dogman dan wrote:Ok, I get it now,, you are aiming for a semi recumbent,, or at least that's what I call it. Like the Ezee.
With my back I simply cannot ride my semi recumbent. It has the seat too close to the rear wheel, and it just pounds the crap out of my crushed disks. I need to stretch that thing, or build from scratch one with the seat midway between the wheels.
We copied my re bikes frame for Amberwolfs trike. easy to do. This would be a great bike with about a foot longer behind the seat. Been thinking about an attachment that adds a foot, including some crude suspension. Then stokemonkey it, and build a giant trailer for it to haul.
Yeah, I guess what I am building would be classified as a semi-recumbent, but I am curious, with the bike pictured you have a very straight up & down back rest, and correct me if I am wrong, but that would still have the majority of the rider's weight on the saddle portion as opposed to the backrest?
I am still developing my design, but I don't have as a severe back issue as you Dogman, so I wouldn't dream of saying what would be best for you, only you know, however I am curious if when sitting on that bike if you are able to steer with just a pinky?
If not, I would encourage you to try a more true recumbent seating position, where you really have your hips and shoulders being suspended, and you steer as much with your hips as anything, because they are supported in a way that really is very different from a typical chair, more like a recliner.
However, I hope to be able to keep my current bike's style and ability to have my feet down & out while riding, but when I lean back, I am supported by a very cushy hammock style seat, and any bump I come across is absorbed by the springy give of the webbing of the recumbent seat, as I am really in more of a suspension seat than something truly solid.
The only draw-back of this seating position is on some recumbents, it requires the pedals to be higher than I find comfortable, that is where I am compromising so that I can have more of a "lazy boy" recliner position (before you put the foot rest up high) or recumbent exercise bicycle you find in the typical gym or fitness center.
On my Vision R40's seat, there is also a memory foam pad in the mesh for the "saddle" part, and the big benefit of a mesh seat is it also breathes! So if you sweat (I love to pedal so I do!
) it is more easily allowed to evaporate, keeping me dry, so I never really need those "bicycle shorts" that is typically used, just some comfortable breathable MTB or other style shorts with moisture wicking underwear & socks (merino wool socks & quick-dry underwear & jersey under however many layers I need for cold/wet weather) and I really have had no issues.
If it is needed, I could always incorporate a sort of shock system for the seat mount, and I will see what is available first, but there is no reason I couldn't build the frame with a 1 1/8th" head tube instead of the typical cruiser 1" to allow for more suspension fork options, but of course my design will take a different style with much more angle to the head tube, which also gives some flex along with the long frame.
A friend has an old school girder fork he wants to show me for the current bike, and I might build something similar, but I am trying to avoid too many custom parts other than the frame & motor mounts.
That is part of what I really enjoy about mounting a hub motor this way, it's already designed to go about the RPM you want at around 48v or so with the typical winding, is nearly silent, and uses the bicycle's gearing.
I prefer IGH's and will probably be using a Nexus or Sturmey Archer (Sturmey's RX-RK5 5 speed http://www.sturmey-archer.com/en/products/detail/rx-rk5
is looking very promising!)
I will just need to make a custom cog/sprocket with freewheel carrier as with the NuVinci one I use now to allow for separate pedal & motor gearing, as I prefer to have a separate chain for the motor, so that way your pedal chain isn't going to see as much increased wear.