Upscale Astron Mark

[accooper]

I wish to upscale the old Estes kit the Mark. I want to upscale it to a BT-55 using a "D" engine. My problem is that I don't know how long the BT-55 should be to really be an upscale.

Can anyone out there help me on this?

Andrew From Texas

 

[bradycros]

BT-55, 10.608659 inch in long. I'd round it off too 10.5 inch