1 a you tube video on Inducion power transmission using 2 copper coils same # of turns (keeps the voltage raito the same 1:1 . If you go 2:1 you get 6v or 24v. Theas 2 coils play catch with eletrons accrost an air gap.
Put 1 above and below on the piviot shaft.
https://youtu.be/TYA8wq7YYdI
Caution
Doing this with AC will cause heating down to to just under 60Hz. A frend did some damage with a 100' coil of extenchen cord and a table saw. Some one put a mettle trash can on the floor in the middle of the cord. Thinge got hot .. at low amprage (the thing gos for how many days on 3 AAA's?) And dDC may be fine . Down side is that DC will magnetizethe steel shaft if to close.
At this point you posted the 2nd post
2 nose cone made from fine chain male. Use piano wire from The Hobby Shop. ( various gauges/spring rate case hardened spring steel ).can hold the shape of the male. And be triped/cycled for a long lime . Especially if set up as a fulcrum . Like a bow less the string. Pull the top tighter to increases the preload(non deflection air speed). The bottom of corce would be restraining against the other springs . Curves like a tail wing root could be acheved by a good chain male maker.with pleating .
? Would it be better to make the leading profile more houre glass shaped?
The chain male idea may fail in a montana winter load up with ice to were the only way to move from impact is to bend the rings.
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PS
How bad could the rudder/pant wind vain effect, affect handling with sever side wind loading 70mph gusts could see the caster be less of a force than the wind load . As the tire gets further off line from the direction of travle it cams down gaining traction by lifting the tail like steering a red rider wile pushing it back words. In realy bad crosswinds or tailwinds could cause sheding vortexes to amplify this to shakeing your tail fethers like the shoping cart crazy wheel. Even at unnoticable levles will accelerate tire ware and reduce FE on a pairabolic with wind speed. .
Picture a dead strate high way wind 90°to travle pick a side . The wind is making small drifts of . Your choice sand or snow. Ether way you have moving oscillating bars of enough Grit to cause good traction and bars of zero traction. For the snow example were the wind has blowen all the snow clear to the blackice that is the 0 bar the small drifts are the good traction. 25-35mph forward and 40 from the side on the ice patch every 3' it would turn side ways to face the wind. At times the oscillations would time out so that both axles are on snow. Next both truck axles are on ice the only axle with traction is pointed at the wight line . This could get real sketchy real fast. Not so bad in Texas. But the sand, dirt , leaves can all be substituted with there own unique tendancys, just higher ahead air speed. None as bas as this worst case senerieo,on ice. .
It would taks a camera back there to see what its dooing at road speed and dynamic yaw air flow. And shedding vortexes off the truck tires. This is how I found a g force induced rear steer dynamic yaw in my dodge, 26 years and< 300k mi former farm truck wada expect. Turn left to go right.