12:23pm 12 Jul 2008

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Thanks Gill.
I believe with the style of hub I use, that the less mast loading on the mill, the better. I generally use a flat aluminium plate as a backing for my prop, in a triangle for three blade, or a hexagon for a 6 blade prop. The larger I make the aluminium plate, the larger the backing for my blades.
Unfortunetly it leaves some area for the breeze to cause a mast loading, as you say.

Was hoping a wider cone would help, as long as it doesn't take any of the root of the blades.

"the Earth was not given to us, by our fathers, rather, it is lent to us by our children".

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