"I have completed the wing structures of the Chrysalis, and have covered the
bottom only (with regular Ultracote). At present, the wings seem to twist
very freely, and I am concerned that even after covering the upper surfaces,
there will be too much twisting freedom remaining.
Should I be concerned, and, if so, what can you suggest to correct this
problem?"
From : Don Stackhouse
Reasonable question, but you don't need to worry. In just about any structure
that relies on the outer shell for stiffness of some sort, you don't get
anywhere near the designed stiffness until the "box" is closed, in other
words, until all outside surfaces are covered. The Chrysalis wing is no
exception. I think you'll find that the stiffness will be drastically greater
when you finish the rest of the covering.
If you're still nervous, get an empty shoe box. Remove the lid, and try
twisting the box. Now tape the lid back on securely and try to twist it
again. A little better, isn't it? ;-)
There are differences between the different covering brands, and we have had
1 report of flutter with transparent Micafilm. We have not had any problems
in our own tests with Monocote, regular Micafilm, and Lightweight Ultracote
(which is less stiff than the regular Ultracote you are using). Just do a
good covering job, make sure the covering is tight enough to get the wrinkles
out, but not so tight that you cause the ribs to bend. Make sure that you set
the washout after covering as shown in the plans. Don't worry, your wing's
stiffness should be fine.
Enjoy your Chrysalis, and please keep in touch!
Don Stackhouse @ DJ Aerotech
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