----- Original Message -----
From: "Peter Zutrauen" <peterz@zutrasoft.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Sunday, September 21, 2003 8:45 PM
Subject: [FlyRotary] Counterwieght newbie question.


Hi Folks,

Apologies in advance for a simple question. I have noticed on a couple
of postings that there is a counterweight on the front of the main
shaft. If this is to counterbalance the eccentricity of the rotors, how
do they accommodate two or even three rotors, since I assume they are
offset? Is the balance a compromise on a multi-rotor engine?

In a single-rotor engine, is it possible to fully balance the engine
using this counterweight? Or would the counterweight need to be
excessively heavy?

Thanks in advance,
...Now back to regularly scheduled reasonable questions :-)
Pete
Europa builder

Hi Pete,

   There is a counter weight on the front and rear of the two rotor engine
that provides the dynamic balancing.  Not familar with the three or one
rotor.  I would think the one rotor would require a massive counterweight -
but there are a couple of people on the list building one rotor engines -
perhaps they would jump in with the correct answer.

Ed Anderson