WIX Archives

Ahhh expertise.. Tks may I might ask more? :))

Posted by Michel Lemieux on Tue Feb 05, 2002 11:06:21 AM

In reply top An answer, hopefully posted by Christer on Tue Feb 05, 2002 09:33:04 AM

- Many tks for the answers

- I saw that bird many moons ago when they where getting ready to hang the engine on her. Glad to see it finalized

: You?re correct that the unwanted effects of a single prope
: ller are eliminated;
- I.E. the rotating mass effect is eliminated right ?
:
: there?s more than torque which make the aircraft roll in t
: he opposite direction of propeller rotation, in the case o
: f a Griffon Spit to the right;
:
: there is the slip stream which hits the fin from one side
: which in this case makes the aircraft yaw to the right;
- Is the rotation of the slip stream dictated by the back prop ??

: in the climb at high angles of attack the downwards going
: blade gets an increased pitch whereas the upwards going bl
: ade gets a decreased pitch which, again, yaws the Griffon
: Spit to the right;
- ??? I understand this in a single prop setup....But should this be eliminated with the 2 props

:
: these three effects combined are commonly known as torque.
- My question was just in take off from the ground. How bad is the swing compare to a single prop Griffon variant for example ?
:
: Then there is the precession but, for me it would take too
: many words, so I?ll leave that for the experts to explain
: .
:
: The front propeller in the contra propeller assembly is th
: e master to which pitch control is transferred from the pi
: lots lever in the cockpit. Pitch is transferred from the f
: ront propeller to the rear by means of a bearing, which II
: RC is called a translation bearing. If this should fail, w
: hich has happened on several occasions, the rear propeller
: goes into coarse pitch and is rendered useless providing
: nothing but drag. The front propeller has to do all the pu
: lling, against the will of the rear one, and full power ha
: s to be applied to even fly at minimum speed!
: (I believe that at least one of the visitors to this forum
: has personal experience of the proverbial s**t hitting th
: e fan)
- This does not sound too fun........Now who ere had this happened ??

- Cheers to all

: Christer

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