[RocketsNW] Fins on a Minimum Diameter

Tue Feb 2 20:24:22 PST 2010

Peter,
The best approach is thinking ahead. If you use the tablecloth, fine. But 
once you're done, send the dog into the muddy backyard. When the dog comes 
in, toss the tablecloth on the ground for the dog to dry off on. When your 
wife discovers, you also act surprised. Wet dog should cover up epoxy 
smells.

Comments like, "Honey. Not sure what got into him. He's never pulled the 
tablecloth off the table before."

Or, "See? You blame me for everything. But look what the dog just did!?!"

You'll be in the clear. Be careful. Don't do that too often. Don't get 
caught. And don't tell Red. Or you'll need to bribe silence with a 20 year 
old single malt. ;-)

Cheers,
Robert
----- Original Message ----- 
From: "Bill Munds" <appusher at q.com>
To: "Peter Schurke" <pmschurke at seattleschools.org>; "fred azinger" 
<fred at azinger.com>; <rockets at rocketsnw.com>
Sent: Tuesday, February 02, 2010 7:26 PM
Subject: Re: [RocketsNW] Fins on a Minimum Diameter

>
> 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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>> > Rockets at rocketsnw.com
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>> >
>> >
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