Running a feigao cool on 50-55mph is a tall order, but it could be done with a high voltage setup. Something like a 1500kv motor on 6s or 18 cells would run a fair bit cooler than a 2000kv motor on 4s or 14 cells. I would suggest you need:
MGM 120/18 or 160/18
RCM motor clamp/heatsink
5mm bore 32pitch pinions
5.5mm gold connectors (3 male, 3 female).
That should be all you need- gearing info in BrianG's signature.
The feigao/wanderer/nemesis 11XL is about right kv wise, otherwise you are looking at the more expensive Mega motors, or the V-twin which should work fine, but as has been said often enough- it isnt ideal for continued use, more for speed runs. If you can wait until the end of march or so the MMM will be released hopefully, and that will be a solid 4-6s (18 cells max) lipo performer. $300 for a single excellent system is better than about $300+ for an experimental one in my eyes... personal choice though.
I'd bet money on it being faster, but it all depends on gearing & how good your batteries are really as to your top speed. That said, how do these numbers grab you?
2.8461538461538462
Transmission Ratio: 1.7222222222222223
Other Ratio: 1
Spur Tooth Count: 66
Pinion Tooth Count: 22 Total Voltage: 21.6
Motor KV: 1668
Tire Diameter (inches): 5.75
Tire Ballooning (inches): 0
Motor Current Draw: 0
Motor coil Ω: 0.0114
Spur/Pinion Ratio: 3 : 1
Total Ratio: 14.70513 : 1
Tire Circumference (inches): 18.06 inches (458.83 mm)
Total Motor Speed: 36028.8 RPM
Vehicle Speed: 41.91 mph (67.32 km/h)
Effective Speed Rate: 1.94 mph/V (3.12 kmh/V)
Estimated Adjusted Speed: 40 mph (64 km/h) - 5% loss
Effective KV Value: 1668
I see Brian has been tweaking again, I like.
36,000 rpms is just about perfect, but that will drop a little under load obviously, but you should be good for a solid 40-45mph or more with good temps, just remember to check them duting your run- anything over about 120-150 is too hot, but less than that is fine.
hmm my novak give me 42-47mph and 10 mins then got hot so if i go with XL10 i will get same speed but with run cooler.
I need more speed :) i can spend $400 for mgm & motor and $200 for good 18 cell so i just have $600 if you were me what you go with with this $600
Tough call man. I'd probably spend $300 on the MMM when its released, and spend the rest on some good batteries. The 2000kv motor the MMM will come with initially will be a blast on 4s, scream on 5s, and fly on 6s, though it may run somewhat warmer obviously. if you can wait a couple more months, I'd say that was a good route to take- just put your name down on the mailing list to findout when the MMM is ready for release and pre-order it (Joe Ford posted info somewhere, search his recent posts).