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Float Flyr
Joined: 19 Jul 2006
Posts: 2704
Location: Campbellton, Newfoundland
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 Posted: Fri Sep 08, 2006 5:12 am Post subject: Wings Level ? |
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For cruising a cockpit adjustable rudder trim tab isn't really necessary.
Get a piece of aluminium 6061 .025" X 6" x 3" should do and staple it on
the trailing edge of your rudder with blind rivets. Neatness and following
curves counts! Set your plane up for a cruise speed and determine what
rudder corrections are needed. If you always find yourself standing on the
right rudder pedal then when you get down bend the tab slightly to the left.
Yes it's not adjustable in flight but it will take the tediousness out of
having to stand on one foot for a couple of hours at a time. It won't be
nearly as heavy as the cockpit controlled unit but it will work at a
fraction of the weight. Make sure you add checking it to your pre-flight
walk around.
I would like to see a trim on the horizontal stabilizer but the truth of the
matter is that the plane trims out pretty well just by using the tiniest bit
of flaperon input. Maybe the pendulum effect of having floats on and the
ventral fin help keep everything straight.
Noel
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Noel Loveys
Kitfox III-A
Aerocet 1100 Floats |
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smokey_bear_40220(at)yaho
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| Posted: Fri Sep 08, 2006 11:02 am Post subject: Wings Level ? |
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How about a cable with a button release in the cockpit
that pulls on a long spring or bungy attached to the
rudder cable or pedal? The "long" spring is necessary
to avoid the rapid rise in tension from a short spring
that would limit rudder movement.
You just pull a little tension on the cable/spring and
it pulls the rudder enough to trim.
The other way is a knob with a cable wrapped around a
pully that attaches to springs for both rudder sides,
if you need to adjust both ways.
Both are heavier than just a tab, but allow cockpit
adjustment without tearing the plane apart.
You can get fancy with a large servo, cables and
springs if you want electric trim.
Lots of ways to do it....
Kurt S.
--- Lynn Matteson <lynnmatt(at)jps.net> wrote:
| Quote: | I'm also thinking about a trim fin for the rudder,
Lowell. I'd like a
cabin-adjustable. The biggest problem is I don't
want to have to deal
with stripping the covering and going in there with
a servo, etc. I'm
going to think more about it after I get my Sport
Pilot Cert. and I get
to actually GO somewhere...then when my right leg
gets oversize, I'll
put that project higher on the priority list. : )
Lynn
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Beemer
Joined: 26 Aug 2006
Posts: 87
Location: Middle Georgia
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| Posted: Fri Sep 08, 2006 11:12 am Post subject: Wings Level ? |
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This is what I had, and what every Cessna 172 rudder has. Bu tI think I'm
going to be a little more suave about it on my new rudder. The RV guys are
using a balsa airplane trailing edge. Basically a wedge glued to the left
side of the rudder, at the trailing edge. Very light, and the size
determines the amount of trim. Cover or paint, and I think they look better.
The problem I had with the tab is that there isn't much meat back there to
rivet to. The flex as the rivets age lessens the effect after a while. Some
structural adhesive would have helped, but I didn't have any, and have now
re-covered my rudder.
Your system is very effective, though.
Bradley
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Beemer
KF2 (and now an M3!)
Suzuki G10 three-banger
Middle Georgia |
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Fox5flyer
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| Posted: Sat Sep 09, 2006 3:51 am Post subject: Wings Level ? |
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I believe the early RV used the knob and spring method. Something to check
out.
Deke
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