REFLECTOR: Prop dia

[steve korney]

Thanks.... Now it make more sense...

Steve 

Date: Thu, 6 Jun 2013 12:30:54 -0500
From: velocityxl at fastmail.fm
To: reflector at tvbf.org
Subject: Re: REFLECTOR: Prop dia


  
    
  
  
    Sure    sorry Engine RPM 4200 prop 2500 RPM

    On 6/6/2013 11:23 AM, steve korney
      wrote:

    
    
      
      Ron...

          

          It would be helpful to tell us what rpm the prop is turning
          along with the engine rpm...
        

        

        

        Steve 

        

        > Date: Thu, 6 Jun 2013 11:14:25 -0500

          > From: velocityxl at fastmail.fm

          > To: reflector at tvbf.org

          > Subject: Re: REFLECTOR: Prop dia

          > 

          > Motor is good . I have been using my fixed pitch through
          the phase one 

          > and it works very well.

          > I am turning my engine 5500 rpm to get a top speed of 180
          knots So I 

          > got the IVo propeller on ebay and want to give it a try.
          It is a little 

          > long 76 diameter so I was thinking

          > of cutting it down. I will fly with it first to see what
          it is like 

          > before I cut it down. Right now I like to cruise at 145
          knots turning 

          > 4200 rpm. My comfort rpm . My goal is to

          > run the engine at 4200 and cruise 160 knots with the hope
          of not too 

          > much loss in take off performance.

          > 

          > Ron

          > 

          > 

          > On 6/6/2013 10:49 AM, John Dibble wrote:

          > > I previously flew with 1" shorter blades (66" pitch)
          for more 

          > > clearance. I couldn't quite use full power and stay
          below 2600 rpm. 

          > > So I went back to the 68" pitch recommended by IVO.
          Now I can easily 

          > > get down to 2500 rpm at full power. I think it would
          go lower, but 

          > > haven't checked. 1" change in blade length makes a
          big difference. 

          > > IVO shortened blades for me once. Seems like your
          72" blades should 

          > > work. Have you checked that the motor is working
          good?

          > >

          > > John

          > >

          > > On 6/6/2013 10:30 AM, Ron N VelocityXLFG wrote:

          > >> Lower RPM at higher speed. I have a email out to
          Ivo to see about 

          > >> making the blades shorter . Have not heard back
          yet.

          > >> From past experience they are a little slow in
          response.

          > >>

          > >>

          > >> Ron

          > >> On 6/6/2013 8:10 AM, John Dibble wrote:

          > >>> On 6/5/2013 4:13 PM, Ron N VelocityXLFG
          wrote:

          > >>>> I have a 72 dia prop on my XLFG I am
          going to try a 76 inch Dia 

          > >>>> Ivo propeller and I am a little
          concerned with the clearance . Seems

          > >>>> like I have plenty even with a high
          rotation angle. Is there any 

          > >>>> other concerns or advice out there for
          this configuration.

          > >>>>

          > >>>> Ron

          > >>>>
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          > >>>>

          > >>> If you do have ground contact, the blades
          are easily repairable or 

          > >>> you can cut a little off the ends. My 220 HP
          Franklin uses a 68" 

          > >>> IVO prop. 76" seems like a lot. What is the
          objective?

          > >>>

          > >>> John

          > >>>
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