----- Original Message -----
Sent: Thursday, March 12, 2009 12:09
PM
Subject: [FlyRotary] IVO Prop
Mike,
Have been following this with much interest...........If you may
recall I also have the "IVO"
for my "DELTA" and from previous posts (Some Time Ago) we discussed how
to reduce
or eliminate the drag penalty of the flat virtually pitchless root
section of the blades........I
had already decided to eliminate this drag by using the large 16 inch
diameter "Mustang II"
spinner which I believe you have incorporated on your "RV4"...........I
have spent the last
2.5 years watching after aging parents so am far behind with my "DELTA"
and have not
been able to test my drag reduction theory for the "IVO"..........I would
be very interested
to hear from anyone of the group with a tractor /IVO installation that
may have used a large
diameter spinner to reduce and/or eliminate the drag from the root
section of the blades.....
The 16 inch spinner will cover most but not all of this
virtually flat root section........ If the
airframe/cowl will handle an 18 inch spinner then all of this root
section will be covered if
I recall correctly (I am not at the
hangar).........FWIW
--
Kelly Troyer
"Dyke Delta"_13B
ROTARY Engine
"RWS"_RD1C/EC2/EM2
"Mistral"_Backplate/Oil Manifold
--------------
Original message from "Mike Wills" <rv-4mike@cox.net>: --------------
> John,
>
> I looked pretty seriously at the
IVO a number of years ago. But was scared
> off by a number of
things:
>
> 1) Watched Dave Atkins repairing a delaminated
trailing edge on the flight
> line at Copperstate fly-in.
> 2)
A friend with a Kolb Firestar/Rotax 503/ground adjustable IVO had the
> prop come apart in flight resulting in a forced landing that
totaled the
> plane.
> 3) Tracy's experience re reduced
performance at speed.
> 4) The issues experienced by Lyc powered
users.
>
> Numbers 1 & 2 were possibly due to something
going through the prop with the
> engine running. Issue 4 seems to be
not relevant. This leaves Tracy's
> experience with the IVO. I wasnt
thinking about the fact that you fly a
> pusher when I asked, but
presumably a pusher would not have the prop root
> issue that Tracy
reported. On my RV-4 I use a much larger than stock spinner
> and
this issue may not be as significant as it was for Tracy. But I'm not
> sure I want to buy one to find out. My current prop seems to be
pretty close
> though I havent flown it enough to really make a
judgement.
>
> Thanks for the feedback.
>
> Mike
Wills
> RV-4 N144MW
>
>
>
> -----
Original Message -----
> From: "John Slade"
> To: "Rotary motors in aircraft"
> Sent: Tuesday, March 10, 2009 9:41 PM
> Subject: [FlyRotary] IVO Prop
>
>
> > >I
didn't know anyone had ever had any success with an IVO. Tell me more.
> > What do you want to know? Its a very well engineered piece of
equipment.
> > The CF blades are hollow and have a steel rod
running to the hub.
> > Activating the motor via brushes twists
the steel and thus twists the
> > blades equally. The twist change
is quite visible. There were problems
> > with the individual
blades slipping on the hub. This has been solved by
> > providing
a knurled hub, and not selling to guys with Lycomings. The IVO
> >
is available for rotary, subaru, Franklin 6 and other less "pulsy"
>
> engines. After the first 15 hours or so my blades have hardly taken any
> > extra torque.
> >
> > My performance is
greatly enhanced compared to the fixed pitch Performance
> > prop.
Static with the wood prop was around 4500. With the IVO on full fine
> > I get closer to 5400 which gives me access to a lot more power
on take
> > off. I've never done a "high speed" run with the IVO,
but I've had 180 kts
> > indicated at 2000' a few times without
much effort, and without ever going
> > to the full course
setting. Another nice bonus is that throttled back on
> > full
fine for landing, the prop acts like a brake. Its much easier to land
> > and stop than the fixed pitch that's pushing you along fairly
well, even
> > at idle.
> >
> > I know a
Velocity driver (Mike Watson) who also uses an IVO (Franklin 6)
>
> and is very happy with it after around 5 years of use.
> >
> > The factory people are very easy to deal with and very
helpful.
> >
> > The Cozy Girrrls are installing an IVO.
What better recommendation could
> > you want? :)
> >
> > Regards,
> > John Slade
> > Turbo Rotary
Cozy IV, N96PM
> > 98.1 Hrs.
> >
> > Mike
Wills wrote:
> >>
> >>
> >> Mike
Wills
> >> RV-4 N144MW
> >>
> >>
----- Original Message ----- From: "John Slade"
> >> To: "Rotary motors in aircraft"
> >> Sent: Tuesday, March 10, 2009
10:30 AM
> >> Subject: [FlyRotary] Re: Ground Testing
>
>>
> >>
> >>> The IVO electric in-flight
adjustable costs around $2350. I'm very
> >>> pleased with
mine. My "spare" is a $2700 fixed pitch wood prop thats a
>
>>> piece of art, but doesn't work anywhere near as well.
>
>>> John
> >>>
> >>> Tracy Crook
wrote:
> >>> A variable pitch prop would be nice to get the
best of both worlds but
> >>> it's an expensive option and
$10,000 buys a lot of gas.
> >>>
> >>>
> >>>
> >>> --
> >>>
Homepage: http://www.flyrotary.com/
> >>> Archive and UnSub:
> >>>
http://mail.lancaironline.net:81/lists/flyrotary/List.html
>
>>>
> >>
> >>
> >>
>
>> --
> >> Homepage: http://www.flyrotary.com/
>
>> Archive and UnSub:
> >>
http://mail.lancaironline.net:81/lists/flyrotary/List.html
> >>
> >
> >
> > --
> > Homepage:
http://www.flyrotary.com/
> > Archive and UnSub:
> >
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> >
>
>
>
> --
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