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  1. #1
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    Project 005 : SumVee HDE - - - Part 1 : installing PERFECT REAR STEERING ( 4WS )

    Project 005 : SumVee HDE (HEAVY DUTY EDITION)










    ---Part 1 : perfect rear steering (4WS)

    I had considered updated project 005 with rear steering via the "summit standard rear steer system" (similiar to what is detailed in the Summit FAQ, THE SAME SYSTEM EVERYONE SEEMS TO BE USING ). But I wanted something sturdier, with stock perfect geometry that would not succumb to bump steer. So I went back to my project Funky Gecko.

    http://traxxas.com/forums/showthread...ht=funky+gecko

    In that build I decided to "simply" cut 2 chassis in half and install a complete front section onto another complete front section (with the front section being longer than the rear, project Funky Gecko ended up becoming a 1/6 scale rig).



    But this time along with a duplicated front steering section I wanted to keep the original summit size and dimensions, along with complete battery boxes.

    Step one was to purchase a 1.5inch x 8 inch steel "backbone" to support the rear (front) section.




    and created a second complete front end out of spare revo parts



    next was to dremel-carve a niche in the chassis to seat and support the backbone firmly




    pre-fitment was rather impressive. later I will drill some holes and pop-rivet the back bone to the chassis for additional sturdiness




    Drilled some holes into the backbone to match the stock bolt pattern (what a pain) and cut a section for the diff lock actuator




    and bent it ever so slightly to match the bend in the stock chassis



    overall fitment looks impressive



    the length is not perfectly spot on, I realized that I needed a few more cm to fit a servo on the end of the chassis. kinda hard to steer without a steering servo. but size wise it is still within acceptable specifications



    the weekend is here and its time to play with the kids, will update with the steering servo placement and support bracket next week.
    MAN, Use Common Sense
    Funky Gecko, SumVee HDE

  2. #2
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    cool ill keep an eye on your progress quite inpressive so far. keep it up.
    NO U CANT DRIVE MY SUMMIT!

  3. #3
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    close up

    MAN, Use Common Sense
    Funky Gecko, SumVee HDE

  4. #4
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    Thumbs up! nice work.

  5. #5
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    Nice build. I'll be following this one!
    Summit TQi w/ Dewalt 14.4v, MERV

  6. #6
    RC Turnbuckle Jr. jamann's Avatar
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    He's at it again looking forward to the completion.


    Sent using lipo power
    Mountains cant stop me
    they have tried

  7. #7
    RC Turnbuckle Jr. Wolfslash16's Avatar
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    Interesting. I'm watching!
    Sl2sh Slayer Summit Sl4sh 1/18 Rally/Teton T-Maxx

  8. #8
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    Funky Gecko has been one of my favorite builds so far! Looking forward to seeing this creation take shape!

  9. #9
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    Yes, keep us posted.


    Sent from my iPhone using autocorrect

  10. #10
    RC Racer
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    Superb idea , It will be somekind of unique rig !! I follow you !
    Don t Go Fast if you are out of Control !!!!

  11. #11
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    Good idea man. I was thinking about doin this the other day but making a custom chassis. This looks much easier haha.

    Sent from my SAMSUNG-SGH-I717 using Tapatalk 2

  12. #12
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    How do you plan to put the servo ?
    Don t Go Fast if you are out of Control !!!!

  13. #13
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    Quote Originally Posted by Banzee View Post
    How do you plan to put the servo ?
    Stay Tuned.

    Back to the Home Depot for more metal



    had to make an aluminum servo "cradle" with my trusty dremel



    servo sits within pretty snug



    more cutting of my summit, had to carve out a place for the servo cradle



    initial placement looks ok - needs some minor adjustments and tweeking
    and possibly a smaller simpler servo horn



    still a work in progress
    Last edited by noir 522; 03-08-2013 at 09:52 PM.
    MAN, Use Common Sense
    Funky Gecko, SumVee HDE

  14. #14
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    nice , look it fit right in place !
    Don t Go Fast if you are out of Control !!!!

  15. #15
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    Lesson learned:

    Aluminum is soft, steel is hard.

    The rear servo is only a mere 208oz of torque but it bent my aluminum servo cradle into a pretzel. So off to the Home Depot for more steel beams. It was murder bending it to the shape that I wanted but after some cutting, drilling and riveting it was nice and solid.








    Due to the longer chassis I had to poor man weld two links together to reach from the servo to the diff switch



    Looking good but still a ways to go
    Last edited by noir 522; 04-23-2013 at 02:01 AM.
    MAN, Use Common Sense
    Funky Gecko, SumVee HDE

  16. #16
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    The servo and servo saver are very close together, it only takes a small amount of distance to fully turn the wheels. Gonna have to set some end point adjustments to keep from burning up my servo. But have no fear, my four channel Spektrum Dx4s radio is here.

    Last edited by noir 522; 04-23-2013 at 02:47 AM.
    MAN, Use Common Sense
    Funky Gecko, SumVee HDE

  17. #17
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    Hah as soon as I saw that aluminum cradle I thought, "hmmm noo WAY!" and sure enough next post hahah! It's amazing how strong these little servos are isn't it! Steel is so much more of a hassle to deal with.. dremel bits don't like it much either. Very original, great job! =)

  18. #18
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    The steel cradle is nice and firm, now on to making the system actually work

    I am making a custom skid plate to cover/protect the rear steering system




    Programming the spektrum DX4S radio (after the most recent software update) is a breeze.


    SCREEN SHOTS

    From a touch of a single button I can switch from normal steering




    4 wheel steering



    crab steering



    rear wheel ONLY steering




    Happier than a fat kid on Halloween night
    Last edited by noir 522; 05-12-2013 at 08:49 PM.
    MAN, Use Common Sense
    Funky Gecko, SumVee HDE

  19. #19
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    Crab steering must be interesting.
    With great brushless comes great responsibility.

  20. #20
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    update

    Im loving the dx4s

    the third channels does all the extra steering stuff

    the fourth channel I have set up as a 3 position switch.
    position 1 unlocked and high gear
    position 2 unlocked and Low gear
    position 3 Locked and Low and ready to go.

    need that ole am radio summit diff lock thingy



    ------------------------------
    low gear as expected is slow, powerful and whiny loud. But combined with the smoothness of the tekin it feels almost like a dedicated crawler (gotta do that tranny slop fix next)

    the truck drives so slow and screams so loud that its actually a relief to go into second gear. I am estimating second gear around 15-16mph, a few steps slower than a stock summit. acceptable.

    The aluminum tekin box gets pretty warm to the touch, the front hitec 7980th servo has external heat sinks and they actually get hot. - gotta check into that.

    I installed a Castle CC Bec Pro and I THINK its doing it's job.

    but now for the bad news.
    __________________________________________________

    I had a 208 oz metal geared China servo in the rear - it burned out within 5 minutes of testing. No worries they only cost $6 a piece, so I stuck another one in. Again it flamed out within 5 minutes???? Now I was kinda worried, maybe the Bec is sending to much power to the servos? The Bec is programmable, but I don't wanna buy the programming box to fix one simple problem.

    So im out of powerful servos!!!! In goes a single traxxas 2075 (125oz torque) . Despite the fact its slower than an armadillo crossing the highway and weaker than a dead armadillo crossing the highway, its holding up.

    Next week I will order another hitec 7980 - debating about a savox 1230. But this Hitec is very steady.

    _________________________________

    problem #1 - I used a plastic tube and metal pins to extend the drive shaft - EPIC FAIL - munchy-crunchy all over the place. So I used a Traxxas axle tube to connect the axle and the internal ribs should hold up as good as stock. I drilled a hole and inserted a metal pin to keep the extendable axle from sliding loose.
    Last edited by noir 522; 07-08-2013 at 08:56 PM.
    MAN, Use Common Sense
    Funky Gecko, SumVee HDE

  21. #21
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    Quote Originally Posted by revoman78 View Post
    Crab steering must be interesting.
    unless you are parallel parking, that crab steer is useless, mostly for show.
    MAN, Use Common Sense
    Funky Gecko, SumVee HDE

  22. #22
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    The 4ws steering system is going as well as expected (using a 125oz torque traxxas servo) - still waiting for something stronger. savox or hitec. still loving that Spekky DX4S radio

    now for the other updates
    MAN, Use Common Sense
    Funky Gecko, SumVee HDE

  23. #23
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    - - - - - - - - THE NAME OF THE GAME IS POWER

    Got home from class the other day and the pieces had arrived at my door step. POWER AND TORQUE IS THE GOAL. Top speed will probably come in about 25mph - not important, I want the power to pull up tree stumps, TREE STUMPS!!!!!. Will probably have to cut and drill every inch of my summit to get it in , BUT I WILL GET IT IN.




    The TRANSFERER : 8 tooth pinion



    The RECEIVER : 72 tooth t-max spur gear



    The PROVIDER : SMC 9000mah 7.4v 28c lipo batteries



    The PRODUCER : 1700kv (torquey) Tekin T8 truggy motor



    The CREATOR : Tekin RX8 22.2v sensored speed controller



    and finally . . . . .

    The PROTECTOR : Custom RX8 aluminum waterproof heat dissipating box




    Muhahahahaahahaah

    With great power comes a lot of fun!!!!!

    Muhahahahaahahaah[/QUOTE]
    MAN, Use Common Sense
    Funky Gecko, SumVee HDE

  24. #24
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    snatched the rx8 apart to add the water proof box and also added Castle bullet connecters to easily attach different motors














    before and after pictures





    installed


    MAN, Use Common Sense
    Funky Gecko, SumVee HDE

  25. #25
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    Due to the extended chassis and rear steering system I required a long and customized skid plate system

    N-BONE initial card board mock up and measurements



    A-Arm skids



    fitment



    front servo protection



    rear servo protection





    added some plexiglass, a heat gun, rite dye, drill and screws and I'm in business
    MAN, Use Common Sense
    Funky Gecko, SumVee HDE

  26. #26
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    heat gun treatment, brace the glass between to flat surfaces, heat the gun to 720 degrees, wave it back and forth over the area to be bent, then slowly bend it just beyond the angle you want, as it cools its usually dead on.







    I cut a gap for the front servo housings . . . . .




    but left the rear as one solid piece, I debated on making one long smooth surface from the back steering to the rear steering . . . . still debating it.





    four holes and four screws and viola






    If it holds up to bashing I hill take it of, clean it up some and dye it black
    MAN, Use Common Sense
    Funky Gecko, SumVee HDE

  27. #27
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    And of course the diffs were upgraded
    with all this torque its time to upgrade the differentials enter GPM hardened steel gears



    Add some shims and some Truck master aluminum diff cups. I filled the diff cups with thick marine grease ( thanks Jamman). It makes the diff lock actuator a little stiffer to move but it should really help with traction



    Now those are some sexy differentials



    The aluminum diff cups, hard steel gears, and the shims should make for a formidable drive train ( 20 years 120k mile gear train warranty).
    MAN, Use Common Sense
    Funky Gecko, SumVee HDE

  28. #28
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    working on the body
    The original hmmwv body proved to be too small (original emaxx size) so I had to upgrade? to a Hummer H2 body

    goal :



    so far:




    MAN, Use Common Sense
    Funky Gecko, SumVee HDE

  29. #29
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    Found a pro line discontinued Hummer H2 XL body. ( one of the few bodies that fit), added some fenders, customized the roll cage, and finished it with a low profile roof rack. Didn't want to put holes in the front for the body posts so I used industrial strength Velcro to mount the front of the body.








    G
    Last edited by noir 522; 08-08-2013 at 03:30 AM.
    MAN, Use Common Sense
    Funky Gecko, SumVee HDE

  30. #30
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    Pretty close to matching the original goal




    MAN, Use Common Sense
    Funky Gecko, SumVee HDE

  31. #31
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    Still needs a stronger rear servo
    MAN, Use Common Sense
    Funky Gecko, SumVee HDE

  32. #32
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    That truck is a beast. You are highly skilled, and I look forward to seeing how this turns out.

  33. #33
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    Great job all the way around. Agree on matching the holes in the front is real bummer and takes some patients to do. Yours looks like it will hold up longer than mine did. Body came out looking great, you really lucked out finding that old Hummer body those things are hard to come by.

    Question; how are you bending the ExoCage parts to make your parts.?
    Endeavoring to persevere !

  34. #34
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    Thanks, I actually bent the exo cage before I purchased my heat gun. I just took a lighter and put a flame to the area untill it softened up then bent it. Drilled a small hole through the top bar to secure it with a small screw. I covered the entire cage with rhino liner to give it a nice smooth like new look.




    fitting the velcro. The all plastic velcro from Walgreens actually works better than the real "Velcro" brand.




    I have always been a big hummer fanatic. Proline actually sold 4 versions of this hummer (stampede size, emaxx size, revo size, avalanche xl size) . On ebay they all looked the same size. So there was a lot of trial and error. Ended up buying a color for every mood.



    MAN, Use Common Sense
    Funky Gecko, SumVee HDE

  35. #35
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    MAN, Use Common Sense
    Funky Gecko, SumVee HDE

  36. #36
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    Nice body!
    Wheels look way better blacked out.
    Nice work all around. To be expected I suppose.
    Thanks for sharing.
    Working hard to appear reasonably sane.

  37. #37
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    Absolutely love it! Great work! As an actual hummer owner I have to buy one of these XL bodies, wish me luck!

  38. #38
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    It finally came.

    Hitec M7990TH Monster torque servo - for the rear



    to pair with the Hitec M7980TH Monster torque servo in the front.

    We are talking 611oz torque x 2

    1,222 oz of Tire Twisting Torque

    I should have named this mugga " The Power Wagon"


    Installation time. perfect job for the upcoming weekend. Also gotta re-program my Castle bec to take advantage of this extra power.
    MAN, Use Common Sense
    Funky Gecko, SumVee HDE

  39. #39
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    Do you have two becs for each of the steering servos?

  40. #40
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    No, just one bec, Castle Creation Bec Pro . On 4s lipo It should be able to handle both servos. Oh by they way thanks to Edstoys & Zepher for pointing out that stock BEC power is 0nly 5.1volts. Once I kicked it up to 6 volts no more lights flickering and no more burned out servos.

    My next issue is that the 7990th dont fit. Its advertised as 2mm larger than a standard stock 1/8 servo. In most applications (like the front) that 2mm does not matter. But the custom made cradle for my rear steering is made to squeeze into a tight spot and perfect servo placement. Meaning that with 2 additional mm I am forced to make a whole new cradle. Steel is such a pain to bend and drill bits dont like it either.
    MAN, Use Common Sense
    Funky Gecko, SumVee HDE

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