Tail surface clearances

[Mike Davis]

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To: <murphy-rebel@dcsol.com> (Murphy Rebel)
From: Bob Patterson <bob.patterson@canrem.com>
Subject: Tail surface clearances
Message-Id: <E0zW04T-0003Ah-00@mail2.toronto.istar.net>
Date: Wed, 21 Oct 1998 11:21:09 -0400


You are probably OK ! Don't forget that when the rudder is
installed on the Rebel, there are special STOP BOLTS holding the tail
spring,
that act as control stops for the rudder. They hit the 'new, improved'
rudder horn on the little 'steps'. They <should> keep the rudder from
hitting
the elevator horns.

I do recall seeing small dents on one side of one of my rudders,
caused by hitting the elevator horn - I'm sure this happened when a VERY
strong gust hit the rudder while it was fully deflected (possibly while
tied down outside). The dent is only cosmetic, and the momentary contact
would not have affected control of the aircraft. Both of my Rebels have
the 'OLD STYLE' rudder horns - new ones are much better. (mine don't
have ANY stops !!)

There isn't much you can't get to dent or bend IF you push hard
enough - the Rebel was built to handle most NORMAL situations, and it does
that very well, so you don't have too much to sweat !

I'm surprised that control deflection questions are just appearing
now ! Doesn't the manual give detail as to deflections in degrees ???

Good Luck !
.....bobp

ps
Will try to remember to check deflection in INCHES next time
I get to the airport (might be a while - REAL busy with Y2K upgrades !!)

-------------------------------orig.-------------------------------------
At 05:58 PM 10/20/98 -0700, you wrote:

Bob:

This e-mail brings up something I noticed...maybe you can help clarify....

When I had all of my tail-group set up on the workbench, I noticed that a
fair amount of up deflection on the elevators would cause the elevator

horns

and pushrods to interfere with the rudder when deflected moderately left or
right.

Can you tell me...

From the horizontal, how much up and down deflection does the elevator

travel?

From the vertical, how much left and right deflection does the rudder

travel?

I can see that from my bench test, if I have a strong flare, with a good

bit

of cross control, that one elevator horn will be precariously close to the
skinned surface of the rudder.

I have re-checked the alignment of my elevator horns relative to the
elevator itself, and they are as indicated in the construction manual.

Comments?

Tim
#438R

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