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Elevator balance

 
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Sean Blair



Joined: 09 Jan 2006
Posts: 39
Location: Colorado Springs
PostPosted: Sun Feb 26, 2006 9:27 pm    Post subject: Elevator balance Reply with quote
I had my EAA Tech Advisor perform an inspection today and he noticed something interesting that puzzles me too.  The elevators are hanging on the horizontal stabilizer with temporary pins and able to move freely.  They are not yet attached to each other and both of them settle in the down position even if you manually move them to the up position. I have rechecked the installation of the counterweights and it appears they are correct.  Is this normal?  I thought, and so did my tech advisor, the elevators would be balanced rather than fall to the down position.
 
Thanks,
 
Sean B.
#40225  

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Sean S. Blair
#40225
N967SB (reserved)
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coop85(at)bellsouth.net
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PostPosted: Mon Feb 27, 2006 4:28 am    Post subject: Elevator balance Reply with quote
Sean,
   Actually, what you have is correct.  You don’t want them extremely heavy, but purely balanced elevators will be prone to flutter.  In early my RV-6 you poured in a bunch of lead and then later drilled it out so as to achieve a slightly tail low condition.
 
Marcus
40286
 
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johnwcox(at)pacificnw.com
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PostPosted: Mon Feb 27, 2006 6:18 am    Post subject: Elevator balance Reply with quote
Marcus, at first blush my B#$%T meter hit full peg.  At A & P school we were required to trim every control surface to manufacturer specification.  That was always “Dead Nuts On”.  We were instructed to always recheck after painting.  Flutter is an important issue but I cannot initially accept an unbalanced airfoil as a sound reason for failure to balance.  So I would like to know more about flutter from balanced surfaces.
 
Others on the list please speak up and set me straight.  Ken Scott, no need to rehash your Flutter article from the RVator and why more speed from an RV-10 is going to kill all of us.  I am an inquiring mind who wants more facts.  Marcus, please don’t take any offence by the query.  “I am looking for a definitive written aeronautical engineering quote that supports (purely balanced elevators will be prone to flutter).”  My needle is returning to normal now. Thanks for the vent.
 
John - $00.02
 

From: owner-rv10-list-server(at)matronics.com [mailto:owner-rv10-list-server(at)matronics.com] On Behalf Of Marcus Cooper
Sent: Monday, February 27, 2006 4:12 AM
To: rv10-list(at)matronics.com
Subject: RE: Elevator balance

 
Sean,
   Actually, what you have is correct.  You don’t want them extremely heavy, but purely balanced elevators will be prone to flutter.  In early my RV-6 you poured in a bunch of lead and then later drilled it out so as to achieve a slightly tail low condition.
 
Marcus
40286
 
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EFDsteve(at)aol.com
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PostPosted: Tue Feb 28, 2006 5:04 am    Post subject: Elevator balance Reply with quote
My first aborted attempt at aircraft building was the GP-4, an all wood 2-seater that allegedly cruises at 240 knots.  On that plane, the designer insists that the control surfaces be perfectly balanced, to the point that after painting, holes were drilled into the lead counter balances to achieve the balance.  For what it's worth.
 
Steve Weinstock
40230

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