Pipe blade stringth.

[Jerry]

I made a set of the normal ZUB-WOOFER pvc pipe blades. I've also made a set of basicly the same blades but with the foam pipe.

I tested both in the wind tunnel on my 8" duel rotor genny. Both blade sets did 30 volts at 11 mph no load. I havn't done the loaded test yet.

I wanted to test the stringth diferance between these 2 plastic pipe blade. So I mounted them horizontily and added weight to the tip. I used a 5lb brick.

The standard PVC pipe blade is abou 1/8" thick. The foam pipe is 5/16" thick.

The skin wall on the foam pipe is less than 1/32" thick with foam between the iner and outer walls. The foam pipe is very strong but at the same time very light.

I'll take a few pictures.

                            Jerry

[Jerry]

I'll be testing these blades under load and compairing the to carved wood and my "Jerry Blades".

These are all 4ft blades tip to tip.

                      Jerry

[fabricator]

Is there a thread somewhere on how these blades are made?

[Jerry]

fabricator try this. http://www.fieldlines.com/story/2007/2/2/41629/53700

I used a Rotozipe with router blade to make the curved slot for the blade root.

The wood triangle is a stack of 3/4" plywood. I'll be trying a 6ft, 8ft and a 10 ft with this build.

                               Jerry

[Chuckrunyan]

Hi Jerry

When you say you will be trying a 10 ft with this build do you mean 10 ft diameter or 10 ft blade length?

Thanks.

Chuck Runyan

[Jerry]

Hi Chuck.

I get this question frequently. Thats why most of the time I use the expresion

tip to tip. Its funny I think I'm the only one that uses that term.

10 ft tip to tip, 5 ft blades or as the Dans would say a 10 footer. Maybe 10 ft turbine?

This may be a good blade for my new 14-11 NEO genny?

                          Jerry

[georgeodjungle]

i use sch40 sdr, better uv resistant. the flexibility is about the same. use it's flex to your advantage to change tsr. i.e. variable pitch blades.

plus at about 40-50mph it starts to act as a brake.

more free power & safer,, ya got ta love that.......

[Norm]

Uh...Jerry ?? 5ft. blades would be 10 ft.

diameter (swept area)...but if you have a

triangular hub...you must have 3 blades and

measuring from one tip to another will be a lot

less than 10 ft. ??

(back to my building battery boxes before you get mad or disgusted with me )

only came in because of a smell of Skunk de Cologne

out in my shed...but now it's raining and

washing the smell away Hooray !