liveforphysics wrote:The worst possible thing you can do for a trailer is to make it long and put the weight over the back/rear axle area. This make a device that requires almost no influences to start swinging, and something that will be very difficult to stop swinging.
llile wrote:When I built the first one-wheel trailer, I loaded it up with camping gear for a shakedown cruise, and it scared the bejeebers out of me going down a big hill. Wobbling back and forth out of control. I reinforced some key parts of it with some triangulation and some more rigid steel and the wobbling stopped. Grab the trailer in your hands and try to bend it at various weak points. Can you make it deflect, even a tiny amount? Say by twisting the parts that connect to the bike frame? That deflection can add up and feedback into a major fishtail under heavy loads.
Kingfish wrote:Thatâ€™s about it for now; Iâ€™m stoked!
Last word: It did cross my mind during this assembly to insert a 3-Way switch on the Throttle back to each controller as: A, B, and A + B. This way I could figure out which motor might be most useful for different types of conditions or for economy. But â€“ I think I like the 2WD as is; what a monster experience! At this point I presume that I no longer have an electric bicycle, and not really a moped either â€“ but a light electric motorcycle! I hope the frame can last.
Purring like a just-fed happy kitten sleepin' in front of the fire, KF <purr purr>
REdiculous wrote:If it was me I'd take the trailer (unpowered) anyway. Even if it'll only hold 50lbs, it's that much less weight and bulk on the bike....easier on the tires at least.
Num Where Type Amount Total F/R Tot Comments
0 Front Batts, 18 22.86 16.6 22.9 Already on the eBike since January 1st, though included in the total weight.
1 Rear 2 gallons 16.6 33.2 16.6 Hardly worth noting
2 Front Batts, 12 15.24 48.44 38.1 Know it's there, minor lugging uphill
3 Rear 2 gallons 16.6 65.04 33.2 Just beginning to feel squirrely, though manageable
4 Front 3 lbs x 3 9.00 74.04 47.1 Struggles to start on steep incline - but climbs well enough. Bounce in frame noticeable but does not "wobble". Definitely harder to manage. Not sure I would feel comfortable putting any more weight on.
Goal 99.06 25.02 Conclusion: Means that 18 to 24 batts must go to trailer.
Num Where Type Amount Total F/R Tot
0 Front Batts, 18 22.86 22.9 22.9
1 Rear 2 gallons 16.6 39.5 16.6
2 Front Batts, 12 15.24 54.7 38.1
3 Rear 2 gallons 16.6 71.3 33.2
4 Front 3 lbs x 3 9.00 80.3 47.1
Goal 99.06 18.8
dbaker wrote:Try to be more positive, SamTexas Most of us are still pulling for KF to get on the road. We want ES positive energy to help get him there
Location Batts Wyes Status Notes
Front Triangle-L 9 3 Done
Front Triangle-R 9 3 Done
Front Saddle-L 6 2 covered Trailer is strung for 36 batteries/side;
Front Saddle-R 6 2 covered That's 3x4 wyes x 2 = 24 wyes.
Rear-L 12 4 covered Trunk bag is strung for 2x3 wyes.
Rear-R 12 4 covered Conclusion: Prune the branches to make new harnesses.
Trailer-L 12 4 covered We have enough APPs to do this, though 2 short on 45A lugs.
Trailer-R 12 4 covered Note to Self: Self - stop at Vetco to see if they have 45A lugs.
You've finally persuaded me not to make a trailer out of my 1993 Giant 770 AX 16" Chromoly frame. I wouldn't have the skill, patience, or funding to do all you've done.
I do have an idea, though: I could give you this frame and you could weld it mounted parallel to the ground as a stabilizer platform for the bottom of your trailer. It's yours for free if you pay shipping.
You might even use one or both of the dropouts to reinforce the pivot for your front-leaning trailer arm.
Where Type Amount Total F/R Tot Comments
Trailer Batteries 12 15.24
Trailer Gallons 2 16.6
Trailer Clothes 2 4 35.84 Trailer Total
L/R Rear Batteries 24 30.48
L/R Rear Weights 2 6 36.48 Rear; Simulate charger and food
L/R Front Batteries 18 22.86 Already loaded in Triangle
L/R Front Batteries 12 15.24 38.1 Front
Bike only 74.58
jonathanm wrote:You need to try and figure out if ALL the wobble is coming from the flex in the frame, or if there are other factors involved. Is there any slop anywhere in the hitch? If it IS purely due to flex in the frame, then the only solution is to increase stiffness with some more material....welded triangle ideally, but even bolting some thing with a lot of torsional stiffness might help as a "get you going" temp solution. You don't have any 80/20 aluminum extrusion lying around do you?
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