> 3 - Depending on the shape of your wing, you may want to try to round over the LE of
>your wing out towards the tips of the wing itself. <
And another trick I've heard of is to _sharpen_ the inboard LE of the wing with
tri-stock. A wing with a sharp LE stalls before a wing with a blunt LE, and you need
to make a wing stall inboard so it won't tip stall.
Does washout work on a flying wing?
--Bill
On Thu, 20 Apr 2000 09:33:04 -0400 Tom Sheehy <[EMAIL PROTECTED]> wrote:
Mike,
Based on my experience with flying wings, you are probably experiencing a
tip stall.
The plane is flying slowly, then all of a sudden the wing starts to 'waggle'
back and forth, and then one wing tip rapidly drops down and the plane
enters a fast spiral dive. If you haven't flown flying wings before this
can really come as a surprise because with some wings this all happens very
rapidly.
If you are flying down-wind, keep in mind that even though the plane is
moving very fast in relation to the ground, because it is flying along with
the wind it is actually flying much slower. You need to carry a lot more
speed in order to make downwind turns correctly.
As far as suggestions go for helping lessen the tendency of a wing to tip
stall, here are some things that have worked for me (all learned the hard
way, I might add)
1 - Make sure that your CG is set correctly. Here is a link on calculating
the correct CG: http://www.tpu.fi/~eesail/cg.html. Here is a good link
regarding trimming flying wings: http://aerofoam.com/wngtrmpg.html
2 - Make sure that your elevons are trimmed correctly. If your current
combination of CG and neutral trim requires a lot of up elevator, your wing
is probably flying much slower (and with a nose up attitude) than it should
be. Try adding more nose weight to get the nose down or trying some down
trim to see if it helps with the problem.
3 - Depending on the shape of your wing, you may want to try to round over
the LE of your wing out towards the tips of the wing itself. I found that
this made a big difference on my flying wing, once the CG and trim was set
correctly, to help prevent tip stalls. I can't explain the physics of it,
but by rounding over the outer 1/2 to 1/3 of the LE, the wing is more likely
to stall in the center rather than at the tips, which helps prevent the snap
roll and makes it easier to recover.
Because of the way flying wings are designed, they are very sensitive to CG
adjustments and even the smallest change can make a significant difference.
I can notice the difference if I move my 555 Rx 1/2 inch either way on the
fuselage of my FMA Razor. If you keep experimenting, eventually the right
configuration will 'click' and your wing will fly much better.
Good luck!
-- Tom
----- Original Message -----
From: Mike Kovacs
To: [EMAIL PROTECTED]
Sent: Thursday, April 20, 2000 9:00 AM
Subject: [RCSE] Questions about Flying Wing Flight Characteristics....
Well...my own flying wing, the KISS Wing, is flying.
But, I have some questions.
1. Do wings have the tendency to spiral into the
ground when in a steep downwind turn?
2. Do wings TE lift a great deal when travelling
downwind?
3. What is the best method to locate the best CG?
4. Do wings need to fly comparitively fast?
=====
Out,
Mike Kovacs
Webpage: http://www.geocities.com/j_m_kovacs
E-mail: mailto:[EMAIL PROTECTED]
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