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Upscale Astron Mark

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accooper

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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

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