[roc-chat] Re: Need advice for Fin Repair, Large Rocket
- From: Steve Jaben <smark.jaben@xxxxxxxxx>
- To: "roc-chat@xxxxxxxxxxxxx" <roc-chat@xxxxxxxxxxxxx>
- Date: Tue, 12 Aug 2014 22:31:34 -0700
Great ideas from all!!!
On Tuesday, August 12, 2014, Gregory Lyzenga <lyzenga@xxxxxxxxx> wrote:
> I thought of this thread today when I saw a guy wearing a T-shirt that
> said, "It's not rocket surgery!" ;-)
>
> ----------------------------------------------------------
> Gregory A. Lyzenga <lyzenga@xxxxxxx
> <javascript:_e(%7B%7D,'cvml','lyzenga@xxxxxxx');>>
> Dept. of Physics, Harvey Mudd College (909) 621-8378
> Claremont, CA 91711-5990 mobile (626) 808-5314
>
> On Aug 12, 2014, at 9:41 PM, "Adrian P. Bailey" <adrian@xxxxxxxxxxxxxxx
> <javascript:_e(%7B%7D,'cvml','adrian@xxxxxxxxxxxxxxx');>> wrote:
>
> I’m new to rocketry but I’ve done a lot of other kinds of scratch building
> and repairs over the years. I find epoxies do extremely well if they are
> reinforced with something (e.g. a small piece of flat carbon fiber rod
> across the joint or place where the stress will occur). I think Kurt is
> saying the same thing… ;)
>
>
>
> *From:* roc-chat-bounce@xxxxxxxxxxxxx
> <javascript:_e(%7B%7D,'cvml','roc-chat-bounce@xxxxxxxxxxxxx');> [
> mailto:roc-chat-bounce@xxxxxxxxxxxxx
> <javascript:_e(%7B%7D,'cvml','roc-chat-bounce@xxxxxxxxxxxxx');>] *On
> Behalf Of *Kurt Gugisberg
> *Sent:* Monday, August 11, 2014 7:45 PM
> *To:* roc-chat@xxxxxxxxxxxxx
> <javascript:_e(%7B%7D,'cvml','roc-chat@xxxxxxxxxxxxx');>
> *Subject:* [roc-chat] Re: Need advice for Fin Repair, Large Rocket
>
>
>
> You could also do a, more-or-less, surface mount fin. Glue it back in
> place where it broke off, clean the paint off of the tailcone and fin, and
> epoxy fiberglass fillets about an inch up on each side. I know that people
> say that epoxy won't stick to the plastic tailcone, but if you rough it up
> with 60 grit sandpaper , it will hold on pretty well. I have actually done
> tip to tip fiberglass on my LOC 7.5" V2 and it holds together just fine.
> You could also drill and epoxy wood or metal pins to hold the fin in
> position but I'm not sure if that is really necessary.
>
> Kurt
>
>
>
> On Mon, Aug 11, 2014 at 4:58 PM, Steve Jaben <smark.jaben@xxxxxxxxx
> <javascript:_e(%7B%7D,'cvml','smark.jaben@xxxxxxxxx');>> wrote:
>
> This is a loc V2, 7.5" diameter stretched out. I broke a fin at
> the Saturday launch. You can see pictures on Rocketry forum:
> http://www.rocketryforum.com/showthread.php?68463-Fin-Repair-Suggestions-Needed-for-Large-Rocket
>
> The tailcone is made of polypropylene. The fin tabs go through the wall
> and attached to the motor tube. There are two centering rings, one above
> and below the fin tab that is glued to the fin tab and to the motor tube.
> Epoxy doesn't really stick to poly propylene, so attaching extra centering
> rings really holds the fin to the motor tube. I don't see any other way to
> fix this, other than to cut a large window out of the polypropylene
> tailcone, cutting out the old fin tab, and then gluing the whole thing back
> up with a new fin. Getting the window of poly propylene to stick back in
> might also be a challenge. The fins really don't attach to the tail cone
> because of the polypropylene. Any other ideas or thoughts? And buying a
> whole new tail section is not really what I had in mind :)
>
>
>
>
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