This is a rather funky-looking design, again in the dual 406 SWB configuration. Note the mid drive attachment, a 1/2" diameter tube that is riveted between two bulkheads in the main structure:
Here is the seatstay attachment. All 3 brackets are made from 1/16" 6061-T6 plate:
And here is the chainstay attachment. The main bike structure is extended backwards a bit to avoid making the stays too long, on the theory that the large rectangular cross-section monocoque is more rigid and lighter than the stays, so we use it as far as we can till we get very close to the wheel:
Removing the right hand mounting bracket and skin, we get a clearer view into the structure:
Here is the seatstay attachment. All 3 brackets are made from 1/16" 6061-T6 plate:
And here is the chainstay attachment. The main bike structure is extended backwards a bit to avoid making the stays too long, on the theory that the large rectangular cross-section monocoque is more rigid and lighter than the stays, so we use it as far as we can till we get very close to the wheel:
Removing the right hand mounting bracket and skin, we get a clearer view into the structure:
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