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Bruce is as great fellow to do business with based on my experience. Since I elected not to have either done on my engine, I can't comment on their value. Perhaps if I had the rotors ceramic coated the coolant temps would be higher and oil temps lower but, my oil temp was at 160-180F and my coolant temps were at 200-210F, so I don't think ceramic coating would have done me much good. My understanding is that it shields the rotors more than any other component from the heat of combustion - so would probably help keep oil temps cooler.
If you are going to wind your engine past 8000 rpm then dynamic balancing might have merit - otherwise my experience with 3 rotary engines is if you use the correct counter weights for the weight of the rotors you are using - you don't need to have it dynamically balanced.
On the other hand, if you have the time and money - why not?
Ed
----- Original Message ----- From: <davidclifford01@comcast.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Monday, May 02, 2005 9:41 AM
Subject: [FlyRotary] Re: Renesis Build Options
Before I send a 50% deposit to East Coast Rotary to have Bruce build my engine, he offers two options during the build, ceramic coating the rotors @$310 and dynamic spin balancing the engine rotating assembly to within +- 1g true @$350. Any thoughts, concerns, or comments on these options would be appreciated as I am sending payment this week. Thanks everyone. Dave
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