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Sounds a lot like what I do in RC racing. Back in the of Brushed motors we'd retard the timing and re-shape the field using Neodyniums on the outside of the can for more torque on the tighter tracks. Yet for the longer, faster open track when we were limited by gearing I'd advance the brush timing and neo the field mags for a higher rpm. the difference in run time between a 'close track' motor and and 'open' on a medium circuit? 5-10% on NiMhs -'bout 5% on LiPos.
Good luck mate
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good things come to those who wait, sh*t turns up pretty much instantly
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