[RocketsNW] Parachute protection options

[kmcgoffin at worldaccessnet.com]

Yup.  And with aluminum parts, don't forget the superlube.
+McG+


> Don't forget to "invert" the piston -- skirt forward.
> Think of an automobile piston on the power stroke....skirt away from the
> charge...
> Yes -- when coefficients of expansions are matched, pistons work well.
>
>
> -----Original Message-----
> From: rockets-bounces at rocketsnw.com
> [mailto:rockets-bounces at rocketsnw.com] On Behalf Of Mfreptiles at aol.com
> Sent: Monday, November 03, 2008 8:35 PM
> To: rockets at rocketsnw.com
> Subject: Re: [RocketsNW] Parachute protection options
>
> I think Steve is on to something in certain situations.
>
> Taking Steve's advice, I've built a piston for my 38mm all aluminum
> rocket.
> The piston is machined aluminum and slides really smoothly within  the
> aluminum airframe and won't bind because the piston skirt is several
> calibers long
> and the piston and airframe is the same material.  My  previous problem
> was
> the bulk of the recovery gear wrapped with nomex.   Even then, my kevlar
> harness
> was exposed to the ejection gasses and would  degrade after a few
> flights.
> With the piston, there is less bulk to pack,  and the harness above the
> piston
> stays like new.  The kevlar harness  section below the piston will
> degrade,
> but since it is shorter, less $ to  replace.
>
> Now if you asked me if I believe in phenolic pistons in cardboard, or
> plastic airframes........forget it! :)
>
> Mike F.
>
>
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