[roc-chat] Re: Fin Jig for Large Daimeter Airframes - 5.5 inch diameter or larger
- From: J Charles Conway <joecc100@xxxxxxxxx>
- To: "roc-chat@xxxxxxxxxxxxx" <roc-chat@xxxxxxxxxxxxx>
- Date: Wed, 21 Dec 2011 06:30:06 -0800 (PST)
For Mike Lesnick
Regarding a fin tool:
I have come up with a simple inexpensive method of holding the fins straight
and have now used
this method on airframes up to 10" in diameter. I also make the same type of
tool to fit over the
motor tube so that I can fiberglass the base of the fin to the motor tube for
more strength before
assembling the fin section.One or two tools can be used depending on the
size/length of the fins.
These tools only cost a few $ each and are reusable.
To make the tool first cut a piece of min 3/8 " Baltic Birch plywood so that
it is about 2x the total
spread of the fin outline. Starting in the center draw fin slot lines the
exact width of the fins exactly
verticalandlong enough to slipoverthe fins. Then cut out a very accurate
center hole tomatch
thesize of the tubeyou aremounting the fins to. Next cut out the fin slots and
add anadditional
cutout at the baseof the slots to allow the tool to slip off over epoxy fillets
that will be added at
the baseof the fin when it is mounted. Thetool isnow ready to use.
For motor tube mounting place very accurate fin alignment lines on the tube
then slip the tool over
the tube to about 40% up the fin from the aft end. and then slip the fins
through the tool and carefully
align each with the fin line drawn earlier. Then 5 minepoxy the fin in place
being sure to that
all is properly aligned. The tool will hold the fin in that position until the
epoxy hardens. Then fully
fiberglass the fin in place above the tool for each fin and let harden. Lastly
pull off the tool and
finish the fiberglass on the fin mounts.
So far I have ended up with exact positioned totally straight fins using this
method
If you need a photo of one I take a pix for you.
- Joe C. Email: joecc100@xxxxxxxxx
- Joe C.
________________________________
From: "Lesnick, Mike" <mikel@xxxxxxxxxxx>
To: roc-chat@xxxxxxxxxxxxx
Sent: Tuesday, December 20, 2011 4:13 PM
Subject: [roc-chat] Fin Jig for Large Daimeter Airframes - 5.5 inch diameter
or larger
Does anyone have thought and advice on use of fin jigs (to hold fins straight
while under construction) for larger airframes (over 5inches in diameter)?
· Can you buy them if so what sources?
· Other options?
· Necessary & How Valuable?
Thanks
Mike
Michael Lesnick
Axiom Healthcare Group
18135 Santa Lauretta Cir
Fountain Valley, CA 92708
714-594-5720 - Office Phone
714-323-5968 - Cell
714-968-7076 - Fax
MikeL@xxxxxxxxxxx
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