#41
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The stock 1340/20 design, with a hollow transition section and nosecone, could loft 6 eggs, bulkheads, spacers, padding, and an altimeter (about 450 grams) to around 3000' AGL on an H128W-6; that might make for a challenging high power competition event!
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Bruce S. Levison, NAR #69055 |
#42
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I believe the H128 exceeds the Enerjet fin-can physical thrust limit however.
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When in doubt, WHACK the GAS and DITCH the brake !!! Yes, there is such a thing as NORMAL, if you have to ask what is "NORMAL" , you probably aren't ! Failure may not be an OPTION, but it is ALWAYS a POSSIBILITY. ALL systems are GO for MAYHEM, CHAOS, and HAVOC ! |
#43
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Quote:
There are ways around the Enerjet fin can limitations. |
#44
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Quote:
Yeah. Replace it.
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-Wolfram v. Kiparski NAR 28643 - TRA 15520 MTMA Section #606 President |
#45
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Yes, replace it with a 3d-printed fin can and then coat it with some epoxy.
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#46
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Quote:
That was one of those events where the 1 pound mass limit was the limiting factor and IIRC we did either E or F. Typically Crown/SSRS motors were my choice. Jerry |
#47
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1340/20 dry fit with 3D printed ABS nosecone, transition and fin can.
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Bruce S. Levison, NAR #69055 |
#48
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Looks great!
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#49
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Send a set to Hobby Bench in Phoenix.
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#50
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Quote:
One thing I've done since the early days of building the 1340's is to NOT glue/epoxy the fin unit to the body tube. I wrap a few layers of 1/4'' white art tape around the bottom of the airframe as a 'stop', and 1 layer of tape (or as much as will fit under the back end) just above that to keep the fin can from spinning. This makes it much easier to re-use the can should the rocket come to an untimely end. S.
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SAM #0031 |
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