[RocketsNW] Parachute protection options

[Robert Krausert]

I have found going out for Suski with friends help me forget piston 
recovery. ;-)

Leaving the chute outside airframe prevents hot gases from harming them.

Cheers,
Robert
----- Original Message ----- 
From: "Dennis Winningstad" <winningstad at comcast.net>
To: "'Bloom, Steven E'" <steven.e.bloom at boeing.com>; "'Steve Cutonilli'" 
<steve-c at ix.netcom.com>; <Simpsonclark at aol.com>; 
<foreveryoung at inlandnet.com>; <kmcgoffin at worldaccessnet.com>; 
<Mfreptiles at aol.com>
Cc: <rockets at rocketsnw.com>
Sent: Monday, November 17, 2008 6:17 PM
Subject: Re: [RocketsNW] Parachute protection options


> ...piston recovery uses less BP.
>
> ...piston recovery is, like, way-cool.
>
> ...I like complicated systems.
>
> ...risk is SO invigorating!
>
> Dennis S Winningstad
>
> 503-781-3529
>
> "Why not go to war just for oil? We need oil. What do Hollywood 
> celebrities
> imagine fuels their private jets? How do they think their cocaine is
> delivered to them?"
>
> Ann Coulter
>
>
> -----Original Message-----
> From: rockets-bounces at rocketsnw.com [mailto:rockets-bounces at rocketsnw.com]
> On Behalf Of Bloom, Steven E
> Sent: Monday, November 17, 2008 6:33 AM
> To: Steve Cutonilli; 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
>
> While I don't use pistons, I could still possibly offer some alternate
> creative solutions. First, could you finish the following sentence?
>
> This airframe requires a piston recovery system because...
>
> 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
> lcnt
> ussear00000001
> > Search Now
> > .
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