----- Original Message -----

From: Stephen Brooks

To: Rotary motors in aircraft

Sent: Sunday, December 17, 2006 7:44 AM

Subject: [FlyRotary] Re: Ivo Magnum

Buly,
I'm also running the IVO, but ground adjustable.  I had enough weight back there without adding to it, especially that far aft.  Doesn't rule out adding it later though.

On our pushers, the center of the prop isn't getting much (if any) air anyways, so I'm not sure what the drag effect of the rather flat center section of the prop will be on the Cozy.

I can definitely see where it would add a lot of drag on a typical puller configuration.

Steve Brooks

On 12/14/06, Bulent Aliev < atlasyts@bellsouth.net> wrote:

I flew my CZ-IV at medium pitch (Ivo Magnum electric 2 blade
68"diam.) and was cruising at 160 MPH with little effort. There is
waay more pitch to go. The range is 40-105" of pitch. The problem
with Ivo as I understand it, there is not enough pitch in the root of
the blades, and the faster you go the the ineffective area of the
blade spreads out from the center, since Ivo twists the blades
starting from the tip. So, the root does not see too much change.
That's only my uneducated opinion.
Buly

On Dec 14, 2006, at 5:32 PM, david mccandless wrote:

> 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/


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