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Well, more of an amateur who canīt shut up

Posted by Christer on Tue Feb 05, 2002 12:09:53 PM

In reply top Ahhh expertise.. Tks may I might ask more? :)) posted by Michel Lemieux on Tue Feb 05, 2002 11:06:21 AM

: - I.E. the rotating mass effect is eliminated right ?

Yes, that too. As You know, another name for it is precession which I mentioned further down.

: - Is the rotation of the slip stream dictated by the back
: prop ??

I?m not sure if there is any residue rotation of the slip stream but, if there is it?s minimal. What I mean is that the front propeller makes the slip stream totate anti clock wise and the rear propeller stops the rotation.

: - ??? I understand this in a single prop setup....But shou
: ld this be eliminated with the 2 props

In the case of twin engined aircraft, the propellers are rotating in the opposite direction of eachother, commonly inwards. This will position the downwards going blades at the same distance from the fuselage center line and, of course, the same for the upwards going blades.
Now make these two propellers coaxial on the fuselage center line = one contra rotating unit.

: - My question was just in take off from the ground. How ba
: d is the swing compare to a single prop Griffon variant fo
: r example ?

Not bad at all, there is no swing if the propellers counteract eachother perfectly.

: - This does not sound too fun........Now who ere had this
: happened ??

I?ll say no more, SHhhhhhhhh

Christer

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