Mailing List flyrotary@lancaironline.net Message #63712
From: Ed Anderson <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Re: Old IVO Prop blades for sale
Date: Fri, 25 Aug 2017 08:10:18 -0400
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Hi Todd,
 
I understand, actually his airframe is a bit more draggy than an RV.  However, having said that, Max informed me he had talked to IVO and they suggested the try converting his IVO to a two bladed version, they indicated to him that would interfere less with airflow into his cooling inlets.
 
Tracy Crook tried an IVO prop many years back and came to the same conclusion as you, it was great for take off and climb out but he hit a “wall” around 170 mph and he also noted it interfered with cooling as well. 
 
I’ll let you know if Max is interested, but right now I think he is going to try the two bladed version
 
Thanks for you candor, Todd – always refreshing
 
Ed
 
Sent: Friday, August 25, 2017 3:25 AM
Subject: [FlyRotary] Re: Old IVO Prop blades for sale
 
Hi Ed; 
   I actually wasn't thinking that these would be very ideal for Max as I would have expected his airframe to be similar to an RV airframe. I would expect that He would want the deep pitch version like I just switched to.
But if he's finished with long trips where a high cruise speed is a big priority and is just going to be flying in the Austrian mountains, then yes this prop does have excellent take-off and climb performance. I could get off the ground in 300' (paved runway @2000'asl) and then sustain a 2400'/minute climb rate to 10000'asl. But it cruised best at a meager 120-130 mph. Top speed I ever recall seeing in level flight was 170mph.
   The blades are easy to cut down, and I should have done it, as It would have helped the top speed I believe, but I knew that eventually I would want to replace them with the deep pitch blades, and if they were still full length it would be easier to find a new home for them.
   I don't know the specs for Max's plane, but I'd suggest he do some research first as I wouldn't think they would be his best choice and he will still have to by a hub as well. And it should be the electric hub to get the most performance out of these blades. The electric CS governor is a nice addition too.
   If I seem like I'm trying to avoid perspective customers, I just want to be honest about it. I originally bought it used (almost new, never flown) from a former list member long ago who was being forced to sell off his project. I was still pretty naive about props back then (still am :-), but he was never dishonest, while still being pretty enthusiastic about how it would be a great prop for me. First flight was somewhat tempered with disappointment at cruise speeds, but I learned to be very happy with the climb instead.
 
Todd   -  could never sell used cars!
 
Todd Bartrim
 
On Thu, Aug 24, 2017 at 11:00 AM, Ed Anderson <flyrotary@lancaironline.net> wrote:
Thanks, Todd
 
I’ll pass this on to Max and see if he may be interested in getting some IVO prop blades to modify.
 
Ed
 
Sent: Thursday, August 24, 2017 1:34 PM
Subject: [FlyRotary] Old IVO Prop blades for sale
 
I no longer have a need for my old prop blades. They are 76"×30-90", left hand turning. (can be cut down)
I'm selling without the hub as im using that with the new blades.
  These are not suited for a small, fast airplane, but would be good for a larger slower airplane that wants a variable pitch.
    Unfortunately (for me)a large, slow airplane would probably also be better suited to using the RD-1C with 2.85:1 reduction which is right hand turning.
   So most likely prospective buyer already has this prop and may be interested in a few spare replacement blades.
   If someone needed these for a new install then they would have to buy the hub from IVO.
   I'm not even sure what these would be worth, so I'm open to offers.
 
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