[Amps] Parasitics can kill

[Roger]

Carl wrote:
> I prefer my wheels to be on the ground!
>   
In the air and on top<:-))
It's a rather common method of shaping to core material for smaller 
aircraft and even prototyping.
> Ive used a homemade hot knife with a Variac to cut foam at work to space 
> microwave antenna panels in prototyping. At home Ive replicated several V-8 
> engines when building hot rods and doing engine swaps in other vehicles.
>
> Industrial hard foam works the best altho a bit pricey.
>
>   
The most common is good old fashioned Styrofoam (TM), the blue 
building/construction insulation. It can be purchased in large blocks in 
addition to the 1" or 2" insulation sheets. Cut to shape, rough sand, 
and then cover with fiberglass and epoxy resin.  This approach doesn't 
work well with Vinyl Ester Resin as the resin dissolves the Styrofoam. 
<:-)) Does it fast too. It just seems to disappear.

73

Roger (K8RI)
> Carl
> KM1H
>
>
> ----- Original Message ----- 
> From: "k7fm" <k7fm at teleport.com>
> To: "Carl" <km1h at jeremy.mv.com>; "Dave Harmon" <k6xyz at sbcglobal.net>; 
> <amps at contesting.com>
> Sent: Wednesday, September 30, 2009 10:16 AM
> Subject: Re: [Amps] Parasitics can kill
>
>
>   
>> "Hey, thats an excellent application for an otherwise useless item, a hot
>> knife for cutting foam."
>>
>> And, the old Heath electronic switch, which was used to switch inputs to 
>> the single channel scopes, is a perfect box for the power supply to 
>> operate the foam cutting tool, along with the nichrome wire.  I used that 
>> arrangement to make a foam mold for a new fiberglass wheel well for my 
>> experimental aircraft.  Works nifty.  I have not had any parasitics since 
>> then.
>>
>> Colin  K7FM
>>
>>     
>
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