Ed,
You have two ways to determine correct decalage (difference between
wing and stab incidence).
The first is to trim the plane for level flight at low cruising
speed. If the elevator is up you need to reduce wing incidence and if
its down you need to increase it.
The other method is to observe whether the plane looks "right" in
level flight at thermaling speeds. If it flies tail low you increase
wing incidence, and of you can, stab incidence. If it flies tail high
you decrease wing and stab incidence.
With the Legend you can't get both right because the stab is fixed.
Incidence is actually not that important as long as it isn't way off.
See you in three weeks!
Anker
At 05:15 PM 6/3/2006, Ed Anderson wrote:
Looking for Advice on Wing Incidence.
I am looking forward to flying in the June ESL event at LISF on Long Island.
I hope to see some of you there.
I have a old yellow and blue Airtronics Legend that I am trying to tune up.
I picked up a wing incidence meter and am trying to set the wing/h-stab
incidence. I don't have a recommended spec so I am trying to shoot for
something reasonable.
If I set the stab at 0 degrees on my GP incidence meter, the wing measures
1.5 degrees below the zero. I guess that would be 1.5 degrees positive
relative to the stab, correct?
Any recommendations on a good starting target?
It used to be more but I added 1/32 in shims under the rear wing hold down
to raise the back of the wing about 6 months ago and it seemed to fly
better. So I bought the incidence meter and want to set it correctly.
Unfortunately I have no idea if I am right on the money or way off. I have
the build manual but there is no recommendation in the book.
Would a 0 degree difference between the wing and the stab be a reasonable
starting point? I am thinking that there should be some difference but I may
have too much.
I hope to be able to upgrade to a Mantis or similar by the end of the
summer, but for now this is what I have to fly. Until then, I will chalk up
the work I do on this plane as a learning experience. Any advice would be
appreciated.
Best Regards,
Ed Anderson
Long Island Silent Flyers
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Anker Berg-Sonne
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