Finished reading posts and sources I could find from this thread:
I must say this is amazing how much work people put together here.
As it is with cooling electronics, most of the principles here are the same.
There are a few key differences:
- Capacity of the stator is going to be the same or bigger than the shell. Making cooling the shell very inefficient,
- The resistance between motor and the shell is incredibly high due to air isolation. Static wheel would sit warm while the core is overheating.
- Heat transfer between the two is only efficient when wheel is spinning. With or without statoraid. (I guess more with the ferro-fluid as you are losing most of the benefit and gaining nothing).
- 10 liters of water would keep the motor cool practically forever. By the time you are done riding the water canister would be ready again due to losses. 2 liters is more than enough for a cooling break.
Back to your original question, weight added by the lipo, fan would not have measurable impact on a stationary wheel. It would be like blowing wind on a house with decent isolation. You are probably better off bringing a stand and touching the throttle once in a while