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  #1  
Old 05-12-2014, 02:44 PM
njg8gtjoe njg8gtjoe is offline
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Default 2 stage rocket NEWBIE

i have a small 2 stage rocket.
http://www.questaerospace.com/cgi-b...action&key=3005

i'm just not sure what motors to buy. is a booster engine have -0 by default? such as c6-0 would be considered a booster engine?

thx for your help.
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  #2  
Old 05-12-2014, 02:54 PM
johnnwwa johnnwwa is offline
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Quote:
Originally Posted by njg8gtjoe
i have a small 2 stage rocket.
http://www.questaerospace.com/cgi-b...action&key=3005

i'm just not sure what motors to buy. is a booster engine have -0 by default? such as c6-0 would be considered a booster engine?

thx for your help.


Upper Stage Motors: A6-4 / A8-5/ B6-2 / B6-4 / C6-3 / C6-5
Booster Stage Motors: B6-0 / C6-0

These are suggestion for the Zenith 2.

I'd start with B6-0 to a A8-3 or A8-5

B6-0 and C6-0 are booster engines . Depending on you field size ,go with the small size motors first. Also I'd suggest you have a second person with you to keep track of the Booster while you keep you eyes on the second stage.
Have fun and welcome to the forum
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  #3  
Old 05-12-2014, 03:54 PM
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Rich Holmes Rich Holmes is offline
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Quote:
Originally Posted by njg8gtjoe
i'm just not sure what motors to buy. is a booster engine have -0 by default? such as c6-0 would be considered a booster engine?

Yes. The -0 denotes that the motor has no delay or ejection charge, just the propulsion charge which when it burns through at the front ignites the next stage. You'd always use a -0 in the booster stage.
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  #4  
Old 05-12-2014, 03:58 PM
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Earl Earl is offline
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As John said above, with a small field go with smaller motors first. Two stage rockets, unless they are fairly large, will go a fair amount higher than you might be expecting. When that upper stage ignites, they REALLY head on out fast and it's easy to loose sight of the upper stage, especially if it is kind of small.

If you can, and it's a recommended motor for the rocket, try an A8-0 to A8-3 or -5. Then if that's ok, go on up to B or C boosters.

Multi-stagers are fun, but it takes and extra eye or two to track and recover all the parts.


Earl
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  #5  
Old 05-12-2014, 04:09 PM
njg8gtjoe njg8gtjoe is offline
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thank you everyone
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  #6  
Old 05-12-2014, 05:39 PM
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luke strawwalker luke strawwalker is offline
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Correct on the -0 motors for the booster stage...

Motors for the sustainer (upper) stage(s) will sometimes have longer delays, like the C6-7, D12-7, etc... the longer delay gives a longer coast time after upper stage motor burnout for the rocket to gain maximum altitude and slow down from the high acceleration after staging during its coast to apogee...

With a kit, it's best to stick to the recommended motors until you know how it flies under your conditions... better to fly it on the smallest recommended motors to make sure you don't lose it, because stagers DO go a lot higher and faster than you think they will... once you get a "feel" for how the rocket will fly, you can always move up to larger recommended motors...

Later! OL JR
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  #7  
Old 05-12-2014, 10:53 PM
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JStarStar JStarStar is offline
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Quote:
Originally Posted by Earl
As John said above, with a small field go with smaller motors first. Two stage rockets, unless they are fairly large, will go a fair amount higher than you might be expecting. When that upper stage ignites, they REALLY head on out fast and it's easy to loose sight of the upper stage, especially if it is kind of small.

If you can, and it's a recommended motor for the rocket, try an A8-0 to A8-3 or -5. Then if that's ok, go on up to B or C boosters.

Multi-stagers are fun, but it takes and extra eye or two to track and recover all the parts.


Earl


It's also easy to lose sight of the lower stages if it's not somebody's specific job to keep an eye on it -- most people will follow the upper stage as it keeps climbing and a lower stage can drop out of sight if you're not careful.
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  #8  
Old 05-13-2014, 10:09 AM
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Joe Wooten Joe Wooten is offline
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Quote:
Originally Posted by Earl


Multi-stagers are fun,



Worse than that, they are addictive. Before long you'll want to try a 3 stager, then you graduate to the hard stuff like clustered staged rockets and parallel staged, and parallel/serial staged.

Losing multi-stagers just makes you want to build more.........
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  #9  
Old 05-13-2014, 11:18 AM
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Doug Sams Doug Sams is offline
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Quote:
Originally Posted by Joe Wooten
Worse than that, they are addictive. Before long you'll want to try a 3 stager, then you graduate to the hard stuff like clustered staged rockets and parallel staged, and parallel/serial staged.

Losing multi-stagers just makes you want to build more.........
Everyone needs to build at least one clustered staged rocket!

Doug
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  #10  
Old 05-13-2014, 01:29 PM
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Joe Wooten Joe Wooten is offline
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Quote:
Originally Posted by Doug Sams
Everyone needs to build at least one clustered staged rocket!

Doug


Yepper!

preferably using old FSI F100's or E60's to F-7's.........
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