Received-SPF: none
 receiver=logan.com; client-ip=211.29.132.186; envelope-from=lendich@optusnet.com.au
Message-ID: <007301c545f4$db64a4b0$86451fd3@george>
From: "George Lendich" <lendich@optusnet.com.au>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
References: <list-890039@logan.com>
Subject: Re: [FlyRotary] Single Rotor Balance
Date: Thu, 21 Apr 2005 08:03:59 +1000
MIME-Version: 1.0
Content-Type: text/plain;
	charset="iso-8859-1"
Content-Transfer-Encoding: 7bit

 Hi Fred,
I wish I knew what your saying!

I nearly got the single beat, but realistically speaking a dynamic balance
is the only way to go.
I would suggest for chaps who are serious about smoothness and therefore
balance, getting the  two rotor balanced is a must if their mixing parts.

It does add some extra cost but in the overall scheme of things it solves
the problem - provided you can find someone who knows what their doing.

George ( down under)


> In a message dated 04/15/05 21:39 EDT Lehanover@aol.com writes:
>
> "In the single rotor, the whole rig is going to be dynamically balanced,
> so the
> two counter weights will equal the weight of the rotor exactly."
>
> Please forgive my delay in commenting on the above. It took several days
> for
> me to work up the courage to dispute anything posted by Lynn Hanover whose
> experience and knowledge place him at the very top level of the Rotary
Gods.
> How's that for kissing up (;-)?
>
> In a single rotor the counter weights must statically balance out the
> unbalance
> of the eccentric shaft PLUS the rotor, its attachments, and cooling oil.
IN
> ADDITION, they must do so without creating a longitudinal or rocking
> couple that
> will generate a dynamic unbalance. In other words, the CG plane of the
> counter
> weight combination must fall exactly on the CG plane of the unbalance
> they are
> correcting. If not, the spinning assembly will try to wobble.
>
> I realize this is a bit of a quibble but with the increasing interest in
> single rotor
> engines there should be adequate recognition that balancing one is not
easy.
> Balance Diagram courtesy of PL's ACRE NL.
>
> With all due reverence, Lynn.
>
> Fred O.
>


----------------------------------------------------------------------------
----


----------------------------------------------------------------------------
----


> >>  Homepage:  http://www.flyrotary.com/
> >>  Archive:   http://lancaironline.net/lists/flyrotary/List.html
>