1. Your boat should either have a narrow bow such as a canoe or kayak, or flat bottom boat that where the bottom curves up at the bow, think a barge or a Boston Whaler ( http://en. wikipedia. org/wiki/Boston_Whaler ) or an airboat ( http://en. wikipedia. org/wiki/Airboat ). Either of these types of design will do a good job with drag. Although I might try to mimic the air boat. It would be easier to build.
2. You need a fin on the bottom to keep it going straight. You could even have two fins, one on each side.
3. I’d also put a nozzel on the balloon outlet to make it a bit more efficient. See http://en. wikipedia. org/wiki/Rocket_engine . A little cone would make it much more efficient.
1. Your boat should either have a narrow bow such as a canoe or kayak, or flat bottom boat that where the bottom curves up at the bow, think a barge or a Boston Whaler ( http://en. wikipedia. org/wiki/Boston_Whaler ) or an airboat ( http://en. wikipedia. org/wiki/Airboat ). Either of these types of design will do a good job with drag. Although I might try to mimic the air boat. It would be easier to build.
2. You need a fin on the bottom to keep it going straight. You could even have two fins, one on each side.
3. I’d also put a nozzel on the balloon outlet to make it a bit more efficient. See http://en. wikipedia. org/wiki/Rocket_engine . A little cone would make it much more efficient.