- Apr 30, 2021
- Reaction score
- Northern NJ
Keep up that sort of thing and you'll have to change your user name.I finally got sick of that and created new .eng files under the brand "Estes_w_adapter" for the C11, D12, and E12 with the mass and length of the adapters morphed in, imported them to OpenRocket, and was back in business.
The clipped tips of the fins on Big Bertha are good for that.This particular rocket has some peculiar design constraints: it needs to sit stably on its fins on display
Yes, what I have so far are essentially that style of fin, though a bit wider in span and a bit shorter of leg, with the hard angles broken by transition angles.The clipped tips of the fins on Big Bertha are good for that.
Agreed, especially since most of the municipal restrictions I see are "D or under," and frankly the C11 isn't all that inspiring a motor anyway. The design is for a friend who is dipping his toe back in to rocketry but with perhaps less interest in minutia than I, so the loss of the C won't matter much given every Hobby Lobby has the D and E, and nearly every park can fly a 56mm D with good odds of recovery.C11 seems like a small sacrifice if exchangeable nose weights are something you want to avoid.
#6-32 all-thread works and is stronger than needed in a 29mm MD rocket. I have heard bicycle spokes will work nicely as well.I thought I would build a 29mm and 38mm minimum diameter rockets. I started on the 29mm one tonight. The execution is harder than I thought when I was building them in my head. It's like trying to put 10lbs in a 5lb bag. It needs to have an Av Bay. I am going to use a thick walled 24mm motor tube as a coupler. It's a perfect fit in the 29mm heavy walled motor tube I'm using for the body. I would like to find something to hold the Av Bay together besides a 1/4" threaded rod. I'm putting a MW RRC3 with a screw switch and a LiPo battery in it. A 29mm hole saw makes good end caps. I'll plug the hole with epoxy and drill a new hole below the center for the rod. Anybody know of a different way to hold the Av Bay together? I'm all ears or eyes as the case may be.
I have used titanium spokes on 54mm Avionics bays and other situations. They don't take up much space and have a breaking limit of about 280kg. You get them made to length at bike shops that have the thread-rolling facilities. They also make really good long bolts when needed.#6-32 all-thread works and is stronger than needed in a 29mm MD rocket. I have heard bicycle spokes will work nicely as well.
Good call.Didn't buy this...
Read said build thread. Began looking on the web (mostly Thigiverse) for ram's head designs to steal this concept for a battering ram rocket.Continued in Odd rocs
Can i come?Day off from work (gotta burn 'em or lose 'em) so I got the woodstove fired up in the shop early and got the MDRM, 29mm Bigger Daddy and 2.5" Nike-X covered in sandable primer. Should be able to sand (yipee) later. May run to a hobby shop today to find some stuff for a dumb build idea I have and probably buy too much other stuff.
Always test in flight configuration. So, shock cord and nomex covered parachute should be installed before testing.Just tested the main ejection charge for a 2" diameter scratch build. I'm working my way towards dual deploy and after building the AV bay figured this was the next step. Used .3 grams BP, 2 #2-56 shear pins and and ejected the NC about 15ft. This seems about right to me but if anyone has thoughts I'd be happy to hear. I did not have the shock cord and parachute inserted, would this affect the amount of BP?