[RocketsNW] Fins on a Minimum Diameter

[Bill Munds]

depends if you are at Reds house or.......



 
> Date: Tue, 2 Feb 2010 15:30:05 -0800
> From: pmschurke at seattleschools.org
> To: fred at azinger.com; rockets at rocketsnw.com
> Subject: Re: [RocketsNW] Fins on a Minimum Diameter
> 
> Which do you recommend...on the wife's best tablecloth (to protect the table), or remove the tablecloth and go directly onto the table surface? I see merits to both ways...
> 
> Peter Schurke
> Science and Engineering Teacher, Lead Advisor
> Ingraham Aerospace Sciences Academy
> Ingraham High School
> 1819 N 135th St.
> Seattle, WA 98133
> 
> ________________________________
> 
> From: rockets-bounces at rocketsnw.com on behalf of Fred Azinger
> Sent: Tue 2/2/2010 3:28 PM
> To: 'rockets'
> Subject: Re: [RocketsNW] Fins on a Minimum Diameter
> 
> 
> 
> And remember when you take it out of the oven to set it on the kitchen
> table.
> 
> -----Original Message-----
> From: rockets-bounces at rocketsnw.com [mailto:rockets-bounces at rocketsnw.com]
> On Behalf Of Scott Berfield
> Sent: Tuesday, February 02, 2010 10:33 AM
> To: 'Christopher Guenther'; 'Julian Picard'
> Cc: 'rockets'
> Subject: Re: [RocketsNW] Fins on a Minimum Diameter
> 
> I recommend that if you plan on using the kitchen oven, you wait until the
> wife is out.
> 
> -----Original Message-----
> From: rockets-bounces at rocketsnw.com [mailto:rockets-bounces at rocketsnw.com]
> On Behalf Of Christopher Guenther
> Sent: Tuesday, February 02, 2010 10:03 AM
> To: Julian Picard
> Cc: rockets
> Subject: Re: [RocketsNW] Fins on a Minimum Diameter
> 
> I wrapped a coupler with a waxy freezer paper and went completely through
> the wall to the paper and 30 minute epoxied the fins into place. When the
> epoxy had set enough to hold and still be a tad pliable I removed the
> coupler with the waxy paper then popped the fincan into the preheated oven
> at 250 for about 30 minutes. (be sure to constantly check to make sure you
> are not starting to darken the tubing or smoking) If the fincan is to long
> for your oven door to shut that is fine just make sure you have lots of
> ventilation in your kitchen. Then after it has been oven hardened I started
> layering epoxy mixed with milled fiber (you can get milled fiber from Tap
> Plastics) along the fin root to even it out and to build the curve from the
> fin to the body. (Fiber Glass and Carbon Fiber do not like to form to sharp
> corners very well.) With each layer I oven hardened again, and remember to
> give a light sanding in beteween each layer it will help smooth out any
> dimples/bubbles etc... and make it easier for the next epoxy layer to bond.
> After I reached a point that I was satisfied with my layered curve I spread
> a layer of epoxy from fintip to fintip and set my Fiber Glass in place.
> (remember to measure twice and cut once leaving at least 1/2 an inch all
> around as in my experience some fiber materials out there do shrink as the
> epoxy sets) Then when that has set start the next Fintip to fin tip and so
> on until you have done them all the way around at least once, more is ok but
> remember the more you add extra the heavier your rockets aft end will be.
> When the last fintip to fintip has set I oven harden again for about 30
> minutes. After that I gave it a light sanding to smooth it out and add
> another thin layer of epoxy, oven harden and repeat until I had reached a
> smoothness I liked. Unless you have a bad flight there will not be much
> that will phase those fins. (unless you throw in a motor made by Mike F.
> that is LOL)
> 
> Chris Guenther
> NAR L2
> 
> On Fri, Jan 29, 2010 at 5:53 PM, Julian Picard <jman13 at gmail.com> wrote:
> 
> > Hello everyone,
> >
> > My name's Julian Picard, and I'm new to the list. I'm here at the
> > University
> > of Washington, and I'm working on a building a 54mm minimum diameter, and
> > I'm looking for suggestions on how to better attach the fins.
> > What I did before is to make shallow fin slots and do some initial gluing,
> > and then solidly glassing (or with carbon fiber) the fin can.
> > I'm using a pre-glassed phenolic tube, with G10 fins.
> >
> > Thanks so much for you help!
> > Julian
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> >
> >
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