Speed Difference, 1600KV VS. 1800KV on 4S?

[Billy Barnacle]

Are we comparing can sizes too? The spartan has a 36 mm xl can. I would think the same kv in a 40 mm leopard motor would spin a larger prop. Also have to look at efficiency. A castle motor for example would be more efficient than a hobbyking motor of the same size. The castle wil likely turn more rpm.

...Are we comparing can sizes too?...
I would like to add something to that.... The number of poles the motor has - I.E. 2, 4, 6 - it's my understanding that all things being equal, more poles = more torque; more torque = bigger prop the motor can spin.

My 2-C, pls correct if wrong.

[Bduncan]

The shut down of the motor at full throttle was fixed by requiring with 12 gauge wire and better soldering job on cap bank

[Bduncan]

Re wired with 12 gauge and had the cap bank soldered in by a pro. No more motor problems at full throttle. Just goes to show us all, boats are not an exact science.