Going from 8” diameter to 12” - RockSim?

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Rail Dawg

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I’m going to build 2 rockets. One is an 8” kit and the other will be a scratch-built 12” with the same design as the 8” one.

I’m not well-versed with RockSim but do plan on using it.

That being said what do you think would be the rough size increase in the fin size going from a rocket that is 8” diameter 12-feet long to one 12” in diameter 20-feet long?

Is using RockSim for such a change pretty straight forward?

Thanks.

Chuck
 

tfish

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roughly each measurement of the 8" fin will be 1.5 times bigger/longer ?

Tony
 

Rail Dawg

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That’s what I’m thinking Tony.

But was wondering if there’s more to it than that?

Of course RockSim can help but there’s a steep learning curve with that software. At least I think there is...

I’ve always built my rockets without using RockSim. Just want to make sure I’m not making a fatal error if I build this one without it lol.

Going to fly the 12” with a “P” motor. I guess I need to get into RockSim?

Any inputs appreciated.

Chuck
 

rharshberger

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Does RocSim not have a scaling feature like OpenRocket? I don't use RocSim unless forced to do so but iirc it has the ability to scale the whole or just a part of a rocket.
 

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