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  1. #1
    Join Date
    14th March 2009
    Location
    Ohio
    Posts
    3,182

    Screwy Jolly Logic Altimeter 2 data

    So I flew my Altimeter2 three weeks ago and then a few days ago. No other flights for Alt2 in between. Same rocket used for both flights. I secured the Alt2 inside the av bay with zip ties to a cradle for the Alt2 in the same location for both flights. Alt2 was fully charged before the November 11th flight. Now reading 89% power. I cleared the Alt2 memory between flights. The data for November 11th looks good and is darn close to the Stratologger data. The data for December is bizarre. I am tempted to treat it as a one time glitch. It will be another week and half before I can fly it again. Anybody else have a similar problem?

    11/11/17
    Loc Iris
    H242 dual deploy
    Stratologger
    Apogee: 1,277
    Top Speed: 217 mph
    Flight Duration: approximately 48 seconds

    Jolly Logic Altimeter2
    Apogee: 1,279
    Top Speed: 209 mph
    Burn Time: 1.13 seconds
    Peak Accel: 10.7 G
    Avg. Accel: 8.5 G
    Coast to Apogee: 7.9 seconds
    Apogee to Eject: -0.3 seconds
    Ejection Altitude: 1,277 feet
    Descent Speed: 22 mph
    Flight Duration: 46.3 seconds


    12/2/17
    Loc Iris
    I284 dual deploy
    Stratologger
    Apogee: 1,277
    Top Speed: 408 mph
    Flight Duration: approximately 106 seconds

    Jolly Logic Altimeter2
    Apogee: 4 feet
    Top Speed: 58,404 mph (Mach 84?)
    Burn Time: 0.42 seconds
    Peak Accel: 0.1 G
    Avg. Accel: 6,279 G
    Coast to Apogee: 6.4 seconds
    Apogee to Eject: -6.3 seconds
    Ejection Altitude: 1 foot
    Descent Speed: 0 mph
    Flight Duration: 6.8 seconds

    Zeus-cat
    NAR# 92125 L1
    Total Impulse for 2017: 1,493.8 N/s Flights: 56
    2017: 1/2A:0, A:6, B:11, C:2, D:12, E:4, F:1, G: I have NEVER launched a G motor, H:1, I:1

  2. #2
    Join Date
    21st December 2013
    Location
    Australia
    Posts
    454
    Looks like same bug as here http://www.rocketryforum.com/showthr...ht=Jolly+logic

    best to report it to Jolly Logic so they are aware it has reoccurred.

    QRS: 124
    AMRS: 32 L2
    Highest Altitude: 10,849 feet
    Largest Motor: CTI 1115J530 IM
    Current Projects:
    Purple Parrot, X Wing


  3. #3
    Join Date
    5th June 2010
    Location
    Danville, CA
    Posts
    717
    It's a false launch. It uses its accelerometer to sense launch (pressure can lag tremendously, acceleration is instantaneous). One accidental shake became the boost, another became ejection, it was always at ground level (that's the 1 and 4 feet marks). All of the data is just nonsense at that point. It missed the actual launch after that.

    The logic tries to ignore handling, but there are limits. Just the right amplitude/duration/pattern of knocks or bumps can do it. In order to capture the launch properly and work for all rockets, it has to be a little sensitive.

    Hope that all makes sense. The solution is to check for "Ready" on the pad if you can and be delicate closing it up. You can arm it at your table, but then you just have to handle it gingerly. No dropping it down the rail or anything.

  4. #4
    Join Date
    14th March 2009
    Location
    Ohio
    Posts
    3,182
    John already posted here, so I will jump in and say John replied directly to me via email after I sent him the data. He replied in less than an hour. Great job John and thanks for the explanation. I'll be more careful handling the rocket in the future. As I explained to John the Alt2 was in the av bay, so it was on for 30-45 minutes prior to launch as I finished prep, built the motor, had the rocket safety checked and then carried it out to the pad.

    Great product and great support from Mr. Beans!
    Zeus-cat
    NAR# 92125 L1
    Total Impulse for 2017: 1,493.8 N/s Flights: 56
    2017: 1/2A:0, A:6, B:11, C:2, D:12, E:4, F:1, G: I have NEVER launched a G motor, H:1, I:1

  5. #5
    Join Date
    9th October 2013
    Location
    San Jose, CA
    Posts
    622
    I never sealed my AltimeterTwo in a bay, it was always attached to the nose tether, or somewhere I could easily open at the pad, set to Launch and then close up with minimal disturbance to the rocket. If you have to seal it in something back at your table, I'd strongly recommend the AltimeterThree, which you can power-up earlier, and then not actually set to Record (done remotely via bluetooth) until you're loaded on the pad and ready to fly (just don't forget to arm it!)

    Will Ferry (Launches & Videos) NAR #96512 (L2) / TRA #15328 (L2) / LUNAR #2759
    L1: 9/2013 @ XPRS, GLR T-Bolt "Thunderbolt" (R.I.P.), H148R
    L2: 4/2016 @ TCC Helm, Binder Design Excel w/DD "dd2.xls", J315R
    Impulse flown (flights): 2013: 767Ns (2), 2014: 4298Ns (8), 2015: 7486Ns (16), 2016: 11693Ns (18), 2017: 11138Ns (16)

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