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Anyone want to help modify a Radio Flyer Model S?

Discussion in 'Model S' started by David.85D, Dec 17, 2017.

  1. Fusion

    Fusion Member

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    You guys try Plasti Dip spray on the tires? Might be enough to last a few runs and cheap enough.
     
  2. buttershrimp

    buttershrimp Click my signature to Go Mad Max Mode

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    Sounds like you need some miniarachnids , gotta see this thing through
     
  3. mb300sd

    mb300sd Member

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    #63 mb300sd, Apr 15, 2018
    Last edited: Apr 15, 2018
    Autopilots installed and she's driving! Traction is non-existent, especially with no weight in the car. Still waiting on my RTK module for cm-precision GPS, but I can drive around with the remote now.

    Steering servo is plenty strong, I need to grind off the limit pins so I get a bit more steering range.

    Ordered sonar sensors, so should have obstacle avoidance coming soon.

    Next steps, 4G and camera, then I can try an autonomous drive down the park path.

    P_20180415_200339.jpg
    osuv77F[1].png
     
    • Like x 2
  4. jlaeret

    jlaeret New Member

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    Brilliant! :)

    What is the circular thing you've mounted on the hood though? Some kind of antenna?

    Good to hear that the servo works well, I might go down that route as well now that I know it works. Do you have a link to that servo?
     
  5. mb300sd

    mb300sd Member

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    There's a GPS antenna above it, its just an aluminum disc to serve as a ground plane.

    https://smile.amazon.com/gp/product/B0027L7UDA/ref=oh_aui_detailpage_o04_s00?ie=UTF8&psc=1

    I ordered a second one to put in parallel for some extra punch once I get traction figured out.

    I used these linkages and mounts,

    https://smile.amazon.com/gp/product/B01ILCJQLW/ref=oh_aui_detailpage_o04_s01?ie=UTF8&psc=1
    https://smile.amazon.com/gp/product/B0006O5I02/ref=oh_aui_detailpage_o08_s00?ie=UTF8&psc=1
     
  6. Mobius484

    Mobius484 Supporting Member

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    Looking forward to seeing this come together, will need videos!
     
  7. Tozz

    Tozz Active Member

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    I would really like better wheels! I have two of these things, and the noise they make on the street is horrible. My kids don't even hear me when I shout that they need to stop for traffic. There is not a lot I can do, I don't have any experience with this stuff so I'm merely an interested third party :)
     
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  8. mb300sd

    mb300sd Member

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    Pics of steering.. should have taken some while I had it off, but you can get the idea.

    This works decently for traction, but kept coming off. I painted the wheels with flex seal liquid, and then wrapped them before it fully cured, so we'll see how well it stays on now.
    https://smile.amazon.com/gp/product/B00HWROV0E
     

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  9. Hd172

    Hd172 Member

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    Is your project all done? I was thinking about making my daughters remote control because she is too short to reach the pedals right now. I probably shouldn’t have bought it yet but I got it at a super great price. How do you like your steering? I was seeing that people use linear actuators on the power wheel forums. A parts list would be great if you have one.
     
  10. mb300sd

    mb300sd Member

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    Steering works pretty good with the dual servos. I was going to use a linear actuator, but anything under $500 was too slow for the speeds I want it to run. Parts list was posted here, I pretty much stuck to that original plan.
     
  11. Hd172

    Hd172 Member

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    Wait you’re just using the two HS-7954SH‘s? I have a 470oz servo on my rc 4x4. I may just buy another one and take it out of the truck. Thanks again
     
  12. Hd172

    Hd172 Member

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    Also what are you using for servo arms?
     
  13. mb300sd

    mb300sd Member

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  14. Hd172

    Hd172 Member

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    9C5DC5E5-B552-4B6B-BA91-6D159EA39F79.jpeg ED6B7AF9-1762-47BD-B190-9242221D335B.jpeg 7F9794E3-FACE-47B6-8AA4-AD1240EFF5A2.jpeg 9C5DC5E5-B552-4B6B-BA91-6D159EA39F79.jpeg Well I finally got the time to finish my project. I ended up using a castle mamba x esc with a Futaba radio system I already had. I installed a single promodeler 470 servo. I ordered two but found this thing is so strong by itself using 6.0 volts. It can go up to 8.4v but I found I couldn’t overpower the servo by turning the wheel. I’m using a normal rc 2s battery for now until I figure out how much run time I’ll need. The original battery still powers the lights and horns. I did drill two holes to run the wires to the esc and rx in the trunk. I ran and zip tied the motor and servo wires along the existing wires. I also installed bullet connectors so I can go back to the stock setup anytime. It all looks stock when the the seat is on and the trunk is closed. Thanks for the help everyone.
     
  15. Nick_G

    Nick_G New Member

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    image.jpg 465E9190-374C-42CE-9AB2-016C6D4D3030.jpeg I completed converted my RadioFlyer to remote control a few months ago using a large RC servo, I was unable to find a servo saver so I made my own using a couple of springs, the turning circle is not very good but it’s OK if you don’t mind doing 6 point turns. I’ve used a Spektrum DX4C RC control system and a Chinese brushed electronic motor speed controller (ESC). Keeping the RadioFlyer battery powered up is an issue as the BMS requires a coded data signal from the foot pedal but it does stay powered up for about 5 minutes. I’m currently investigating the possibility of upgrading the original brushed D.C. motors to three phase brushless motors but I’ve been unable to remove the helical cut motor pinions from the old motor or source any spare helical gear pinions. Has anyone else on here managed to upgrade the motor/gearbox assembly’s?
     
  16. ricebucket

    ricebucket Member

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    videos please!
     
  17. Nick_G

    Nick_G New Member

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    • Like x 2
  18. Melluh

    Melluh New Member

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    For anyone that is/has been workingbon this, how did you do the throttle control? I would like to keep using the switch that's already in there, if that's possible. Thanks!
     
  19. Melluh

    Melluh New Member

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    Update on my project: I tried breaking open the "gas pedal" and finding some way to control it, but no luck there.
    The problem is that you can't just run the motors directly of the battery, as said before it needs to communicate with the pedal microcontroller to give sufficient current. Right now I'm trying to somehow hack the battery into giving out enough current anyway.

    Summarized:
    - Battery needs signal from gas pedal to give sufficient current for motors
    - Thick green wire out of pedal connects to negative side of motors
    - Thick white wire out of pedal connects to positive side of motors
    - Thin red and white out of pedal are positive and negative of headlights
    - Battery contains 16 cells, I think it's 4S4P
     
  20. kellymc

    kellymc Member

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    Ah...this is probably my same problem, I've been trying to convert mine to RC control as well, but have been experiencing some motor controller issues, I bet it's because the battery is timing out w/o a signal from the gas pedal. I'm really interested in what solution you come up with



     

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