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mbeach(at)hartwigs.com.au
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 Posted: Sun Jan 15, 2006 6:28 pm Post subject: frozen Prop blades |
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Lades and Gents
A couple of weeks ago I put a note on the yak list regarding frozen prop blades (unable to adjust pitch)
I can now advise you of the findings the prop has been striped and inspected we found the sleeves that the blade
Screw into had frozen on the nylon bush just after the oil/grease seal.
It took a considerable amount of work to remove the castellated nuts and one could not be removed with out totally stripping
Of the centre of the hub.
My question to the list has any one ever had this type of failure, do you all leave your props parked on the horizontal so water can not enter the bushing area. This CJ sits in a hanger it had been flown in rain once and only gets washed using car wash
It has not had any other types on solvents near it.
Any thoughts or comments would be appreciated
Mike Beach
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dsavarese(at)elmore.rr.co
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| Posted: Mon Jan 16, 2006 5:07 am Post subject: frozen Prop blades |
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Michael,
I have definitely seen this problem. Unfortunately, it was caused by leaving the airplane parked outside with the prop in other than the horizontal position for months. Rain water will run into the hub. The hub was so bad we were unable to remove the castellated nuts, even with a 3 foot leverage bar attached to the handle of the spanner wrench and a 230 LB person pulling on it. Once disassembled by a prop shop, serious corrosion was found and the hub was virtually unusable and had to be scrapped.
Although I am clearly not an expert on car wash soaps, some soap may have entered the hub and if the airplane was not flown immediately after washing, the soap may have begun attacking the metal. Also, don't discount the history of the hub prior to your ownership or even before that.
Dennis
[quote] ---
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