Dual Sport Trailer assembly thread

Discussion in 'Some Assembly Required' started by The Cheat, Jan 13, 2006.

  1. oPAULo

    oPAULo jack of all terrain

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    Looking pretty cool Nick!!
  2. rw4x4van

    rw4x4van East Coast Rider

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    :lurk
  3. oPAULo

    oPAULo jack of all terrain

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    Ok kids, got my dirt wheels back on and took the trailer out for a good thrashing. Went down by the river to a spot I want to camp. Did a hill climb, deep ditch and log crossing. As you can see, the smaller rear wheel is not an issue. I think the fatter tire you get with a smaller wheel is a benefit as it won't pinch flat quite as easy. I can feel the trailer more with the dirt wheels on the bike but still no big deal. I went everywhere I wanted to go. In the video you can see some bouncing but not as bad as I thought it was. I should have loaded more weight in it. It really stabilizes with more weight. The shocks are just a shade too stiff offroad with a small load in it. It had maybe 15 pounds of stuff in it. I should have thrown a couple cinder blocks in it for the test. It will handle it no problem.

    The video doesn't do the hill justice. It's meaner than it looks.

    <iframe width="420" height="315" src="http://www.youtube.com/embed/-k-DjnjvxPc" frameborder="0" allowfullscreen></iframe>
  4. ben2go

    ben2go Moto Flunky

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    Either the trailer is loaded to light or the shock spring has to much preload.It left the ground on some small bumps and kept bouncing.It shouldn't do that.Minor adjustment.
  5. oPAULo

    oPAULo jack of all terrain

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    It's the stock rearend from a Z50 which is heavier than the trailer even without a rider so yes it's too stiff. Not as bad when it's loaded but could be softer. I'm thinking about giving the shocks more anlge to increase the lever action and soften it up. Maybe even the upgrade oil dampened shocks too.
  6. DakarNick

    DakarNick Swabee

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    I didn't get anything done last night, my apologies :lol3

    I'll continue tonight. That reminds me, I need to check tracking for my shock. But, I still need a 21x3.00 tire so I can get the shock lined up.
  7. thatboatguy

    thatboatguy That Boat Guy

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    Actually I'm pretty happy with that part. I'll try and post some more photos today. I rode around the hood and actually don't like the hitch. I brought the front wheel off the ground at one point and it bent my license plate! I put the box on the frame temporarily and then sat on it. Nothing bent unduly so I jumped on it a little. Then I jumped on it hard landing with my full weight. The shock took up the impact and nothing got bent out of shape. I will redo the hitch to be more like Paul's I think. Right now I got sidetracked by a couple of other items on the honey-do list.

    George
  8. Greg Bender

    Greg Bender Long timer

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    Good deal...it can be hard to really get a good feel for the strength of something just looking at photos :>

    Regards,

    Gregory Bender
  9. DakarNick

    DakarNick Swabee

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  10. DakarNick

    DakarNick Swabee

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    Made some progress tonight. Not quite sure how the geometry will work but I'm designing as I build.

    [​IMG]

    [​IMG]

    [​IMG]
  11. tomatocity

    tomatocity Retired and lovin' it

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  12. DakarNick

    DakarNick Swabee

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    Thanks for the compliment.

    I'm sure there is a formula for shock geometry, how it correlates to weight, swingarm length, swingarm travel, etc. But I don't know it. Trial and error for me :lol3

    The swingarm tubes (two on swingarm, and the trailer body itself) each have graphite-infused bronze bushings installed. I'll take a pic of them tonight.
  13. DakarNick

    DakarNick Swabee

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    All pivots use bronze bushings.

    Here are some swingarm pics.

    [​IMG]

    [​IMG]

    Horizontal pivot

    [​IMG]

    Other pics

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  14. tomatocity

    tomatocity Retired and lovin' it

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    Good job Nick. Binding / Pinching shouldn't happen. I do like your trailer.
  15. thatboatguy

    thatboatguy That Boat Guy

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    I'm pretty much done. Just have to add a tail light and license plate bracket. My glider just fits into the box. :) I do think I'll eventually shorten the trailer and build a more robust hitch (as I previously mentioned).

    [​IMG]

    [​IMG]


    George
  16. DakarNick

    DakarNick Swabee

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    Looks good, George!

    I've made a bit more progress. Here are some pics.

    [​IMG]

    [​IMG]

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    [​IMG]
  17. MrBracket

    MrBracket Been here awhile

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    Great work on the trailers guys! I do have a couple concerns to share, take them with a grain of salt, only my opinions. I did do a fair amount of testing when I designed my trailer however...

    thatboatguy, in my opinion, your container is too high. This puts the weight up high and can cause some severe handling issues. This also eliminates one of the benefits of a trailer, getting the weight down low. Besides the handling issues, if you fall over, you'll have to raise all the weight up high in the air making it very hard to pick up your bike. Again, please only take this as an attempt at constructive criticism.

    DakarNick, is that a bicycle wheel you are using? If not, ignore this concern. I too was attracted to using a bicycle wheel, some have used them with great success. I was attracted by the low weight. However, if you look back in this thread you'll see what happened to one of my first trailers. I broke the axle in the bicycle wheel. Granted I was on a 160 mile dual sport ride and I rode just as hard as I would of without a trailer. At that time I was carrying only some tools and two roto-pax one gallon gas cans. In my opinion, a bicycle wheel is just not up to the task for a dual sport trailer.

    Again, only trying to be helpful and give constructive criticism. I'm in no way trying to dampen creativity, just offering lessons learned.

    I'm very excited to see there are other "weirdos" like myself that like to pull trailers :evil
  18. DakarNick

    DakarNick Swabee

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    Looks like it compared to those beefy 26" Downhill bike tires, doesn't it?

    It is actually a 21 x 1.6 wheel off a CR250 and a 21 x 3.00 Shinko dirtbike tire.
  19. thatboatguy

    thatboatguy That Boat Guy

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    Concern noted and appreciated! Fortunately for me my trailer serves only one purpose for me. It carries my aircraft. Rucksack, harness and wing with risers weighs in at a whopping 30 pounds! I did entertain the idea that I could carry a Jerry Jug between the box and hitch but I have given up on that idea. The way the trailer is now, I was able to make it more compact in length with the wheel under and can do without a fender. [​IMG]Above is an early attempt at hauling the wing and my camping gear at the same time. As you can imagine, the weight is being carried much higher this way. I can now carry my camping gear in saddle bags and a much smaller box on the back rack.

    George
  20. DakarNick

    DakarNick Swabee

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    Good work, George. I'll have to PM you about your wing!