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gsc props changing pitch in flight
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kitfox555(at)sbcglobal.ne
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PostPosted: Sat Sep 13, 2008 1:00 pm    Post subject: gsc props changing pitch in flight Reply with quote

Has anyone had this happen to them,I have a 582 greyhead three blade gsc wood prop and on my last fight ( 20 hrs so far on prop) the pitch changed after take off , it started to vibrate some,after landing I found that one blade had changed pitch so I adjusted it took off for a short flight and still it was off by two degrees, the half's seems to have very little gap if any all torqued to 100in.Can I mill one half down to get a space for gap between the half's or has anyone wrapped each blade with something to make more gap I also found some black dust around the spinner by that blade I checked the torque on all bolts all 100 I'm thinking it might have no gap on that blade and it is slipping after full throttle , any help thanks Jerry

Jerry Evans
KitfoxII
Magalia Calif.
N582'er'
kitfox 555
[quote][b]


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peteohms



Joined: 31 Oct 2007
Posts: 224
Location: Leander, TX

PostPosted: Sat Sep 13, 2008 1:38 pm    Post subject: gsc props changing pitch in flight Reply with quote

Jerry,

Here is the advice I took on the same subject of loose blades. I bought an IVO. Cheap insurance.

Pete
Kitfox III sn 1000, 912, Grove, IVO prop
[quote] ---


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djwild2(at)hotmail.com
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PostPosted: Sat Sep 13, 2008 7:05 pm    Post subject: gsc props changing pitch in flight Reply with quote

Jerry,
The same thing happened to me once. They say when the gap is gone it's time to get a new blade, but mine looked good just not much gap left so I sprayed a couple coats of auto clearcoat on that black end and that took care of the slipping . I am not an expert on propellers but it worked for me. I have a GSC 3 blade on my Model 1 532 and It works great. Good luck
Dan Wild
Kansas


From: jerry evans (kitfox555(at)sbcglobal.net)
Sent: Saturday, September 13, 2008 3:58 PM
To: kitfox-list(at)matronics.com (kitfox-list(at)matronics.com)
Subject: gsc props changing pitch in flight


Has anyone had this happen to them,I have a 582 greyhead three blade gsc wood prop and on my last fight ( 20 hrs so far on prop) the pitch changed after take off , it started to vibrate some,after landing I found that one blade had changed pitch so I adjusted it took off for a short flight and still it was off by two degrees, the half's seems to have very little gap if any all torqued to 100in.Can I mill one half down to get a space for gap between the half's or has anyone wrapped each blade with something to make more gap I also found some black dust around the spinner by that blade I checked the torque on all bolts all 100 I'm thinking it might have no gap on that blade and it is slipping after full throttle , any help thanks Jerry

Jerry Evans
KitfoxII
Magalia Calif.
N582'er'
kitfox 555
[quote]

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kitfoxnick



Joined: 13 Apr 2008
Posts: 33
Location: Northern Maryland

PostPosted: Sun Sep 14, 2008 10:36 am    Post subject: Re: gsc props changing pitch in flight Reply with quote

Be careful I believe this prop has been Known to separate in flight creating a severe out of balance situation which could tear the engine off its mount which would then lead to a severe aft cg issue. I think GSC recommends a 5 year 500 hour TBO. There should be a gap between hub halves the lack of gap could indicate an over torque situation which could mean the prop roots are crushed. When I bought my model IV it had the 68" GSC 3 blade from 1994 and there was no gap at the hub I decided to replace the whole assembly with a Warp drive 70" taper tip that did not have the limitations the GSC had. Hope this helps if nothing else encourages you to investigate the gsc more.
Nick W.


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occom



Joined: 26 Aug 2006
Posts: 404

PostPosted: Sun Sep 14, 2008 11:02 am    Post subject: gsc props changing pitch in flight Reply with quote

I'd be inclined to send it to GSC, Mine has no gap, GSC offered a pretty
good price to check out/refurbish the prop. I also switched to warp after
reading of separations.

Do Not Archive
Dave G. Mod IV 1050/ 582
---


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Float Flyr



Joined: 19 Jul 2006
Posts: 2704
Location: Campbellton, Newfoundland

PostPosted: Mon Sep 15, 2008 7:45 am    Post subject: gsc props changing pitch in flight Reply with quote

If the prop, torqued on to spec, changes pitch in operation than either the hub or the blade roots are damaged... Either way this can result in a blade departure. A blade departure can sure put a big dent in your day. The excessive vibrations caused by a blade departure have been known to rip the engine from the plane putting the Balance part of W&B out the window... There is no recovery. Several guys have put a cable around their engines to keep them in approximately the right position in the event of a departure. You may want to consider doing this if you intend to continue flying on a potentially dangerous prop.

I’d take that prop and mount it in my den. Then get something else to fly on.


[img]cid:image001.jpg(at)01C91734.FB668CF0[/img]

Noel Loveys
Campbellton, NL, Canada
CDN AME intern, PP-Rec
C-FINB, Kitfox III-A
Aerocet 1100 floats
[url=noelloveys(at)yahoo.ca]noelloveys(at)yahoo.ca[/url]



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JetPilot



Joined: 10 Jan 2006
Posts: 1246

PostPosted: Mon Sep 15, 2008 8:36 am    Post subject: Re: gsc props changing pitch in flight Reply with quote

Your best solution to this problem would be to get a Warp Drive, Powerfin, or other composite propeller . GSC props have bad history of losing entire blades resulting in crashes. I did a lot of research on this subject, the cases are well documented on the net. In the end I chose to buy a Warp drive prop. I'm sure there will be some guys out there that will be offended by me pointing out the bad history of their favorite props, but this is the reality and well documented. Good and accurate advice is far more important that trying to make everyone happy all the time. I will be happy to start a thread post a bunch links to the GSC prop problems if need be...

As everyone here says, the loss of a prop blade is very likely fatal. The engine is ripped off the airplane in a fraction of a second ( Don't think you will have time to shut it off, its not humanly possible ), and the airplane is left uncontrollable due to the extreme tail heavy condition ( Down elevator wont be enough to keep it flying ). Do yourself a favor, spend whatever it takes to fix or replace your prop.

Mike


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PostPosted: Mon Sep 15, 2008 9:41 am    Post subject: gsc props changing pitch in flight Reply with quote

Mike, I know of only one blade departure on a GSC prop, but there may be
others. It was a person right here on this list. The closeup photos of it
indicated that it had a lot of wood rot inside the hub supposedly from being
left outside for extended periods. I'm not defending GSC nor do I own one,
but to satisfy my curiosity I'd appreciate it if you would produce some of
those cases that are so well documented. I couldn't find much.
As I recall, IVO went through some very bad times and nearly closed the
doors after some of their props shed blades. There were lots of stories
being circulated and IVO took a real beating from the feeding frenzy that
was spawned on the web. Fortunately, they recovered and they are now doing
well, or at least they appear to.
Thanks,
Deke Morisse
Mikado Michigan
S5/Subaru/CAP 397+ TT
"The aim of an argument or discussion should not be victory, but progress."
- Joseph Joubert
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Float Flyr



Joined: 19 Jul 2006
Posts: 2704
Location: Campbellton, Newfoundland

PostPosted: Mon Sep 15, 2008 9:46 am    Post subject: gsc props changing pitch in flight Reply with quote

I don't think the GSC props are that bad....BUT they do have a time expiry on them and if there is any damage or issues with any prop give it the deep six, put a clock in it or put two notches in it and call it an ashtray.


[img]cid:image001.jpg(at)01C91746.04624B30[/img]

Noel Loveys
Campbellton, NL, Canada
CDN AME intern, PP-Rec
C-FINB, Kitfox III-A
Aerocet 1100 floats
[url=noelloveys(at)yahoo.ca]noelloveys(at)yahoo.ca[/url]





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Lynn Matteson



Joined: 10 Jan 2006
Posts: 2778
Location: Grass Lake, Michigan

PostPosted: Mon Sep 15, 2008 9:50 am    Post subject: gsc props changing pitch in flight Reply with quote

Do yourself another favor and wrap a cable around the engine, through
the firewall, around the tubing, and connect the ends of the cable
together. I'm hoping that the loss of a prop blade will at least keep
the engine somewhat attached to the airframe and allow for a somewhat
balanced landing. If not, I've just spent less than $10 for some
piece of mind.

All this talk of losing prop blades makes me think that there is
something to be said for fixed pitch, one-piece props, even though
these can come undone under the right/wrong circumstances, too.

Lynn Matteson
Kitfox IV Speedster
Jabiru 2200, 562 hrs...engine assembled and back in the plane;
waiting for new ignition system
Status: "Condition grounded, but determined to try." (Pink
Floyd..."Learning to Fly")


On Sep 15, 2008, at 12:36 PM, JetPilot wrote:

Quote:


Your best solution to this problem would be to get a Warp Drive,
Powerfin, or other composite propeller . GSC props have bad
history of losing entire blades resulting in crashes. I did a lot
of research on this subject, the cases are well documented on the
net. In the end I chose to buy a Warp drive prop. I'm sure there
will be some guys out there that will be offended by me pointing
out the bad history of their favorite props, but this is the
reality and well documented. Good and accurate advice is far more
important that trying to make everyone happy all the time. I will
be happy to start a thread post a bunch links to the GSC prop
problems if need be...

As everyone here says, the loss of a prop blade is very likely
fatal. The engine is ripped off the airplane in a fraction of a
second ( Don't think you will have time to shut it off, its not
humanly possible ), and the airplane is left uncontrollable due to
the extreme tail heavy condition ( Down elevator wont be enough to
keep it flying ). Do yourself a favor, spend whatever it takes to
fix or replace your prop.

Mike

--------
"NO FEAR" - If you have no fear you did not go as fast
as you could have !!!

Kolb MK-III Xtra, 912-S


Read this topic online here:

http://forums.matronics.com/viewtopic.php?p 4392#204392




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Lynn Matteson



Joined: 10 Jan 2006
Posts: 2778
Location: Grass Lake, Michigan

PostPosted: Mon Sep 15, 2008 9:59 am    Post subject: gsc props changing pitch in flight Reply with quote

If Gary Algate sees this, tell 'em about your lost prop incident,
Gary...that was a hairy ride, I'll bet.

It might be that Deke is referring to Gary....eh, Deke?

Lynn Matteson
Kitfox IV Speedster
Jabiru 2200, 562 hrs...engine assembled and back in the plane;
waiting for new ignition system
Status: "Condition grounded, but determined to try." (Pink
Floyd..."Learning to Fly")
do not archive

On Sep 15, 2008, at 1:40 PM, fox5flyer wrote:

Quote:

<fox5flyer(at)idealwifi.net>

Mike, I know of only one blade departure on a GSC prop, but there
may be others. It was a person right here on this list. The
closeup photos of it indicated that it had a lot of wood rot inside
the hub supposedly from being left outside for extended periods.
I'm not defending GSC nor do I own one, but to satisfy my curiosity
I'd appreciate it if you would produce some of those cases that are
so well documented. I couldn't find much.
As I recall, IVO went through some very bad times and nearly closed
the doors after some of their props shed blades. There were lots
of stories being circulated and IVO took a real beating from the
feeding frenzy that was spawned on the web. Fortunately, they
recovered and they are now doing well, or at least they appear to.
Thanks,
Deke Morisse
Mikado Michigan
S5/Subaru/CAP 397+ TT
"The aim of an argument or discussion should not be victory, but
progress."
- Joseph Joubert



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Kitfox IV-Jabiru 2200
N369LM
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Fox5flyer
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PostPosted: Mon Sep 15, 2008 10:43 am    Post subject: gsc props changing pitch in flight Reply with quote

No, Gary was swinging an NSI CAP with Warp blades, not a GSC. See how
these things evolve? The Warp blade that departed stuck through his float
so he was able to land and recover it for inspection. Lots of damage, but
the engine remained attached by the various wiring and throttle cables, etc.
He's lucky to have survived.
Deke Morisse
Mikado Michigan
S5/Subaru/CAP 397+ TT
"The aim of an argument or discussion should not be victory, but progress."
- Joseph Joubert

---


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PostPosted: Mon Sep 15, 2008 10:59 am    Post subject: gsc props changing pitch in flight Reply with quote

On Mon, September 15, 2008 10:40 am, fox5flyer wrote:
Quote:


Mike, I know of only one blade departure on a GSC prop, but there may be
others. It was a person right here on this list. The closeup photos of it
indicated that it had a lot of wood rot inside the hub supposedly from being
left outside for extended periods. I'm not defending GSC nor do I own one,
but to satisfy my curiosity I'd appreciate it if you would produce some of
those cases that are so well documented. I couldn't find much.

Here's one documented and some factory comments about maintenance.

<http://www.ultralightnews.com/safety_bulletins/gsc_servicebulletin.htm>

Here's another due to blade strike during flight. GSC states 500 Hour TBO and posts a
link to the maintenance procedures.

<http://www.ultralightnews.ca/advisories1/propadvisory.htm>

Here's a 2006 posting from this list. Don't shim, buy new blades.

<http://forums.matronics.com/viewtopic.php?p=86857&sid=336a7f8b7126385eb6eb3d9c86e2c280>

Here's a 1999 Service bulletin from GSC regarding 500 hour TBO

<http://www.auf.asn.au/airworthiness/gscactualsb.doc>

Here's another article on a GSC failure from this list

<http://forums.matronics.com/viewtopic.php?p=67085>

Looks to me that finding a catastrophic failure that wasn't due to corrosion and rot
is not easily found. Quite a few hearsay claims but actually none that I could find.
Looks to me that what's consistent is:

1) exposure to water (rain) is something to be avoided due to corrosion and wood rot,
both of which lead to progressive failure.

2) don't exceed the 100 in-lb torque

3) TBO is 500 Hrs

4) Great factory support including telephone support.

Seems like a sound company and product to me. You've got to observe the limitations of
installation and usage. If you can't/won't then other options may be better suited for
you.

--
Paul A. Franz, P.E.
PAF Consulting Engineers
Office 425.440.9505
Cell 425.241.1618


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JetPilot



Joined: 10 Jan 2006
Posts: 1246

PostPosted: Mon Sep 15, 2008 11:09 am    Post subject: Re: gsc props changing pitch in flight Reply with quote

I researched propeller blade separations because I have a Kiev Hot Prop that has rave reviews for being quiet and efficient. The prop did was wonderful in flight, but the lightness of the hub and thin diameter of the adapter always made me nervous. I never did find any history of blade separations or hub failures on Kiev Hot props, but I constantly came across GSC blade separations in my research.

When an airline maintenance inspector saw my prop and made made the comment that the hub looked to " Lightly Built " to resist fatigue over time, I bit the bullet and changed out the Kiev prop for a Warp drive.

The Cable around the engine is a great idea for the Kitfox I am building, it would not help my Kolb much where the engine coming lose would probably cause the prop to slice the tail boom right off Shocked

Mike


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occom



Joined: 26 Aug 2006
Posts: 404

PostPosted: Mon Sep 15, 2008 11:40 am    Post subject: gsc props changing pitch in flight Reply with quote

I know of a blade separation on a challenger, but the prop was out of date
AFAIK. GSC has been extremely cooperative for me on the phone, but I've
elected to use the warp.
---


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PostPosted: Mon Sep 15, 2008 11:49 am    Post subject: gsc props changing pitch in flight Reply with quote

Good research, Paul. The first link is the prop that belonged to one of our
list members, but I forgot who it was.
GSC makes no secret of the limitations place on their props. So long as
those limitations are followed and the prop has proper care and servicing, I
doubt there would ever be a problem.
Often a single failure, after making the rounds of the various forums and
list servers and the anecdotal data piles up, can evolve into the appearance
of the whole line of props are failure prone. Usually, this is not so, but
still causes enormous damage to the credibility of the company.
Deke Morisse
Mikado Michigan
S5/Subaru/CAP 397+ TT
"The aim of an argument or discussion should not be victory, but progress."
- Joseph Joubert
---


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Lynn Matteson



Joined: 10 Jan 2006
Posts: 2778
Location: Grass Lake, Michigan

PostPosted: Mon Sep 15, 2008 12:17 pm    Post subject: gsc props changing pitch in flight Reply with quote

It was his incident that prompted me to install a safety cable around
my engine. His Rotax was probably also contained by the coolant
hoses....having none of these, I opted to add the cable.
Damn, Deke, I'd better get to flying...your hours are starting to get
close. : )

Lynn Matteson
Kitfox IV Speedster
Jabiru 2200, 562 hrs...engine assembled and back in the plane; new
ignition system was sent out today
Flight possible this weekend...XX (fingers crossed)
Status: "Condition grounded, but determined to try." (Pink
Floyd..."Learning to Fly")
do not archive

On Sep 15, 2008, at 2:39 PM, fox5flyer wrote:

Quote:

<fox5flyer(at)idealwifi.net>

No, Gary was swinging an NSI CAP with Warp blades, not a GSC. See
how these things evolve? The Warp blade that departed stuck
through his float so he was able to land and recover it for
inspection. Lots of damage, but the engine remained attached by
the various wiring and throttle cables, etc.
He's lucky to have survived.
Deke Morisse
Mikado Michigan
S5/Subaru/CAP 397+ TT



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Kitfox IV-Jabiru 2200
N369LM
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gary.algate(at)sandvik.co
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PostPosted: Mon Sep 15, 2008 3:19 pm    Post subject: gsc props changing pitch in flight Reply with quote

I believe that Murle Williams (Award winning Kitfox builder and distributor of aircraft products) refuses to sell a GSC prop due to "departure" issues.

Gary Algate
Classic 4 - Jab 2200
Office Phone: +61 8 8276 7655


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Re: gsc props changing pitch in flight




--> Kitfox-List message posted by: "JetPilot" <orcabonita(at)hotmail.com>

Your best solution to this problem would be to get a Warp Drive, Powerfin, or other composite propeller . GSC props have bad history of losing entire blades resulting in crashes. I did a lot of research on this subject, the cases are well documented on the net. In the end I chose to buy a Warp drive prop. I'm sure there will be some guys out there that will be offended by me pointing out the bad history of their favorite props, but this is the reality and well documented. Good and accurate advice is far more important that trying to make everyone happy all the time. I will be happy to start a thread post a bunch links to the GSC prop problems if need be...

As everyone here says, the loss of a prop blade is very likely fatal. The engine is ripped off the airplane in a fraction of a second ( Don't think you will have time to shut it off, its not humanly possible ), and the airplane is left uncontrollable due to the extreme tail heavy condition ( Down elevator wont be enough to keep it flying ). Do yourself a favor, spend whatever it takes to fix or replace your prop.

Mike

--------
&quot;NO FEAR&quot; - If you have no fear you did not go as fast as you could have !!!

Kolb MK-III Xtra, 912-S




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http://forums.matronics.com/viewtopic.php?p 4392#204392







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gary.algate(at)sandvik.co
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PostPosted: Mon Sep 15, 2008 3:20 pm    Post subject: gsc props changing pitch in flight Reply with quote

I never lost a prop Lynn! - I lost a leading edge protection strip on a GSC prop and the vibration from that caused a forced landing but there must be another Gary out there!

Gary

Gary Algate
Classic 4 jab 2200
Office Phone: +61 8 8276 7655


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Lynn Matteson <lynnmatt(at)jps.net>
Sent by: owner-kitfox-list-server(at)matronics.com
16/09/2008 03:37 AM
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Re: Re: gsc props changing pitch in flight




--> Kitfox-List message posted by: Lynn Matteson <lynnmatt(at)jps.net>

If Gary Algate sees this, tell 'em about your lost prop incident,
Gary...that was a hairy ride, I'll bet.

It might be that Deke is referring to Gary....eh, Deke?

Lynn Matteson
Kitfox IV Speedster
Jabiru 2200, 562 hrs...engine assembled and back in the plane;
waiting for new ignition system
Status: "Condition grounded, but determined to try." (Pink
Floyd..."Learning to Fly")
do not archive



On Sep 15, 2008, at 1:40 PM, fox5flyer wrote:

> --> Kitfox-List message posted by: "fox5flyer"
> <fox5flyer(at)idealwifi.net>
>
> Mike, I know of only one blade departure on a GSC prop, but there
> may be others. It was a person right here on this list. The
> closeup photos of it indicated that it had a lot of wood rot inside
> the hub supposedly from being left outside for extended periods.
> I'm not defending GSC nor do I own one, but to satisfy my curiosity
> I'd appreciate it if you would produce some of those cases that are
> so well documented. I couldn't find much.
> As I recall, IVO went through some very bad times and nearly closed
> the doors after some of their props shed blades. There were lots
> of stories being circulated and IVO took a real beating from the
> feeding frenzy that was spawned on the web. Fortunately, they
> recovered and they are now doing well, or at least they appear to.
> Thanks,
> Deke Morisse
> Mikado Michigan
> S5/Subaru/CAP 397+ TT
> "The aim of an argument or discussion should not be victory, but
> progress."
> - Joseph Joubert
>

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Fox5flyer
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PostPosted: Mon Sep 15, 2008 3:33 pm    Post subject: gsc props changing pitch in flight Reply with quote

Gary Walsh, perhaps?
Deke

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