06-30-2005, 12:36 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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Quote:
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Originally Posted by CenturiGuy
I found it odd that this BT-55 kit had a mini-engine mount with a 9" long stuffer tube, and I thought it was an awfully heavy rocket for 13mm engines.
Here are the general numbers for those of us who don't have RockSim:
Motor -- Max. Alt. (feet) -- Deployment (feet) -- Speed (feet per second)
13mm
A3-4T -- 176 -- 143 -- 41
A10-3T -- 170 -- 165 -- 18
18mm
A8-3 -- 153 -- 150 -- 15
B4-4 -- 365 -- 363 -- 11
B6-4 -- 371 -- 370 -- 6
C6-5 -- 794 -- 791 -- 13
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Sorry to hear about the damaged models, Jay. 
Concerning this model...
I thought it was interesting, nonetheless, to see the performance difference between the A3, the A10, and the A8. You still gotta admit, 170' on a tiny 13mm motor, for a BT-55 body tube, is still a lot of performance! The A10 is the 13mm motor for this brute, notice the deployment V, compared to the A3. The A3 is allowing the model to drop quite a bit before blowing the parachute. The A10 is deploying near apogee.
For the 18mm motor range, the B6-4 is the motor of choice, for the same reason. Deployment V of 6 fps. The C6-5 and D12-5 both get about what I would expect for a model with this tube.
Craig McGraw
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