REFLECTOR: Fwd: Re: Looking at the Magnum

[Brian Michalk]

I think it's the magnitude of the power pulses.
The four cylinders are spread out over too many degrees, resulting in 
positive and negative torque on the root of the blades.  The Franklin at 
220HP is similar HP, but six cylinders.

I'm not aware of anyone testing the magnum on a 520.  If it had turbine 
type power, I'm sure it could handle a lot of power.  The problem is 
with the crush plate.  It has to hold on to the blades with friction.  
Once they start to pivot in the crush plate, they heat up and lose their 
integrity.

I think if IVO were to machine a collar to hold the blades it would work 
fine, but it would sure increase his manufacturing cost.  The design he 
has now is simple and lightweight, and proven (to not work on high power 
4-bangers).

On 4/25/2011 3:23 PM, aminetech at bluefrog.com wrote:
> That's very unfortunate.  I think it would have worked great with your 
> engine.  I've ridden in a cessna with a IO520 and the vibration seemed 
> comparable to my Franklin.  My guess is that their insurance is 
> forcing the restriction.
> John
>
> --- scott at tnstaafl.net wrote:
>
> From: Scott Derrick <scott at tnstaafl.net>
> To: reflector <reflector at tvbf.org>
> Subject: REFLECTOR: Fwd: Re: Looking at the Magnum
> Date: Mon, 25 Apr 2011 09:44:15 -0600
>
> -------- Original Message --------
> Subject: 	Re: Looking at the Magnum
> Date: 	Mon, 25 Apr 2011 08:10:34 -0700
> From: 	ivoprop <ivoprop at pacbell.net> <mailto:ivoprop at pacbell.net>
> To: 	Scott Derrick <scott at tnstaafl.net> <mailto:scott at tnstaafl.net>
>
>
>
> We will not be putting anymore Ivoprops on
> Lycoming powered aircraft due to
> vibration. We will put the propeller on the
> Continental up to the O300
>
>
> ----- Original Message -----
> From: "Scott Derrick"<scott at tnstaafl.net>  <mailto:scott at tnstaafl.net>
> To:<ivoprop at pacbell.net>  <mailto:ivoprop at pacbell.net>
> Sent: Saturday, April 23, 2011 4:27 PM
> Subject: Looking at the Magnum
>
>
> >  HI,
> >
> >  I have a Velocity RG, with a 260hp  IO520
> >
> >  Is the Magnum available for this configuration?  Must be at least 3 blade.
> >
> >  I'm looking for inflight adjustable or constant speed.
> >
> >  thanks,
> >
> >  Scott
> >
> >  -- 
> >  If you cannot work with love but only with distaste, it is better that you
> >  should leave your work.
> >  Kahlil Gibran
> >
>
>
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