I charge six of my 6S 2700mah packs in 20 mins
If its taking you that long then you must be charging at a 1c rate. See if you can charge your packs at a higher c rating. Something like 5c max. If so then charging one 3s 2200 pack at 4.2 amps will be safe and will speed things up a bit.
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Yes I must increase the charge rate, my charger can handle 5 amps, and I use a PSU off a PC, think that's about 30amp at 12 volt... Does it not reduce battery life charging at much higher C?
Why don't you just change your Whiplash to Gas?
I have a guy I met off youtube that has a bergen gasser he said it is usually bout 2000 everytime it crashes.... he told me it is the type of heli they used to film parts of the first Spider-Man