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ideaz1(at)sbcglobal.net
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 Posted: Sat Nov 15, 2008 8:46 am Post subject: Aileron Adustment |
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Good point to bring up. The ailerons do make a big change in the airfoil's
performance (thats their job). Dropping them like you say will lower stall
speed and also cruise speed. raising them does the opposite. When I did the
last annual on my C-150 they were found to be a couple degrees low. When I
got them up where they should be I picked up almost 5mph. at cruise (at
7000-8000msl). If I went up another 2 deg. it might go faster but like your
situation stall speed would be going up as well.
This is a good thing to add to flight testing. Starting at neutral and
adjusting up and down within about +-3 deg. max. and getting performance
numbers.
Dirk
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psm(at)att.net
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| Posted: Sat Nov 15, 2008 9:35 am Post subject: Aileron Adustment |
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Hi Guys,
Watch out for one of the real "Gotchyas" here.
For aircraft control in the stall it is very important that the wing
roots stall before the tips. This gives you aileron control and
makes for a nice straight forward stall. If you adjust the ailerons
too much you could take this beyond the good control point and make
your plane very hard to control in the stall.
There is a small amount of "Wash out" built into the ailerons to keep
them flying when the wing root stalls. I doubt this is enough to
keep them flying longer than the root of they are adjusted too far to
"Increase the stall speed" as mentioned in this thread.
This is a similar trick to adjusting the flaps to a negative
displacement to reduce lift, increase speed, and increase the stall
speed a little. You can't do this much because of the hinge
location. Even so, increasing the stall speed at the flaps has
little control implications. The ailerons are whole different kettle of fish.
Paul
XL getting close
At 08:46 AM 11/15/2008, you wrote:
| Quote: | Good point to bring up. The ailerons do make a big change in the
airfoil's performance (thats their job). Dropping them like you say
will lower stall speed and also cruise speed. raising them does the
opposite. When I did the last annual on my C-150 they were found to
be a couple degrees low. When I got them up where they should be I
picked up almost 5mph. at cruise (at 7000-8000msl). If I went up
another 2 deg. it might go faster but like your situation stall
speed would be going up as well.
|
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http://www.matronics.com/Navigator?Zenith-List |
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