Browse around here and you will find several high speed tadpoles
Endless-sphere.com • Index page or google electric tadpole trike.
I understand they are hand built drive trains but for those that like to tinker a $1,200 trike, a $3~500 hub motor and whatever Lithiums you need for range will halve the price with similar speeds.
Unless the road surface is good 30 mph continuously gets tiring with no suspension.
And from what I have read they would be illegal for road use in most of the US and definately so in Australia.