[RocketsNW] Parachute protection options

[Bloom, Steven E]

Maybe I missread the question. It is monday morning after all.  :)
Component specs and allowances for a "non-piston" recovery system in a
38mm airframe? That I do have experience with.

steve 

-----Original Message-----
From: Steve Cutonilli [mailto:steve-c at ix.netcom.com] 
Sent: Sunday, November 16, 2008 9:32 PM
To: Bloom, Steven E; Simpsonclark at aol.com; foreveryoung at inlandnet.com;
kmcgoffin at worldaccessnet.com; Mfreptiles at aol.com
Cc: rockets at rocketsnw.com
Subject: RE: [RocketsNW] Parachute protection options

You sir are a better man than I - can you describe component specs and
space allowances?  The original thread on pistons pertained to 38mm -
for all other formats you are probably correct.  /Steve 

-----Original Message-----
From: rockets-bounces at rocketsnw.com
[mailto:rockets-bounces at rocketsnw.com] On Behalf Of Bloom, Steven E
Sent: Wednesday, November 12, 2008 1:28 PM
To: Simpsonclark at aol.com; foreveryoung at inlandnet.com;
kmcgoffin at worldaccessnet.com; Mfreptiles at aol.com
Cc: rockets at rocketsnw.com
Subject: Re: [RocketsNW] Parachute protection options

or just wrap it in a burrito and toss in a handfull of dog barf.....
 
:>)

________________________________

From: Simpsonclark at aol.com [mailto:Simpsonclark at aol.com]
Sent: Wednesday, November 12, 2008 9:36 AM
To: Bloom, Steven E; foreveryoung at inlandnet.com;
kmcgoffin at worldaccessnet.com; Mfreptiles at aol.com
Cc: rockets at rocketsnw.com
Subject: Re: [RocketsNW] Parachute protection options


Graphite or glass composite pistons molded to match the inside of the
glass body tube and then sealed with an O-ring in a simple sawn and
filed groove can maintain 3 or 4 thousandths radial clearance, which is
the recommended clearance.  That won't grab a rolled and shroud-wrapped
chute. The pistons can be molded by draping a cylinder with wet glass
and pushing it to the bottom of a release-coated short piece of body
tube and then setting it on a release-coated surface, ideally a convexly
curved surface.  I have no standard preference respecting the
installation orientation.  Lube the body tube with silicone grease.
-Robert
 
In a message dated 11/11/2008 12:35:04 P.M. Pacific Daylight Time,
steven.e.bloom at boeing.com writes:

	You have cardboard pistons in your vehicle and compressor?!?!???
	
	Seriously :>),  The tolerances, surface smoothness, and lack of
a rag (parachute) laying on top of the piston make comparison.....
incomparable.
	
	steve 
	
	-----Original Message-----
	From: Bryan Young [mailto:foreveryoung at inlandnet.com] 
	Sent: Tuesday, November 11, 2008 11:26 AM
	To: kmcgoffin at worldaccessnet.com; Mfreptiles at aol.com
	Cc: rockets at rocketsnw.com
	Subject: Re: [RocketsNW] Parachute protection options
	
	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.
	> AOL Search: Your one stop for directions, recipes and all
other 
	> Holiday needs.
	>
	
http://pr.atwola.com/promoclk/100000075x1212792382x1200798498/aol?redir=
http
	
://searchblog.aol.com/2008/11/04/happy-holidays-from-aol-search/?ncid=em
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	ussear00000001
	> Search Now
	> .
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