PBR-31 Buoyancy problem

[rascal24]

While surfing through Flightsims site I came across a FS2004 River Patrol Boat PBR-31 by Tim Conrad. I dropped it into my FSX Simobjects Airplanes, loaded it up and everything was correct until I went to into Free Flight mode. As soon as it hits the water I get the "Splash", so I reloaded only this time put it on the runway and everything was fine.  Then slew it to the water and got the same "Splash". Any Ideas on how to correct this?  Want to give it to my brother who played with these on the "Delta" back in the days.