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IVO first flight

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IFLYSMODEL(at)aol.com
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Posted: Mon Dec 29, 2008 5:10 pm Post subject: IVO first flight

Hey Doug: We have not heard any more about this great propeller. Is it  still working OK, or has it been removed from service? How about some more  data??

 Lynn Nelsen

  

  In a message dated 11/14/2008 10:04:53 A.M. Eastern Standard Time,  Kayberg(at)AOL.COM writes:

  	  Quote: 	
		        Sorry, but I gotta be a little fuzzy on the details.  It was just    two short flights by two different people.  The airspeed had just been    changed because it "indicated a little low"  but the new one "indicates a    little high".   The speed runs were in level flight but the optimum    prop settings had not be reached.  175 mph is perhaps the fastest this    airframe had gone...and it has had a couple of Sensnich props on it    before.   Altitude for the runs was about 1500 feet.   It    was a cool day, so probably close to sea level.

    

   The pitch adjust worked fine.  When you lowered the nose after the    climbout, the rpms went past 3300 easily and the pitch adjust dropped it to    ???? .   Tweeking is needed because it would not turn more than 2350    static.  The owner is looking for more thrust on takeoff and more speed    at the top.  The consensus of the test pilots was, "that is the fastest    that airplane has ever gone"   ...both the level passes and the    obligitory dive to high speed down the runway were fast.

    

   I dont know the cost of the IVO, since that was not in my department, but    it is close to the cost of the ground adjust Senny.  More than a fixed    pitch, but not by a lot.

    

   the other thing was cooling.  Even with no spinner (fitting one will    be a bitch) it ran cooler than usual.   Of course it was a cool day,    but cooling seemed better.  The IVO has good pitch to the blades close to    the air inlets.

    

   Again, I would caution those out there in radio land to wait until    more testing is done.   And dont plan on it being real    scientific.  In my mind, we need to see how the prop stands the    pulses.   However, the consensus was that this is the smoothest prop    yet, so it cant all be bad.   the IVO needs to be retorqued ever    hour or so during the first 10 hours of running.  The blades "settle in"    to the grip on the hub plates and it is very important that those not get    loose.

    

   There is some plan afoot to remove one blade and try it as a two blade    (easily done with an IVO)

    

   Keep in mind this project is assisted by the Green Landings technical    staff, but not under their direct control.[img]http://cdn-cf.aol.com/se/smi/0201d20638/02[/img]

    

    

   Doug

    

   In a message dated 11/13/2008 9:23:33 P.M. Eastern Standard Time,    N1BZRich(at)aol.com writes:

    	  Quote: 	
		       Doug,

         How about some clarification of what you mean      by "a top of 175".  Is that MHP or Knots?  And what is "low      altitude"?  And since you said low altitude, I assume you are talking      indicated airspeed.  Are we talking wide open throttle?  And are      we talking about a "pass down the runway" (I seem to remember you guys are      about 500 AGL)?  And if so, what was the rpm at WOT?  Were you      able to adjust the pitch in flight to get the engine to be WOT at 3300      rpm?

         With the fixed pitch I am now using I can see      just over 200 MPH (pulling back the throttle to keep from going over 3300      rpm) on a high speed pass down the runway, but remember I am basically at      sea level.   At 5000', (again pulling back the throttle      to stay at 3300) it shows 185 to 187 MPH true.    

         Also what is the going price for the in-flight      adjustable IVO?  Does it still have those narrow cord blades?       

         How is the Cub project coming along?       And remember, you are invited to come here to fly my Cub.

     Blue Skies,

     Buz



	


   

    

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kayberg(at)AOL.COM
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Posted: Tue Dec 30, 2008 12:37 pm Post subject: IVO first flight

As I mentioned previously, the test plane was based at Green Landings, but not under our control.  One blade was removed and it was operated as a two-blade inflight adjust.  Performance was quite good, but antidotal since the test pilots were not particularly careful about getting good numbers.

 

 A small incident occured that involved questions concerning  proximity of flight  in a certain local airspace and some discussions with very high government officials security representives.  That necessitated the rapid change back to the Sensenich ground adjust before further regulatory interest was initiated.   All was resolved and the "referee picked up the flag".  No harm, no foul.  However, the Senny ground adjust pitch was reset in the process and the result has pleased the owner.  So the IVO is collecting dust until some inspiration strikes.

 

 It will be very difficult to match a polished chrome spinner with the IVO and the rest of the plane.   Asthetics are important to the owner, so the current performance with the Senny is acceptable.... tho the IVO may have been faster in the two blade configuration.   

 

 The owner is headed to Florida in a few days so it will be some months before the prop might be tried again. 

 

 Lightning business has been brisk at Green Landings, so we dont have a lot of urgency to test the IVO ourselves.

 

 Another owner has a Prince P-Tip he is about to install.   We are all placing our bets as to the results of that prop.  I will keep you posted

 

 Doug Koenigsberg 

 

   	  Quote: 	
		    Hey Doug: We have not heard any more about this great propeller. Is it still working OK, or has it been removed from service? How about some more data??

   Lynn Nelsen

    

 	


 

 

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IFLYSMODEL(at)AOL.COM
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Posted: Tue Dec 30, 2008 1:35 pm Post subject: IVO first flight

Thanks for the info, Doug.

 Lynn Nelsen



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