[roc-chat] Re: Need advice for Fin Repair, Large Rocket
- From: Mike Riss <rockt_dude@xxxxxxxxxxxxx>
- To: roc-chat@xxxxxxxxxxxxx
- Date: Tue, 12 Aug 2014 15:05:01 -0700
Steve,
I'm not really versed in the proper use of tools; my experience is more along
the lines of how to abuse them ;-)
I (ab)used the router, drill, and drywall bits in my Dremel, and after some
time and effort, the fin was nothing but sawdust.
Thinking about it more, your fin is probably twice the thickness and double the
length of a fin I had to replace. That's why I was thinking something like a
regular drill bit, which would have more reach for your deeper fin root, and
just drill and grind until its gone.
Real craftspeople will hopefully have a better way to do this.
Mike
P.S. I was able to get fiberglass to stick to my 4" V2 tailcone pretty well.
The trick is in preparation. Clean well, use really gritty sandpaper, saw
blades, etc. to scuff the surface, and clean again. The way your paint stayed
stuck shows you've got the clean part down.
--------------------------------------------
On Mon, 8/11/14, Steve Jaben <smark.jaben@xxxxxxxxx> wrote:
Subject: [roc-chat] Re: Need advice for Fin Repair, Large Rocket
To: "roc-chat@xxxxxxxxxxxxx" <roc-chat@xxxxxxxxxxxxx>
Date: Monday, August 11, 2014, 6:15 PM
MikeIt's a large
fin tab attached in 3 places. Top and bottom centering
ring and the motor tube. Your thinking like a Drexel
cutting bit? Looks like a drill bit but it cuts
perpendicular to the bit?Maybe that's theist
conservative starting point?
On Monday, August 11, 2014, Mike Riss
<rockt_dude@xxxxxxxxxxxxx>
wrote:
Steve,
You can grind that out with a router and/or dremel and/or
drill bits without having to enlarge the fin slot.
Mike
--------------------------------------------
On Mon, 8/11/14, Steve Jaben <smark.jaben@xxxxxxxxx> wrote:
Subject: [roc-chat] Need advice for Fin Repair, Large
Rocket
To: roc-chat@xxxxxxxxxxxxx
Date: Monday, August 11, 2014, 4:58 PM
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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