Flywheels / NEO Retrieval

>

> The big question, would a flywheel (or other similar device) weigh
> more than an engine and fuel to do the same job?
>

You should be able to answer that question yourself using freely
available resources on the web.

To save you a bit of time, here is a list of companies who make
spacecraft reaction wheels and momentum wheels:

ADR http://www.adr.fr

Teldix http://www.teldix.com

Allied signal http://www.alliedsignal.com

Honeywell http://www.honeywell.com/space

Ithaco http://www.newspace.com/ithaco

===

As for an equivalent rocket engine, it depends on the type of engine you
have in mind,
in particular you need to consider specific impulse (exhaust velocity).

Good luck.

CR.

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