Hello everyone, we are new to boating and the forum allthough i have been reading posts and getting great info for a while now. We have a 17 foit open bow with a 3.0 IO and tryed tubing for the first time a couple of days ago have a 3 person flat style tube with short back rests the only place to hook onto is ski hook, i was nominated as the tester as my wife operated the boat so i climb on in thinking this should be easy well i dont know what we did wrong but the tube kept diving i am not a heavy guy and was sitting in the middle seat of tube which is a little forward of other seats, thinking we needed more weight i put our 4 year old on my lap leant back as much as i could and went slow. Well that didnt work the nose just dove in and the screams started, and with frustration starting we just pacoed it in until we can figure out what we did wrong. So if anyone can give us some pointers or maybe the style of a tube that is less prone to submarining that would be great, thank you all.