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  #21  
Old 11-21-2012, 06:01 AM
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rocketbob rocketbob is offline
 
Join Date: Jun 2006
Location: 8I3
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Quote:
Originally Posted by Lars View Post
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...
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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Last edited by rocketbob : 11-21-2012 at 06:03 AM.
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  #22  
Old 11-21-2012, 10:14 AM
Lars Lars is offline
 
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Quote:
Originally Posted by rocketbob View Post
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
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.
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  #23  
Old 11-22-2012, 01:47 PM
Pilottonny Pilottonny is offline
 
Join Date: Jan 2006
Location: Belgium
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Default 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.
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Lanaken, Belgium (EU)
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ECI-Titan IOX-320 with dual EI, turning a Whirlwind 200RV CS prop.
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  #24  
Old 11-22-2012, 02:14 PM
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Andrew M Andrew M is offline
 
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Default 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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  #25  
Old 11-22-2012, 03:28 PM
prkaye prkaye is offline
 
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Quote:
As far as comparing them to auto bearings, tough to do. Landing loads are something a car is not likely to experience.
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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  #26  
Old 11-22-2012, 04:32 PM
Lars Lars is offline
 
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Originally Posted by Andrew M View Post
(snipped) Landing loads are something a car is not likely to experience.
Come with me for a ride in my old Ford Bronco some time

Happy Thanksgiving!
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  #27  
Old 11-22-2012, 05:01 PM
mtnflyer mtnflyer is offline
 
Join Date: Jul 2007
Location: granby co
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Default 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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  #28  
Old 11-22-2012, 05:33 PM
skybolt31 skybolt31 is offline
 
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Location: Westfield, MA
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Quote:
Originally Posted by prkaye View Post
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.
Also, the rpm of the airplane wheel at 60kts is much greater than an automobile wheel given the much smaller diameter.
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  #29  
Old 11-23-2012, 03:00 AM
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NickAir NickAir is offline
 
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Default 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.
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  #30  
Old 11-24-2012, 12:10 AM
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PerfTech PerfTech is offline
 
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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..
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