Raven 4 battery choice

Discussion in 'Rocketry Electronics and Software' started by Cameron Anderson, Aug 25, 2019.

Help Support The Rocketry Forum by donating:

  1. Aug 25, 2019 #1

    Cameron Anderson

    Cameron Anderson

    Cameron Anderson

    Well-Known Member

    Joined:
    Sep 14, 2018
    Messages:
    335
    Likes Received:
    89
    Gender:
    Male
    Location:
    Reno, NV
    First flight with a Raven 4 and space is at a premium...manual says 3.7 lipo is okay, but I generally prefer more voltage. 7.4v lipo won't fit and 9v is impossible unless the rocket wears it as a hat.

    Any good or bad 3.7 Lipo Raven 4 experiences? I'm building my electronics sled right now and I'm pulling my hair out.
     
  2. Aug 25, 2019 #2

    timbucktoo

    timbucktoo

    timbucktoo

    Well-Known Member Staff Member Global Mod

    Joined:
    Jun 13, 2014
    Messages:
    5,768
    Likes Received:
    472
    Gender:
    Male
    Location:
    Cocoa Beach
  3. Aug 25, 2019 #3

    Cameron Anderson

    Cameron Anderson

    Cameron Anderson

    Well-Known Member

    Joined:
    Sep 14, 2018
    Messages:
    335
    Likes Received:
    89
    Gender:
    Male
    Location:
    Reno, NV
    I like that battery.

    Im guessing you'd recommend the perch? I didn't dislike it when I saw it, but if it's worth the utility, I might have to get it for future use.

    Im flying a Wildman Mach 2 and trying to fit a Raven 4, T3 GPS, RRC 2, 2 switches, one 9v, and two 3.7 lipid in an av bay just over 5" long. It's an exercise in organization to be sure.
     
  4. Aug 25, 2019 #4

    timbucktoo

    timbucktoo

    timbucktoo

    Well-Known Member Staff Member Global Mod

    Joined:
    Jun 13, 2014
    Messages:
    5,768
    Likes Received:
    472
    Gender:
    Male
    Location:
    Cocoa Beach
  5. Aug 25, 2019 #5

    Cameron Anderson

    Cameron Anderson

    Cameron Anderson

    Well-Known Member

    Joined:
    Sep 14, 2018
    Messages:
    335
    Likes Received:
    89
    Gender:
    Male
    Location:
    Reno, NV
    Also pretty cool. I have a simple wiring harness for this airframe to really reduce size. But I will probably fab up a small connector set in the future for larger rockets.
     
    timbucktoo likes this.
  6. Aug 25, 2019 #6

    Buckeye

    Buckeye

    Buckeye

    Well-Known Member

    Joined:
    Sep 6, 2009
    Messages:
    2,112
    Likes Received:
    124
    The 3.7V LiPo mentioned by timbucktoo powers the Raven 3 and PowerPerch just fine, so I imagine it will perform just as well on the Raven 4.

    Ditch the RRC2 and its 9V battery. You have 4 output channels on the Raven, if you are worried about backup deployment.

    Post some pics of your ebay setup when you are done. I have a Mach 2 on the build pile and looking for ebay ideas.
     
  7. Aug 26, 2019 #7

    Cameron Anderson

    Cameron Anderson

    Cameron Anderson

    Well-Known Member

    Joined:
    Sep 14, 2018
    Messages:
    335
    Likes Received:
    89
    Gender:
    Male
    Location:
    Reno, NV
    I like having 2 seperate altimeters for redundancy, hence the RRC2. I need a stratologger for this though.

    One 3.7 lipo is taped in top of the 9v, the other is shoved to the side of the Raven 4...still working in brackets for them. No brass tubes glued yet either for the allthread that will hold everything together. Braas will go on T3 side. And I need to wire up my Raven wiring harness and switches still. They will be pull-to-arm spring lever switches.
     

    Attached Files:

    Buckeye and timbucktoo like this.
  8. Aug 26, 2019 #8

    Earache

    Earache

    Earache

    Active Member

    Joined:
    Sep 20, 2014
    Messages:
    30
    Likes Received:
    6
  9. Aug 26, 2019 #9

    OverTheTop

    OverTheTop

    OverTheTop

    Forum Supporter TRF Supporter

    Joined:
    Jul 10, 2007
    Messages:
    2,823
    Likes Received:
    495
    Gender:
    Male
    Location:
    Melbourne Australia
    Last edited: Aug 26, 2019
  10. Aug 26, 2019 #10

    manixFan

    manixFan

    manixFan

    Well-Known Member

    Joined:
    Feb 15, 2009
    Messages:
    1,137
    Likes Received:
    198
    I don't understand what you mean by this. There aren't any holes on the PowerPerch unique to either the Raven 3 or 4. The altimeter connects to a header on the PP, and the terminal block on the 3 and 4 is identical. The mounting holes for the Raven 3 and 4 are different though. But the PP is compatible with either model of the Raven.

    I have flown many flights with the small Lipo batteries used with the PP (and in his small diameter AV bays) without issue. I did some testing early on and after leaving the Raven on for an hour I was able to fire all 4 e-matches without issue. As with many of these altimeters, you have to make sure your battery won't source more current than the outputs can handle. Hence the smaller capacity cells for the Lipo batteries. I also use Strataloggers and they have the same issue.


    Tony
     
    timbucktoo and Adrian A like this.
  11. Aug 26, 2019 #11

    Cameron Anderson

    Cameron Anderson

    Cameron Anderson

    Well-Known Member

    Joined:
    Sep 14, 2018
    Messages:
    335
    Likes Received:
    89
    Gender:
    Male
    Location:
    Reno, NV
    That's good to know Tony. I was wary about a long wait before flight and having sufficient juice to pop the e-matches.
     
  12. Aug 26, 2019 #12

    Adrian A

    Adrian A

    Adrian A

    Sponsor TRF Sponsor TRF Lifetime Supporter

    Joined:
    Jan 22, 2009
    Messages:
    2,228
    Likes Received:
    152
    Thanks. Tony. I couldn’t have said it better myself.
     

Share This Page