Working on a sim of the ARCAS, and I've got a conundrum... JimZ's scan of the instructions clearly states that the kit uses a JC-55C. The Estes 1971 catalog gives it as 1.3". OR's default gives it as 1.25", and Semroc says that a JC-55C is 1".

When it comes to this kit (the K-26) which spec is correct?

Also need to know more about the fins... Those shapes are pretty complex, and if I can get the length of the fin support pattern, I should be able to scale both fin shapes based on that.

Thanks!
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.