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11-21-2012, 06:01 AM
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Join Date: Jun 2006
Location: 8I3
Posts: 3,564
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Quote:
Originally Posted by Lars
Bob, are those camlock receptacles I see in that photo? Got any more pix? Would love to see hi-res versions if you don't mind. Imitation being the sincerest form of flattery, and all that...
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Yep they are camlocs. Since the support loads are entirely carrried by the back half, I used camlocs on the front so it can come off quickly.
Here are some old pics that don't show the intersection fairings which are now a part of the wheelpants.
https://picasaweb.google.com/1087255...Lil3-T8krfg2AE
__________________
Please don't PM me! Email only!
Bob Japundza CFI A&PIA
N9187P PA-24-260B Comanche, flying
N678X F1 Rocket, under const.
N244BJ RV-6 "victim of SNF tornado" 1200+ hrs, rebuilding
N8155F C150 flying
N7925P PA-24-250 Comanche, restoring
Not a thing I own is stock.
Last edited by rocketbob : 11-21-2012 at 06:03 AM.
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11-21-2012, 10:14 AM
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Join Date: Nov 2005
Location: Davis, CA
Posts: 1,156
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Quote:
Originally Posted by rocketbob
Yep they are camlocs. Since the support loads are entirely carrried by the back half, I used camlocs on the front so it can come off quickly.
Here are some old pics that don't show the intersection fairings which are now a part of the wheelpants.
https://picasaweb.google.com/1087255...Lil3-T8krfg2AE
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That's a really cool solution, thanks for sharing. I have some ideas on how to adopt that inner bracket concept to the one-piece axles on my -7. Will make for a fun project.
__________________
Lars Pedersen
Davis, CA
RV-7 Flying as of June 24, 2012
960+ hours as of June 30, 2020. Where did the time go?
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11-22-2012, 01:47 PM
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Join Date: Jan 2006
Location: Belgium
Posts: 645
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0,06%
Hello,
For those that are repacking (re-greasing) their bearings at every anual inspection (lets say every 50 hrs): My last car did approx. 350.000 km with the same bearings without any service, at all.
OK, they were probably of better quality and of different type than the bearings on the RV, but @ approx. 100 landings/year, times average 1 km of taxi per landing, times 2 for take-off and landing, the RV is doing approx. 0,06% of the distance per year that my car did, at a lot higher speeds, a lot higher loads and at lot harsher conditions than the RV.
I check the wheels for play and resistance (free running) every time the wheels come off the floor (at least ones a year). Unless I find anything out of the ordinary, or excessive grease on the wheels, I do not plan to regrease the next 10 years or so........
Regards, Tonny.
__________________
"Pilottonny"
Tonny Tromp
Lanaken, Belgium (EU)
RV9A, Registration: PH-VAN
ECI-Titan IOX-320 with dual EI, turning a Whirlwind 200RV CS prop.
Sold
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11-22-2012, 02:14 PM
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Join Date: Aug 2006
Location: Secluded Lake,Alaska (AK49)
Posts: 359
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Inspections
This is what I did as the D.M. sole mechanic for 4 airplanes, each flying about 3 or 4 hundred hours a year.
Disassemble, clean, detailed visual and tactile inspection, service and assemble. This is done at annual, in the winter when the airplanes are parked. At 100 hour, jack airplane, pull the brake pads if needed, inspect for looseness, roughness. Then using a screwdriver on end on the axle, the other on my ear, I would spin the tire and listen. If the cub had been doing some off airport work and the bearings became contaminated, I could hear it. My point being, with a little experience in listening, a good inspection can be done in very little time. It is not a substitute for a detailed inspection, but can quickly help a mechanic determine if further investigation is warranted.
As far as comparing them to auto bearings, tough to do. Landing loads are something a car is not likely to experience.
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11-22-2012, 03:28 PM
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Join Date: Jun 2006
Location: Ottawa, Ontario, Canada
Posts: 2,116
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Quote:
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As far as comparing them to auto bearings, tough to do. Landing loads are something a car is not likely to experience.
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Indeed - an aircraft wheel accelerates from a dead stop to about 60kts in an extremely short time interval (fraction of a second?). And it does so often when the bearing grease is quite cold, having been sitting in a stationary wheel at altitude.
__________________
Phil
RV9A (SB)
Flying since July 2010!
Ottawa, Canada
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11-22-2012, 04:32 PM
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Join Date: Nov 2005
Location: Davis, CA
Posts: 1,156
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Quote:
Originally Posted by Andrew M
(snipped) Landing loads are something a car is not likely to experience.
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Come with me for a ride in my old Ford Bronco some time
Happy Thanksgiving!
__________________
Lars Pedersen
Davis, CA
RV-7 Flying as of June 24, 2012
960+ hours as of June 30, 2020. Where did the time go?
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11-22-2012, 05:01 PM
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Join Date: Jul 2007
Location: granby co
Posts: 180
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You may take this and run with it
Many years ago, while working for a Kenworth dealer, I was taught to clean bearings with solvent, getting all the old grease out, then washing these bearings with very hot, soapy water, blowing them out with air. DO NOT SPIN THEM. And then packing with a good quality grease.. The RV 4 I built and flew in 1992 has over 1600 hrs and still has the same bearings and they still look like new.... Dave
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11-22-2012, 05:33 PM
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Join Date: Jan 2009
Location: Westfield, MA
Posts: 76
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Quote:
Originally Posted by prkaye
Indeed - an aircraft wheel accelerates from a dead stop to about 60kts in an extremely short time interval (fraction of a second?). And it does so often when the bearing grease is quite cold, having been sitting in a stationary wheel at altitude.
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Also, the rpm of the airplane wheel at 60kts is much greater than an automobile wheel given the much smaller diameter.
__________________
Bruce Green
Eagle N110GM
Westfield, MA
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11-23-2012, 03:00 AM
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Join Date: Nov 2008
Location: McMinnville, Oregon: HOME of the SPRUCE GOOSE
Posts: 540
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Wheel Bearings
It only takes 20 minutes to clean and repack the wheel bearings even by hand. The process of cleaning the bearings allows thorough inspection. Simple, quick and cost effective. These OEM type tapered bearings will last longer than you want the plane if kept clean with good grease.
I do like Allan's sealed bearing modification.
A better purpose design, my opionion.
__________________
Tailwinds...
Simplicity is the ultimate sophistication.
Leonardo Da Vinci
Working on a RV-4
Citabria 7GCBC
Cessna 180
RV7 I0-360 C/S, Slider, AP, Glass, etc. sold.
RV6 O-320 F/P, Slider, AP, Steam, etc., sold
Citabria 7KCAB rental
Piper Cherokee, sold
Sparrowhawk, sold
Proud -VAF- Supporter - Exempt, Dues Paid Anyway.
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11-24-2012, 12:10 AM
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Join Date: Sep 2010
Location: Redlands, Ca.
Posts: 1,458
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.....We never need to re-pack ours!!!!!!!
After the bearing modification you are good for 100K miles on the ground. Allan..  
__________________
Allan Nimmo
AntiSplatAero.com
Innovative Aircraft Safety
Products, Tools & ServicesInfo@AntiSplatAero.com Southern California (KREI)
RV-9A / Edge-540 
(909) 824-1020
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