Re: Re: Solid Wood F1D Motorstick

From: Jake Palmer <82.jake_at_gmail.com>
Date: Thu, 9 Jul 2015 13:02:22 -0700

My reaction is the same as Joshua. A solid motor stick only delays the
inevitable need to learn how to make rolled motor tubes and booms. F1L
might be a better place to start if someone doesn't want to attempt rolled
parts.

On Thu, Jul 9, 2015 at 11:44 AM, joshuawfinn_at_gmail.com
[Indoor_Construction] <Indoor_Construction_at_yahoogroups.com> wrote:

>
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> Evan,
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> About 3 years ago I tried a solid stick...still have it around somewhere.
> It worked ok, gave proper wing wash, etc. No bracing wire was used. The
> deflection under load paired will with the fixed pitch prop used in
> testing. Never tried it with a VP.
>
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> Right after that, my wife built a solid stick wrapped with nylon thread
> for torsional rigidity. Again, no bracing. It also worked well. What did
> not work as well was the solid tailboom, which brought about several
> observations: tailbooms are absolutely critical in terms of specifications.
> They must be not only stiff, but torsionally rigid. This is where the whole
> concept pretty much died--if you need a rolled boom, the rolled motorstick
> just isn't much more work. The other observation was that under the old
> rules, an all-solid model with absolutely no boron or carbon could be made
> to fly reasonably well (about 15 minutes in Cat I, at a time when I was
> doing about 20 with my own best models). For a junior, that wouldn't be
> half bad. I think under the new rules you'd see 12-13 minutes from such a
> model in Cat I, and probably never over 20 in Cat IV. Again, not bad for a
> beginner, and they could use it as a direct stepping stone from SO. It
> does, however, delay the inevitable of needing solid components to achieve
> maximum performance.
>
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> What would be the biggest help would be to find a way to eliminate boron
> on tailbooms. I've managed to eliminate it everywhere else while steadily
> improving the performance of my models, but the boom remains the critical
> factor. Increasing the wood thickness just won't achieve the necessary
> stiffness, a theory proven out by my Hope's latest model--it flies great,
> but there is a definite performance penalty. I really do not like using
> boron on booms--in our humid conditions, it is a never ending battle
> keeping it attached.
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> -Joshua Finn
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Received on Thu Jul 09 2015 - 13:02:23 CEST