I have built a few 4S quads and just ordered the Catalyst Machineworks 5 inch Shocker HD Tank and am wondering if I should go 6S or not. What advantages are there for 6S??? I am using the Holybro F7 stack and it works great for 4S but I hear I have to use a regulator for the AU and am wondering if I should just stay with 4S because I already have everything setup for 4S. Also wondering which motors I should go for???

Thanks

Don

Everyone is moving to 6S these days so it seems to make more sense to go with 6S, especially if you already have experience of flying quads. You can always scale back the throttle if you want to dial back the power. Get 1800KV or 1950KV motors. You will then also be able to use them with both 4S and 5S LiPos, as you want to. Those motors will be quite tame on 4S but still perfectly flyable.

If you have no 8V, 9V or 10V output from your ESC or FC then yes, you will need to get a voltage regulator for the DJI Air Unit. Alternatively use a Caddx Vista in the quad which can take 6S voltage, but you won't get onboard 1080p recording. Only 720p recording to the goggles. That might not bother you though.

Thanks, that's what I was leaning toward, I just wasn't sure.

Keep ur 4s motors and scale them down.. Ciotti is constantly touting “get the highest KV motors and scale them down”... he has 2 glide quads, one with 6s motors and one with 4s motors.. with them “scaled” he can’t tell the difference ..

(02-Mar-2021, 06:49 PM)Rob Axel Wrote: Keep ur 4s motors and scale them down.. Ciotti is constantly touting “get the highest KV motors and scale them down”... he has 2 glide quads, one with 6s motors and one with 4s motors.. with them “scaled” he can’t tell the difference ..

I know you mentioned the scaling thing in a different thread. But what do you mean by scaling down? You mean throttle scaling?

I melted an Ethix Silk motor on 6s so don't do it. They get very very hot so buy the correct motor. It went really fast though and sounded awesome before it blew

And yes 6s all the way. Less voltage sag and now days the batteries are pretty much the same price and also weight as you can reduce the mah to get the same amount of power battery which gives you less sag (i've said that but it is very noticeable) so a winner.

(06-Mar-2021, 01:21 PM)ethr Wrote: He probably means to put a throttle limit, not sure if it works great...batteries will suffer, motors will get hot. A friend from our local group is trying to do a long range with 4s motors and 6s li ion, but I haven't heard, that he is having flying experience.. maybe I'm wrong(not an expert at all)

If this is the case, then it really does not make sense. A winding that is not meant for 6S will likely burn even if you limit the throttle. I have not tested this myself, so I can't confirm whether this works or not.

6s liion for longrange on 4s kv can be for a different need, while liion does sag alot from low c-rating and is empty at 2.5v per cell, the true voltage is lower than on a lipo.
a 6s liion will be empty on 15v, in the 4s range. the big difference might be the wh he can use thisway, its 1/3 more battery and 1/3 more battery weight. it depends on the sweet spot about efficiency oc the build what will give better flighttimes.
it can make sense to choose a higher cell count for liion compared to lipos..

there is no performance by the liion, i guess it wont burn a motor xD but a 4s lipo will provide much better performance/speed regardless lower voltage.

You can run 6s and 4s on the same quad using the motor output limit in Betaflight. Once you have it set up, the quad detects the battery voltage and adjusts the motors so you get the same rpm with either battery. I am a big fan!

Looks like I was tottaly wrong and thats a nice video! Damn, I've missed some super cheap 4s xnovas