I remember once reading of a Mk 15 or 15.5 modified with a fan in the loop to help with the WOB while DEEP.

Has there been any significant work along these lines to create an "assist" to help when not in ideal position or to compensate for other WOB issues?

This seems like a good avenue for sidemount cave work where your ability to adjust position is limited.

Any knowledge or experience on this idea?