Re: F1D motor tube twist?

From: john_kagan <john_kagan_at_hotmail.com>
Date: Sun, 23 Aug 2009 04:34:58 -0000

--- In Indoor_Construction_at_yahoogroups.com, Tapio Linkosalo <tapio.linkosalo@...> wrote:
>
> ...The second
> one gave more problems, at launch torque (~15 to 17 g*cm) the wing
> twisted a lot, requiring lots of extra decalage to prevent a dive-in. I
> tried to figure out the source of the twist, as these two models should
> be similar, built at the same time from same materials, and weighting
> the same.

Hi Tapio,

In my experience, excessive wing twist is most likely due to problems with the wing posts or related connections. It is possible that it is due to the motorstick twisting - it will twist, and when done properly that's a good thing for the launch. But too much twist is usually caused by something else.

Hold the model by the nose and twist it back and forth while looking at the various parts. Look for the wing posts shifting in the motor stick (loose at the bottom), wing posts bending (loose boron), tissue tubes twisting (loose glue joint or lack of diagonal brace), or broken spars or wing posts.

Good luck!
Received on Sat Aug 22 2009 - 21:35:17 CEST