Recently in testing for time trials with P & Q outboard tunnels we tried a 4S and 6S setup on the same hull with 1515 1Y & 1.5Y Neu's. Same 2500watt motors 2200 & 1500 kv respectively and same esc and timming settings. Normally for Q we use a larger hull and 1600kv 1521 Castle power but for 1/4 mile the lesser 1515 handled turns better. Anyway unloaded RPM for 4S is 32560 and Q at 33300. Using 45c/5000ma Hyperions the only difference is the single 4S pack vs 2 3S 5000's in series. More weight and potential enery in the 6S setup. Speed and times were very similar with the edge going to the 6S Q setup using the same props. The 6S could pull more prop pitch and diameter giving it a further top end edge. (2-3mph) As was previously stated the 4S created more heat. If i were not concerned with class requirements I would run the 6S using the same wattage motors. Not a tripple blind test just my observations.
Mic
Mic Halbrehder
IMPBA 8656
NAMBA 1414
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