[RocketsNW] Parachute protection options

[kmcgoffin at worldaccessnet.com]

Is there any law that says you can't put the piston skirt on both sides?
+McG+


> Naa - keep the skirt non-inverted that way the piston ID takes the BP
> hit thus leaving the airframe contact surface clean for more reliable
> function.  /Steve
>
> -----Original Message-----
> From: rockets-bounces at rocketsnw.com
> [mailto:rockets-bounces at rocketsnw.com] On Behalf Of
> kmcgoffin at worldaccessnet.com
> Sent: Tuesday, November 04, 2008 9:09 PM
> To: Azinger, Fred
> Cc: rockets at rocketsnw.com
> Subject: Re: [RocketsNW] Parachute protection options
>
> 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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