He's not talking about hydroplanes, he's talking about hydraulics. They do make model kits that act as if they have hydraulics on them, do a search for "hoppin' hydros", or ask at your local hobby shop. I know Hobbytown has a bunch of the kits, with old Impalas, etc. They are 1/24th scale, so they are almost the same size as an XMod.
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-- It is by will alone I set my mind in motion...
RS had an impala with hydraulics i'm sure you could rig it up...
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Flat Black Supra
-Engine
Stage 2 Drift motor
-Exterior
Flat Black Custom Paintjob
Blue EL wire underglow (ordered)
Command Logic Lights (x2) foglights & extra taillights...
5Zigen Wheels
-Other Mods
AWD