Post your Raven FIPa files here

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

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  1. Oct 8, 2012 #1

    cvanc

    cvanc

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    Hi to all Raven owners (and potential owners)-

    Does it sound like a good idea to post flight data files for all to see and share? This stuff fascinates me and I think there's a lot of learning to be had.

    Examples of both good flights, where everything went well, and not-so-good flights are welcome. I think both kinds can be learned from and if we start sharing our experiences we'll all learn faster. Could lead to some interesting discussions.

    Sound good?
     
  2. Oct 8, 2012 #2

    Rocketjunkie

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  3. Oct 8, 2012 #3

    Rocketjunkie

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    'Not so good flights' usually don't leave enough for good data :(
     
  4. Oct 8, 2012 #4

    cvanc

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    View attachment L910 early main deploy RavenA.FIPa
    Nice! You can clearly see the two thrust spikes, one after the other. A quick glance tells me you were using a healthy 9 volt battery and you only had 2 of the 4 outputs programmed to fire off a charge (which they did).

    Here's one from me. If you look closely you'll see proof the main came out way before the altimeter fired the 'main' charges. My shear pins didn't hold my 6 pound nose cone on and they let go several thousand feet before they should have. Long walk to get this one back!
     
  5. Oct 10, 2012 #5

    JDcluster

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    It flew on an EX 4 grain L motor.
    3 Red grains and 1 top grain White that was left over from a 7300 Ns M that I mixed up the same time.
    Rocket was found the following day about 1.5 miles away, hanging in a tree about 7 ft. off of the ground,
    It was in someone's back yard.


    If you skim through the raw data, you will see it went a little higher than the stated data.


    JD


    BFFLT2cap.jpg

    View attachment BFFLT2.FIPa
     
    Last edited: Oct 10, 2012
  6. Oct 10, 2012 #6

    atxcple

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  7. Oct 10, 2012 #7

    JDcluster

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    It also looks like you had early apogee as well.
    That could have played part to the early main event.


    JD

     
  8. Oct 10, 2012 #8

    cvanc

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    Wow, serious oomph on that motor, very nice! But take a look at your battery. It went apeshit, fluctuating hundreds... no, thousands... of times between normal (10 volts or so) and as low as 3.5 volts. That ain't normal. I'd guess you were kind of lucky that all your ematch events went off well (did they?).
     
  9. Oct 10, 2012 #9

    cvanc

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    Flights look clean and very nice to me. Something funny with your record of the main event - the data for that one parameter seems stuck in an expanded display mode? Can't get it to read up from zero volts - does it look like that on your PC too? All I can see is 3.82 to 3.86 volts; it won't zoom out. The info seems fine, the display just is wonked a bit.
     
  10. Oct 10, 2012 #10

    cvanc

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    Yes, I did go early at apogee. Discussed in another thread, seems it was a combination of ejection charges leaking into the AV bay and I hadn't calibrated the altimeter. I think these are fixed now... I'll find out for sure at Midwest Power LOL.
     
  11. Oct 10, 2012 #11

    Larry Curcio

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    Either these files are selected for posting because of their bad data, or the accelerometers on the Raven are strictly for entertainment value.
     
  12. Oct 10, 2012 #12

    SSenesy

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  13. Oct 10, 2012 #13

    atxcple

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    another I351 blackjack flight this is the one that was all wonky. winds were very much a factor in this one i think. apogee went off early followed quickly by the mains

    View attachment talon3 I351.FIPa
     
  14. Oct 10, 2012 #14

    atxcple

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    it is the same on my pc too. i figured it was this way becouse i use a perch and 3.9v lipo batteries. therefore no real voltage drop.
     
  15. Oct 10, 2012 #15

    cvanc

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    I'm no expert at this; I posted this thread as an attempt to learn. It looks to me like your battery went all the way to zero volts when the apogee charge went off. That can't be good. I don't know how that would afftect the altimeter - would it reboot in midair? And if it did, what would that behave like?

    In any case, yeah that's an example of something not gone right, but I can't really say what. Really jagged baro data - lots of crosswind in your ports, maybe?
     
  16. Oct 10, 2012 #16

    cvanc

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    I don't think that is a general truth. Here's another file from me. I use the Power Perch and 3.7V LiPo too. It does not show that behavior.

    View attachment L2Cert K735 RavenB.FIPa
     
  17. Oct 10, 2012 #17

    cvanc

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    First off, nice flight and wicked motor. 15G peak and more than 10G for 3 solid seconds - quite a ride.

    But I see something very interesting near the end of the flight. If I'm reading it correct your rocket slowed down (implying the main came out - baro data) at ~153 seconds. But the main ejection charge did not fire until ~160 seconds. Not sure what's up with that?
     
  18. Oct 10, 2012 #18

    tfish

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    Dual electronics? "Other" device fired main off and this device captured the even? I just bought a Raven and have not used it yet.

    Tony

    Tony
     
  19. Oct 10, 2012 #19

    SSenesy

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    That's likely what happened. I had an Adept22 in there as a backup and it probably fired first. If I remember right the Adept was triggered at the 600' and the Raven at 500'. The Adept programming options are limited, so it was easier to make changes to the Raven. You can see both the apogee charges, but they were separated slightly (I think).
     
    Last edited: Oct 10, 2012
  20. Oct 10, 2012 #20

    SSenesy

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    Thanks! It was a pretty wild ride. I was very happy to get it back after landing about a mile away in some very thick woods. Long shock cords are wonderful for helping to pull rockets out of trees.

    Gone to Plaid.jpg
     
  21. Oct 10, 2012 #21

    cvanc

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    NICE picture!
     
  22. Oct 10, 2012 #22

    cvanc

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    Sounds good to me. But as for seeing 'both' apogee charges, I don't follow. Did the Adept fire at apogee too?

    Your Raven only triggered one channel (Apogee) at the top and one channel (Main) at 700 feet - the Adept went at 1,000 feet. The other 2 channels of the Raven (Pyro 3 & Pyro 4) are flatline at zero; I assume this means they were not programmed to do anything? Dunno.

    Your baro data is really smooth, you can hardly see a squiggle when a charge goes off so it's difficult to know. (I'm a bit jealous of that as my charges caused a big whack in the baro trace and set stuff off that wasn't supposed to go yet)
     
  23. Oct 10, 2012 #23

    SSenesy

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    Both the Adept and the Raven were set to blow at apogee. It looks like one went slightly after the other. I should probably delay one for a second or so after apogee, but it hasn't been a problem so far.
     
  24. Oct 10, 2012 #24

    JDcluster

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    Al you need is 3.7 volts or so to fire a e-match. After the charge goes off; you can throw out the voltage data on that channel.
    If you look at just the battery voltage; It's fine. It dropped to 3.8 volts under load then went back up to 10.xx volts.
    I use 9.6 volt Powerex rechargeable NiMH batteries. They work for all my altimeters.


     
  25. Oct 12, 2012 #25

    JDcluster

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    Here's another flight from LDRS
    It is of my 3.12" x 78" rocket I call: Euphoria 2.
    It flew on a CTi J 330.
    EuphoriaFLT6cap.jpg


    The pad wasn't in the greatest shape and it was knocked over as it took off, sending the rocket on a less than nominal flight path.
    It would have gone much higher if the pad was a tad bit stronger.

    View attachment FLT6.FIPa


    JD
     
    Last edited: Oct 12, 2012
  26. Oct 12, 2012 #26

    cvanc

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    That is an almost classically clean file. Very nice. Different power source than the other one?
     
  27. Oct 12, 2012 #27

    JDcluster

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    First time using the power perch.


    JD

     
  28. Oct 12, 2012 #28

    Wingarcher

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  29. Oct 12, 2012 #29

    cvanc

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    That little spike lines up in time with your apogee charge going off. Somehow the baro sensor is 'seeing' your ejection charge... at least a little bit. AV bay may need better sealing? Hard to say as it does not seem to be very much. I'd guess a small amount is not a problem?

    On the Weasel it looks like your main came out at ~2600 feet but the altimeter didn't fire the main charge until 480 feet. Drag separation, maybe?

    The other interesting thing is how utterly smooth the baro data from the Weasel is; really nice. But the Wildchild baro data is rougher, more granular, "busier". Some of the other files posted here have that look too. I wonder what it means? Crosswind in the vent holes? Vent holes too small? Too big? I have no idea.
     
    Last edited: Oct 12, 2012
  30. Oct 12, 2012 #30

    Wingarcher

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    The 10-7 wildchild showed serious twisting up of the apogee shockcord, I wonder if the rough data is from the spinning and tumbling. All of these flights have been drogue-less. The weasel flight... yes, my main shook loose. The nose-cone was not as tight as it should have been. One thing I've noticed with these rockets is that it's hard to get the charges small enough.

    As for the peak in the baro around apogee, the pressure goes down, not up, and I can't sort out a scenario that would make that happen.

    I like the raven (fits in 38mm easy) and you get to look at the data instead of just getting some beeps after a flight.

    Question: is it possible to retrieve the "beeped out" altitude in the FIP? The baro data maximum isn't what it beeps, but I can't remember the beeped altitude.

    Nat
     

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