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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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