REFLECTOR: Ivo

Tue Apr 28 08:24:37 CDT 2009

Kurt, I agree.   Stupid is as stupid does.

But installing an IVO on a IO360, when IVO specifically says NOT.  Just
because I think they are playing it safe?  :-\

Its difficult to believe that IVO would ignore over 95% of the market
because they have a maintenance issue.   Though the aviation industry is
very unforgiving when it come to failures, and maybe they got scared
they would loose the tiny portion they served because a few people would
not perform higher than normal maintenance procedures.

The Bonanza almost died an early death because people didn't keep the
control surfaces balanced and in rig to a higher standard than most
other GA planes required up to that period in time. Just a maintenance
issue.

I have heard that the initial fix to prevent propeller deconstruction in
flight was the repeated checking of torque at prescribed intervals and
some kind of tape that would reveal movement where movement was bad. 
This tape must absolutely be checked  prior to every flight.  Seems
simple enough, but knowing some pilots I know it would fall off the
pre-flight list after 15 or 20 negative checks.

To my mind the problem is that the failure mode is catastrophic and the
possibility more than remote if the pilot is not almost perfect in the
maintenance of the propeller.  I'm speaking of an installation on a
Lycosaur boxer engine.   The smoother output installations being immune
to the problem.

Personally I would be thrilled if IVO perfected a solution for my 520
that was proven and didn't require a life and death inspection prior to
every flight.

Scott

nmflyer1 at aol.com wrote:
> Myself, I find a big span between bulletproof... and stupidproof. ...
>
> don't follow the 'structions... Here's your sign.
>
> KW
>
>
> -----Original Message-----
> From: Scott Derrick <scott at tnstaafl.net>
> To: Velocity Aircraft Owners and Builders list <reflector at tvbf.org>
> Sent: Mon, 27 Apr 2009 9:48 pm
> Subject: Re: REFLECTOR: Ivo
>
> I'm afraid I fall into the "Bullet Proof" crowd. 
>
> You shed a blade and the options rapidly(within seconds) go from few to
> none.
>
> Scott
>
> nmflyer1 at aol.com <mailto:nmflyer1 at aol.com> wrote:
> > One thing to note here. As far as I am aware, the only IVO's to fail
> > have been due to people not following the mandatory instructions of
> > the manufacturer. If you follow the rules, the prop appears to have a
> > long life and good performance. I asked Mark Machado  how he liked the
> > performance of the IVO on their 173FGE. He told me that the takeoff
> > thrust was a cross between frightening and exhilarating.
> >
> > The prop definitely doesn't fall into the realm of put it on and
> > forget about it. Personally I believe that a little extra attention is
> > worth the cost, performance, and company backing.
> >
> > Kurt
> >
> >
> > -----Original Message-----
> > From: Dave Philipsen <velocity at davebiz.com <mailto:velocity at davebiz.com>>
> > To: Velocity Aircraft Owners and Builders list <reflector at tvbf.org <mailto:reflector at tvbf.org>>
> > Sent: Mon, 27 Apr 2009 9:17 pm
> > Subject: Re: REFLECTOR: Running without prop
> >
> > Brian Michalk wrote: 
> > > Okay, I'll jump in here... 
> > > 
> > > What I wonder, is if one took the rotational inertia of the MT, and
> > > duplicated it by adding a plate to the IVO to increase the
> > rotational > inertia, would the IVO still fail? There's no question
> > that the > pulses on the IO360 are larger than on the Franklin. Maybe
> > increasing > the inertia of the system could reduce the negative
> > torque pulses? 
> > Just thinking aloud here and from my experience with automobile
> > engines. Would a device similar to the harmonic balancer on an auto
> > engine work? As I remember, it is essentially a fairly massive iron
> > ring with some kind of rubber sandwich between it and the hub. I think
> > the rubber absorbs some of the harmonics. 
> >  
> > Dave Philipsen 
> > Velocity STD FG 
> > N83DP 
> >  
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