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1/2 Pylon Video

Old 09-19-2009, 01:44 AM
  #26  
DeviousDave
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Default RE: 1/2 Pylon Video

I've used an Astroflight 110D (the earlier model with digital display) to cut cores by turning off the peak detection. Works a treat!
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Old 09-19-2009, 10:56 AM
  #27  
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Default RE: 1/2 Pylon Video

I'm using a home built AC source. The nichrome wire I have gets hotter in the middle than the ends and if I turn the power up enough to get the ends hot enough then I get soo much stretch I end up parting the wire trying to keep it fairly tight.

Duke
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Old 09-19-2009, 12:36 PM
  #28  
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Default RE: 1/2 Pylon Video

I wonder if it has to do with the diameter of the Nichrome. Probably easiest to replace it with fishing leader.
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Old 09-19-2009, 02:23 PM
  #29  
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Default RE: 1/2 Pylon Video

I'm just going to go by Academy and get some leader.

I ordered Keith Sparks "Building with foam" book and really want to try a few ideas, but a good cutting setup is action item 1.
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Old 09-19-2009, 07:51 PM
  #30  
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Default RE: 1/2 Pylon Video

On my foam cutter (which was quite primative), I used copper wire strands that were separated from insulated wire.  After I attached the wire to the cutter frame, I had to heat up the wire enough to where it smoked and turned black.  Then I broke the curcuit and let the wire tighten again.  Since the copper stretched so much when heated, I reconnected the circuit and resecured it (to the frame) until it was tight.  After I did this, I finally ran the foam through it.  I was able to get about half of the way through one half of a 36" circle when the wire would sag 'til it snapped.  You can guess what I did next...yep, I went through it again...about 4 more times.  

I think that I'll have try the out the steel leader idea.

KP 
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Old 09-22-2009, 07:33 PM
  #31  
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Default RE: 1/2 Pylon Video

What engines are you guys running ?
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Old 09-22-2009, 08:33 PM
  #32  
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Default RE: 1/2 Pylon Video

There are several,
VA .049's
Norvel AME's (most are mod'd)
GZ's
I broke a Picco on the heat before that video'd heat.
Rule is .061 or less, open faced. (no exhaust extensions of any sort allowed)
Cost Rule, Engine must not cost more than $100 NIB Ready to roll
The Picco, after the conversion to aircraft use, seems to make that cost rule. Depends on where ya get the parts or the guy that assembles it for you.
Any fuel, prop, mod's ...
Great fun
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