Blades for an Ametek?

[Roman]

I'm looking into getting an Ametek 24v motor (it's about 7in long) and was just wondering aproximately what size blades I would need.  If anyone had links or info on making blades of that size I'd certainly appreciate it.

Also, will I need to weather-proof the motor somehow or is it already sealed?

Thanks!

[Jerry]

These work quite well.

I wrape the motor in aluminum foil ducted tape used for heating air ducts. It won't rust and its fast. Also kinda shiny. I sell these blades without the hub for $15 each.

                       JK TAS Jerry

[CntrlAltDel]

This company has many products and info for Amtek.

I have never had any dealings with them.

http://www.tlgwindpower.com/

They also list all of Amtek's motors and if they are sutable for wind gennies.

[Roman]

I was really looking for info on making my own blades, but those look very nice.  Just out of curiousity do you sell hub assemblies as well?  $15/blade sounds like a good deal but shipping to Canada might be costly.

With an average amount of wind (it gets pretty windy here at times in Nova Scotia) would a target of 350rpm be out of the question?

[Jerry]

Hi Roman.

The blades are very light. About 9 OZ. each. This would be around than 2 LBs after packageing. A very thin pkg. also. I ship by USPS. to Canada. I don't think it woud be all that bad for shipping.

I do sell a 3 and 4 blade metal hub. Thats the expencive part $50. You also need to make aluminum sheet metal supports at the root and extend 5 inches towards the tip.

I sell these supports at $5 per pair. 1 pair per blade requiered. A set of screw hardware is $5.

I also use #10 stainless steel machine screws, large flat washers, lock washers and nuts to hold this sandwich together.

Without this root support the blades will break. With the supports the blades have with stood 80 MPH+ winds in northern Youkon teritory.

I've wind tested them to 68 mph in my wind test truck.

Many folks have built there own hubs and supports. If you can do this from scratch this make these blades very cheap.

In terms of rpm I have no hard data yet. I do know they've spun a GM car alternater to 405 watts direct mounted.

In a recent F&P test I calculated from both lathe power and the a windpower test that at 15 mph the blades were spining at aprox. 415 rpm. This was 10 amps. This could be higher or lower rpm depending on the size and type of generater?

I'll post a chart I wrote out by hand that compairs ten diferant gennies I own and fly. 2 of these gennies are comercial unit the rest are all home built with my plastic blades.

I think I'll post a new post of this for all to see. thanks for the idea.

                         JK TAS Jerry

                       JK TAS Jerry