Quantcast

new idea for a scratch build

The Rocketry Forum

Help Support The Rocketry Forum:

Mike Howie

Well-Known Member
Joined
Jan 18, 2009
Messages
802
Reaction score
3
Just an idea for now. It shouldn't be too hard. The main
modification I'd make is to add some fins to the bottom
tanks. I'm thinking, 3in bottom dia, with a 3 deg angle
to the top. Cluster, of course.
 

11bravo

Well-Known Member
Joined
Jan 19, 2009
Messages
2,738
Reaction score
0
That thing screams "STAGES!!!".

Greg
 

polaris

Well-Known Member
Joined
Mar 18, 2009
Messages
90
Reaction score
0
What about doing it finless? Maybe offset the tanks a little more to give a bigger flair at the bottom. Just a thought. . .
 

lalligood

Well-Known Member
Joined
Jan 21, 2009
Messages
1,975
Reaction score
0
It would work as a finless, long cone shape rocket as long as the CG is forward of 2/3 the distance from the forward tip. Cool idea to make a model of...
 

DynaSoar

Well-Known Member
Joined
Mar 15, 2004
Messages
3,007
Reaction score
0
Originally posted by lalligood
It would work as a finless, long cone shape rocket as long as the CG is forward of 2/3 the distance from the forward tip. Cool idea to make a model of...
Might need more than that as long as the tanks are tilted in towards the bottom. Kick the aft out to one side, and the drag at the aft end on that side becomes less while the whole-body "base drag" becomes greater on the other side. It'd tend to loop.

But, get it going fast enough for base drag overall to keep it straight and it may work.

OR: have the tops of the tanks open? Tube rocket?

Goferit!
 

Mike Howie

Well-Known Member
Joined
Jan 18, 2009
Messages
802
Reaction score
3
When I built my N-1, I had to have the motor recessed quite a bit
or a prohibative amount of nose weight to get it stable. Same
thing for the Sprint. That's why is was going with the extra fins.
Tube fins... I didn't even think of that.
 

Mike Howie

Well-Known Member
Joined
Jan 18, 2009
Messages
802
Reaction score
3
here it is. I still haven't found my copy of ROCSIM yet, to check
the stability. I think it looks pretty good. Much better than the
pic.
 
Top