i build quit a few corplast hulls that are great ground runners [8D]
this is a pic of the bottom of the very first hull i built after about
2 gallons of fuel ran through it



i started with no runners than added 2 than added a third one in the center, after more running i ran on gravel , grass , water & asphalt



i used the same hull with many different motors , started with a .46 dropped to a .30 & then a .25
the pic below is with a .46 on & flying on grass & gravel



aftr all that it stills floats & runs on the ground with a .25 on it now