One thing I took away from owning my Bacchetta was that I really disliked Over-the-seat-steering (OSS), and would greatly prefer under-seat-steering (USS) on any future recumbent I'd own. I looked at a bunch of the current commercially available trikes, especially looking at how the USS versions were set up, particularly how the wheels are mounted. Ultimately it seemed like the best starting point to keep reverse-engineering to a minimum was to start with the Warrior Trike plan since it incorporates USS and all the hard work is done in terms of figuring out how to construct the whole joint where the front wheel hubs meet up to the frame/steering mechanism. Now, where my plan differs from the Warrior layout is that I intend to make all three wheels be 26" diameter with the base wheelset being 26x3.0 WTB Ranger tires on WTB Scraper 40mm wide rims. The rear wheel part of the frame is going to be built around a 170mm wide axle so that I can have the option of running a Rohloff hub at some point, but the preliminary drivetrain is going to be based around some kind of wide range cassette - mountain bike type either 9, 10, or 11 speed.
Besides being for carrying cargo around on city streets, I wanted this trike to be handle to light off-road riding. Mind you, not shredding singletrack or anything, but I wanted it fully capable of handling rough roads, gravel, or semi-off-road double-track type stuff. Also, being to run full-fat 4.0 tires for winter/snow riding was also a plus. I plan on having this trike be not only a practical cargo hauler capable of hauling tools, building materials, etc, but also capable of carrying camping gear, as well as more esoteric things like my 8" Dobsonian telescope, or things like cargo modules for carrying refrigerated foods, or things like small kegs of beer as well as having custom beer tap/serving setup. There are a lot of things like this that I'd conceived of with the bakfiets, but there are issues with the stability of a two wheel setup when heavily loaded, not to mention my initial frame design is bit more flexy than I care for which is why I'd been planning a v2.0 pretty much as soon as v1.0 was done!
My design is going to have the cargo platform placed behind the driver's seat and just in front of the rear wheel. The plan is make the platform just big enough to accept a couple standard size cargo items such as a jobsite tablesaw, the current toolboxes I use, or a standard palletized shipping container. To increase the space available and the versatility of the cargo hauling I intend to have the bed feature extensions that can be deployed to allow carrying long items such as 2x4 lumber in varying lengths, raw steel tubing for welding projects, etc. The rear will also feature a hitch mechanism to allow me to tow my 6' long cargo trailer. Of course being as this will be e-assist I will also be incorporating storage under the bed area behind the seat for some larger capacity batteries than my current battery. My current battery does at least give me upwards of 60-80 miles range, and my current bike weighs about 90 lbs. I imagine this cargo trike is going to weigh significantly more than that though.
Another major reason for undertaking this new project besides improving on everything about my v1.0 cargo hauler, I see a trike as being a far more stable platform for cargo and the concept I have in mind lends itself FAR better to some of the other car-free/carbon-free/carbon-neutral concepts I want to explore with stuff like the solar charging, and just generally creating a human-powered vehicle that can be shown to be an adequate replacement for the average truck/van. Obviously not capable of being a completely 100% replacement, but more as an exploration of the concept and a test-bed for a lot of different technologies.
I guess besides announcing the idea I wanted to get some input and see if anyone had any suggestions or cautions in regards to adapting the Warrior Trike design to what is essentially going to be a mid-fat/full-fat extended wheelbase tadpole trike. One thing I'm already thinking of is braking. Large rotors all round, probably 203mm for each wheel, and potentially TRP Hy/Rd cable-actuated hydraulic calipers for all wheels. I'd like to have a single brake lever actuate both front wheel brakes, but I don't know yet if anyone makes a lever that has adjustable pull. The TRP Hy/Rd use the short pull typical of road levers, while most of the dual-pull levers I've seen are for long-pull calipers like Avid BB7s or the TRP Spyke mechanicals. I had Spykes on a past bike but didn't like how much regular adjustment was necessary to keep the pads braking properly. The nice thing about hydros is that they continually adjust themselves so braking force stays constant throughout the life of the pads. Anyway, enough jabbering about my plans. I hope to begin construction in the next few weeks or month or two. How soon I get started is going to depend on my access to getting some steel tubing as I only have some limited materials right now most of the sizes of stuff I've got aren't suitable for this type of project. Anyway, I'd love to hear any thoughts or suggestions.