Put me right please????

[MARKY C]

I have been told that a y wind motor would have higher low end torque than a d wind motor which would have a higher top end torque. What i want to know is would this differance in windings really show up much when on the water or not?? Thanks for any replies...............

[NativePaul]

No, KV is of much more importance than the winding method to get that KV, a lower KV motor whether "D" or "Y" wound will have more torque for the same amp draw and thus can spin a larger prop than a higher KV motor which has less torque for the same amp draw irrespective of being "D" or "Y" wound and thus has to spin a smaller prop to maintain the same amp draw, but being of higher KV it does spin that smaller prop faster.

Many times I have heard people on forums saying that "D" winds are amp hogs, yet this is not true, any motor whether "D" or "Y" wind will only pull as many amps as it needs to produce the torque required to spin its prop, if you use a small prop it wont pull many amps and if you use a large prop it will pull lots of amps, I have 5 Neu motors and all are of "D" wind, not because I don't like "Y" winds but just because coincidentally they all happened to be closer to my ideal KV than the closest "Y" wind was in the size of motor I wanted. I race to Naviga rules which call for a 5 minute run time plus 10 second mill plus in lap which requires about 5:30 run time and you are limited to 280g of LiPo per 2s in the class, so my cells are currently between 5000mAh and 5800mAh 1P which puts my average amp draw in the 54-63A range (assuming I totally empty my packs so it will be a little lower in practice) which is far from being an amp hog setup, but I know that like all motors if I prop up the amp draw will rise, I do that to one of my race boats and sprint 5 laps for fun like you guys race in the states and I pull 150A with the same setup thats normally nearer 50A just by fitting a bigger prop.

Being an amp hog or not is about running an appropriate sized prop or not, with all motors whether "D" or "Y" wind.

The main difference is that with a "D" wind being around 1.7 times higher KV than a "Y" wind with the same number of turns (sorry cant recall the exact number) so for the same KV you need fewer turns in a "D" wind which in turn means you get more copper per wind, and with all that copper it can cope with more amps (for a limited time) than the "Y" of similar KV so if you were to overprop drastically and pull HUGE amps the thinner wire in the "Y" wind may let go before the ESC blew whereas the thicker wire in the "D" wind might hang on in there until the ESC blows, both are pulling the similar amps and somethings going to blow in both cases, but what blows wont necessarily be the same.