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  1. amiliv

    Stripping force for threads tapped in fiberglass sheet

    Note that this is not a recovery anchor. It only keeps the motor from falling out of the back of the rocket; i.e. think of it in terms of a motor retention. Those are the only force these threads will experience.
  2. amiliv

    Stripping force for threads tapped in fiberglass sheet

    I attempted to find this online... But the pages I found either assumed non-trivial prior knowledge of the topic (too many terms and/or abbreviations I'm not familiar with) or were charts for various metals. So, the question for somebody more fleunt in material sciences than I am, if I were to...
  3. amiliv

    Eggfinder receiver reporting it is receiving data and that it lost data at the same time

    Yes, there was continuous "beep-beep" from the receiver. But I don't think I ever seen counter (last number in the first row on the display) increasing while data is being transmitted to it.
  4. amiliv

    Eggfinder receiver reporting it is receiving data and that it lost data at the same time

    Something odd happened on the last launch. I turned on Eggfinder Mini and LCD receiver. The receiver got the signal from the transmitter, and started happily beeping. All fine and good. I proceed to the pad, put the rocket at the rail... And notice that receiver started counting seconds...
  5. amiliv

    OpenRocket issue

    Hmmm... I just had "error on thrust curve import" with beta5. I'll try to hunt down my downloaded thrust curves and see if I can past it after that...
  6. amiliv

    Estes igniter plug colors

    If anybody spots any errors, or a missing motor, let me know and I'll update the spreadsheet.
  7. amiliv

    Estes igniter plug colors

    Ever mixed those colorful plugs, and scratched your head which fits which motor? Fear no more. I made a spreadsheet listing which motor goes with each plug. Print it out and put in your range box. Online version on Google Sheets (which I'll update if/when needed): Also attached PDF version.
  8. amiliv

    Micro and Mini Rail Buttons

    Very late with this reply. The micro-rail (e.g. 10x10 Makerbeam) is plenty rigid in lengths that would be used for low power, and way more rigid than 1/8" rods it's meant to replace. The off the shelf length of Makerbeam is 900mm (just shy of 3 feet). In that length, it is plenty rigid and not...
  9. amiliv

    Screw switch fail

    Ah. I missed that one. Thanks for the update. It means I could just bypass the physical switch since it's redundant (TRS has wireless switch built in).
  10. amiliv

    Screw switch fail

    Wireless switches are not sufficient anymore. There needs to be either physical switch, or the battery needs to be disconnected until you get the rocket next to the pad (doesn't need to be upright on the pad). That's why I have physical switch on the TRS (which has built-in wireless switch)...
  11. amiliv

    Screw switch fail

    Yup. The switch was on the pyro power, to comply with the new NAR/Tripoli safety regulations.
  12. amiliv

    Screw switch fail

    Yup. I do plan to test it. The altimeter is probably fine. It's Eggtimer TRS, and the firing channels are completely electrically isolated (via optoisolators) from the rest of the altimeter. They don't even share common ground, and they are on a separate battery.
  13. amiliv

    Screw switch fail

    Nope, that ematch went into trash bag two months ago. Though I find it plausible that it may have shorted after firing. Yup, it was LiPo, 300 mAh, 2-cell, 35-70C. So if it shorted, that would have put a lot of current through that switch. I guess, if something had to give way, better a cheap...
  14. amiliv

    Screw switch fail

    Walk all the way down to pads in crazy heat... Just for Eggtimer TRS to report no continuity on ematch when armed. Walk back with the rocket in hand. In comfort of air conditioned room this is what I found under the switch: Little goblins stole some copper. Or whatever else happened on the...
  15. amiliv

    Eggfinder receiver case and GPS

    Totally agree. Might not be visible on the photo, but there's actually decent clearance between terminals and the board. FWIW, the two bare terminals on the outside are for LED, but these two switches are part numbers without LED, so the two LED terminals are not connected to anything on the...
  16. amiliv

    Eggfinder receiver case and GPS

    Just as follow up. Made few changes... Switched to M2.5 inserts/standoffs/screws for mounting the boards. Much better fit. Kept M3 screws for the handle/lid/clip attachments. Engraved the "Eggfinder" down the handle. I ended up using NKK HB switches, non-illuminated option with solid caps...
  17. amiliv

    Eggfinder receiver case and GPS

    Uh. Was scouring Digikey for nicer looking pushbutton switches that would fit... Not much choice there given space constraints. Found these NKK HB series switches that are not exactly beauties and would maybe fit maybe not in the space between boards... At whooping price of about $10 per switch...
  18. amiliv

    Eggfinder receiver case and GPS

    Well... First fruits of my weekend project. A rough draft if you will. The case is still basically Black Aero design. Just a bit taller and using threaded inserts for attachment points instead of through-the-case screws. Added hole for the second switch (backlight) as well as hole for GPS LED...
  19. amiliv

    Eggfinder receiver case and GPS

    FWIW, a tiny suggestion for the next time main board is revised... If standard hex #4 or M3 standoffs are used between boards, they rub against the buzzer on the main board. Moving it few millimeters further away from the mounting hole would be awesome ;-)
  20. amiliv

    Eggfinder receiver case and GPS

    Well... I think I have a weekend project to make a bit bigger case. With few more modifications (threaded inserts, etc), while I'm at it. Last time around, I made custom egg-shaped (if you use a lot of imagination) case. Which is now baking under the Nevada desert sun out there on a random...
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