Re: Another improved propeller gap

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Brian by way of Terry Fritz <teslalist-at-qwest-dot-net>" <ka1bbg-at-webryders-dot-net>

Hi, before we all go out and buy kevlar fibre, part of the reason it stops
bullets etc is the way it is woven,layered,contained and sewed together. it
might look simple but there is black science there, just not as simple as it
looks. still worth a try, anything for some safety is good. cul brian f.
----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Friday, January 31, 2003 9:22 PM
Subject: Re: Another improved propeller gap


 > Original poster: "Terrell W. Fritz by way of Terry Fritz
<teslalist-at-qwest-dot-net>" <terrellf-at-qwest-dot-net>
 >
 > Hi Bob,
 >
 > Gosh!!  I was going to order some other stuff from McMaster Carr, so maybe
 > I should get a few yards of kevlar just to play with.  I think it can be
 > worked like fiberglass and epoxy resin.  It is supposed to be rough on the
 > hands and such...  They also make phenolics with kevlar as the binder, but
 > never have seen it for non-military "public" sale.  Make a darn strong
 > rotor ;-))  I think you need special shears (or cheap ones) to cut the
 > stuff too...  Sounds like a single layer would stop anything a gap could
 > shoot out...
 >
 > Cheers,
 >
 > Terry
 >
 >
 > At 05:01 PM 1/31/2003 -0700, you wrote:
 >  >Original poster: "bob by way of Terry Fritz <teslalist-at-qwest-dot-net>"
 >  ><yubba-at-clara-dot-net>
 >  >
 >  >hi terry,Steve
 >  >
 >  >kevlar blankets are used on tractor pulling rigs to catch the clutch as
it
 >  >disintegrates under the strain of 4000 hp of Russian helicopter turbines
 >  >going at 50000 rpm. so should be good for a small rotary gap. if you use
a
 >  >metal enclosure you will have to pour the bits out, at least the kevlar
 >  >might  leave something to examine afterwards.
 >  >
 >  >cheers
 >  >bob
 >  >
 >  >At 15:47 31/01/03 -0700, you wrote:
 >  >>Original poster: "Terry Fritz" <teslalist-at-qwest-dot-net>
 >  >>
 >  >>Just a note:
 >  >>
 >  >>McMaster Carr sells Kevlar fabric pretty cheap and easy.
 >  >>
 >
 >>http://www.mcmaster-dot-com/param/asp/desc.asp?desc=Fabric%20Kevlar&descid=120
55
 >  >>
 >  >>That may be a nice nonconductive light weight shield.  I have never
tried
 >  >>or worked with Kevlar, but it may be a cool thing to use for parts
flying
 >  >>off high speed gaps.
 >  >>
 >  >>Cheers,
 >  >>
 >  >>         Terry
 >  >>
 >  >>
 >  >>At 10:01 PM 1/31/2003 +0000, you wrote:
 >  >>>Hi guys
 >  >>>
 >  >>>I recently finished building the rotor for my ASRG. Due to a bunch of
 >  >>>different reasons I decided to go with a small rotor that spun very
fast.
 >  >>>The finished item was about 3.5" in diameter and runs at least 12000
rpm.
 >  >>>I was inspired by the propeller gap that Terry Blake made, so my
design
 >  >>>also has prong-like electrodes sticking out of a hub. Unlike the
 >  >>>original, though, the electrodes are bolted in place. I put some
pictures
 >  >>>online, at
 >  >>>
 >  >>>http://homepages.strath.ac.uk/~cnbp111/tcpropeller.html
 >  >>>
 >  >>>if anyone is interested. I balanced it as well as I could and it's
 >  >>>getting tested tomorrow. My plan is to stick it inside a steel pot,
hide
 >  >>>under the workbench, crank the motor up to 240 volts, and see if
anything
 >  >>>gives.
 >  >>>
 >  >>>Steve C.
 >  >>
 >  >>
 >  >
 >  >
 >  >
 >  >
 >
 >
 >