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1. 09:51 AM - Re: Glasair-List Digest: 1 Msgs - 10/25/17 (Charles Raymond)
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| Subject: | Re: Glasair-List Digest: 1 Msgs - 10/25/17 |
Some builders believe planes fly because of air going over the top of a win
g. Research has discovered the vacuum caused by air passing over the top c
reates less than 5% of the lift. The only reason for having a smooth top su
rfaces is to prevent bubbling turbulence from getting under the wing. You
should also have tight clearances between the ailerons, flaps, elevator and
rudder. And I have caulk in most of the seams. I also tape the bottom cont
rol surface gaps to have smoother air. The actual reason planes fly is air
deflecting off the bottom at a near right angle to the bottom of a wing. P
lanes actually hydroplane through the air displacing the aircrafts' weight
in air molecules. Formula One's find dull leading edge racers to be faster
than shiny..go figure When a Glasair is at cruise speed only the first thir
d of the bottom of a wing is deflecting air. With that in mind one should b
e careful about changing engineered wing incidence. I added a half degree
to my stabilizer to avoid having drag creating down trim. When at cruise I
can look aft and see that my elevator is lined up. The more down trim the
more drag. If you fly a fixed trike, draw a center line on the hanger floo
r and use it to align the wheel pants. Wheel pants off centered by only a d
egree or so can slow you way down. My biggest increase in performance was g
etting rid of a lot of weight that cause the nose to lift turning the front
of the lower cowling into a battering ram and by converting to a symmetric
al prop followed by scraping the factory power robbing exhaust to a NASCAR
mechanic designed one that he now sells. While in the subject of exhausts,
..don't install a straight out version on a Two because the swirling exhaus
t gases will deform the bottom wing panel cover. Just talked to a builder
that drilled three holes in carbon with out using a dust mask and has had
a cough for two years!!
Charles Raymond
craymondw@aol.com
-----Original Message-----
From: Glasair-List Digest Server <glasair-list@matronics.com>
Sent: Thu, Oct 26, 2017 7:26 am
Subject: Glasair-List Digest: 1 Msgs - 10/25/17
*
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Total Messages Posted Wed 10/25/17: 1
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Today's Message Index:
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1. 07:30 PM - On lowering wing angle of incidence (mppalmer@aol.com)
________________________________ Message 1 ______________________________
_______
Time: 07:30:09 PM PST US
From: mppalmer@aol.com
Subject: Glasair-List: On lowering wing angle of incidence
Before we mounted our wing, I wrote to the factory asking if it would be ok
ay (safe)
to lower the angle of incidence. (Because we had wing extensions, and it
seemed to me that, with more wing area, the wing wouldn't need to operate a
t
the designed AOA.)
Factory said "No!" Leave it.
Rats.
I bet this is one change that LaVelle made to his Glasair.
While it's an "easy" mod in theory (might only need to redrill holes for wi
ng attach
fittings), don't have the equipment anymore to hoist everything in the air
to do the job.
Mike Palmer <><
=======================
I vaguely recall reading a while ago about a Glasair III builder changing t
he angle
of incidence of the wing for better performance. A lower angle of incidence
might result in less trim drag at higher speeds.
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