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01-12-2011, 12:29 PM
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Join Date: Dec 2005
Posts: 976
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While you've got that picture there Mike, an article in our latest LAA magazine refers to cracks found in the RV-10 engine / nosegear mount on a 150hr example.
It says "Vans are working on a small design change here to prevent further cracking" so Vans seem in the loop on it - whether they've passed it on I do not know?
The aircraft can continue flying for now, monitoring, but when the repair is done, engine / mount will need to come off. The crack, I think, is at the top of that bunch of black rubber spaces, between the struts / at the base of the larger circular assembly.
Andy
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01-12-2011, 01:37 PM
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Join Date: Jun 2006
Location: Delaware, OH (KDLZ)
Posts: 4,196
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Quote:
Originally Posted by Andy Hill
While you've got that picture there Mike, an article in our latest LAA magazine refers to cracks found in the RV-10 engine / nosegear mount on a 150hr example.
It says "Vans are working on a small design change here to prevent further cracking" so Vans seem in the loop on it - whether they've passed it on I do not know?
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Andy,
Please post a link to the article. As a RV-10 builder you just got my attention, since I've not heard of this issue previously.
thanks,
bob
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01-12-2011, 02:02 PM
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Join Date: Jul 2007
Location: Pembrokeshire, UK
Posts: 224
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Hi Bob
I have scanned the article - sorry about the blurred left edge but you get the gist.
Bob
www.rv-8.co.uk
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01-12-2011, 02:08 PM
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Join Date: Dec 2005
Posts: 976
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Quote:
Andy,
Please post a link to the article
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I was going to say the LAA is stuck in the paper age, but see that is slightly unfair...
It will appear in the Jan 11 'Safety Spot' here LAA Link "soon"...
When they publish it there, hopefully Bob can delete his post before they lock him up for breach of copyright
Andy
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01-12-2011, 04:07 PM
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Join Date: Nov 2009
Location: Yardley, PA
Posts: 1,334
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Agree with Mike
I think a RV-10 style nose gear would be a big improvement.
Is it my imagination or does this nose gear failure seem to be less frequent in the RV9A? If true, do you think this is due to slower landing speed? Maybe there are just a lot more 7s out there and it's a statistical thing.
T.
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01-12-2011, 07:35 PM
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Join Date: Oct 2005
Location: Melbourne, Australia
Posts: 1,868
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RV take-off and landing video
I have argued for many years that the Vans two-place nose gear design is deficient in that it is best suited for lighter loads and is struggling to cope with the loads now associated with increased gross weights, bigger engines, and heavier constant speed props.
However I also recognise that many RV pilots have take-off and landing techniques that are not suitable for a nose gear RV. Many pilots simply do not keep the nose gear off the ground for as long as possible during take-off and landing. They are asking for trouble.
This is a URL to a 5 minute HD video of RVs taking off and landing shot by Doug Reeves (a very good video).
http://www.youtube.com/watch?v=kWYxU83KmZo
There is only one nose gear RV in this video (an RV8A). I would ask you to go to the 1.05 minute mark on the video to see it take-off. And then go to the 2.25 minute mark to see it land.
This is the type of flying technique that puts very large stresses on the nose gear and greatly increases the probability of nose gear failure. People can learn something from this video.
__________________
You’re only as good as your last landing 
Bob Barrow
RV7A
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01-12-2011, 07:47 PM
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Join Date: Jan 2005
Location: Round Rock, TX
Posts: 3,778
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Bob,
You would be correct in that the nose wheel is a TAXI wheel, and in NO way a MAJOR load bearing wheel or any part of the TRUE LANDING gear.
Quote:
Originally Posted by Captain Avgas
I have argued for many years that the Vans two-place nose gear design is deficient in that it is best suited for lighter loads and is struggling to cope with the loads now associated with increased gross weights, bigger engines, and heavier constant speed props.
However I also recognise that many RV pilots have take-off and landing techniques that are not suitable for a nose gear RV. Many pilots simply do not keep the nose gear off the ground for as long as possible during take-off and landing. They are asking for trouble.
This is a URL to a 5 minute HD video of RVs taking off and landing shot by Doug Reeves (a very good video).
http://www.youtube.com/watch?v=kWYxU83KmZo
There is only one nose gear RV in this video (an RV8A). I would ask you to go to the 1.05 minute mark on the video to see it take-off. And then go to the 2.25 minute mark to see it land.
This is the type of flying technique that puts very large stresses on the nose gear and greatly increases the probability of nose gear failure. People can learn something from this video.
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__________________
Reiley
Retired N622DR - Serial #V7A1467
VAF# 671
Repeat Offender / Race 007
Friend of the RV-1
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01-12-2011, 08:00 PM
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unqualified unfluencer
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Join Date: Jan 2005
Location: Highland Village, TX
Posts: 4,088
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Quote:
Originally Posted by Captain Avgas
snip...And then go to the 2.25 minute mark to see it land.
This is the type of flying technique that puts very large stresses on the nose gear and greatly increases the probability of nose gear failure. People can learn something from this video.
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I respectfully disagree.
I think if you go back and look at the landing again you'll see that there is daylight between the nose wheel and the ground for almost all of the high speed part of the rollout. The nosewheel may have momentarily scuffed a high spot in the pavement, but only hard enough to gently start the wheel spinning. I have a unique perspective for this particular 8A's landings, as I keep my RV hangared right off the bravo turnoff (midpoint) on this runway. I have seen it land dozens of times, always with the nosewheel held an inch or so off the pavement. Kay is very good at landing, as he is retired and flies it nearly every day.
In this particular landing Kay was carrying a little more speed because there were other aircraft from the formation flight landing just behind him. This resulted in a slightly faster rollout, so the wheel was probably only 1 inch or less above the surface. And since it was around 1,500 feet away from me, the lens doesn't pick up this level of detail.
Kindest,
Doug Reeves
(the guy who shot the video - and playing the video back on a large screen TV absolutely shows daylight between the nosewheel and the pavement - but only about an inch)
__________________
Doug Reeves (your host) - Full time: VansAirForce.net since '07 (started it in '96).
- Part time: Supporting Crew Member CAE Embraer Phenom 300 (E55P) @ KDFW.
- Occasionally: Contract pilot (resume).
Last edited by DeltaRomeo : 01-12-2011 at 08:25 PM.
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01-12-2011, 08:49 PM
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Join Date: Jun 2005
Posts: 3,275
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My view is that many of these incidents involve hitting a pothole, landing in turf and sinking into the ground etc.
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01-12-2011, 08:57 PM
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Join Date: Oct 2005
Location: Melbourne, Australia
Posts: 1,868
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Quote:
Originally Posted by DeltaRomeo
I respectfully disagree.
I think if you go back and look at the landing again you'll see that there is daylight between the nose wheel and the ground for almost all of the high speed part of the rollout. The nosewheel may have momentarily scuffed a high spot in the pavement, but only hard enough to gently start the wheel spinning. I have a unique perspective for this particular 8A's landings, as I keep my RV hangared right off the bravo turnoff (midpoint) on this runway. I have seen it land dozens of times, always with the nosewheel held an inch or so off the pavement. Kay is very good at landing, as he is retired and flies it nearly every day.
In this particular landing Kay was carrying a little more speed because there were other aircraft from the formation flight landing just behind him. This resulted in a slightly faster rollout, so the wheel was probably only 1 inch or less above the surface. And since it was around 1,500 feet away from me, the lens doesn't pick up this level of detail.
Kindest,
Doug Reeves
(the guy who shot the video - and playing the video back on a large screen TV absolutely shows daylight between the nosewheel and the pavement - but only about an inch)
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Doug, you must have much better eyes and equipment than me. And I admire your willingness to defend a friend.
However what I see is the aircraft accelerate on take-off and the nose gear is firmly planted until rotation (typical spam can take-off).
On landing I see the nose gear positively contact the runway less than 1 second after the mains which indicates a very flat landing (typical spam can landing).
I'll have to take your word for it that there may be some sliver of daylight under the tire for some period after the first nose wheel contact but I'd be quite comfortable in saying that Mike Seager would not regard this take-off or landing as an illustration of best RV(A) practice in virtually nil wind conditions. Others may form their own opinion.
__________________
You’re only as good as your last landing 
Bob Barrow
RV7A
Last edited by Captain Avgas : 01-13-2011 at 03:19 AM.
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