thanks guys for digging up the pics, and link; very inspiring!

Doing some testing of my own also. Mamba 25 does run on 5s:027: ! Current test rig is an emaxx with a 980KV Himaxx 2808 1.83 oz. 8amp. cont 12amp burst. gearing 66/12 takes of well in 2cnd gear. gearing 66/16 2cnd gear cogs terrible from dead stop, but If I take of in first just to get rolling second will pull strong from a crawl even on a hill. Testing was a gradual 6 nimh lowest gearing, 3s, 12 gp 3300, gp's + taller gearing, 5s in first, and finaly 5s in second. 5s with 66/16 cogs some even in 1st when the battery is fresh of charge:002: . With 66/12 is very smooth, but packs were not fresh, need to top of packs and test again. Top speed with 66/16 should have been around 10 mph. Motor always stays cool, speedo does good even in grass. the only times the speedo heats up are, cogging, pulling up against side of house and lighting up tires on brushed concrete (full throttle 1st gear temp gun aimed at speedo the whole time took a few seconds to come to 180, then overshot just over 200f still ok) , and climbing the hill at very low throttle inputs (full throttle repeated passes are fine even in second+tall gearing), but two crawling speed passes up the hill in second heat it up 180+. All of this testing was done with the factory shrink wrap still covering the speedo, temps recover very quickly from these situations while driving normal. I plan to put a heat sink on it if it goes beyond the testing phase. 5s definently seems hotter than 4, but air has warmed up alot to. Also I believe higher voltage brings in more amps, and when geared so as that 5s top speed matches 4s top speed amps should be close to equal will have to test more latter. 5s with lower gearing feels very smooth. tuck weighs 7lb. 7oz. with old 10c 5s 1800 + reciever pack. I think it could push 20 mph in a light 10th scale if I had enough gear. This is not the motor I intend on running; it's the only motor I have that will take 5s, just trying to get a feel.