True , but also mixing up fuel types and sharp stepped edges will shear AP just as easily. I would round over your edges on all your grains.Burnsim doesn't work well on long, thin motors - it does not take into consideration erosion burning down the core. The cores are 1/8th up to 3/8ths, with a large throat on the nozzle. I'll video & post burn here.
Easy Answer - What could possibly go wrong?
Real Answer - Worst case scenario is blowing out either the fore or aft seals, which will either plant it to the ground or make it a very bad rocket.
Besides, I'm a huge fan of lighting tripods
EDIT - Plus there is a whole 1.6 seconds of burntime.
Going to have to agree with this - the 1.6 second burn time raised an eyebrow here. I really doubt you're going to get that slow a burn out of a motor with this extreme long and thin geometry. Assuming your 1600 N average thrust is correct, the longest it could burn and still be a J is 1280 Ns on a full J/1600 N average thrust = 0.8 seconds.impossible. 1600 x 1.6 = 2560Ns which would be a full K/baby L. and that is just simply not happening. how did you come up with those numbers?
BurnSim says 1.6, I mistakenly used that number. It will be less than a second, is my guess, but we'll seeTrue , but also mixing up fuel types and sharp stepped edges will shear AP just as easily. I would round over your edges on all your grains.
Agreed & already done
1.6 second burn J1600? What grain formula(s) from RCS are you using ? What holds the tripod in place ? Your neighbors may not like a J motor flying thru their yard if a leg pops and it turns into a land shark.
Not a silly question at all, it was a big concern of mine - Igniters that come with Aerotech 29mm H & I reloads are long enough with 6 inches to spare. I was prepared to "build around an inserted igniter" but that was not necessary - marked on the wire how far it had to go in, and it went all the way in first try, much to my surprise.Silly question: how do you get an igniter into a 1/8" core that far up a motor?
I'm also looking forward to videos/data from the test.
Perhaps (no, really?) I bit off more than I could chew. I don't think I will try again, as my main purpose was making the largest 29mm I could.Before you bail completely on making motors, can you do something less ambitious (say 1-2 grains of the same approximate size)? My understanding is that it takes the pros a long time to work up to a 30:1 motor like this one.
Been making motors/explosives since before there was a Tripoli. I've learned that I don't know everything, clearly.Payload, how long have you been making motors? The motor you attempted here is a very challenging one to get right, even for experienced research flyers.