Mailing List flyrotary@lancaironline.net Message #20685
From: Ken Welter <rotary.coot@verizon.net>
Subject: [FlyRotary] Re: All Parts have arrived, Whew!
Date: Sat, 23 Apr 2005 14:36:35 -0700
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
[FlyRotary] Re: All Parts have arrived, Whew!
  I have found that a milled out rotor seams to wear out and get sloppy after about 400 hrs but then again I am pushing near 300 hp on nitrous for water takeoff which may increase the wear but I think its worth it to salvage a shot rotor do to the new cost.
 If its a good 2mm rotor I would run Tracy's seals and then if the slots wear out after several hundred hrs then mill them out it the 3mm to get more life out of them.
 
 I also think that Ed's problem is form a foreign object or more likely a combination of brittle seals in sloppy grooves where if he had Tracy's seals it may have survived until the compression got bad and he were forced into a rebuild.
 I have also run the same 2mm seals from Atkins that Ed was running and have seen chaffing on the sides with very low time where with the factory 3mm seals even when the grooves got very worn and sloppy there was no chaffing on the sides.
 I also like the 3mm seals with the nitrous I am running but I think the best combination would be to run new 84-85 GSELE rotors and 3mm seals from Tracy if he starts making them which I am sure will happen in time.
 Ken



I guess we'll just have to wait on someone trying these seals in similar (now thought of as worn out ?) rotors and see what develops. Any volunteers ?  I think the 3mm slot idea sounds good, too, if you are really worried. Like most everyone else, probably, I hope there is another way. I probably don't have a good rotor in the bunch and find new cost rather exorbitant. 
 
Maybe it was just a high-flying tough bug ? <g>
 
jofarr, soddy tn
----- Original Message ----- From: Finn Lassen

Well, if it were the brittle seals breaking then we should be safe with Bruce's & RWS's seals, even with excessive wear.

I just hate a major failure like that without a positively identified cause.
 

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