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Old 11-24-2022, 09:07 AM
The Wizzard's Avatar
The Wizzard The Wizzard is offline
Join Date: Nov 2009
Location: Cincinnati, Ohio
Posts: 158
Default Whirlwind RV-200 Prop Hub Failure

I dropped my Prop off for overhaul this week at Whirlwind aviation in Austinburg, Ohio. I received a call from them yesterday and much to my surprise I was told the Hub was junk. It appears from the photos and phone conversation that I had with them that the race and the bearings have welded themselves to the hub. The folks at whirlwind were just as surprised as I was and stated that they had not seen anything like this before. They plan on doing some research next week into what may have caused this. In the meantime I thought I would reach out to the "airforce" for any thoughts.

Here are the facts.

1. The prop operated normally
2. 850 on prop since new
3. 800 since it was last torn down ( I sent it back to Whirlwind to have the blades repainted after 50 hrs of use. I flew through rain and the finish got stripped off! This was when the prop was new, no problems since?)
4. A couple of small overspeeds in the last 100 hours, maybe 2950 rpm at the most and as a result I sent the govenor to MT for overhaul this past summer. No problems since.

The prop was acting normal. There had been traces of oil appearing on the windshield over the last couple hundred hours but nothing alarming. I mean really small specs of oil! There was evidence of it coming out of the hub on the backside of the blades. So, lets get the prop off, get new seals and have it's recommended inspection done!

That does not explain in my opinion why the bearings failed. Any thoughts

Im looking for a Serviceable Hub as well!
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Dave Cicciari
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Last edited by The Wizzard : 11-24-2022 at 09:11 AM. Reason: grammar errors
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Old 11-25-2022, 09:08 AM
Scott Hersha Scott Hersha is offline
Join Date: Jan 2005
Location: Cincinnati, OH
Posts: 2,527

Call me. I have one. Standard McCauley, not the Whirlwind clone. 2 - blade 200RV.
RV6/2001 built 2000/sold 2005
RV8 Fastback/2008 built/sold 2015
RV4/bought 2016/sold/2017
RV8/2018 built/Sold(sadly)
RV4/bought 2019/sold2021
RV6/August 2022 build - Flying
Cincinnati, OH/KHAO
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Old 11-25-2022, 09:15 AM
rocketbob's Avatar
rocketbob rocketbob is offline
Join Date: Jun 2006
Location: 8I3
Posts: 3,881

Likely improper heat treating of the bearing races. If you could get them out the rockwell hardness can be tested on one of the other non-bearing surfaces.

Please don't PM me! Email only!

Bob Japundza CFII 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
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