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Elevator position in cruise

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matthew(at)n523rv.com
Guest

Posted: Mon Feb 20, 2006 6:19 am Post subject: Elevator position in cruise

What are you flying RV-9'rs seeing for an elevator position in cruise?  My counterbalance arm is sticking up may 3/4"-1" in cruise at 2500.  Sure seems like a lot.



Can I fix that by adding a little more shim under the HS front spar? 



Matthew Brandes,

RV-9A - N523RV

Hobbs: 15.3 Hours

www.n523rv.com

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rv9jim(at)juno.com
Guest

Posted: Mon Feb 20, 2006 7:13 am Post subject: Elevator position in cruise

Hi Matt,

        First, is this in a lightly loaded situation.  Or is it in a max

loaded situation?  If this is a lightly loaded condition, then shim stock

under the tabs on the front HS spar mounts would be required.  You are

trying to raise the tail in the present condition so raising the front of

the spar is called for.  Remember that the tail is designed to provide

down loading in normal flight configuration.  It seems as tho you have

too much down loading and your elevators are trying to reduce it by

providing a lifting moment. Try several shims of say .010 to .020

thickness.  Try one and go fly.  Continue to adjust  until you have a

slight downward positioning of the control horn in a lightly loaded

condition.  Then, as you load the aircraft up the trim will center up the

control horn on the tail and as you approach full load, the horn will be

slightly displaced upward.  I hope that makes sense.  BTW, "coke cans"

are aluminum and are thin enough to be used as shim stock.  Just clean

off the material so you don't have a sugar coating on anything.  Prime it

also.  I would probably make several shims, clean and prime them and then

go after the adjustments to the horiz. spar.



Jim

RV9-A  (QB)

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matthew(at)n523rv.com
Guest

Posted: Mon Feb 20, 2006 8:47 am Post subject: Elevator position in cruise

Jim,



Yes, lightly loaded.  It is me with 3/4 tanks.  I'll make up a batch of shims and play with it some.



Matthew Brandes,

RV-9A - N523RV

#90569

www.n523rv.com

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