Mailing List Message #67386
From: Ernest Christley <>
Subject: Re: [FlyRotary] More on new Mazda rotary
Date: Sat, 18 Feb 2023 16:27:11 +0000 (UTC)
To: Marc Wiese <>
4500 RPM.  Is that shaft or rotor?  
Cause what I'm hearing is that the 10lb rotor is going to get bumped three times per rev. And, it is going to be bumped enough to change rotor speed significantly.  With even the tiniest amount of play in the end gears, less than you'd want for operational clearances, you will end up with an unbearable high pitched squeal from the gear chatter.

Maybe the second solution solves that?  The generator turns off, and the rotors kinetic energy goes into accelerating the shaft, keeping the rotor always engaged in a forward push.

It's surprising to see that it is heavier, though.  Is that the total installation, including generators?

On Saturday, February 18, 2023 at 10:02:48 AM EST, Marc Wiese <> wrote:

Some finer points on this version of the engine that might aid aircraft usage:
1. Direct fuel injection (said to aid efficiency)
2. Plasma coated AL side housings! (Less weight)
3. Wider apex seals(?)
And it seems perhaps this entire package (perhaps minus the variable valve timing?) could fly in a hybrid aircraft form admirably? Wonder what it would all weighs-engine, electric gen, ecu package, batteries, AND a combo new prop/electric motor?


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