I have been using a three blade IVO Magnum
for several years now, and have been very happy with it. At 5250rpm on
2.17:1
drive I cruise at 160kts, static run up at that pitch is about 4400rpm...DBA





-----Original Message-----
From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net]On
Behalf Of Tommy James
Sent: Thursday, June 19, 2003 11:19 AM
To: Rotary motors in aircraft
Subject: [FlyRotary] Ivo Magnum Pitch Question


Okay, here is a real test of this groups aeronautical acumen.

On the front of my Glastar is a ground adjustable Ivo Magnum (3 blade).  The
"destructions" advise that it is adjustable from 30" to 90" pitch by turning
a large adjustment screw which twists a cam in each blade.  This screw has 5
turns stop to stop, or 12" per full turn of the screw.  The prop is
currently set at ~54" of pitch.  I ran the engine this morning to ~4500rpm
and 25" MAP.  While there was throttle left, the engine did not seem to want
to advance from there.
The plane was bouncing around like a caged animal...  This is new ( and
exciting) to someone used to C152s.

The test:
How would one determine the correct pitch for first flight and what is the
guesstimate of what that pitch should be?

Regards,
Tommy James<><
ps. no further starter problem



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