2x upscale corona question

[JetMechQC]

I’m working on a 2x upscale corona. The ring tail prevent the use of rail buttons, would 1/4″ launch lugs be ok to use?

[Chris LaPanse]

Why does it prevent the use of rail buttons?

Is it too small for the rail to go between the body tube and the ring fin?

If so, what size motor mount are you using? This is how I would determine whether 1/4″ is enough.

[JetMechQC]

I’m using a 38mm mmt. I don’t think ther will be enough room for the rail between the ring and the body tube. The ring is 4″ in dia and the body is 2.1″ in dia.

[Chris LaPanse]

Yeah, that is pushing it a bit.

In that case, I’d go for a 3/8″ rod. I’ve flown up to a hard hitting I motor off that, and I would probably trust a J. It should work fine for that rocket, though a rail would be preferable if it worked.

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