I made this seat support piece and mounted it on the frame. Then I stood out to the side and looked at it ... Then I went inside and brought out a long length of chain ... Put the chain around the large gear on the back and stretched it up over the top chain roller ... there's a problem ... it's pushing upward against the seat support unit.
I also saw that I couldn't mount the brakes on the top of the frame ... same problem -- chain conflict. Which means I'll have to adjust the rear dropouts forward ... I haven't welded them on yet.
Here are the two seat support units side-by-side. The one on the right will provide enough chain clearance. If you are wondering what all the little tack-welds are for ... I found that if I use a single layer of EMT tubing, it bends when you sit in the seat and move side-to-side. So, I split the tube down the center ... took one half and using a hammer to tap on it on a round section of tubing. This flairs the outside piece so that it will fit snugly against the other half. Then I tack-weld them together and they make a much more rigid seat support tube.
Here all by itself is the seat support unit that I am going to use. Good thing I didn't start drilling holes in the main tube yet ... I'll use this as the jig to drill the holes for the bolt that will lock the unit firmly in place at the proper distance for the new owner.
Here the main tube is clamped in the jig. The black forks on the left will be used for rear forks. Notice that I cut the head tube off about 3/8's inches below the bottom bearing support. This is so that I can use it for a steering unit in another project. And leaves enough room to weld the tab on it below the bearing to connect to the front forks.
I still have to mark and drill the holes near the rear of the main tube (on your right in this foto) ... and build the block to hold the axle-end of the forks in position when I clamp the main tube on the other side of the jig to weld the forks to it at the proper angle (those two empty "u" blocks over there will hold the main tube with the bottom bracket hanging downward over the right end).
Here's the view from head on ... You can see the front forks (purple), Bottom Bracket for the front crank (silver), the front derailleur post (blue), and the chain rollers (red).
Here's a 3/4 view ... What's missing are the rear forks at the other end of the main tube. The plans recommend chromolly tubing bent 90°. I have EMT tubing, but that didn't seem very strong. I'm still working on them ...
Here's a right side view ... the rear forks attach to that left end of the main tube.
It seems I can never have enough Recumbents ... made 2 Bentech LWB's, 2 Bentech SWB, 1 Toureasy clone, a LWB lowracer, 1 Mach2, 1 Mach3, 1 BMX SWB, bought a Sun EZ-Speedster, made a DeltaWolf trike, a LongJohn cargo bike, a cargo trike, and a AZ Warrior trike. I LIKE USS! See some of my bikes below ...
Due to the intermediate jackshaft, this flies as fast as a 26" rear wheel. (co-designed with S&B Recumbents - no longer in business)
Bought the Bentech plans, made the jigs, and made this from a Huffy Mtn bike & a muffler pipe. I extended the maintube 2" behind the front wheel. It handled nicely and became the bike I rode most because of ease of transport and visibility in traffic. (Bentech no longer in business)
My Wife loved her LWB Bentech ... as you can see by the smile on her face!
TourEasy Clone (found plans on internet). Early on, Gardner Martin did sell plans. Later, he went to selling completed bikes only. Used this bike for about 14 years. Recently I've been pulling parts off of it to use in other projects.
SWB Fully Suspended Mongoose BMX - this was the first "Fully Suspended" type recumbent that I built .. by adding the front boom onto the BMX bike and changing the seat. Needed a stiffer spring suspension in the rear ... everytime it flexed, the bike changed gear due to the change in chain length. That was kind of disconcerting ...
Sun EZ Speedster CX
This is a much maligned SWB recumbent. I love it! And have had many enjoyable years riding this easy steering bike.
Venice Beach Trike
Jack Baker (S&B Recumbents) made this for my wife, a couple years before he died. She needed something more stabile than a 2-wheeler. Despite the high CG, she has yet to fall over on it.
Another Bentech design SWB
I was building this for a guy, and actually rode it. But he changed his mind, and it is still in the shop.
AZ Delta Trike
I was going to build this racing trike for myself ... but the wife gave it to a grandson. So I put 20" wheels on it instead of 26". The grandsons fight over this racing delta trike. I really like the square tube building concept. Easier to align things.
Modified Delta Trike
Totally changed the rear configuration so the rider sits higher ... and mounted a rear luggage rack that I made
Long-John Cargo Bike
Built from plans on Toms Cargo Bikes website ... still need to hook up the steering and go ride it. ...
Dutch Cargo trike
Great way to go grocery shopping!
built based on A.D. Carson plans
AZ Warrior trike
Love riding this now! (Plans from Atomic Zombie). 26" rear wheel, 11-34 MEGARANGE 8-speed cassette on the rear, 22-32-44 cranks on the front.