REFLECTOR: Metal prop on Velocity

[Andrew Ellzey]

That's disappointing to hear. I wonder if they tried to balance their prop to get rid of the vibrations, I guess it doesn't matter it sounds like they aren't interested in finding a solution.

Andy
  ----- Original Message ----- 
  From: Andrew Millin 
  To: Velocity Aircraft Owners and Builders list 
  Sent: Wednesday, April 05, 2006 12:26 AM
  Subject: REFLECTOR: Metal prop on Velocity


  The prop was from Hartzell.  It had their semi-scimitar blade.  Velocity noticed an increase in airspeed with it.  Things were looking good at OSH last year.  Scott Baker reported that MT was anxious that there might be another option for us.

  Unfortunately, after OSH Hartzell went to Velocity to perform some vibration tests on the aircraft.  There were problems and the prop was withdrawn and will not be made available.

  It appears they were able to provide the prop from existing parts.  I.e., they didn't develop it specially for us.  It was probably sitting on a shelf somewhere.  And is probably back on that same shelf now.

  They do not have plans to start a program to get a prop for us.

  Andy

  Andrew Ellzey <ajlz72756 at yahoo.com> wrote:
    When I purchased my kit last April after sun & fun, Velocity had a aluminum pusher prop that they were showing and testing. Has anyone heard of the results of these trials? It was supposed to be priced competitively with MT.

    Andy 
      ----- Original Message ----- 
      From: Ron Brown 
      To: Velocity Aircraft Owners and Builders list 
      Sent: Tuesd! ay, April 04, 2006 6:56 PM
      Subject: Re: REFLECTOR: Aerocomposite Prop


      I was talking to a long time Mix Master owner and asked him about the rear prop blades.  He said he never had a problem with the rear prop, just the engine - running hot back there.

      I asked the question about metal props back there, and no one could give definitive info about the problem (canard and Velocity lists).  Someone said that Mike Melville had a metal prop on of his first pushers (Vari?), he flew it and said that "damn" metal prop is vibrating and has to come off.  But beyond that, no one had any real data.

      Ronnie


        ----- Original Message ----- 
        From: HYTEC45 at aol.com 
        To: reflector at tvbf.org 
        Sent: Tuesday, April 04, 2006 6:19 PM
        Subject: Re: REFLECTOR: Aerocomposite Prop


        In a message dated 4/4/2006 2:52:17 P.M. Pacific Standard Time, michalk at awpi.com writes:
          They sell props for tractor 
          airplanes, and I assume Lycoming 4 cylinders, why do they have problems 
          here?

        One thing we have to deal with that tractors don't is the trailing edge wake from the wing hitting the prop.  Someone smarter than I may be able to chime in if this has anything to do with prop performance.  I know the mix-masters from Cessna had problems with the rear prop even though it was basically the same as the front, but with pusher blades.

        TEC  

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