Hi! Again Geraint . Just to put my nose in again ! Are you using a light
spring balance in the top of the control stick ? This will give you a true
comparrison of load needed forward and backward to get a true balance they
will need to be equal. The tail planes are heavier rearwards since the
torque tube is not central , so even an additional coat of paint causes
more out of balance.
Regards
Bob Harrison 337 G-PTAG
-----Original Message-----
From: Graham Singleton [SMTP:grasingleton@avnet.co.uk]
Sent: 03 August 1999 09:53
Subject: Re: re: Tailplane Mass Balance
>
>Andy (Draper) tells me that the rear part of my tailplanes (ie. the chunk
>aft of the TP6) is heavier than the chunk for'ard. Don't ask me why -
but
>Andy said there are others. I'm not too far out; I can get the stick to
>stay mid-way as things stand, but there is a tendancy for the stick to
move
>back easier than it is to move forward. I want to get the balance just
>right. Regards, Lloyd Owens
>
It needs to be just right. The airplane will tend to have an unpleasant not
fully damped short period oscillation if the tailp[lane is aft heavy.
Regarding the sheet lead, I think I would be inclined to cut it into
washers and slip it onto the end of the balance arm. You will need less
lead that way, (longer moment arm) so your bird will be lighter. Finally
Redux all the weights on.
Graham
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