Post your Raven FIPa files here

Discussion in 'Rocketry Electronics and Software' started by cvanc, Oct 8, 2012.

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  1. Nov 16, 2012 #121

    HOBOjr

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    Yes it is as close to 1400 feet as I could set the program. Thanks it was a great flight and everything worked as planned.
    @ blackbrandt, Thanks for the laugh, it is fixed now!
     
    Last edited: Nov 16, 2012
  2. Nov 17, 2012 #122

    Adrian A

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    The Raven checks for a reasonable G reading before it beeps out the normal pre-launch beeps. So if it's beeping correctly on the pad, then everything needed to detect liftoff was working at the time. The Raven will keep recording for a few seconds after power is removed, so if it had a power loss in flight, it still would have recorded a new flight file. Maybe the twist&tape came loose between when you walked away and when the rocket was launched?
     
    Last edited: Nov 18, 2012
  3. Nov 18, 2012 #123

    dickmoran

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    Flew at MDRA Red Glare on Friday 11-16-12 and today 11-17-12. Friday was with a P38 H123 Skidmark. Went to 2080'. Looks like #3 went before Apogee. Today was on a P38 I180 Skidmark. Went to 3855'. #3 went before Apogee again. Any ideas? 1st time this has happened. Did my parms change?

    Dick
    NAR6306 L1
    Trip 14074 L1
    MDRA 254
     
  4. Nov 18, 2012 #124

    CCotner

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    I recognize that other people on the forum have bigger raven problems than this, but it's always bothered me. How come the user can't simply set a variable value like AGL1 or VEL2 (etc) ? One types it in, and hits program, and what actually gets saved is always a little bit different, within %5 or so. What's up with that?
     
  5. Nov 18, 2012 #125

    dickmoran

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  6. Nov 18, 2012 #126

    Adrian A

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    It's just a matter of resolution. There are 10 bits worth of altitude settings available in the firmware for those settings, or 1024 different possibilities. The setting resolution was chosen to be 32 feet so that it would cover over 32,000 feet. (Why only 10 bits? It had to to with fitting the whole Parrot firmware into 8 k and using type-able ASCII characters for programming)
     
  7. Nov 18, 2012 #127

    Adrian A

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    You can right-click in the parameter window in the graphing part of the FIP to copy or save the selected raw data. I need to get this into the user's manual sometime.

    -Adrian
     
  8. Nov 18, 2012 #128

    Adrian A

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    Looks like you're using standard settings. The two channels are detecting apogee in completely different ways, one using the baro sensor and the other by integrating the acceleration. The accel sensor isn't as accurate as the baro sensor for this application. See the last paragraph in post #89 for more information.
     
  9. Nov 18, 2012 #129

    Rocketjunkie

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    Why twice with Ravens, never in literally hundreds of other flights using other altimeters? If a Raven rides in another of my rockets, it will NOT be alone.
     
  10. Nov 19, 2012 #130
    i am just planning to use these stuffs named Power Perch and 3.7V LiPo. so i would just want to ask that will it be suitable for me to use these versions and also what will be the cost which i have to bear for these versions
     
  11. Nov 19, 2012 #131

    JDcluster

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    I flew my Raven 3 twice and on the second flight (which was also flown at RG); I added a 1/2 sec to the accel apogee (first channel) as the first flight seemed a bit early.
    I looked at the flight profile ( FIPa coming tomorrow) and it was closer to actual apogee.

    JD
     
  12. Nov 19, 2012 #132

    patelldp

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    Flew my Raven 2 twice in my Competitor 5 this past weekend.

    The first flight was on a Cesaroni M840 moon burn for my L3.

    Second flight was on an EX white for the Loki 76-8000 case. Look at the file and see if you can tell me what's wrong or what may have happened during the flight.

    View attachment Competitor5_M2800_11_17_12.FIPa
     

    Attached Files:

  13. Nov 19, 2012 #133

    Adrian A

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    Congrats on your L3.

    Looks like it after most of the drogue descent, it got tangled or something that caused some major spinning, and then it recovered fine when the main deployed.
     
    Last edited: Nov 19, 2012
  14. Nov 19, 2012 #134

    patelldp

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    Not quite. Main deployed on time at 700', but did not inflate. Specifically look at the descent at ~7,000'.

    Any other guesses?
     
  15. Nov 19, 2012 #135

    cvanc

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    I think I'm looking at the same knee in the baro data that Adrian is.

    'Something' happened on the way down at about 7,000 feet; and after that it fell faster until the main deployment. Did you strip your drouge? Did the shock cord break, causing the 2 halves to fall seperately? If the latter, obviously the altimeter was in the half that held the main, right?
     
  16. Nov 19, 2012 #136

    patelldp

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    Close enough!

    The booster on this rocket tends to pinwheel all the way down. Interestingly enough, the repetitive spinning wraps up the cord and hits the quick link against the u-bolt. On 2 flights now, the quick link has either partially or entirely opened. On this flight, the booster separated from the upper section (which held the main) and spun in. Thankfully, the only damage was a popped fillet and the rocket will be ready to fly for next season.
     
  17. Nov 19, 2012 #137

    cvanc

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    Hey I got it! Cool (pats self on shoulder).

    Very interesting behavior of your booster, especially if it pinwheels on many flights. I wonder if there is a way to 'detune' that so it doesn't happen? Weight the top end of the tube? Put a drouge as close to the booster end of the harness as practical? There must be some way to make it stop.

    I forgot to congratulate you on your L3 before, so... congrats!
     
  18. Nov 19, 2012 #138

    JDcluster

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    View attachment EuFLT7.FIPa


    Nothing too special. This was it's 7th or 8th flight ( can't recall)
    This time on a 38mm x 6 grain EX load.
    On the previous flight I flew it on a CTI J330 classic and got about the same altitude except it flew less than vertical.
    The pad was knocked over sending it off of vertical about 15 degrees or so.

    JD
     
  19. Nov 21, 2012 #139

    cvanc

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    Really nice. Another classically clean file. Love it when the data is so smooth.
     
  20. Dec 10, 2012 #140

    JordanT

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    I guess I ought to post this here. Take a look at the negative velocity/altitude at the beginning of the flight. Of course, this rocket shredded into a million little teeny pieces sending the nosecone (with the altimeter inside) off in one direction while (what was left of) the streamer and baffle went a different direction. The flight was a 24mm minimum diameter rocket weighing ~50g dry plus an ~80g CTI F240 for a pad mass of 130g.

    DontBlinkF240.jpg

    View attachment 2012-11-22 Dont Blink F240 Shred.FIPa
     
  21. Dec 11, 2012 #141

    CarVac

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    Disappearing Act, my 38mm minium diameter minimum mass rocket built for the Aerotech I1299, flying on the much gentler I49 with a temporary fincan.
    The simulations (with actual launch weight measured right before the RSO check) stated that the rocket would reach 8773 feet, but it actually went around 9100 despite some mild weathercocking; it was a slooooooow, clean liftoff.
    View attachment disappearing_act_prelude_i49.FIPa

    Things to note:
    • Though this is a 250g single axis Raven2, the lateral axis is smoother during ascent.
    • The temperature spikes at apogee because of the deployment charge.
    • The voltages do all sorts of weird things during the flight; the battery voltage spikes at apogee, falls to zero, spikes higher, and slowly declines; the apogee has a voltage drop during the firing of the charge but it spikes upwards and declines; the main voltage increases at apogee but then drops to a clean zero immediately once the charge goes off.
    • What on earth are 'p' and 'v'? They appear to be related to the flight at some points, but not at all at others.

    video video video
     
    Last edited: Dec 11, 2012
  22. Dec 12, 2012 #142

    Larry Curcio

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    Now I'm really confused. Could you tell me what is classically clean about this file?
     
  23. Dec 12, 2012 #143

    cvanc

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    Hehheh my exwife never understood me either :lol:


    I guess what I mean is the data, especially the baro data, is very smooth and almost completely devoid of jaggies. It almost looks like it was a simulated flight.

    Look around at many of the files posted on this thread. A large percentage of them have very jittery baro data, mostly during descent. I've been wondering aloud as to why this occurs... I suspect it is evidence of the rocket spinning, or maybe tumbling? I'm not suggesting this signifies a Raven problem; I think the data is showing what's actually occuring in flight.

    Anyway some data sets are almost completely smooth like this one was.

    (and just to be clear my comment was about the file JDcluster posted in msg 139 of this thread)
     
    Last edited: Dec 12, 2012
  24. Dec 12, 2012 #144

    CarVac

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    Anyone know the answers to my questions?

    1. What is the voltage doing? and
    2. What are p and v?
     
  25. Dec 12, 2012 #145

    cvanc

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    I'll answer the second one first - I have no idea what you're referring to when you say P and V. I don't see anything like that on my laptop. Post a screengrab, maybe, so we can see what you see?

    As for the voltage, something kind of odd is going on. Look at just the raw battery data around apogee. It's normal for the battery voltage to sag when igniters go off. But after the apogee event your battery voltage momentarily *rises* more than 2 volts above the pre-apogee value. Beats me why that happens. I have not seen that before.

    All the other voltage data (the 4 outputs) look pretty normal to me?
     
  26. Dec 12, 2012 #146

    CarVac

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    I don't have my laptop with the FIP on it at the moment, so I can't show a screenshot, but in the box where you can select what variables to graph, at the end of the non-binary variable list there are two variables: p and v. P spikes up and down, and then settles. V consists of periodic spikes with slow downward slides. I'll post a screenshot sometime.

    Regarding the battery, there was a little ejection charge intrusion into the av-bay, so it warmed up, but I'm not sure that would cause the battery voltage to jump so dramatically.
     
  27. Dec 14, 2012 #147

    Adrian A

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    Wow, that's impressive data. The only comparable flight data I've seen is from a 38mm research L.
     
  28. Dec 14, 2012 #148

    Adrian A

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    I think that could explain the readings. When there is conductive gas, it could bypass the resistors that reduce the voltage going into the A/D converter. Hot smoke or something like that could explain the temperature readings, also.
     
  29. Dec 14, 2012 #149

    CarVac

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    Interesting; I didn't think of the gas itself affecting the readings.

    With regards to the mysterious 'p' and 'v' channels: here's a screenshot.

    i49_p_and_v_what.PNG
     
  30. Dec 14, 2012 #150

    cvanc

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    Huh! I don't see those parameters on either of the 2 laptops I have. My FIP version is dated March 1, 2012. What's yours?
     

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