Novak HV 4.5 any good?

I have one in my E-savage.....

And it is fast but you do need to gear down lots (as Neil said) to keep the motor cool.....

Its not a good motor for BIG trucks thats for sure......I would not put it in anything larger than my little E-savage....

In a BIG truck at 14cells (max input) you would kill one pretty quick i would say...

Just my 0.2 cents worth...