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Use of props

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cathyboone(at)softcom.net
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Posted: Wed Mar 28, 2007 9:48 pm Post subject: Use of props

I would like some opinions,

 I have an S5 Kitfox and will be putting a 912ULS on  in the near future. I also purchased an IVO 72" ground adjustable 3 blade,  medium weight. I was thinking of mounting the IVO in the 2 blade configuration  to save weight and hoping to put the plane on floats in the future. Does anyone  have any experience testing the difference in performance between the 2 and 3  blade configuration?

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Malcolmbru(at)aol.com
Guest

Posted: Thu Mar 29, 2007 3:17 am Post subject: Use of props

I have always felt that the 2 blade prop will give the best power . but 3  blades offer the most versatility  and vibration dampening options. However  I think the nickel impregnated 3 blade warp drive prop is the most durable But  you start getting into problems with inertia and can have clutch  problems. until you put floats under it  a 2 blade warp drive will  work just fine.  .Malcolm Michigan 



See what's free at AOL.com. 

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av8rps(at)tznet.com
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Posted: Thu Mar 29, 2007 12:21 pm Post subject: Use of props

Larry,

  

 I fly the IVO 3 blade lightweight blade on my amphibious  Kitfox 4 with a  912ul.  It works very well, but you do have to make  sure you use the stainless leading edge tape or water erosion will destroy the  fibreglass blades.  My Kitfox is a bit underfloated, so my prop sees a lot  of water.  But the prop handles it just fine with the metal tape (although  you should plan on replacing the tape every year or so as it tends to crack from  the blade twisting a bit in flight)

  

 After flying a Warp prop myself on an amphibious Rans S-7  with a 912s on it, I would agree the Warp drive prop is superior when it  comes to erosion.  But I am pretty convinced the IVO prop will  outperform the Warp for thrust.  Plus the IVO is lighter, therefore you  don't have gear box issues with it like you might have with the Warp.   

  

 If I were you I would just fly the plane using all 3  blades of that medium IVO.  I have three friends flying the medium 3  blade IVO on 912s powered Highlanders that are amphibs, and they all love the  prop. Particularly the power and the smoothness.  (fwiw -they previously  used the significantly more expensive sensenich 2-blade ground adjustable  prop designed specifically for the 912uls, but they like the IVO  better)   

  

 To tell you how well the IVO's perform, get  this;  My Model 4 amphib (incidentally with only 80 hp) will go 118 mph  flat out.  Now remember, that is on floats!  (see attached pic)   My reduced cruise speed (5000 rpm) is between 100-105 mph TAS.   And it will climb with me and a full tank of fuel on a warm day at 1400  fpm.  I've not found another combination of engine and prop that will  do that on a floatplane.  So I am pretty well sold on the 912 and the  IVO combination.  And fwiw - I do have a 912s that I plan on  bolting in place of my 80 hp one of these days.  And when I do, I will be  installing an IVO 3 blade medium on that new engine (can seaplane pilots ever  have enough power?)  When I have this combination installed you just might  see me out flying alongside my Cessna 180 and 185/206 floatplane buddies  <GRIN>

  

 Paul Seehafer

  

  

  

  

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cathyboone(at)softcom.net
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Posted: Thu Mar 29, 2007 8:46 pm Post subject: Use of props

Do Not Archive

  

 Thanks Paul for sharing your experience and  information. Do you remember the length of their IVO props?

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av8rps(at)tznet.com
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Posted: Wed Apr 04, 2007 1:30 pm Post subject: Use of props

Larry,

  

 I believe they are 72 inch diameter 3 blade  mediums.

  

 Paul

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cathyboone(at)softcom.net
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Posted: Mon Apr 09, 2007 8:31 am Post subject: Use of props

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 Thanks Paul,

 I purchased the 72 inch medium weight. It sounds  like I will be in good shape or at least a good starting place.

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