Homebuild leaning sidecar

Discussion in 'Hacks' started by Hellracer.nl, Oct 27, 2012.

  1. Precis

    Precis Maladroit malcontent

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    Free at last, free at last!
    I really miss my Trabbie: faster than a Ferrari, more space than a Porsche and one of the first cars in the world with central locking...

    (at it's top speed of 80 km/h, a Trabant will easily pass any Ferrari doing 70.
    The Trabbie has a decent boot - no need for those ridiculous whale-tail luggage racks fiited to Porsche 911 Turbos.
    From the driver's seat it is possible to lock both left and right side doors....)

    How much lean angle to each side do you get with this hybrid leaner?
    #21
  2. orangebear

    orangebear Long timer

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    it a cool looking sidecar. in the you that would be could a side winder.
    #22
  3. Hellracer.nl

    Hellracer.nl What the hack???

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    Production of version 2 has started.
    The steel box tubing will no longer be used, I'm building a new frame in inch tubing now. I'm planning to use a front wheel from a K100 that I had laying around. The swing arm design is not final yet, I'm not quite happy with it. The shock will also be from a K100. I intent to use as little as possible "strange" or homemade parts to be able to service the sidecar at any BMW dealership. I feel that this could be very convenient when traveling around Europe (as I plan to do).
    Enough talk, time for pics:

    [​IMG]

    [​IMG]

    [​IMG]

    [​IMG]
    #23
  4. FR700

    FR700 Heckler ™©®℗

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  5. NitroMax

    NitroMax Been here awhile

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    Okay Hellracer, I'm now waiting for Halflife's comment overhere :rofl:lol3:D
    #25
  6. TouringDave

    TouringDave Tri Moto Veritas

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    +1
    #26
  7. mismith356

    mismith356 Adventurer

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    Very cool!! Great work...
    #27
  8. halflive

    halflive Been here awhile

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    I will carefully ignore any comments pointing towards my person.
    #28
  9. NitroMax

    NitroMax Been here awhile

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    :lol3:lol3:lol3:lol3
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  10. Ockrocket

    Ockrocket Long timer

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    So, dumb question time...

    With a leaner, doesn't the sidecar chassis change angle as well?

    Both bike and car leaning in towards each other? [I realise the car lean angle won't be as significant as the bike angle]

    And leaning out from each other on the opposite turn.

    What I'm wondering is how do you work out where to put the chassis pivots?

    Should they be under the centre line of the bike?
    Thus reducing the bike's ground clearance [an issue for dirt/offroad riding].

    Or can they be off to the side of the bike? [ie. at footpeg level, with the pivot points being at or outside the width of the footpegs].

    And is a leaner capable offroad or will it be harder to cope with than a rigid [is that the right terminology?] chassis?
    #30
  11. Hellracer.nl

    Hellracer.nl What the hack???

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    The leaner I am building is of the kind where the bike leans and the sidecar stays as it is. A Flexit leaner has a leaning sidecar as well. Mine doesn't.
    The pivot points should be in the center line of the bike, the front pivot point is a little bit higher placed than the rear pivot point. This helps the steering.
    This requires a subframe which will influence your ground clearance. For a road going bike this is not a problem, for off road riding it may be. The leaner sidecar feels like a heavy pannier on 1 side. Not ideal for offroading in my opinion. A fxed rig would be my preference if I would do offroading with it. I'll build a removable strut to be able to create a fixed rig whenever I hit a slippery road.

    I discovered last year on my prototype build that sometimes a fixed rig can be very handy.
    #31
  12. FR700

    FR700 Heckler ™©®℗

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    #32
  13. Ockrocket

    Ockrocket Long timer

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    Thanks Hellracer,

    I like the idea of the strut to give the option of a leaner or rigid chassis.

    Showing part of my farming background from a couple of decades ago, an adjustable top link from a tractor three point linkage would possibly work as the strut for making the sidecar rigid.

    A lighter duty one would be most suitable I'd think, with a quick release set up and a second set of pins along the sidecar chassis somewhere to mount it when the car is being used as a leaner.

    The best of both worlds. :deal
    #33
  14. Ockrocket

    Ockrocket Long timer

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    Well that really makes it easy to remove wheels to fix flat tyres. :rofl
    #34
  15. Hellracer.nl

    Hellracer.nl What the hack???

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    That is exactly as I plan to build the extra strut. I've got a number of M14 top links lying around and plan on using them.
    #35
  16. Mr. Magoo

    Mr. Magoo Long timer

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    Great thread! Hat's off to your talent! .... unexpected use of an HP2.:D
    #36
  17. Hellracer.nl

    Hellracer.nl What the hack???

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    Uhhhm That's not mine.
    I would like to own a HP4 but a HP2 is not my cup of tea. I'm not able to become friends with 2 cylinder bike's to my regret. I've tried many but sold them all within weeks. I'm a 4 cylinder guy. I'm willing to try a 3 cylinder though.
    #37
  18. halflive

    halflive Been here awhile

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    You're missing the best part of motorcycling.
    Four cylinders are good for compact cars. Except when it is a flat four of course. :freaky

    Not much progress here.
    #38
  19. Hellracer.nl

    Hellracer.nl What the hack???

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    4 cylinders in cars? Neh, I like 5 cylinders way better!:D

    Indeed not much progress. Too little time and too much to do.
    I've shortened a K100 front axle to mount the sidecar wheel to. This worked out very well. I'm busy with some reinforcements on the frame and I've milled a number of parts for mounting the hack to the BMW. I was planning on using some used top links I've got but I decided to order new ones with a different thread because I can use the same M20 thread everywhere on the combination. The old top links have M20x1 thread where all the other M20 thread I'm using is M20x1.5.
    #39
  20. Ockrocket

    Ockrocket Long timer

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    5 cylinders is still three less than ideal.

    V8 muscle all the way. :deal
    #40