REFLECTOR: Loaner Prop

Bob Jackson (Jax Tech) bobj at jaxtechllc.com
Mon Jun 20 12:12:42 CDT 2011


Hello Alex,

 

I would be careful with the 'loaner prop' concept.  One of the few negatives
of a pusher is their 'vacuum cleaner' effect (and pulling FOD through the
blades) especially during the take-off roll, or even just high power
run-ups.

 

A loaner would be a lot safer for a tractor, but unless your well-prepared
to pay for expensive repairs to restore it if you do have problems with FOD,
I don't think borrowing a prop for Velocity run-ups and initial flight
testing would be a very good idea.  My problems are a good example of what
can happen, and to be properly repaired by MT my damage is probably going to
cost at least $1000.

 

Bob

 

  _____  

From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] On
Behalf Of Alex Balic
Sent: Monday, June 20, 2011 12:18 PM
To: 'Velocity Aircraft Owners and Builders list'
Subject: Re: REFLECTOR: Leading Edge Prop Damage Advice

 

Great!!

Thanks Scott- I will call him today and see what he can do for me!- 

 

Alex

 

  _____  

From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] On
Behalf Of Scott Derrick
Sent: Monday, June 20, 2011 10:52 AM
To: Velocity Aircraft Owners and Builders list
Subject: Re: REFLECTOR: Leading Edge Prop Damage Advice

 

Alex,

I have a nearly new Catto built for 320 HP(turbo) in a box.  Its got about
15 hours of ground test and about 4 hours of flight time. Call Craig and
mention the prop Scott has in NM.  It was going to a guy with a Cozy with a
V8 but I think the installation is taking a lot longer than he
anticipated(no surprise to me!).

I don't know if Catto would sell or lend or rent or whatever with this prop,
but it may be worth while to ask? 

It may need to be re-pitched to exactly match your plane/engine
configuration but thats not unussual for these high HP engines.  I'm think
you could at least get all your ground testing and initial flight testing
done before deciding if you need to re-pitch it.

Scott

-------- Original Message --------
Subject: Re: REFLECTOR: Leading Edge Prop Damage Advice
From: Alex Balic  <mailto:velocity_pilot at verizon.net>
<velocity_pilot at verizon.net>
To: 'Velocity Aircraft Owners and Builders list'
<mailto:reflector at tvbf.org> <reflector at tvbf.org>
Date: 06/20/2011 09:35 AM

Hi Scott,

Well, it has not been dyno’d, but the build estimate is 325-340 hp- that is
running with 4psi of boost/normalization-  I have the engine running
properly now, but I can not get the tuning done  without a good load- I
figured that if I had a Catto or similar that would get me close, I could at
least get through taxi and flight testing with one less thing to worry
about, then upgrade to a CS prop in a year or 2.

 

Alex

 

  _____  

From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] On
Behalf Of Scott Derrick
Sent: Monday, June 20, 2011 8:47 AM
To: Velocity Aircraft Owners and Builders list
Subject: Re: REFLECTOR: Leading Edge Prop Damage Advice

 

Alex,

How much HP is your engine?

Scott

-------- Original Message --------
Subject: Re: REFLECTOR: Leading Edge Prop Damage Advice
From: Alex Balic  <mailto:velocity_pilot at verizon.net>
<velocity_pilot at verizon.net>
To: 'Velocity Aircraft Owners and Builders list'
<mailto:reflector at tvbf.org> <reflector at tvbf.org>
Date: 06/20/2011 07:03 AM



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

 

  _____  

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 <mailto:bobj at computer.org>  

To: 'Velocity Aircraft Owners and Builders list' <mailto:reflector at tvbf.org>


Cc: Bob <mailto:bobj at computer.org>  & 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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