flyrotary@lancaironline.net Mailing List Archive

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Rusty, My rotor housings did have chatter marks - although they did not appear as severe as the ones looked in Chuck's photos. My housings on the other hand were the ones that came with the core engine - pre-owned or used in other words. However, I did check them out pretty carefully and am certain I would have noticed any chatter marks. Wish I had know about the slot wear specs and had checked the used rotors as carefully.

Probably several things contributed - none of which by themselves would cause the problem, but have two or three occur and "Pow"!.

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

From: Russell Duffy

To: Rotary motors in aircraft

Sent: Thursday, March 16, 2006 9:10 AM

Subject: [FlyRotary] Re: Motor teardown results

I now have Tracy's 2 piece apex seals and I wonder how they will perform, it appears that the heavier weight of the 2 piece seals puts the resonant frequency in the cruising range of 6000RPM?

Interesting report Chuck. I would think any sort of rotor bouncing would be more of a spring problem than a seal problem. What springs are you using for the apex seals? Were they new, proper amount of curvature, big and small spring for each seal? Just seems odd that no one else has been seeing these chatter marks like you have.

It will be interesting to see if your apex seal grooves are worn as Ed mentioned. Ed, was your housing full of chatter marks?

Cheers,

Rusty

PS- Hoser from the urban dictionary for George (not translated into any dialect)

http://www.urbandictionary.com/define.php?term=hoser