|
|
No real problem, just that it was draggy above 150 mainly due to stalled
portion of airfoil (or lack there-of) in the center 22" of prop diameter.
This resulted in a 15 - 20 mph reduction in cruise and top speed at the same
fuel burn when compared to my Performance Prop (fixed pitch, wood).
Changing the pitch had no effect on this characteristic. Further evidence
of the problem was that engine temps went up at any given speed due to the
stalled prop near the hub.
It makes a great test load for my engine test stand though.
Tracy (broke down and ordered Blue Mountain auto pilot)
----- Original Message -----
Sent: Thursday, December 14, 2006 5:32
PM
Subject: [FlyRotary] Re: Ivo Magnum
Tracey/Bob/Anyone
What was the problem over 150 mph? What
are you using now?
Ref the IVO prop, can you give an opinion on
reliability, operation and any problems or worries. I would like to fit one to
my Europa for speed range 70 to 180 mph, probably on a 13b, if the RB Aluminum
Hsgs work out.
BR, Dave McC
On 14, Dec , at 10:17 PM, Tracy Crook
wrote:
I flew the Ivo
Magnum (high pitch version) for awhile on my -4 (ground adjustable
only) and tested it at near max pitch (~100").
Takeoff & climb was OK even though static & climb RPM was
limited to only ~4000 rpm. Flight performance will vary greatly
based on the aircraft & power to weight ratio. The -4 is an
overpowered hot rod compared to factory planes. The same setup on a
Cessna 172 might be marginal at best. Over all, the Ivo was great
below 150 mph. Above that it sucked. Pusher installations seem
to have better results with it (because it blows? : > ) sorry...
Tracy
----- Original
Message -----
From:
Bob Tilley
To:
Rotary
motors in aircraft
Sent:
Wednesday, December 13, 2006 9:51 PM
Subject:
[FlyRotary] Ivo Magnum
Folks,
I
had a question concerning the electrically adjustable Ivo, If I
forget
to go to fine pitch when landing, what kind of performance can
I
expect if I need to do a go around? Just being cautious and wanting
to
know beforehand. Is there anyone willing to own up to having done
it
already? I'm going to be running a 180 hp 13b in a Cozy MK IV.
Bob
--
Homepage:
http://www.flyrotary.com/
Archive
and UnSub: http://mail.lancaironline.net/lists/flyrotary/
|
|