REFLECTOR: MT Prop damage

Rene Dugas dugasd at bellsouth.net
Mon Jun 20 10:37:39 CDT 2011


It will need to be repaired before you sell it anyway but airplanes that you
can not fly are no fun.  I had a large groove but missed the SS leading
edge.  Repaired with no problems and later had it replaces.  AeroComposite
now.

Rene’

 

From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] On
Behalf Of Bob Jackson
Sent: Monday, June 20, 2011 10:07 AM
To: 'Velocity Aircraft Owners and Builders list'
Subject: Re: REFLECTOR: MT Prop damage

 

Thanks Dave -- I know what you're saying is the prudent thing to do.  I
guess I'm just exploring how safely we might be able to 'push the envelope'
a little, since we only need this prop to last another month or two (~20
hours) before we will be getting another new prop anyway.

 

Thank you,

Bob

  _____  

From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] On
Behalf Of Dave T Nelson
Sent: Monday, June 20, 2011 10:55 AM
To: reflector at tvbf.org
Subject: REFLECTOR: MT Prop damage

 

Bob, I had a similar (but not as severe) damage situation on my MT three
years ago. I observed a big ding to the leading edge of my prop upon arrival
at the Oshkosh airshow. My damage was approx. 1/4 - 5/16 in length, and had
significantly dented the stainless leading edge. I went and grabbed Eric
from the MT prop booth in the airshow and pretty much dragged him out for a
look. 

Eric told me after a close examination that as long as the stainless leading
edge wasn't cracked, broken, or delaminated (separated or unglued from the
prop), that I could make a field repair with JB Weld. He told me to keep a
close eye out for any cracks or delamination, and that if I saw any, it
needed repair. 

Your damage looks much more severe than mine. Given the input I got from
Eric, and knowing what kind of extreme stress the prop is under, I would
recommend against a field repair. Your leading edge is clearly separated and
likely delaminated. Having it detach in flight would result in vibration
that could further weaken the blade. Also, the lengthwise surface cracking
an inch or so below the damage area could indicate delamination of the
fiberglass wrap... which would seriously weaken the overall structure. 

I know having a broken airplane during prime flying season is pretty much
like finding a turd in your punchbowl, but having a blade separation would
be allot worse...

Dave

Dave T. Nelson
T/L 553-4327, Voice 507-253-4327, Fax 507-253-3648
Program Director, ISC ECAT NPI & Test Engineering

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Date:


06/20/2011 09:03 AM




Subject:


Reflector Digest, Vol 75, Issue 81




Sent by:


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Today's Topics:

1. Re: Reflector Digest, Vol 75, Issue 76, Leading Edge Damage
(Fred Anderka)
2. Re: Leading Edge Prop Damage Advice (Douglas Holub)


----- Message from Fred Anderka <fred at holohil.com> on Mon, 20 Jun 2011
09:46:35 -0400 -----


To:

"reflector at tvbf.org" <reflector at tvbf.org>


Subject:

Re: REFLECTOR: Reflector Digest, Vol 75, Issue 76, Leading Edge Damage

Bob:

Have various dents on my MT prop due to stones and cowl screws (they are now
Lock Tighted). Repairs were accomplished with J B Weld epoxy to fill the
divots. The leading edge stone divot which deformed the leading edge but did
not separate from the blade was built up with J B and sanded to original
profile. Over 300 hours later all the repairs are still intact with no sign
of separation, etc. 

My only concern is the pitting on the trailing face of all the blades, the
forward face of the blades do not show any pitting or abrasion. There are
over 450 hours on the prop now. I only operate off of paved strips,
unfortunately I cannot vouch for the cleanliness of the runways and suspect
there is a certain amount of sand etc. on all but the large airport runways
with commercial traffic.

Anyone have similar pitting? Any thoughts?

Fred Anderka
XL-RG, C-GHOL 


Today's Topics:

1. Re: Leading Edge Prop Damage Advice (Douglas Holub)

----------------------------------------------------------------------

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





----- Message from "Douglas Holub" <douglas.holub at gmail.com> on Mon, 20 Jun
2011 09:52:30 -0400 -----


To:

"Velocity Aircraft Owners and Builders list" <reflector at tvbf.org>


Subject:

Re: REFLECTOR: Leading Edge Prop Damage Advice

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

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

  _____  

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:  <mailto:bobj at computer.org> Bob Jackson 
To:  <mailto:reflector at tvbf.org> 'Velocity Aircraft Owners and Builders
list' 
Cc:  <mailto:bobj at computer.org> 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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