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Thread: Underseat Battery Installation.

  1. #1
    kiwicubber's Avatar
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    Underseat Battery Installation.

    I have just purchased the Attlee Dodge kit for under seat battery, and the instructions are to route the wires IAW AC 43.
    Just looking for ideas where to mount the battery solenoid?

    cheers Bill
    Bill and Neroli.
    www.supercub.co.nz

  2. #2
    Eddie Foy's Avatar
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    Kinda like this. My Firewall Atlee installation
    Click image for larger version. 

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    "Put out my hand and touched the face of God!"
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  3. #3

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    Mount it and starter solenoid on a plate in front of the box between the seat legs. Someone should have a pic.
    DENNY
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  4. #4
    wireweinie's Avatar
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    Mount the master relay on the front, center, lip of the tray. Route a 4 gauge battery cable down under the floor. Bring it out from the floor between the boot cowl and kick panel on the left side. Clamp it to the fuselage tube that angles up to the top engine mount fitting. What I do here is fabricate a bracket to hold the start relay to the tubes. Then route more 4 gauge cable from the start relay, out the firewall hole that uses the phenolic chafe strip, and on to the starter.

    Web
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  5. #5

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    4 gauge? Thanks- I was just going to look to see if I could find the specs for how many amps a typical skytec/b&c loghteeight starter pulls, as I’m doing this mod now and getting ready to order wire...
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  6. #6
    wireweinie's Avatar
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    If you leave the battery back in the stock position, I'd stay with 2 gauge cable. But under the seat, or farther forward, 4 gauge works well. Shorter cable length allows use of smaller cable.

    And be sure to put spike diodes on all of your relays. Your avionics will thank you for that.

    Web
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  7. #7
    Eddie Foy's Avatar
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    I went with 4 ga on my firewall installation.


    Quote Originally Posted by wireweinie View Post
    If you leave the battery back in the stock position, I'd stay with 2 gauge cable. But under the seat, or farther forward, 4 gauge works well. Shorter cable length allows use of smaller cable.

    And be sure to put spike diodes on all of your relays. Your avionics will thank you for that.

    Web
    "Put out my hand and touched the face of God!"
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  8. #8
    55-PA18A's Avatar
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    Quote Originally Posted by Eddie Foy View Post
    Kinda like this. My Firewall Atlee installation
    Click image for larger version. 

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    I believe the OP is asking about the underseat installation in a SuperCub.

    Jim
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  9. #9
    Eddie Foy's Avatar
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    You are correct.

    Quote Originally Posted by 55-PA18A View Post
    I believe the OP is asking about the underseat installation in a SuperCub.

    Jim
    Last edited by Eddie Foy; 01-26-2019 at 06:12 PM.
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  10. #10

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    This photo ought to give a general idea of what Web was referring to:

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  11. #11

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    Here’s a good way to route cables thru the floor.
    piper bulkhead isolators.
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  12. #12
    wireweinie's Avatar
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    I install the master relay directly on that forward, upturned lip on the tray. The steel is plenty strong and there is plenty of room for the head of the screws. Just cut a narrow piece of P-tex or phenolic chafe strip and drill clearance holes for the screw heads. Another advantage of the single, master relay on that lip, is that it still leaves room for the brake masters.

    Web
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  13. #13

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    It does get a little busy under there, brake resivours must be considered if you are going this route:
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  14. #14
    Steve Pierce's Avatar
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    I just installed Atlee's under seat battery tray in a flying Super Cub. It was a late model airplane so it had both the starter relay and the battery master relay and I mounted them like the pictures posted above. I ran the battery cable down the left front seat tube, under the flap handle and attached to the diagonal tube that goes up and forward from that cluster. Since the electrics are still in the right wing root I ran the power wire through the hole in the floorboard for the brake line and up the tube forward of the door opening to the windshield post. I trimmed the interior panels for clearance of the wires and used spiral wrap, wire ties and Adel clamps to route the wires and eliminate the chance of chafing.
    Steve Pierce

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    The only one I have seen is like that. Seems to work fine, and battery replacement/brake servicing is not difficult. But it is on an amphibian. I would think that the first thing one would do when installing Wips is move some weight aft?
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  16. #16
    Steve's Aircraft (Brian)'s Avatar
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    Underseat Battery Installation.

    I have been installing the solenoids in tandem above the torque tube... starter on the seat frame, master on the battery tray... this makes it a lot easier to service any style brake master cylinder installed...



    Aluminum bracket pop riveted onto the seat frame for starter solenoid...



    Bracket is bolted via adel clamp at the bottom...



    Solenoids installed..



    This one has a set of my master cylinders installed...



    Battery and wiring...



    Top view... note the access to master cylinders is improved by this setup...

    Brian


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    Last edited by Steve's Aircraft (Brian); 01-27-2019 at 02:11 PM.
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  17. #17

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    I've been making them side by side. Click image for larger version. 

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  18. #18
    cubpilot2's Avatar
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    How many folks are leaving the springs in vs the hinged plate that comes with the STC kits?

    Any issues with springs contacting anything of concern?
    Ed
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  19. #19
    wireweinie's Avatar
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    Talked to a couple of customers that have had the springs connect with 'hot stuff'. I highly recommend fabricating a solid aluminum panel to serve as a seat bottom, in place of the original springs, any time you have electrical items under the seat.

    Web
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  20. #20
    www.SkupTech.com mike mcs repair's Avatar
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    Quote Originally Posted by cubpilot2 View Post
    How many folks are leaving the springs in vs the hinged plate that comes with the STC kits?

    Any issues with springs contacting anything of concern?
    do NOT leave springs in... they will short out on battery in flight... Like web said above know of a guy had his short out in flight, scud running using gps, the the seat shorted out melted the battery & seat no electrical system/gps then, seat was one of those sleeping bag ones... almost cost him his plane.... and STINK!!!!! luckily he was on skis and it was winter and he landed quick and got it out...

  21. #21
    hotrod180's Avatar
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    Quote Originally Posted by wireweinie View Post
    …. I highly recommend fabricating a solid aluminum panel to serve as a seat bottom, in place of the original springs ….
    Has anyone used Ceconite for a seat bottom, a la BAS Cessna jumpseats?
    The little bit of give they have is a little more comfortable than an aluminum panel.
    Cessna Skywagon-- accept no substitute!

  22. #22

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    I covered my front seat bottom and the backs of front and rear seats with fabric about 9 years ago. So far, so good.
    They're pretty light.

  23. #23
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    I have heavyweight Stits on mine. Works great. You'll probably want a bit stiffer seat cushion bottom.

  24. #24
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    Quote Originally Posted by hotrod180 View Post
    Has anyone used Ceconite for a seat bottom, a la BAS Cessna jumpseats?
    The little bit of give they have is a little more comfortable than an aluminum panel.
    I did before I moved the battery. It is really a pain in the ass to take the stick out, and take the front seat out to access the battery. With the metal plate you can take the cushion off and flip it up to access the battery


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  25. #25

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    What's a battery?

  26. #26
    kiwicubber's Avatar
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    Do you leave the Springs in Steve?

    cheers Bill
    Bill and Neroli.
    www.supercub.co.nz

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    and remember that the relays are not the same.....

  28. #28
    skywagon8a's Avatar
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    Years ago there was a Cherokee 140 near here which had the back seat option. The springs on that seat squashed down enough to short out the battery and start a fire. This isn't just a Cub hazard.
    Last edited by skywagon8a; 01-30-2019 at 08:31 AM.
    N1PA

  29. #29
    Steve Pierce's Avatar
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    We had a PA14 here that a previous mechanic and cleaned up and painted the battery box on. He forgot to reinstall the wood blocks and as we were towing the airplane to the work hanger the battery contacts contacted the lid and shorted out causing a fire. Got the interior and the instrument panel and glass. Pretty scary.

    I can't imagine servicing the battery under the springs or a fabric seat bottom. I have always installed the hinged seat bottom.
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  30. #30
    Steve Pierce's Avatar
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    The Atlee seat pan is made to fit a Super Cub seat modified with their folding kit. If you install it on a regular seat you will need to do some filing to make the pan fit the seat.
    Attachment 41181

    Attachment 41182
    Steve Pierce

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  31. #31

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    Alum thickness for seat bottom mod?

    Thanks,
    Doug
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  32. #32
    wireweinie's Avatar
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    Quote Originally Posted by Oliver View Post
    Alum thickness for seat bottom mod?

    Thanks,
    Doug
    Depends on the thickness of the bottom for the aluminum.

    Web
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  33. #33
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    Quote Originally Posted by Carey Gray View Post
    What's a battery?
    It's those things in your flashlight that used to have electricity in them.
    Cessna Skywagon-- accept no substitute!
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  34. #34

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    Sorry, my question was what thickness aluminum sheet is reccommend when fabricating the seat bottom to replace springs?
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  35. #35
    wireweinie's Avatar
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    I'd use .050, but I'm sure somebody could roll beads in .040 and make it work. I've also seen composite used. It only has to be thick enough not to bend when you sit on it.

    Web
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  36. #36
    www.SkupTech.com mike mcs repair's Avatar
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    Quote Originally Posted by Oliver View Post
    Sorry, my question was what thickness aluminum sheet is reccommend when fabricating the seat bottom to replace springs?
    I use .050" also... you can drill lightening holes and flange them if you want... I don't bother drilling them.....

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