I'm a fan of upscaling/downscaling classic rockets to the BT-60, but sometimes it's a PITA to remember what one body tube would scale up (or down) to. So, I decided to create this chart. Percentages are rounded to the nearest 1/100th.



So, if you wanted to upscale a BT-55 to a BT-60, you would take your original's length (say 18") and multiply it by 1.2355 (123.55%) and that gives you a length of 22.239" (about 22 1/4").

Hope this helps!
Jim
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Dreaming of making the rockets I dreamed of as a kid (and then some).

"The Guide says there is an art to flying", said Ford, "or rather a knack."
"The knack lies in learning how to throw yourself at the ground and miss."

Launching is Optional... Landing? That Depends on Trees.

Thanks... handy to have...

Here's one that covers practically every tube size you can think of...

Enjoy! OL JR

Attached Files

BodyTubeRatios.pdf (17.4 KB, 82 views)

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I am partial to building everything in the same scale. The hardest part is finding commercially available tubes in the right sizes. It just so happens that upscaling by 1.67 is one of those magic ratios:

BT-5 0.544" -> 0.908" T-.908" (ST-8)
BT-20 0.736" -> 1.229" T-52H (29mm motor mount tube)
ST-8 0.908" -> 1.516" T-40 Quest
BT-50 0.976" -> 1.630" BT-60
ST-10 1.040" -> 1.737" ???
BT-55 1.325" -> 2.213" BT-70
BT-56 1.346" -> 2.248" T-70H
BT-60 1.637" -> 2.734" Semroc ST-27 or LT-275?
ST-20 2.042" -> 3.410" ??? Estes Mercury Atlas size
BT-70 2.217" -> 3.702" BT-100


Bill

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