After chillin' with the family all day I snuck home to put a couple hours in on the DoorK. Got 2 of 4 planned braces for the attachment points started. Looks different with the door out of the way...
Awesome frame!Posed the bike next to an 8' ladder
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While I'm waiting for the heim joints to arrive I got a couple of the stickers I've been saving mounted on the wing.
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But no real progress while waiting for parts.
In theory that should work, but… it won’t. You are relying on the struts to off set each other partially loaded, which sitting still might work. But once you start moving the door top out or in while you’re riding the weight from being off center will overcome the struts. I can’t see how leaning the bike will force the side car to lean the same way. If you were to use a upper and lower a-arm like on a car, both would react the same (leaning left, right or straight up). Think of a parallelogram .So does this make sense to you guys?
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From the rear view, bike and door are two vertical lines. visualize the swing arms in a row along the bottom edge of the door and back half of the bike as a horizontal line. Now we have a squared off U shape (from the rear view) that is going to want to fall over, one way or the other. Struts are attached in an X shape, top of one side to the bottom of the other. There needs to be enough give to allow the bike and door to lean together, left or right, but enough strut action to help keep it vertical. I'm thinking the struts will need to be partially extended when attached in the neutral / vertical position to allow the lines to lean one way or the other. I wonder how that will effect the struts?
Yeah it seems like maybe all I need is to be able to lean the bike... Although the last pic looks pretty cool and complicated, rolling the sidecar over and tilting the wheel while staying flat and low. Probably not an option for me.Something about that makes me think there are too many connections and it will bind up or be rigid.
Seams like it should be treated like a flexible sidecar. Try searching around on sidecar flex geometry and see if you can find any details on how they work it all out.
Yes this is exactly what I needed another viewpoint. Thank you @Oldbiscuit I can see where you're coming from and seems right to me, especially the upper and lower arms. A parallelogram is exactly what's needed. There has been one planned for a while, without thinking of it as one and I didn't realize the importance either. I had an idea for an upper arm from the top hinge on the leading edge of the door to the headtube area. My concern with it is the different length. I think the lean would be constant left or right, so the arms need to be horizontally parallel to each other for sure. But what will different lengths of arms do to the geometry? I suppose I'll find out. on the rear half of the frames it will be easy to use an upper and a lower arm of the same length. Once the parallelogram is in place I still think I'll need something like struts in place to help the bike to stay vertical, maybe only from the middle of the door to the lower half of the bike frame to help counter the left turn lean. Now I'm wondering if I need to attach the swing arms from the center lines of each half of the frames? For example an arm attached to the chain stay will drop in relative height from the ground as it leans to the left and raise in relative height on a right turn lean. Maybe the pivot points need to be the same distances from the centerlines to counter each other? Man my head is spinning around trying to visualize it...In theory that should work, but… it won’t. You are relying on the struts to off set each other partially loaded, which sitting still might work. But once you start moving the door top out or in while you’re riding the weight from being off center will overcome the struts. I can’t see how leaning the bike will force the side car to lean the same way. If you were to use a upper and lower a-arm like on a car, both would react the same (leaning left, right or straight up). Think of a parallelogram .