There was a post I came across awhile back that covered the same theory as the Uniflow link you posted. http://www.rcuniverse.com/forum/m_74...tm.htm#7430203

The only real drawback to setting it up this way (granted, the link I posted doesnt use a hopper tank as its in a r/c car and not a plane or boat) is because fuel flow stays consistent, you dont get much warning when you're almost out of fuel like you do with traditional fuel systems.

The problem I have with using bladder tanks is they cost 3-5 times as much as a standard tank plus shipping as none of my LHS's carry bladder tanks AND won't give me any different results than a standard tank will. Since the boat is going to ride almost dead level and not be running sideways or upside down, I see no added benefit to spending $20-40 on 2 fuel tanks that a set of $4-$6 tanks will do.

When I revived this thread, I went at it with the intent to get information from folks that have actually used the setup I outlined based on advice from Darryl. (I wasn't real clear on that when I started, so I apologize for that.) Being that I'm not real familiar with aircraft engines just yet, I'm trying to get the best advice/information as I can so I don't have to rip the hull apart if something doesnt work. Real-world experience trumps speculation any day of the week. Keep in mind, I don't say this to step on anyone's toes as any input people have on the subject I will take, learn from, and hopefully use (with success). I already have about 2 months and many many many hours or build time in on this project and I want to set it up right the first time.

Here is Darryl's website in case you'd like to read up on him and his experience. He was a very nice gentleman and was very concise with his advice. http://www.darrolcady.com/index.htm