RE: need EXTREME speed, what is the fastest i can buy? RTR
Most popular RTR boats I have seen are deep v's with .15's-32's or hydro's with .15's. Top speeds are usually around 35mph. If you want mind blowing speeds I would go with an outrigger. I found the 40 size rigger the easiest to setup up when compared to a 90 or 21.
I would also recommend the top speed 2. I have only set one up for a friend and it seemed very easy! As far as engines, I love the look of the K&B series. It's amazing to hear the 3.5cc OB record is in the 60's. What would be the speed record/normal racing speed for a 7.5cc OB? I find they handle more chop and look amazing on the water.
Ryan