REFLECTOR: Leading Edge Prop Damage Advice

Mon Jun 20 08:52:30 CDT 2011

I don't have anything to compare it with, but I love it. It's 68x78, turns 2400 RPMs static and will push the plane 200 MPH at 4000 feet. It will climb more than 2000 ft/min with just me in the plane. I've got an IOX-360 (parallel valve) with dual Plasma IIIs that gives me about 195 HP, I think. It took about 6 months to get the first prop 3 years ago because they were pretty backed up, but I got it overhauled last fall in a couple of weeks. Lonnie Prince is a prince.

Doug
  ----- Original Message ----- 
  From: Alex Balic 
  To: 'Velocity Aircraft Owners and Builders list' 
  Sent: Monday, June 20, 2011 9:03 AM
  Subject: Re: REFLECTOR: Leading Edge Prop Damage Advice

  Hey Doug-

  How are you liking your p-tip prop?  I want to get a properly sized prop to get my engine tuning done, and to get to flight testing,- the 160 hp 3 blade I have on there now for that purpose goes to full speed at just ¼ throttle at the moment, so I am sort of stuck until I can get a prop on there to absorb the HP.  will almost certainly upgrade to MT later on.  I contacted Catto, but he is so busy, I may not get one until the fall- so prince is another choice- how are they to work with?

  Alex

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  From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] On Behalf Of Douglas Holub
  Sent: Sunday, June 19, 2011 7:56 PM
  To: Velocity Aircraft Owners and Builders list
  Subject: Re: REFLECTOR: Leading Edge Prop Damage Advice

  That looks similar to damage one of my valve cover screws did to the edge of my Prince fixed pitch P-tip prop (maple core with carbon fiber overlaid.)  The damage was about that size and took a little bite out of the maple, too. We were traveling at the time in Amarillo, Texas. I emailed pictures of the damage to Lonnie Prince and he told me how to fix it: clean up the wound with sand paper, fill in with JB Weld, then sand it smooth in the morning. Worked great. I'm not sure if the procedure would be the same with a metal prop.

  I replaced all the star washers on my valve cover screws with split ring lock washers.

  Doug Holub

  2009 Velocity Standard FG

    ----- Original Message ----- 

    From: Bob Jackson 

    To: 'Velocity Aircraft Owners and Builders list' 

    Cc: Bob & Ann Jackson 

    Sent: Sunday, June 19, 2011 8:40 PM

    Subject: REFLECTOR: Leading Edge Prop Damage Advice

    We 'vacuumed' up another screw (looked like a Lycoming valve cover fastener, when we 'swept' the runway afterward is what did the damage) on takeoff yesterday and this time damaged the leading edge of our MT prop -- we need your repair advice:

    The damage is about 3/8" in size, with the two most troubling aspects being the break in continuity of the leading edge, and 

    the obvious separation and bending out of the lower part of the leading edge strip on the one side.  The damage is about 

    8" from  the tip of the blade.

    I assume if I were to ask MT, they would say 'scrap that blade and build a new one from scratch'!  

    We're just curious what anyone might have to say about their experiences with this type of damage, and whether or not you guys would recommend trying to fix it ourselves.  We have a new 4 blade MT prop ordered (to improve our high altitude cruise performance),  but it won't be here for 6 to 8 weeks, so if we can safely do it, we'd like to repair this damage and continue flying it until the new prop arrives.

    What does everyone think?  We don't think we can re-bridge the missing metal, but are hoping that by injecting some epoxy and filling the gap with thickened JB Weld there would continue to be adequate rigidity and strength in the remaining leading edge stainless material to prevent vibration in flight and the lose of the outer 8" of this blade -- which obviously would be bad!

    Thanks,

    Bob Jackson

    Custom Turbo XL/RG

    N2XF

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