[RocketsNW] Parachute protection options

[Bryan Young]

It sounds like I need to learn how pistons are designed -- they seem to work
well enough in my air compressor and vehicles. Are there any references that
contain piston design that I could look into?
-B

-----Original Message-----
From: rockets-bounces at rocketsnw.com [mailto:rockets-bounces at rocketsnw.com]
On Behalf Of kmcgoffin at worldaccessnet.com
Sent: Tuesday, November 11, 2008 2:19 AM
To: Mfreptiles at aol.com
Cc: rockets at rocketsnw.com
Subject: Re: [RocketsNW] Parachute protection options

Yes, it seems to be a delicate balance between having enough clearance to
avoid binding, and having too much clearance that can catch the parachute
or allow the piston to tilt enough to 'catch'.  It's a rather
fault-intolerant design.  Best suited for rockets made with high grade
materials and given lots of TLC before launch.  Not good for "stuff
another motor in and fly 'er" type hobby rockets.

That may have something to do with why I was never a regular user of
piston ejection.  :-)
+McG+


> In a message dated 11/9/2008 2:50:17 A.M. Pacific Standard Time,
> kmcgoffin at worldaccessnet.com writes:
> (I always wondered why the parachute didn't
> bind between the piston and body tube.)  I dunno.
>  
> It sometimes does, especially with overzealous sanding of the piston
> skirt.  The larger the airframe diameter, the more likely this can happen
> since tolerances are usually greater.
>  
> Mike F.
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