I will add all these to my for sale thread when they are manufactured and proven.
Here is the concept for the YuNu adapters. (note only for 171 series and developers kit. Not sure about 360 yet)
There will be 3 types of Nuvinci adapter for the Yuba.
1, YuNu keys. These simply fill in the missing space in the drop outs. They would be fine for pedal only setups or 300w or less setups. Also provide for chain tensioning. Needed to position the axle with the following torque plates.
2. Static Torque plates, like the plates for standard motors, only cut to suit the Nuvinci. You will need a chain tensioning device with these. Suitable for hi power setups. Good for mid drive setups if you can shift the motor mount to tension the chain.
3. Tensioning torque plates. These allow for the tensioning of the chain in high power mid drive applications. I will release these for standard rear hub motors, for use as single speed.
Keys shown below.
Tensioning torque plates
Now, the reason the adjuster has indexing is so the weight of the bike always pushes the reaction plate against the frame tube.
If it was just a slot, then the reaction plate could slide down, effectively useless. So when you set it to tension your chain, you choose the index below so the plate pushes on the frame before the chain tension stops it from moving.
Not sure of cost yet. The keys will be cheap, the static arms will be about $40 a pair including the keys, the adjustable ones probably about $50 a pair. So not too bad.