Mailing List flyrotary@lancaironline.net Message #62477
From: James R. Osborn <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Plug hole losses
Date: Thu, 19 May 2016 11:39:18 -0700
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
That video has been circulating for a few years.  It is pure BS in my opinion.  I agree Lynn, no clue.

— James


On May 18, 2016, at 12:45 PM, Lehanover <flyrotary@lancaironline.net> wrote:

From:
 
 
 
 
 
Subject: Slits replace spark plug holes?
Date: Thu, 28 Apr 2016 20:36:45 +0200
To: Rotary Motors in Aircraft <flyrotary@lancaironline.net>
The host’s voice on this video makes it hard to take it seriously; but I wonder if the racing guys have experimented with either of the two ideas presented…?

https://www.youtube.com/watch?v=m3pCLjHZmhM

Doug Lomheim
RV-9A 13b; FWF
 
While the apex seal does cross the trailing plug hole and the leading plug hole during compression, the time period of exposure is nil even during starting. Far less when running. So, looking for a power increase with modifications here is not productive.
 
Fuel consumption per horse power hour is not far off of a piston engine at the same test HP. So, not much to be gained with more compression. Every fire slot shape has been tried by Mazda and many racers already and there is little to be had over the stock shape. The engines tune like 2 cycle dirt bikes. Responding to exhaust lengths/back pressure and inlet lengths. Usually can turn over 9,000 without damage and never throws a rod through the case. The "inventer" does not have a clue.
Lynn E. Hanover 

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