To simulate the effect of canted motors on a model rockets flight visit Apogees Peak of Flight Newsletter #226 "The Effect on Altitude from Canted Rocket Engines" by Tim Van Milligan https://www.apogeerockets.com/educa...wsletter226.pdf . A cant angle of only 2 or 3 degrees in the motor mount tubes will not make much difference in the flight chracteristics and it is probably not worth going through the trouble of creating the custom engines for the flight simulation.

To get the templates for the centering rings for canted motor mounts you will need 2 simulations; one with the motor tubes placed at the distance they will be at the top of the canted cluster where the forward centering is to be located and a 2nd simulation with the motor tubes placed at the distance apart in the mount where the aft centering ring is located. Then just print the forward and aft centering ring templates from the appropriate simulation.

By the way, you don't have to fly the same motors in each tube of the cluster. I have flown my FlisKits Deuces Wild with Estes C6-5 and B6-6 motor combination many times, all I did was match the sustained thrust and the total motor duration (thrust phase plus delay time). This should also work for the D12-5, E9-4 and the D12-7, E9-6 motor combinations, but I haven't tried these yet. http://www2.estesrockets.com/pdf/Es...rust_Curves.pdf

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Bruce S. Levison, NAR #69055