On Sun, 18 Apr 2010 09:34:34 +0200, Willy VINKEN
wrote:

I've seen (lucky) pilots rely on the 'natural' stop position after
switching off.

Some brakes on the flywheel seem really efficient, some are slippery.
Anyone has bright ideas?

I have a DG600M, so a different system, built around the same engine.
The propeller must be installed in such a way that one of the blades
finds the max. piston compression a few degrees (10-20°) before the
ideal vertical position. It's impossible to have both blades set for
the same condition. You will have to paint or "mark" the reference
blade.

The propeller brake works quite well, provided the lining material and
the metal disc surface (flywheel) are both oil-free.
If necessary, renew or resurface the lining after accurate degreasing
of the flywheel's braking surface.

Aldo