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09-04-2012, 06:49 AM
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Join Date: May 2010
Location: Spring Hill Fl
Posts: 734
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speculation
Or maybe because most people are right handed and would press harder on the right break ? ( Causing the Skip )
speculation
Quote:
Originally Posted by rgmwa
Looking back over the admittedly few reports and photos in this thread it seems that the buckled skin/crushed brake line compression damage has all occurred on the right side of the aircraft.
Have there been any reports of this particular combination occuring on the left side? If not, then it might be reasonable to add the load from a tank of fuel sitting on the right baggage floor to the possible list of contributing factors that others have already mentioned.
One other possible factor in all this is additional back-stick aerodynamic down load on the stabilator early in the landing run. Add in some bounce from a rough surface and some heavy braking and I'm guessing there could be some significant stresses generated on the airframe in that area.
Just some thoughts.
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09-04-2012, 07:14 AM
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Join Date: Oct 2010
Location: La Feria Texas
Posts: 3,822
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I had noticed that as well, but cannot put a cause to that effect. This may be of value in deciding just why it is happening. Some sort of instinct that makes us brake harder to the right than to the left? Puzzling to me..
Quote:
Originally Posted by rgmwa
Looking back over the admittedly few reports and photos in this thread it seems that the buckled skin/crushed brake line compression damage has all occurred on the right side of the aircraft.
Have there been any reports of this particular combination occuring on the left side? If not, then it might be reasonable to add the load from a tank of fuel sitting on the right baggage floor to the possible list of contributing factors that others have already mentioned.
One other possible factor in all this is additional back-stick aerodynamic down load on the stabilator early in the landing run. Add in some bounce from a rough surface and some heavy braking and I'm guessing there could be some significant stresses generated on the airframe in that area.
Just some thoughts.
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09-04-2012, 07:29 AM
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Join Date: Oct 2010
Location: La Feria Texas
Posts: 3,822
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Whoops, scratch that last post, in going back over the furnished photos I found this. This one happened on the LEFT side:
[IMG]  [/IMG]
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09-04-2012, 07:33 AM
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Join Date: Feb 2010
Location: Perth, Western Australia
Posts: 1,647
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Maybe, but I'm doubtful. There could be a tendancy for right handed people to brake a bit harder on the right, but you'd quickly ease up when you started to drift off the centreline and found yourself heading for the trees. Hands up any left-handed pilots who have right side damage.
__________________
rgmwa
RV-12LR 912ULS
120346
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09-04-2012, 07:37 AM
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Join Date: Feb 2010
Location: Perth, Western Australia
Posts: 1,647
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Quote:
Originally Posted by DonFromTX
Whoops, scratch that last post, in going back over the furnished photos I found this. This one happened on the LEFT side:
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OK Don. I'd call that one fairly convincing.
__________________
rgmwa
RV-12LR 912ULS
120346
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09-04-2012, 08:06 AM
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Join Date: Oct 2010
Location: La Feria Texas
Posts: 3,822
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Sure makes a mess out it for sure.
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09-04-2012, 08:36 AM
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Join Date: Oct 2010
Location: La Feria Texas
Posts: 3,822
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Another point to ponder, is the effects on braking. Almost all suffered a total closure of the brake line, meaning the brake is locked full on - or you have NO brakes on that side. You just got it on the ground after a wild landing that bent the leg back - and now you have no braking control and maybe do more damage because of that. I think I will bend my brake lines down under the leg to preclude that from happening.
[IMG]  [/IMG]
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09-04-2012, 10:10 AM
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Join Date: Nov 2007
Location: Jesup, Iowa
Posts: 1,657
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Another report - -
Looked at mine this morning. Saw nothing. Did not scrape paint off, but I think something would have shown. I have landed on turf maybe 6 - 8 times total. Normally don't brake much due to long runway we have now, and turn-off is about mid-way.
John Bender
430.6 hours
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09-04-2012, 11:49 AM
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Join Date: Mar 2011
Location: Bosschenhoofd, Netherlands
Posts: 152
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Further investigation 519
Took the wings off this morning and there was quite bit of damage on the right side only. Internally not too much damage but found the outside bolts holding the gear legs had all come loose. I could give each at least 3 full turns and i am sure they were tight and torqued before. No cracks in the channel.
Did some repair work and carried out some landing tests with a buddy with binoculars.
On the paved runway no problem even at firm braking.
On the grass strip he could see the wheels shaking back and forth when the brakes are used. The constuction as it is does however NOT allow any movement in that sense.
I am convinced this is what happened. I landed on a short downsloped grass strip and had to brake very firm to prevent dropping off the runway end.
I did not check the skin at that time.
Looking at the construction the gear legs can bend up and absorb shocks in vertical sense, but there is no way these legs can take any longditudinal forces. These can only rotate the channel beam and transmit the force into the side skin which will easily mess up.
These forces do occur on a not too flat grass strip and will be much worse when braking.
It will in my opinion the construction will cope well with a hard landing creating only vertical forces.
If you do not flare which will also create longditudinal forces the nose leg will be wiped away first.
I do not believe hard landings are the cause of this.
I looked at various landing gears and saw that often a tube is used like the nose leg which can absorb londutudinal forces by bending.
Another one with our type of legs used a vertical hinged wheel with a damper giving the same effect.
The forward aft rigidness of our legs will some time break things i think unless you always land on a paved runway and do not use the brakes on grass strips. Unfortunately you will have to brake some time or another.
I hope VAN's will look into this important issue but sofar i did not get any respons to my mails. Also requested to mail the ASME reporting form which I never received.
This issue worries me a lot and looking at the number of planes having this it requires urgent attention
__________________
Jack Netherlands
PH-SEP and PH-SES
RV12 #120519 and #120790
Hobbs 700+ hours and 400+ hours
Dual SV1000 Skyview 15, Pocket FMS and Powerflarm 6.0 (ADSB)
RV10 PH-USN Hobbs 350 hours
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09-04-2012, 12:32 PM
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Join Date: Apr 2008
Location: Riley TWP MI
Posts: 3,070
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Quote:
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Also requested to mail the ASME reporting form which I never received.
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Page 18-25 of the RV-12 MAINTENANCE MANUAL might be what you are looking for.
http://www.vansaircraft.com/pdf/revi...uals/MM-R1.pdf
Joe Gores
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