Hi Gordon,
The answer I give you is going to be somewhat sketchy ... for a while at least.
A complete equipment selection method will take pages. It's coming!
You need 125 Watts per lb to fly the Pattern, and you really want 150 Watts per lb.
If you are looking at a 64 oz airplane, that means 550 to 600W.
Let's assume you want to use a 4-cell battery. They have a voltage, under load, of about 14.4V.
To get 600W, the average current (in the air) will need to be (600/14.4 or ) 42 Amps.
I'll round to 40 Amps. We fly for 6 minutes (1/10 hour) so this will consume 4 Amp-Hours of battey capacity.
Since you never want to run the battery below 80% of charge, this means that you need a 5 A-H battery.
There are high-rate discharge 4.6 A-H batteries that will also suffice.
Now you need to pick a motor. First, they are rated by wattage.
For purposes of weight reduction, you want to push the motor fairly close to its limits.
The AXI 2826/10 is already at its limits at 450W, so you need to look for a bigger one.
Sometimes you need to look at the data sheet and do a calculation based on the max current and the voltage figure out the rated wattage.
Then you look at the Kv and voltage and get a predicted maximum RPM. (Kv X V)
You will end up running at about 70% to 80% of that max imum possible RPM, under load.
Then you need to figure the pitch to get the needed speed (about 55 MPH or 80 feet per second).
The timer would then be set to give a control pulse width to set the governor in your Castle Phoenix 45 to the desired RPM.
Then you change RPM for lap time and prop diameter (starting small) until you consume 4 A-H.
The big thing is the governor circuit in the Phoenix. You can get constant lap times throughout the flight.
For planes around 60+ ounces, you might look at Kim Dougherty's setup, that he flew at the Worlds in Valladolid.
I don't know the details, but I hear it worked just great for that size ship.
later,
Dean