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Old 05-29-2013, 08:35 PM   #631
ben2go
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Sweet.
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Old 05-29-2013, 08:59 PM   #632
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Sweet.
+1!!
Way cool!
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Old 06-09-2013, 10:29 PM   #633
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Mockup

Still working things out, but you don't know how its going to go until you put all the pieces together.

Here's what I got so far from this evening:



Next step is to find that hitch component that only swings side to side, and holds the trailer from tipping over. I plan to attach to the swingarm, possible through the axle or on the swingarm stand bolt holes.

Couple more pictures:





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Old 06-10-2013, 10:39 AM   #634
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Originally Posted by GHO100 View Post
Still working things out, but you don't know how its going to go until you put all the pieces together.

Here's what I got so far from this evening:


Awesome.
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Old 06-10-2013, 11:24 AM   #635
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I don't see how the suspension will work. What am I missing? Otherwise I love the idea of using a hand truck.

John
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Old 06-10-2013, 11:45 AM   #636
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I don't see how the suspension will work. What am I missing? Otherwise I love the idea of using a hand truck.

John
If you look carefully you'll see that the axle supports to the frame are being used as a bend-then-collapse-type suspension.

It should actually work fine so long as the loaded trailer is kept light. It'll be bouncy though. The only "suspension" action will be the flex of the forks and the frame.
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Old 06-10-2013, 11:52 AM   #637
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Originally Posted by GHO100 View Post

Like the idea of using readily available parts. Wondering if the forks will work as a trailing suspension part. The forks were originally designed as leading suspension and you have them as trailing suspension. Wondering if the forks would function better being mounted, more upright, to the plate. Just a thought.
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Old 06-10-2013, 12:21 PM   #638
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Originally Posted by tomatocity View Post
Like the idea of using readily available parts. Wondering if the forks will work as a trailing suspension part. The forks were originally designed as leading suspension and you have them as trailing suspension. Wondering if the forks would function better being mounted, more upright, to the plate. Just a thought.

Thanks for the thoughts. I fought a lot on paper with how to do all this, and originally had a bicycle shock going to that cross bolt, and the other eye of it mounted to the plate. The trouble with that being the overall length, and how to attach the "spine" to the hand truck center rail.

something like this:
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Old 06-10-2013, 03:23 PM   #639
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Originally Posted by k-moe View Post
If you look carefully you'll see that the axle supports to the frame are being used as a bend-then-collapse-type suspension.
Looks quite rigid to me. However, even if the forks were used in the geometry necessary to get them to rebound and compress the trailer would have to be heavy unless it was resprung/revalved for the lighter weight.
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Old 06-10-2013, 04:25 PM   #640
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I use hand trucks at work so much. There's no way I would pull one on my day off riding.
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Old 06-10-2013, 07:26 PM   #641
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Actually..... if you mount the fork to what is now the back of the trailer (the lift plate of the hand truck) and make it trail by about 10 (not going to do the math just now) it should work just fine. It might even work better without any trail. I'm envisioning that the fork clamp is attached along the top (used to be front) edge of the lift plate. There would be some fabrication of bracing though.
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Old 06-10-2013, 08:30 PM   #642
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Four thoughts:

1. A small universal joint from a farm and home store at your hitch will allow all the movement you need, and prevent the trailer from tipping differently than the motorcycle

2. You should try to get the trailer, at least at the wheel end, lower. I pull a single wheel trailer behind my street bike, and load it heavier than you probably will, but it's amazing how much it tries to tip me over at slow speeds. At high speeds it doesn't, but first gear riding is much more work. I'd expect that each inch you lower the trailer, the less that would happen. AND, the more weight the trailer wheel carries, the less weighing down the back of your bike.

3. I'd try real hard to make the forks a suspension part of your trailer, by bolting them more vertically to the flat plate of the hand cart. You'll have to do a little more fab work for that, but it will make a very real difference when you use it.

4 If you can hook the hitch to a "sprung" part of your motorcycle, all the better. Adding the hitch weight to the swing arm will compromise your ride and handling, All suspension engineers try to minimize unsprung weight, and you're going to add more than you think, especially when the trailer bounces.
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Old 06-11-2013, 09:32 AM   #643
GHO100
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Thanks for the feedback.
1. We don't really have farm stores in NYC, so that'll be tricky to find, but I might canabalize a razor scooter to get the joints out of it. Got a picture sample you can show me of what you had in mind?

2. Good idea. Its a bear to manhandle right now, and pushing it around, it wants to flip itself over. Dropping the rear section a significant amount would help a lot, I think.

4. Where to hitch? I guess I was originally aiming for a setup like thirdwheel trailers, through or on the swingarm, which is what motobracket does too.

Another options would be the passenger footpegs.

I still haven't worked out that bit that goes from the bike to the trailer, basically. Bit harder to do without welding, metal shop access, etc.

Thanks again!

I'll post updates as I'm working



Quote:
Originally Posted by boatpuller View Post
Four thoughts:

1. A small universal joint from a farm and home store at your hitch will allow all the movement you need, and prevent the trailer from tipping differently than the motorcycle

2. You should try to get the trailer, at least at the wheel end, lower. I pull a single wheel trailer behind my street bike, and load it heavier than you probably will, but it's amazing how much it tries to tip me over at slow speeds. At high speeds it doesn't, but first gear riding is much more work. I'd expect that each inch you lower the trailer, the less that would happen. AND, the more weight the trailer wheel carries, the less weighing down the back of your bike.

3. I'd try real hard to make the forks a suspension part of your trailer, by bolting them more vertically to the flat plate of the hand cart. You'll have to do a little more fab work for that, but it will make a very real difference when you use it.

4 If you can hook the hitch to a "sprung" part of your motorcycle, all the better. Adding the hitch weight to the swing arm will compromise your ride and handling, All suspension engineers try to minimize unsprung weight, and you're going to add more than you think, especially when the trailer bounces.
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Old 06-11-2013, 09:54 AM   #644
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Originally Posted by GHO100 View Post
Thanks for the feedback.
1. We don't really have farm stores in NYC, so that'll be tricky to find, but I might canabalize a razor scooter to get the joints out of it. Got a picture sample you can show me of what you had in mind?
The mower bone yard at a golf course is a good place to cannibalize u-joints. The big riding mowers that have a gear box blade drive, use u-joints in their drive shafts.


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Old 06-11-2013, 10:37 AM   #645
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Her are a few inexpensive choices. http://www.surpluscenter.com/sort.as...search=u-joint

Shop around and you may find a better price.....maybe.
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