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                           Yak-List Digest Archive
                                      ---
                     Total Messages Posted Sat 07/19/08: 2
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Today's Message Index:
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     1. 08:10 AM - Yak-55M Rudder Counterbalance ??  ()
     2. 11:54 AM - Re: Yak-55M Rudder Counterbalance ??  (hkgibby@yahoo.com)
 
 
 
________________________________  Message 1  _____________________________________


Time: 08:10:21 AM PST US
From: <g.hendricks@sbcglobal.net>
Subject: Yak-List: Yak-55M Rudder Counterbalance ??

Yak-55M Owners,


While recovering the tail feathers on my Yak-55M, I discovered that a
small counterbalance weight appears to be missing from the rudder horn,
and wonder what is in other Yak-55M's out there. Here's the deal...


The rudder horn has a large counterweight bolted in the forward part of
the horn that weighs 3~4 lbs. About 3 inches aft of the bolted in
counterweight is a metal bracket (plate) with two bolt holes that can
accommodate a small weight of say 3/8" thick x 1.5 in x 2.5 in (maybe up
to 1 lb of tungsten). On my airplane, evidence is that this
counterweight was never installed at the factory. After looking at two
other Yak-55M's, I found one with the small weight and one without. 


So what is supposed to be there ? Is this somehow a small trim weight
installed at the factory, if required. If it is required, how would one
determine what is the correct counterweight for a specific installation?


For all you aero majors with stability & control know how, how do I know
if the rudder is correctly counterbalanced. What are the calculations. 


This airplane has been flying just fine (I think) without the small
counterweight, and has a Vne of 450 km/h (243 mph) if that makes a
difference. I've noticed no adverse control anomalies, but since I've
never flown a different Yak-55M...have no way to compare.


I recovered the rudder with 3.4 oz heavy weight poly-fiber polyester,
and after all the finishes and paint, the rudder weighs 1.5 lbs lighter
than the rudder weighed originally with the Russian cotton / dope
finish.


Any comments would be appreciated.


George Hendricks

N95YK

Fort Worth


________________________________  Message 2  _____________________________________


Time: 11:54:34 AM PST US
Subject: Re: Yak-List: Yak-55M Rudder Counterbalance ??
From: hkgibby@yahoo.com

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