Tau Pi-Y
This is an old RS8 design re-done in RS9 as you can see, it looks a whole lot better in RS9
Length: 571.14 mm, Diameter: 41.66 mm, Span diameter: 224.86 mm
Mass: 98.268 g, Selected stage mass 98.268 g
CG: 426.49 mm, CP: 476.36 mm, Margin 2.59 (no motor)
Engines -- B4-4, B6-4, C6-5
There my be a bug in RS9 with it's calculation of Velocity at Deployment .
The numbers I was getting of this design don't mach the number in RS8.
And as this has flown on the above engines.