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From: "George Lendich" <lendich@optusnet.com.au>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
References: <list-2723381@logan.com>
Subject: Re: [FlyRotary] Re: Rotor Weight Codes
Date: Mon, 11 Feb 2008 08:13:29 +1000
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Dale,
I had a look at that web site and found it very interesting. When playing 
with Rotor shapes ( some time ago on AutoCAD)I found the Rotor is made up of 
a Reuleaux triangle/polygon.
Just putting a name to the shape, for those interested.
George( down under)

> Ernest Christley wrote:
>> OK.  You caught me.
>>
>> I always thought there was some back and forth motion in that rotary 
>> rotation.  But I've just spend the last few minutes staring at 
>> http://www.keveney.com/Wankel.html
>>
>> There has to be some recipricating motion.  If there wasn't, the apex 
>> seals would all trace a perfect circle.  I should go to bed.
>>
>
>
> Not reciprocating.  There is acceleration and deceleration; and the 
> vectors are complex - the e-shaft makes a complete rotation every time a 
> new face of the rotor is presented to the spark plugs.  Think of it like 
> being in slow-and-go traffic on the freeway - you keep going forward, but 
> sometimes not by much.  In fact, the path of the valve stem on your wheel 
> as you roll down the freeway is a "classic" trochoid.
> Take a look at: http://mathworld.wolfram.com/Trochoid.html
>
> Dale R.
> COZY MkIV  #0497
> Ch. 13
>
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