Has anyone calculated, determined, etc., the Cp for the Tintin rocket? It
is a bit unusual so I am not sure if the usual methods were accurate.
- posted 17 years ago
Tintin rocket CP
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- posted 17 years ago
Haven't done it for that particular rocket, but the later versions of
RockSim will make a reasonable job of estimating the CP of this style
(pods, curved bodies, etc) of rocket.
Alternatives:
- Find someone who already has a flying version and ask them where to put the CG.
- Swing test it!
Alternatives:
- Find someone who already has a flying version and ask them where to put the CG.
- Swing test it!
- posted 17 years ago
I've never heard of this method. Could you give a short description?
- posted 17 years ago
Sure, you tie string around the body of the rocket at the CG. Then you
swing the rocket around your head at the end of the string. If it
points forward, it's stable. Doesn't work for very big rockets, or
very long rockets.
- posted 17 years ago
I assume you should have an engine installed as well for a true stability
check?? Am I correct?
Richard
Richard
- posted 17 years ago
Yes.
- posted 17 years ago
And, more specifically, a motor that hasn't been fired yet.
- posted 17 years ago
Yes.
- posted 17 years ago
I assume you mean the Tintin Moon Rocket.
I modeled it in RockSim and got the following CP values: Barrowman .68 (.86) RockSim .70 (.88) Cutout .60 (.75) The first number in each row is the CP location as a fraction of the overall length; the second number, in parentheses, is the CP as a fraction of the airframe length. The CP is measured from the tip of the nose (NOT the tip of the nose antenna).
My model is based on the drawing in Spaceship Handbook. I didn't model the fin tip pods, except as profiles included in the fin shapes.
Here's the model if you're interested:
I modeled it in RockSim and got the following CP values: Barrowman .68 (.86) RockSim .70 (.88) Cutout .60 (.75) The first number in each row is the CP location as a fraction of the overall length; the second number, in parentheses, is the CP as a fraction of the airframe length. The CP is measured from the tip of the nose (NOT the tip of the nose antenna).
My model is based on the drawing in Spaceship Handbook. I didn't model the fin tip pods, except as profiles included in the fin shapes.
Here's the model if you're interested:
formatting link
- posted 17 years ago
Oh yeah, but be sure to stick a fuse in it and light, right before you
start swinging.
It's much more fun that way.
8D
TBerk
It's much more fun that way.
8D
TBerk
- posted 17 years ago
I'm pretty sure it isn't.
- posted 17 years ago
You just need really, really Strong string.
TBerk
TBerk
- posted 17 years ago
I'm unconvinced.
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