Thats sounds like it would work: running 5s for smaller tracks and 6s for larger tracks. But my Serpent has a saddle pack setup so that might be hard.
Interesting note. At a recent race, on what Europeans might consider a medium/large track i was running my buggy on 1400kv 6s and my best time was 29.45sec. On my truggy I had 1350kv 19.8v LiFe pack (which in my boats felt like a 5s LiPO) set up which felt much slower and was mathematically at least 10% lower rpm. Yet, I was still able to pull off 29.43 with that truggy. That truggy was so slow that on the straights people were passing me something bad, it was my 2nd class and I just ran it that way as my "for fun" class. But as you know truggies are big and very easy to handle so even though I was much slower I was able to get virtually the same lap times as my very fast buggy because on the infield i was smooth as ice and ubber stable. Sometimes we need to remind ourselves that too much speed results in excess wheel spin, excess brain power directed towards keeping the car in check/stable and not on making turns and jumps smooth. This was on a track in America so those kv numbers may not apply but you get the idea.
Side note: LiFe packs, run at 3.3v instead of the 3.7 volts you see with lipo (3.6 at full charge/cell for LiFe batteries). The Iron Fe in LiFe packs are heavier than lipo per MAH of capacity but you have more usable MAH since you can run them down to below 3.0v safely. Since you can use all of the available mah you do not have to run as large of a mah pack as you would with a lipo. In some tests I ran the cells down to 2.2 volts and no puffing. But vehicles were slower and selection is bad vs. lipo. Might be an option for people who want to get a noobie a basher car and do not trust them to manage lipos safely. Keeps the speed in check and the fires away. Set Lipo cut off on ESC at about 2.8-3.0 volts/cell. Setting at 3.2v/cell will trigger Lipo cut-off prematurely as current spikes will touch that frequently with a battery that has an average voltage of only 3.3v/cell. Voltage curve is very flat, when it dumps it dumps FAST. Just an FYI guys in case any of you were wondering about LiFE packs.
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