From: "Finn Lassen finn.lassen@verizon.net" <flyrotary@lancaironline.net>
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Subject: Re: [FlyRotary] Re: MISTRAL
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
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Date: Thu, 1 Apr 2021 13:05:09 -0400
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Thanks Ed.

What I meant to say is that Tracy implied that secondary runners should 
have a larger diameter.

But I made them the same (inside diameter) as the holes in the block (30 
mm).

Finn

On 4/1/2021 11:07 AM, eanderson@carolina.rr.com wrote:
> Smaller dia may mean that airflow velocity is higher than in the 
> primaries and since the secondary valves open at higher rpms, the 
> higher airflow velocity may help stuff more air into the chamber give 
> the shorter duration the port is open at higher rpm.  Just a WAG.
>
> Ed
>
> ------ Original Message ------
> From: "Finn Lassen finn.lassen@verizon.net" <flyrotary@lancaironline.net>
> To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
> Sent: 4/1/2021 8:48:31 AM
> Subject: [FlyRotary] Re: MISTRAL
>
>> Tracy remarked on my secondary runners being smaller diameter than 
>> primaries and now I see the same here.
>>
>> If I recall correctly, when I calculated the area of the secondaries 
>> vs the area of the primaries (in the engine block) I got smaller 
>> secondaries than primaries.
>>
>> What gives?
>>
>> Finn
>>
>> On 3/31/2021 9:44 PM, Kelly Troyer keltro@gmail.com wrote:
>>> Primary Runner length approximately........24 inches
>>> Primary Runner "OD"  approximately.........1.40 inches
>>> Secondary Runner length approximately.....24 inches
>>> Secondary Runner "OD" approximately.......1.66 inches
>>
>>
>>
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