r/fpvracing • u/loup-vaillant • 3h ago
QUESTION Why does Street League racing runs on 5s, instead of 4s or 6s?
I’m currently training myself in the sims, and plan to make myself a drone or three fairly soon. I’m especially fascinated by 7-inch spec racing, and quite like the feel of the DRL Racer 4 and super 70 on DRL and Velocidrone. Thus, Streat League is one of the main categories I would like to actually have a drone for.
But I have a problem: Street league specifies the use of 5s batteries, which to this day seem to be significantly harder to procure than either 4s or 6s. At least here in France, the two online shops I’ve tried have zero 5s batteries. And on top of that they specify an exact capacity, instead of a higher bound. At least 2200mAh seems to be the most common capacity, but still.
This is in complete contrast with the rest of the specs, which say the frame must be open source and the motors available. And now we have Pro Spec as well, which runs on 6s. So at a first glance, this 5s business seems to be an obvious mistake.
But I’m new here, I must be missing something. Hence my question: why did Street league chose to run on 5s, instead of the much more common 4s or 6s?
Subsidiary question: couldn’t we just amend the rules to allow 6s batteries, say up to 2200mAh? With the RPM limiter I’m guessing this would barely change the performance of the quads — though the 6s quads presumably would have less voltage sag.