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prop shape needs to be flat on windward side? | 24 comments (24 topical, editorial)
Re: prop shape needs to be flat on windward side? (3.00 / 0) (#3)
by ghurd on Mon May 12th, 2008 at 01:07:50 PM MST
(User Info)

Whats the yellow plastic from?

Figured you used up all those motors by now!
G-



Re: prop shape needs to be flat on windward side? (3.00 / 0) (#4)
by Norm (peppysue@suite224.net) on Mon May 12th, 2008 at 01:55:55 PM MST
(User Info)

Yellow plastic from folders (office supplies
at Dollar General) enough for 2 blades 48 cents
figure dowel rod ....foamboard...hot glue, duct tape
complete windmillwith RT stepper about $2.50 + labor $5...
( I work cheap !)LOL

I may just use a lot of these RT steppers up if
I get these blades working....gotta find out the
angle.

Love those little RT steppers !!
Just to accidentally bump against the prop
and a LED lights up is amazing !
( :>) Norm
[ Parent ]



Re: prop shape needs to be flat on windward side? (3.00 / 0) (#6)
by ghurd on Mon May 12th, 2008 at 03:12:53 PM MST
(User Info)

Mr. Flux can jump in again if he wants.
I am going to butcher this.

Those steppers have a maximum current.
Meaning faster won't make more amps.
The higher speed makes higher HZ (faster AC), and
that makes high resistance in this case.

At some RPM point, the inductance becomes so great,
the amps will not increase.

And for the RT Stepper motors,
that RPM ain't as high as you might think!

Meaning a steep pitch angle would be my first bet.

Those "RT Steppers" are almost all gone.
I figured I'd never be rid of them!
BTW, RT Steppers are not for sale.
G-

[ Parent ]



apology if my enthusiasm has run amuck (3.00 / 0) (#8)
by Norm (peppysue@suite224.net) on Mon May 12th, 2008 at 07:29:52 PM MST
(User Info)

Well sometimes I run mouth before engaging brain
bad habit of mine....wouldn't want anyone to go
swamping you with inquiries about the RT stepper
and I imagine it isn't all that unique just that
a stepper motor when hooked up properly to some
white LEDs are quite impressive.....to young
people...as they barely turn it and it lights up!
  Hope I didn't mislead anyone into thinking that
you can charge really big batteries with one of these
....if they can charge up 10 AA NiCads in
parallel in a 5MPH breeze and it takes all day
or all week just as long as it works.
   So Ghurd please accept my apology if I got
off on the wrong foot with you.
( :>) Norm
[ Parent ]


Re: apology if my enthusiasm has run amuck (3.00 / 0) (#11)
by ghurd on Tue May 13th, 2008 at 07:06:48 AM MST
(User Info)

No, not needed Norm.  
Mine didn't come out right, at all.

Partly avoiding the "I want to go off grid with an RT".

Mostly, I meant they don't have to go too fast
before the amps peak out.  I can't remember how
fast...
Seems like output at 600 and 1200 RPM wasn't much different.
So maybe start with a steep angle.

The little buggers impress me.
I used them for 12V.  Slow, but it worked.
Kept a 12V 7AH enough to charge my cell phone. :-)
G-

[ Parent ]



Thanks back to experimenting (3.00 / 0) (#13)
by Norm (peppysue@suite224.net) on Tue May 13th, 2008 at 08:39:13 AM MST
(User Info)

Trying to find something that works and getting it to work better and looks good too...yet easy to make....these yellow blades will sure look pretty flying in the breeze !

  Well what would you rate one of these at?
a couple of watts? Under ideal conditions...
a close rival to a small solar panel?

 (Trying to keep in mind there are probably other
steppers out there that are maybe just as good
or better than these ...Was just my first introduction to steppers) to be continued)
( :>) Norm
[ Parent ]



Re: Thanks back to experimenting (3.00 / 0) (#14)
by ghurd on Tue May 13th, 2008 at 09:27:52 AM MST
(User Info)

Hehe.  At 12V it was 35~40ma.  So about 1/2W.
They did a lot better amps at lower volts, but still about 1/2 or 2/3 watts.

If you are looking for 6V, I might have something better,  
If I didn't lose it.  Couple hundred ma at 6V, but won't hit 12V.
No fancy tire on it.
G-

[ Parent ]



prop shape needs to be flat on windward side? | 24 comments (24 topical, 0 editorial)

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