dougsnash(at)yahoo.com
Guest
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 Posted: Thu Jan 17, 2008 8:08 am Post subject: Flight Report and Question-701 Elevator trailing edge |
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The issue with the CH-701 elevator trailing edge is
that as layed out in the plans, it works as a "Fixed
Trim Tab". If I remember correctly (my elevator is in
storage since I built it a year and a half ago)the
trialing edge is bent up with relataion to the
elevator chord line and then the trim tab attaches to
that.
If I recall correctly, this was designed into the
elevator to aid trimming out the much lighter 582
engine. A common issue when using the heavier 912 is
that the "Fixed Tab" trailing edge needs to be bent to
straight with reference to the chord line of the
elevator. Then the adjustable trim tab is used for
fine tuning in flight.
A phone call to Zenith would be my suggestion on this
issue since I could, of course, be completely out in
lala land on this one but this is how I remember it.
Do not Archive
Doug MacDonald
CH-701 Scratch Builder
NW Ontario, Canada
Wiring inst panel
--- Joe Spencer <jpspencer(at)cableone.net> wrote:
| Quote: | Dave,
I understand your thinking about the drag of the
trim tab and it may very well be correct. Maybe some
of the aerodynamics experts could shed some light on
that. However, I believe that for a given load
condition there will be a certain amount of
lift(either up or down) required of the tail and
whether that lift is produced by elevator
position/trim tab or by adjusting the angle of
incidence of the stabilizer(elevator hinges?) is
maybe immaterial for our purposes with the 701...the
induced drag is the same due to the lift requirement
being the same in each case. I stand to be corrected
here. There may be a minute difference in parasite
drag but at the speeds we are flying that hardly
matters unless this is all about theory and not
practical application, in which case I yield the
floor to more qualified/educated folks.
The suggestion to bend the trailing edge did not
originate with me. It came from ZAC, both in a phone
conversation and in Zenair Newsletter #110 dated
Jan/Feb 1999. I was referred to this
newsletter(about a year ago) by Nick Heintz for trim
adjustment. He also said DO NOT move the
stabilizer(elevator hinges?) unless ALL else fails.
The article in question is written by Mr. Heintz and
says to bend the trailing edge of the elevator. That
is what I did and it works fine and is a helluva lot
easier than moving stabilizers and such around. I
have no idea is this is true for your 601 or not. We
are talking about the 701 here.
Don't worry about the all due respect thing...I
haven't gotten any in years.
Joe
Dragging around at 96 mph TAS in a 701
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