REFLECTOR: Metal prop on Velocity

[Scott Baker]

MessageHello Andy,
You are correct.  Hartzell performed extensive testing of the propeller on our Velocity XL with Continental IO-550N engine.  The folks at Hartzell tested the aircraft/engine/propeller combination for 2-days ... found a harmonic situation that only instruments could detect ... worked on solving the problem ... and finally gave up.  The situation, as you say, might be entirely different with a Lycoming engine.  We have not made plans to test other aircraft.
SB
  ----- Original Message ----- 
  From: Andy Millin 
  To: 'Velocity Aircraft Owners and Builders list' 
  Sent: Wednesday, April 05, 2006 10:44 AM
  Subject: RE: REFLECTOR: Metal prop on Velocity


  It was very disappointing to hear.

  Velocity had flown with it for a while and it was looking very good.  I believe they only tried it with one engine.  It was possible, if not probable, that the prop might have worked in other combinations.

  I believe it was run with the large Continental.  Scott Baker would be able to say.

  I have the 260HP Lycoming and would have liked to have seen it tested in that configuration.

  Andy
    -----Original Message-----
    From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] On Behalf Of Andrew Ellzey
    Sent: Wednesday, April 05, 2006 2:45 AM
    To: Velocity Aircraft Owners and Builders list
    Subject: Re: REFLECTOR: Metal prop on Velocity


    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  There were problems and the prop was withdrawn and will not be made available.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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