Recumbent tadpole trike: Posts on velomobilforum p.7

Recumbent tadpole trike: Posts on velomobilforum p.7

Hello!
I have been doing some fast prototyping in plywood. I glued up a strip of 3/4" plywood and 1/4" plywood (they are actually metric ply close to those measurements) to get a small sheet of 1" thick plywood. So I then cut this to made some 1" square plywood dowels about 8 foot long. From these dowels , some wood screws, and a couple of bolts I put together a proof of concept tilting trike frame. I want to play with it a bit and will buy more hardware to hopefully put on some wheels. Nothing I built is usable for riding. This is literally just a full scale model and a poor one at that. Mostly I want to see the full size geometry and how the machine functions. So here are my pictures from shortly after the sun was up so forgive the shadows.

Now tilting

Right

Now Tilting

Left

Now a couple of close ups of the middle.

I will post more as I build some more of the model. I am using a "standard" n55 geometry though I doubt that will be what I build to ride but so far it is looking good. I wonder about bearings and how to stop wear on the inside surface of the moving members. I was thinking a solid core with a bearing cup bored into it for support of the bearing might work as a way of eliminating the wear. Several schemes come to mind for making this type of thing work. I think that the bearings might be to big on the outside diameter for 1" square tube so this might not work. If anyone has an idea please post.

Till later,
Ceeann

Comments

Recumbent tadpole trike: Posts on Velomobileforum p.10

I have recently built about 4 possible versions of the tilting mechanism I have beem toying with in my very informal test stand. Here are some pictures of the one I think will work the best. This is pretty much like I think it will be on the actual trike. The orientation on the outer tilting assembly may change a bit but it will be very similar to this. The shocks that are visible should be the ones I use. The tilt arm on the center shaft will be very similar. At this point I have gotten the general outline of what I want to do sketched out in my mind. I have another bathroom to work up and a garage shop to work up before I get back to this little project. Time to get some of the things I put off during the winter done so I can get back to the trike. The things I have been figuring out lately have been the way to get my steering kingpins made and I think that by using a female heim joint and a longer bolt with a spacer to hold the extension of the...

Recumbent tadpole trike: Posts on Velomobilforum p.4

Recumbent tadpole trike: Posts on Velomobilforum p.4 In response to Wolf and Hein, First Wolf's comment. What I am aware of is that there are quite a few tilters that do not use a monolithic steering system and have in fact decoupled the tilt in order to get the system to be stable. The brake application to the tilt is in fact an effort to stabilize the tilt. I am just before work here and have very little time to comment but I will try to cite examples later. Below is a general view of the Aileron tilting trike made by Wayne Soohoo it is pretty obvious wher the trike tilts. He controls the tilt by using a brake released with the steering handles. This is what I based my thoughts on for the theoretical spaceframe tilter. Instead of a remote release I think something like a direct brake would work as well. These data where gathered from http://jetrike.com/prior-art.html#Kurvenleger There are a quite a number of swing arm designs at this site. The above is the c...

Recumbent tadpole trike: Posts on Velomobilforum p.9

Hello Hein, Titan Wolf, Stefan, and trike like! I have been doing a few things in the last few weeks that I want to share. I last posted with some sketches that showed how I thought a potential tilt steering mechanism might look like. After reviewing the ideas and models I had previously made I made up the following models. The first is the basic geometry of a tilting assembly using Heim joints (Rod Ends) for the bearings. Heim joints are a bit of a departure from what I have been illustrating but would seem to be superior in some ways to thrust bearings. I do have dust covers for the bearings but they are not shown in place... Without the reinforcing structure necessary to hold the arms in place, as my previous post shows, the tilting mechanism will fold far beyond the furthest limit that might be used on the trike when tilting. I show this just to illustrate the potential. The furthest practical tilt would be somewhere near 45 degrees on a trike like this. I had ...

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