Need advice on where to mount key-fob sized action camera on L2 Rocket

Discussion in 'Rocketry Electronics and Software' started by jlabrasca, Jun 9, 2018.

  1. Jun 9, 2018 #1

    jlabrasca

    jlabrasca

    jlabrasca

    Well-Known Member

    Joined:
    Oct 31, 2016
    Messages:
    396
    Likes Received:
    13
    Not sure if this exactly the right section of the forum for this question; but it does have to do with on-board video.

    I have a Foxeer Legend 2+ that I want to mount on THIS ROCKET

    Here is a dimensioned drawing of the rocket and camera.

    locatingfoxeercamera_1.jpg

    The camera masses about 60 grams (about 2 oz). On the pad, the rocket will mass 2.2 kg (about 78 oz.).

    I am working on a mount now. It will have a mechanical attachment to the airframe, so some advice on optimal (or potentially disastrous) placement would be helpful.
     
  2. Jun 10, 2018 #2

    timbucktoo

    timbucktoo

    timbucktoo

    Moderator Staff Member TRF Supporter Global Mod

    Joined:
    Jun 13, 2014
    Messages:
    3,953
    Likes Received:
    24
    Location:
    Cocoa Beach
    I would mount it anywhere above the CG.
     
  3. Jun 10, 2018 #3

    jlabrasca

    jlabrasca

    jlabrasca

    Well-Known Member

    Joined:
    Oct 31, 2016
    Messages:
    396
    Likes Received:
    13
    Thanks. Is the worry that it'd move the CG backwards?
     
  4. Jun 10, 2018 #4

    timbucktoo

    timbucktoo

    timbucktoo

    Moderator Staff Member TRF Supporter Global Mod

    Joined:
    Jun 13, 2014
    Messages:
    3,953
    Likes Received:
    24
    Location:
    Cocoa Beach
    Mounting it above the CG will only improve the CG but the based on weight of camera will probably have little or any noticeable effect.
     
  5. Jun 10, 2018 #5

    jlabrasca

    jlabrasca

    jlabrasca

    Well-Known Member

    Joined:
    Oct 31, 2016
    Messages:
    396
    Likes Received:
    13
    Thanks again.

    I was more worried about the aerodynamics. Should I not be?
     
  6. Jun 10, 2018 #6

    timbucktoo

    timbucktoo

    timbucktoo

    Moderator Staff Member TRF Supporter Global Mod

    Joined:
    Jun 13, 2014
    Messages:
    3,953
    Likes Received:
    24
    Location:
    Cocoa Beach
    For that diameter, no. It’ll add a little drag and reduce altitude but that’s about it. I fly with camera on my 3” rockets all the time and they fly straight & true.
    https://youtu.be/tzC6jxLdZRY
     
  7. Jun 10, 2018 #7

    jlabrasca

    jlabrasca

    jlabrasca

    Well-Known Member

    Joined:
    Oct 31, 2016
    Messages:
    396
    Likes Received:
    13
    Thank you. I'll start cutting the past fore the mount.
     
  8. Jun 10, 2018 #8

    BrainlordMesomorph

    BrainlordMesomorph

    BrainlordMesomorph

    Well-Known Member

    Joined:
    Apr 2, 2018
    Messages:
    192
    Likes Received:
    1
    I took the guts of one of those things and put it in a 4" long BT20.

    With couplers on both ends, it goes between the nose cone and main tube on my LPRs.

    weighs less and no odd drag
     
  9. Jun 10, 2018 #9

    BrainlordMesomorph

    BrainlordMesomorph

    BrainlordMesomorph

    Well-Known Member

    Joined:
    Apr 2, 2018
    Messages:
    192
    Likes Received:
    1
    ooops (how do double posts happen?)
     
  10. Jun 10, 2018 #10

    jlabrasca

    jlabrasca

    jlabrasca

    Well-Known Member

    Joined:
    Oct 31, 2016
    Messages:
    396
    Likes Received:
    13
    I've done something similar with cheap "spy cam" cameras. I was able to use a coupon, and got it for about $40 -- but the Foxeer camera is still a little too expensive for me to attempt that kind of surgery. <smile>
     
  11. Jun 11, 2018 #11

    OverTheTop

    OverTheTop

    OverTheTop

    Well-Known Member

    Joined:
    Jul 10, 2007
    Messages:
    1,594
    Likes Received:
    10
    Ages ago I used Velcro to attach a keychain camera to a fin on my Velociraptor. The thing coned a little on the way up as expected...

    I would recommend something more substantial than Velcro, and also consider balancing the aerodynamics, maybe with a dummy shape, on the other side of the airframe. There might be more drag but a straighter flight.
     
  12. Jun 17, 2018 #12

    kurtisb

    kurtisb

    kurtisb

    Forum Supporter TRF Supporter

    Joined:
    Jan 2, 2018
    Messages:
    11
    Likes Received:
    0
    I expect further forward, it may affect stability. Because of this, I mount mine just above the fins. I do this on my 2in and 4in rockets, with excellent results. Mounting consists of lots of masking tape, to both secure the camera, and create an aerodynamic wedge. This is removed and reapplied each flight. I want to minimize drag and prevent the camera from being being sheared off. I use the 808 style keychain cams.
     
  13. Jul 11, 2018 #13

    jlabrasca

    jlabrasca

    jlabrasca

    Well-Known Member

    Joined:
    Oct 31, 2016
    Messages:
    396
    Likes Received:
    13
    Well, this is turning out to be a bigger PITA than I'd anticipated. I am going to try to mill a camera platform from HDPE. It will mount to the airframe with two nylon screws, one of which will also act as a stop at the back of the camera. Two nylon screws at the front -- one on either side of the lens, and a piece of carbon fiber plate on top, to keep the camera moving with the rocket. I am going to cut it tomorrow or the next day, if I can free up a couple of hours.
    cameraplatform.png
     

    Attached Files:

  14. Jul 11, 2018 #14

    CzTeacherMan

    CzTeacherMan

    CzTeacherMan

    Well-Known Member

    Joined:
    Aug 8, 2014
    Messages:
    2,513
    Likes Received:
    9
    I think you're way over-doing it. You can just wrap the thing with black electrical tape. djs (Glen) does it all the time with key-fob cameras and has never had a problem
     
  15. Jul 11, 2018 #15

    OverTheTop

    OverTheTop

    OverTheTop

    Well-Known Member

    Joined:
    Jul 10, 2007
    Messages:
    1,594
    Likes Received:
    10
    Also with the 808 cameras (and other LiPo devices in general) don't leave them in a drawer and not charged for a year or so. Once the battery discharges it is permanently NBG (no bloody good). I am getting three of these ready currently and all the batteries are stuffed :(.
     
  16. Jul 11, 2018 #16

    jlabrasca

    jlabrasca

    jlabrasca

    Well-Known Member

    Joined:
    Oct 31, 2016
    Messages:
    396
    Likes Received:
    13
    Oh yes. Without a doubt.

    However, the Foxeer Legend 2+ is not a key-fob camera. It has the same form-factor, but it is not disposable (at least not to me). I was fortunate to get it at a substantial discount, but it would cost me $70 to replace it.

    Also there is no part of the rocket that is NOT over-done, over-thought, over-engineered, over-built. It seems wrong to jury-rig a camera mount. <smile>
     
    Last edited: Jul 11, 2018
    CzTeacherMan likes this.
  17. Jul 12, 2018 #17

    jadebox

    jadebox

    jadebox

    Roger Smith/JonRocket.com

    Joined:
    Jan 18, 2009
    Messages:
    5,269
    Likes Received:
    3
    Electrical tape works great for attaching a camera to a rocket. Just wrap it around the body tube and camera. It holds well and usually removes cleanly. And, you can buy it in colors matching your rocket.
     
  18. Jul 12, 2018 #17

    jlabrasca

    jlabrasca

    jlabrasca

    Well-Known Member

    Joined:
    Oct 31, 2016
    Messages:
    396
    Likes Received:
    13
    Yes. Thank you. I have considered sensibly low-cost, low-effort, and easily-implemented solutions for attaching the camera. I decided to go a different way.

    Thanks for the reminder. I have a couple of cheap cameras (one made to look like doll-sized 35 mm camera, and one boutonniere/lavaliere-style spy camera) that I'd planned to disassemble and mount inside the airframe of small diameter rockets. I've had these for a while. I will remember to check the batteries.
     

Share This Page