I'm test flying

[David HK]

I finished my Piggot two foot radius blades and had them flying today albeit in wood sealant condition.

What a surprise aerofoils are. And the speed and acceleration they produce. I did not think such small blades could be so powerful.And the rpm's - the prop just becomes a whizzing blurr.

Tomorrow the assembly comes to pieces for smoothing and rub down and then a white paint overall with red bands.

After that reassembly and balancing.

Then on to a roof mount which needs some thinking about for design arrangements.

And then onto what I can power with it. I have an Ametek 30 volt DC motor to play with, but it needs an awful lot of rpm to achieve anything over 12 volts. Perhaps some of you clever people may have ideas and could describe to me a DC motor that would be suitable for battery charging (12 volt system). I am hoping to avoid the Piggot 12 volt design-and-build unless I am pushed.

A great day!

Regards,

David HK

[coldspot]

How about some pictures?

So you just test flown without being on a gen?

"Ametek 30 volt DC"

I also have one being flown wrong with ceiling fan blades

But it does get above 12 volts often, I even saw 20+ the other day

so I hooked it to a small watercraft battery and saw 12.05 up to 12.87

in some 15+ MPH winds.

I'll carve some blades one day.

lol

[Norm]

  Wrap a nylon string around a cylinder that is

connected to the shaft of the Ametek connected

to the battery....adjust the weight(add water to

the milk jug) until the Ametek is charging the

battery from this you can determine how many Ft.

lbs. per min.

  Next...make a simple Prony brake to use on

your HAWT. which will give you a good idea what

you will need...

  Here's another thought...there seems to be a

mindset on 12 volts....depending on the circum-

stances...but you could try charging a 6 volt

battery close to the mill...slip rings or the

battery attached to the mill....small swing down

tower or pole to access the battery conveniently.

                  ( :>) Norm.