What dimensions did you use and calculate for?

Also, in practice can you get a feel for a sweet RPM spot to compare= with the calculations?

Thanks

Steve Izett

On 02/01/2011, a= t 8:22 AM, Dennis Havarlah wrote:

Happy New Rotary Year to everyone.

Steve,

I've had a real hard ti= me understanding the timing in some of the Mazda papers because they say &n= bsp;X deg. before TDC and than the next line will say Y deg. before BDC.&nb= sp; I believe they are referencing TDC on the compression stroke and = than BDC on the intake stroke! Of course if you can = determine how much the rotor turns in degrees the "E" shaft is just 3 times= as much.
&nb= sp;
When you are determining the = time available for a FAW wave to travel from the closing of rotor #1'= s intake to the closing of rotor #2's intake the rotors turn 60 deg. a= nd the "E" shaft turns 180 deg. You asked how far open should the int= ake on rotor #2 be when the FAW arrives - I do not know - but I'd want it t= o arrive when the intake is still 50% or more open. With the rotor an= d intake geometry that Mazda uses, the intake goes from almost full open to= closed with very few degrees of rotation of the rotor.

Dennis Haverlah

----- Original Message -----
From: stevei@carey.asn.au
To: Rotary motors in aircraft
Sent: Saturday, January 01, 2011 7:1= 6 AM
= Subject: [FlyRotary] = Intake manifold for 4 port Renesis

Happy New yea= r everyone.

I noted Dennis H= averlah had re worked his intake and I wondered who on the list has done th= e math.
I've done it myself using Mark Warners "Str= eet Rotary", however I don't know enough about when the reflected wave shou= ld arrive optimally at the open port of the next rotor intake event?=
Should it arrive when the port is at its most open state = or latter?
Also, can someone explain to me the timi= ng in degrees of E-shalf rotation between TDC and BDC (sorry if that is a d= umb question).

Many th= anks again to all on the list.

Steve Izett
Pe= rth, Western Australia

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