Featherpluckin
Posts: 130
Joined: 12/26/2003
From: calgary, AB, CANADA
Status: offline
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Hi very good questions first of all i dont think most consider 1/12 scale either micro or mini. as for most mini means 1/18 scale and micro seems to incluse 1/24 scale and less. As for your question abpout a 100 mile an hour 12 scale rc car, well it can be done and it really isnt that hard to do, what is hard to do is control it cause at those speeds one good reck and kiss it goodbye. Just remeber your speed isnt just reliant on power there are a couple of other things that you need to consider. The first one is weight, the lighter the faster which means lots of light weight materials such as graphite, and dont forget thespeed control receiver or the servo, the smaller and lighter the better. The next thing is make sure your drive train is super efficient, which means not only bearings but the best bearings you can afford be it silicon or ceramic and follow the manufacturers directions on thier use and lubrication. Next is your motor and batteries. Good quality batteries that support a high discharge rate. If your open to experimentation try the new lithium cells out there you have two choices either lithium ionb or lithium polymer. A good set will giv you the same power at half the weight. Just keep in mind you need a charger especially made for them. as for your engine numer one thing make sure you brewak it in right, maintain kit properly, and gear it right whic means lots of pinions for experimentation, to much top end and not enough acceleration could mean by the time your car has reached top speed it may be outr of range, to much acceleration and you could find that your top speed dosnt peak out. Tjhe last thing I can think of is aerodynamics. make sure that the bottom is flush no screws haningin out. Now you have to pick a body. somthing low with as little frontal area as possible, something like a gtp works well or a canam type body. also an internal antena will cut your drag as the less drag you have the faster your going to go you will also have better balance. Lastly now you have allthis power a super ;light and aerodynamic car you have to be able to control it, so make sure that you keep the slop in the steering to the absolute minimum, and while you want a steering servo that islight as possible, it also has to be able to turn the wheels at this speed. Lstly make sure you have enough open space to wind it up and make sure its safe, you hit someone with a 2 pound car at 100 miles an hour well compare it to getting hit with a fastball with a lead weith in the center....ouch ouch ouch ouc....sothing is going to get broken.
And lastly let us all know how it goes I currently am driving a micro rs4 stock(18 miles an hour), a m-18 modified(25 miles an hour), and a brp supercar 18 higly modified with a custom fibreglass chassis, 14.4 vollt speed control, 2 7.2 volt litium ion batteries, full ceramic bearings,hpi wheel adapters, and a can am body(Ive only had this one to about 35 miles an hour but i can see it doing between 50 and 60 miles an hour, the thing is insane.
Hope this helps
Garry
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100mph? - 
