Coil shock placement functionality

[LD918W]

New bike build.
Usually only have front fork shocks with a stiff rear.
Was thinking about using a heavy duty coil shock off of a motorcycle for a body dampener for these horrible Oklahoma roads.
Would still be nearly a stiff frame, but allow body to flex a bit if I hit a large crack.
Had originally planned on putting it in between the swing arm and the body, somewhere beneath the seat, but need that area for mounting the battery and figure it ought to stay solid. Trying to keep the frame simple as possible.
...or should I weld the frame solid with no shocks, other than the front forks?
The front tire is 26x2.85" n nearly 3" from rim. 45 psi
Rear tire is a 26x4.5" with a good 3.5 to 4 " from the rim. 60 psi , 60 thread count

 

[bananu7]

Putting the seat on what would become the swingarm is a poor idea. The shock will do nothing to isolate you from the bumps, and will complicate the construction and make it heavier.

The hinge should allow for wheel movement separate from the seat movement. Even with a heavy hub engine, that makes a lot of difference. If you can't fit the shock underneath the seat, you might want to put it like Specialized used to do, on the swingarm itself:

 

[amberwolf]

Can't really tell from your image:

Are you trying to improve the front suspension?

Or are you trying to add rear suspension?

Keep in mind that if you use a motorcycle shock, the spring on it is giong to be meant for the weights involved in that mc it was designed for. it may not respond the way ou need it to. the damper may be tunable to a degree, but the spring isn't, other than preload.

The front suspension doesn't appear to be functionally useful; it looks like the pogostick type from the very cheapest bikes (like almost everything I have around here).

If you want to improve that without using an expensive bicycle fork to do it, you can build a completely different type of frontend taht essentially works like a rear triangle type swingarm on a fork. I have at least one post wtih pics and bad drawings to show what I mean, but i can't find it, don't recall which thread it was in. IIRC there was a buell motorcycle with a frontend like that, or maybe ducati? some race bike anyway, so i know hte idea itself works.

or you can do something like this thread

A simple front Suspension idea

Dear All Your precious comments on the base of technical point of view will highly be appreciated. It just came to my mind while i was half a sleep and woke up and draw it in Pain. It seemes simple but efficient for off road conditions. it could also modified for tuning for stiff or lose for...

endless-sphere.com

If you're trying to add rear suspension, you can look here for some ideas, which I never got built to actually test

Full-Suspension Semi Recumbent Cargo Bike - NuVinci MidDrive

Yes. That latest design would be fine. You will need to find out what weight you can put on the 2 springs, to see if it will be too stiff or too soft. What about a shock to take the pogo effect out with more cargo weight ??

endless-sphere.com

but might work.

 

[LD918W]

Putting the seat on what would become the swingarm is a poor idea. The shock will do nothing to isolate you from the bumps, and will complicate the construction and make it heavier.

The hinge should allow for wheel movement separate from the seat movement. Even with a heavy hub engine, that makes a lot of difference. If you can't fit the shock underneath the seat, you might want to put it like Specialized used to do, on the swingarm itself:

View attachment 365229

Right on. I appreciate your help, and by explaining the "how n why's* to me.