Re: RE: F1D motor tube stiffness?

From: Tapio Linkosalo <tapio.linkosalo_at_iki.fi>
Date: Tue, 4 Feb 2014 14:54:19 +0200

On Mon, Feb 3, 2014 at 3:55 PM, <john_kagan_at_hotmail.com> wrote:

>
>
> Something is loose - most likely the wingpost-to-motorstick joint or the
> boron attachment to the post. Less likely, the tube attachment to the wing
> or the boron on the spars.
>

Checked the model last night. There was some wing post boron loose, but
that was on the tension side, so I wonder if that could cause the twist
(will be several days before I can try that out)...


 Hold the model by the motorstick and gently twist it torsionally enough to
> deflect the wing. You'll see the front or back deflect more than the
> other. Look closely and you should be able to find the culprit. Also,
> move the model up and down and watch the spars.
>
> _
>
Sorry, I cannot really get the point. Looking down the posts while twisting
the tube, I can compare their deflection to each other, but how to see if
one is deflecting more than the other? I tried to "fly" the front tube and
wing across my study yawed so to cause some deflection, but it did not
happen at reasonable air speeds - maybe fixing the posts did help.




-Tapio-
Received on Tue Feb 04 2014 - 04:54:21 CET