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Propeller Best for Kitfox IV Classic

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bigboyzt0yz

Joined: 29 Jan 2008
Posts: 29
Location: Centeral Maryland

Posted: Tue Jul 06, 2010 12:14 pm Post subject: Propeller Best for Kitfox IV Classic

I have a Warp Drive right now and thinking about changing if you could have any prop electric ground adjustable, manual Ground Adjustable, or even not adjustable which one would it be and why? Some one said there was a carbon fiber prop that acted like a electric in flight but was just ground adjustable. It would flex enough to give u good take off and would bite in was you go faster. Warp drive taper tip right now takes off good and(800 or better FPM at 60 mph) will run the plane all day at 105 and 5,300 to 5,400 RPM.  Which one do u like $$$$  With in reason!!! Thanks all

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Lee Fritz in Owings Mills Md. 2002 KitFox-IV Classic/912UL/Warp drive taper tip/100% Complete ( Extras Strut fairings08, Grove gear09,) 300 hrs since Aug 07 "Have your feet on the Pedals and keep reaching for the sky".

Av8r3400

Joined: 22 Sep 2008
Posts: 83
Location: North Central Wisconsin (KRRL)

Posted: Tue Jul 06, 2010 5:46 pm Post subject: Re: Propeller Best for Kitfox IV Classic

IVO-Electrically adjustable. Reasonable price and the best performance you can get for a Kitfox/912 combination.

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Thanks,
Av8r3400

Kitfox Model IV-1200 W/912UL & IVO
Kitfox Model IV-1050 W/912UL & Warp
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Dick Maddux

Joined: 24 Jun 2008
Posts: 516
Location: Milton, Fl

Posted: Thu Jul 08, 2010 4:36 am Post subject: Propeller Best for Kitfox IV Classic

Lee,

  This is an interesting subject. I had the Warp on my Kitfox and removed it for the Kiev. I was told that I would get better, smoother and quieter operation then the Warp. I saw it on some Highlanders and was thrilled with its beauty ! (still am) Its about 1 lb lighter than the Warp.

  However after several pitch changes with it I have found it to be no better in speed than my Warp was. It is however turbine smooth and extremely quiet! It has to be much easier on the gearbox as they claim. It is a dramatic difference! Most aircraft have a speed increase with this propeller. As an example a Paradise P1 in our area with a smooth cowling had a 5mph speed increase going from a Warp to the Kiev. It is fast anyway. I believe the reason I didn't get an increase is due to the radial cowl on my Kitfox. The twist on the Kiev starts real early as you move away from the hub. This jams air down the open radial cowl thus increasing drag. My oil temp dropped almost 10 degrees when I put the Kiev on the plane.

   I am going to keep my Kiev as I do like its smoothness and have not lost performance.

  I have come to believe,however,that the Ivo might be the best overall prop in terms of speed as it is flexible. It sure isn't pretty though. Looks like a model airplane propeller and has stick on tape leading edges rather than a nice inlay as on the Warp (brass on the Kiev)

  The Warp is a really tough prop, made well. I have mine hanging on the wall of my hanger in case I were to decide to go back to it in case I broke a blade or something on the Kiev.

  Anyway, that's my opinion.

                                              Dick Maddux

                                              Fox 4

                                              Milton,Fl

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lcfitt(at)sbcglobal.net
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Posted: Thu Jul 08, 2010 5:39 am Post subject: Propeller Best for Kitfox IV Classic

Dick,  

  

 Interesting report on the Kiev vs. the  Warp.  The trim on the Ivo being wholly in the end of the prop might the  reason it is so well received.  With the big round air scoop in the Model  IV, the flexible tip might be just the thing.  Leave the air alone over the  hole.  More to think about as I am getting ready to make that  decision.  Thanks for the observation.  

  

 Lowell

  



  From: Catz631(at)aol.com (Catz631(at)aol.com) 

 Sent: Thursday, July 08, 2010 5:35 AM

 To: kitfox-list(at)matronics.com (kitfox-list(at)matronics.com) 

 Subject: Re: Propeller Best for Kitfox IV  Classic

 



 Lee,

  This is an interesting subject. I had the Warp on my Kitfox and  removed it for the Kiev. I was told that I would get better, smoother and  quieter operation then the Warp. I saw it on some Highlanders and was  thrilled with its beauty ! (still am) Its about 1 lb lighter than the  Warp.

  However after several pitch changes with it I have found it to be no  better in speed than my Warp was. It is however turbine smooth and extremely  quiet! It has to be much easier on the gearbox as they claim. It is a dramatic  difference! Most aircraft have a speed increase with this propeller. As an  example a Paradise P1 in our area with a smooth cowling had a 5mph speed  increase going from a Warp to the Kiev. It is fast anyway. I believe the  reason I didn't get an increase is due to the radial cowl on my Kitfox. The  twist on the Kiev starts real early as you move away from the hub. This jams air  down the open radial cowl thus increasing drag. My oil temp dropped almost  10 degrees when I put the Kiev on the plane.

   I am going to keep my Kiev as I do like its smoothness and have not  lost performance.

  I have come to believe,however,that the Ivo might be the best overall  prop in terms of speed as it is flexible. It sure isn't pretty though. Looks  like a model airplane propeller and has stick on tape leading edges rather than  a nice inlay as on the Warp (brass on the Kiev)

  The Warp is a really tough prop, made well. I have mine hanging on  the wall of my hanger in case I were to decide to go back to it in case I  broke a blade or something on the Kiev.

  Anyway, that's my opinion.

                                               Dick Maddux

                                               Fox 4

                                               Milton,Fl

  

   [quote][b]

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bigboyzt0yz

Joined: 29 Jan 2008
Posts: 29
Location: Centeral Maryland

Posted: Wed Jul 21, 2010 5:35 pm Post subject: Re: Propeller Best for Kitfox IV Classic

Ok I have (warp drive 2 blade square TIP prop on now 13 degrees pitch) static of 5200 RPM's and it seems to be producing power. The climb was good 900' MIN (at) 60 mph 1/2 load fuel air density 2900'(temp 91) and just me in  it did feel OK. cruise is still 105 (at) 5100 so it might need to come back to 12.8 I did feel a little more vibration than the 3 blade had.The tracking is true only off a hair. am I in the ball park till my 3 blade comes back in 2 weeks? It is harder to slow down than the 3 blade but it seems to be able to fly slower than the 3 and the less weight is slower with out chatter of the gear box (1800 RPM'S). I am going to a longer run way tomorrow after work and see how it feels on something longer than 1000' with 60' trees at each end. thanks for any suggestions.

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dave

Joined: 22 Sep 2006
Posts: 1382

Posted: Sun Jul 25, 2010 6:53 am Post subject: Re: Propeller Best for Kitfox IV Classic

What is the empty weight of your IV ? 

900 ft/ min is poor for a 600 lb  IV.  If it weighs  800 lbs +  i can see that maybe........BUT



try pitching  for 5500 -5600 - 5800 static. If you into actual degrees then making it finer in 1/2 degree increments.   eg  12.5 from 13.  

redline  is 5800  and at 5200 rpm  you are only about 80% power approx which is about 65  hp.    just make sure both blade are pitched the same for the RPM you want STATIC.



 	  bigboyzt0yz wrote: 	
		  Ok I have (warp drive 2 blade square TIP prop on now 13 degrees pitch) static of 5200 RPM's and it seems to be producing power. The climb was good 900' MIN (at) 60 mph 1/2 load fuel air density 2900'(temp 91) and just me in  it did feel OK. cruise is still 105 (at) 5100 so it might need to come back to 12.8 I did feel a little more vibration than the 3 blade had.The tracking is true only off a hair. am I in the ball park till my 3 blade comes back in 2 weeks? It is harder to slow down than the 3 blade but it seems to be able to fly slower than the 3 and the less weight is slower with out chatter of the gear box (1800 RPM'S). I am going to a longer run way tomorrow after work and see how it feels on something longer than 1000' with 60' trees at each end. thanks for any suggestions.

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