Jim Wilkins wrote:

John Doe wrote:

How far-fetched is the idea, to use a propeller or jet engine
(radio controlled type?) to push an in-line skater? ...

Diesel engines with treads:
http://blog.modernmechanix.com/mags/...ead_skates.jpg

Thanks for the picture. Sloping upwards in front would help too.
I have mentioned that possibility with my big front wheel skates,
but had not seen any attempt like that. Skating over rough terrain
has many possibilities.

http://www.flickr.com/photos/27532210@N04/3056505603/
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jsw