08-05-2006, 10:59 PM
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BARCLONE Rocketry
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Join Date: Mar 2005
Location: Mobile, Alabama
Posts: 5,357
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Originally Posted by James Pierson
Here I go again with this thing,  the Six Shooter. I changed the
transition papers to .0110 thickness and the six fins .0625 thickness.
I also found and Rocksim mistake,  as it had the center tube
coupler(part # Est NB-20) as solid which added .5 oz to this design. I
changed the coupler to .0625 thickness and it helped the mass greatly.
Here are some photo's of my recent launch and please forgive my poor
photo editing techniques. |
This looks good, James. Are you ready to post to the website with it?
Quote:
Here are the stats:
Six Shooter - Simulation results
[B4-2]
Launch guide length: 36.0000 In.
Velocity at launch guide departure: 32.7044 MPH
Minimum velocity for stable flight reached at: 29.7878 In.
Velocity at deployment: 5.5232 MPH
Altitude at deployment: 128.32964 Ft.
Maximum altitude: 129.39960 Ft.
[B6-2]
Launch guide length: 36.0000 In.
Velocity at launch guide departure: 32.2724 MPH
Minimum velocity for stable flight reached at: 31.7649 In.
Velocity at deployment: 4.7298 MPH
Altitude at deployment: 126.30121 Ft.
Maximum altitude: 126.90206 Ft.
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Interesting performance comparison. The B6 gets no better performance than the B4, and fractionally not as good. The slower Dv is perhaps the only plus reason for using it, but otherwise the B4 is the optimum motor.
It's also good to see those changes had such a large effect on the simulation. You've gained confidence with the program, too. That's the real 'plus' here.
Good photos, too. You got three out of six streamers in the frame with the main vehicle post-deployment. Looks like a fun model... |