flyrotary@lancaironline.net Mailing List Archive

Kelly, I did get the rotor's used and they appeared in good shape. But, that could have simply been my lack of knowledge what to really look for such as - slop in the apex seal slot. I was using the rotor housings that came with the core as they appeared to be in good shape. But even though I have not yet found any damage to the rotor housings, that one rotor clearly had a piece of apex seal jammed between the rotor housing inner surface and the rotor - hard to believe it damaged the rotor but not the housing. Need to do some cleaning of parts for better assessment.

----- Original Message -----

From: Kelly Troyer

To: Rotary motors in aircraft

Sent: Tuesday, April 12, 2005 11:35 PM

Subject: [FlyRotary] The Final? story on the engine problem

Ed,

Sure looks familar.......I spent the day taking a 89-91 core engine apart

to recover one good 9.7 to 1 rotor......Other rotor suffered apex seal failure

(stock 3 piece seals).......Rotor looks alot like yours.......Rotor hsgs are shot

.......End hsgs serviceable but should probably be lapped.......It has taken

two core engines to get two good 9.7 rotors.......Such is life !!

--
Kelly Troyer
Dyke Delta/13B/RD1C/EC2

-------------- Original message from "Ed Anderson" <eanderson@carolina.rr.com>: --------------

Second set of photos

Photo Apex Scrapes shows that the ejected apex seal piece probably made it around the chamber a couple of times, one impression looks to be smaller than the width of the ejected piece - so perhaps it broke up further in its round.

Photo Apex Slot Peened shows that the 2nd apex seal of #1 rotor that would not move up and down - clear why, now. The departing piece peened over the slot and froze the seal in its slot. I had to pry the opposite end of the seal up to the position you see.

Ed Anderson
Rv-6A N494BW Rotary Powered
Matthews, NC
eanderson@carolina.rr.com