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Motorized rollerskates, how do i calculate which dc motor to use? Some better than others? Answered

I'm going to try and fulfill one of my childhood dreams; making a pair of electrically powered rollerskates.
However i'll need your help if i am to succeed!

I have decent knowledge of soldering and the electronic circuit wont really be a problem - i'll wire everything to an arduino duemilanove

So here's my questions:

1. I'll need a motor, is there a specific motor type that is best suited for the purpose?

numbers:
max loadage: 80kg
speed range: 0-20km/h (~12mph)

Something like this, but in rollerskate format: http://www.skateelectric.com/index.php?option=com_content&task=view&id=38&Itemid=45

If anyone could point me in the right direction in regards to motor type and motor calculation i'd be really really grateful.

I know that voltage is equal to velocity and amperage is equal to torque - and that torque is used as force to drive the wheels under pressure/friction.

I've done quite a lot of research already, but i always hit a dead end, nothing here on instructables seem to cover the topic regarding dc engines - and no, i'm not insane enough to power a pair of rollerskates with an angle grinder - i want to have fun, not carve up the pavement and break bones (or spontaniously combust)
ps:or this http://www.youtube.com/watch?v=HQzzjBR9Etw

I'll do an instructable on this if i get it working, all i need is help with the motor, i'll do the speed regulating myself and all that jazz.

Discussions

if only they made hub motors that small...then it'd not only work well but look nicer

Someone did do this with electric-drills didn't they?
Do you know what I'm thinking I remember?

L

I'm afraid i'm quite puzzled as to knowing if i know the thing you're remembering.

Although i did do an alternative search based on your answer and found this:
https://www.instructables.com/id/Electric-Mountain-Board/

An electric scooter motor seems a bit overkill for rollerskates though, maybe something smaller? Or maybe you remember the thing you think i know that you remember? :D

Couldn't find it. If I remember where it is I'll let you know. L

Actually the motor isn't that big...it might just work, plus if i use two they'll have to work half as hard - i'll see if i can draw up some viable diagrams.