Re: Wing Post Socket Attachment to Rolled Motor Sticks

From: Marty Sasaki <marty_at_mss.tzo.com>
Date: Sat, 14 Jul 2007 07:41:56 -0000

--- In Indoor_Construction_at_yahoogroups.com, "calgoddard"
<calgoddard_at_...> wrote:
>
> After building many planes with solid motor sticks, I am
> experimenting with my first rolled motor sticks for planes of 3
> grams and more (I'm not ready to take on F1D yet!).

Sure you are. If you are building EZB's right now, you can build an F1D.
 
> I understand that with a rolled motor stick the wing posts extend
> throuh holes in the motor stick itself. Obviously you don't want to
> be drilling multiple sets of holes in the motor stick and you can't
> really remove wing post sockets from a rolled motor stick without
> risking damage to the motor stick. Affixing the wing post sockets to
> the side of the rolled motor stick seems problematic but maybe this
> can easily be done without problems.

The record setting, and event winning, F1M's are on the long side of
things. I think with these configurations that the exact placement of
the wing isn't that critical. If you build light, you can move the
ballast to get the CG you want. Make a jig to drill or cut the holes.
You can either attach the wings to posts and then use tissue tubes in
the motor stock, or you can glue to posts to the motorstick, and use
tissue tubes glued to the wing.

With F1M and LPP I've seen models with multiple sets of tissue tubes.
It's pretty easy to make weight with these classes so having mutliple
sets of tubes isn't likely to incur a weight penalty.

Why are the "saddles" problematic? You just have to find the balance
between weight and strength, which is something that we are always
doing anyway. Drilling holes in the motorstick can be problematic,
it's easy to split the wood if your cutting tool isn't sharp or if you
push too much.

Marty Sasaki
Received on Sat Jul 14 2007 - 00:42:49 CEST