This is a full service web site.
This should tell you what you need to know about the ammo swap. The guy with the van-halen boat had run it with 4S lipos and says it's not controlable at WOT. H has a full throttle launch and it blows over after about 20 feet. Pretty impressive. I think if you mind it it would be fun but be ready to retrieve it.
http://www.rcuniverse.com/forum/m_49...tm.htm#4946770