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  1. sugarshot

    rocket flight pitch and yaw prediction

    Even gyroscopes could be viewed as a guidance component and also wieght is a big issue. We are avoiding guidance components, to fit regs. Mike makes a good point too that 'unstable swinging' is possible - we have yet to analyze our instabilities (center of gravity moves forward substantially)...
  2. sugarshot

    rocket flight pitch and yaw prediction

    my apologies for the title, of course we are talking about 'flight trajectory' for a vertically-bound flight.
  3. sugarshot

    rocket flight pitch and yaw prediction

    Background; Of the Sugar Shot to Space project (see sugarshot.org) which is an amateur project expected to fly to 67 miles altitude, we (the Payload Team and our outside analysts) are attempting to apply some analysis for the sake of predicting the flight path 'on the fly', and analytically...
  4. sugarshot

    Short trip to 100km

    The project is Sugar Shot to Space, not part of Ausroc.. though one of us is in australia.
  5. sugarshot

    Short trip to 100km

    The main body tube is on the order of 22 feet long. We are thinking of seperating the cone at apogee and returning in two pieces. Presently, we're thinking of free fall until the two sections slow to about 600 mph, then deploy a drogue at that time (sub-sonic deployment). What comes to...
  6. sugarshot

    Casing Overheating and Rupture diagnosis

    To be clear EMT was only to make the first two 1/4 scale test motors. The point of the tests was to check heating effects and that the propellant and motor perform as expected. "Epoxy and Fiberglass" is what we will possibly fly. It sounds sketchy to me, but it's not really epoxy, but a...
  7. sugarshot

    Casing Overheating and Rupture diagnosis

    I'd imagine there will be small scale launches, though were still in motor development. I'm a little unclear to me what tendency a rocket would have to favor the up direction, and I doubt genuinely that any off-angle attitude more than "several degrees" would allow us to reach altitude...
  8. sugarshot

    Casing Overheating and Rupture diagnosis

    We've taken it to be the way to get to altitude, and the way to keep the rocket's parts to land within reasonable driving distance. The first burn event involves lumbering skyward to a mere 1000 feet. Wouldn't taking on angles that early invite further problems? After the first burn is...
  9. sugarshot

    Casing Overheating and Rupture diagnosis

    The burn times are fairly short, so the flight termination modes which may involve splitting the casing are few, but we will include (automated) this as it extends range-safety (manual). With how I picture it, 'blowing out' the '2nd stage' (midjoint) nozzle would mean letting the lower...
  10. sugarshot

    Casing Overheating and Rupture diagnosis

    I'm not an ME, but you draw attention to something that is worrisome, gust loads and misalignment. I might be able to get an answer on the single-stage choice to bring back here, which might be as you put it; "If I were a regulatory person..." There will be a destruct system (no work done...
  11. sugarshot

    Casing Overheating and Rupture diagnosis

    I proposed that we drop not the tube, but the 'lower' nozzle letting a re-designed mid-joint 'nozzle' do the job. A release mechanism with a 50,000 pound load seemed tricky, so we put that aside. My understanding is regulatory limitations somewhat prohibit two-stage designs for amateur...
  12. sugarshot

    Casing Overheating and Rupture diagnosis

    Yes, I said it was 'standard electrical'. I assume it was a galvanized steel, seam welded. That was the first two tests. The next test will use 4130 steel. We test using a 1/4 scale version. The point of the tests initially were take temperature and pressure readings and see if it...
  13. sugarshot

    Casing Overheating and Rupture diagnosis

    The nozzle heating (the casing at the nozzle) seems to be quite limited. I will try to resist bringing the lighter issues here though, as clutter. This one seemed technical enough. You're cooling airflow insight sounds like something we could have overlooked, and I'll pass it on to someone...
  14. sugarshot

    Casing Overheating and Rupture diagnosis

    Thanks, I'll follow your morning star project with interest. Yes, Sugar Shot to Space. I'm not a motor development person for ssts, but participate in some of the issues. When I describe the lower chamber problem, it's quite like that. I'd tell you the whole picture off-list. Even though...
  15. sugarshot

    Casing Overheating and Rupture diagnosis

    Some folks I'm working with on a hobby project could use some insights into addressing an experimental motor casing overheating problem. It's a low energy solid fuel core-burning motor; Say you have a long-ish motor casing with the usual bulkhead and nozzle. This casing has a midjoint, which...
  16. sugarshot

    3D best fit tendline

    Why not do the trendline in slices? Smoothing data.. must be a NASA thing?
  17. sugarshot

    Is this common in engineering?

    Once upon a time a pedestrian walkway several floors up between buildings came crashing down. After removing the bodies, they discovered that it had been attached to the buildings with some small number of 1/4 inch bolts. Not only did the boss not check the drawing work, but the construction...
  18. sugarshot

    Self Employment in Electronics ?

    Thank you all for your comments! In my state, I think the majority of PE licensing pertains to buildings and building systems. I have no interest in building system infrastructure. If I did, for example, consult to do some modification to a boiler system, I'd include the price of the PE in...
  19. sugarshot

    Self Employment in Electronics ?

    I hope to get tips about how to learn quickly how to market my skills (services or products) in Electronics. References to online resources would be appreciated too. I've got a bachelors degree in computer systems engineering, which is closer to electrical engineering than computer science...
  20. sugarshot

    Watts Losses from insulated cable

    Hi All, Having overlooked the actual current (skim reader), I re-visit the question; Say there is some nominal length for each wire, let's call it 5 meters. If the voltage drop across 5 meters was 1/2 volt, each wire would be a '250 watt' radiator, loosely speaking. If such a...

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