Hydroplanes are cool vehicles with all round compatibility......
You can fly them in air, float them in water, run them on land.
Here check out this video.

looks cool
however making such hybridf doesn't seem to be difficult for those who have made airboats,just attach a landing gear which would submerge in  water when it is tun\rned into a boat

seems like u like making things.
then what about this

sorry, but i saw the message regarding embedding code afterwards

Fixed the link

And here is a big hydroplane from RCPowers.com

This is really really BIG and good. It has good stability.

thanks that the link was fixed by anwar bhai
i was sitting in a cybercafe yesterday and when i clicked the link the computer got mad and i was unable to even log in..

btw has anyone here built a 3-1 hybrid vehicle[runs on land,air and water] or 4-1 with a submarine function also?

this too is cool!!!!