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View Poll Results: What SU BP motor is most needed ?
18mm B14-x/B8-x with at least delays of 0,3,5,7 16 40.00%
18mm C5-x 11 27.50%
24mm D20-x 3 7.50%
29mm E/F50-x 2 5.00%
13mm B4-x 5 12.50%
13mm 1/2A3-0T 2 5.00%
18mm D8-x like the old Cox 13n-sec D8-0/3 1 2.50%
Voters: 40. You may not vote on this poll

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  #41  
Old 01-12-2019, 07:59 PM
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LeeR LeeR is offline
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Quote:
Originally Posted by PaulK
My T-Bird has 1/4" between the top of the 24mm 1st stage motor and the bottom of the 18mm 2nd stage motor, and two vent holes punched in the coupler, which vent as soon as it starts to separate. The coupler inserts 1/2" into the 2nd stage. The booster is a bit longer than the Farside, so the 1st stage motor doesn't hang out.



Iíll likely punch holes in the coupler for venting, and it wouldnít need to have punched holes in the tube, so it would be faithful to the Farside look.

Iíve vented the booster in my Double Mini Max, and it stages perfectly. The booster motor tube is extended, to get the gases well directed into the upper stage A10. (The booster tube is the Mini Max main tube, 5Ē long, so itís a large separation between motors.) Iíve only flown this rocket on A10s, preferring the larger nozzle diameter for staging, and extra kick from the booster.
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  #42  
Old 01-12-2019, 08:11 PM
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When properly vented, it is possible to gap-stage 10"+.
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