John! J certainly no one is saying your stupid here… My questions were so I could get a grasp of where you are at etc… Im sure most of the psubbers have been called all sorts of names when they tell people they are building a sub J Not everyone is old here…. Im 30 years old.. On the subject of electric motors for propulsion… There are lots of electric vehicle motors around now days… Brushless.. ranging in size from 5KW thought to hundreds and thousands of kilowatt’s… I actually added a few Electric vehicle products to my website just the other night! Along with Torque/Power/Voltage Curves and other technical data.. Kostov Dual R20 MotorNetGain TransWarp 11 w/Slip yoke & housingFB1-4001 DC MotorAnd the motors can be joined together in series to double the power output! J That last motor has these specs… At 72 Volts Continuous rating: 12.8 kw (17.0 hp) At 96 Volts Continuous rating: 15.0 kw (20.0 hp) At 120 Volts Continuous rating: 19.0 kw (25.2 hp) At 144 Volts Continuous rating: 21.5 kw (28.5 hp) Also if you go back through the mailing list archive on the website, there was discussion about oil compensation of motors just a month or two ago! J Fill the motor with an oil of some type and then there is no pressure difference between inside and outside (as long as you get ALL the air out of the motor) fluid’s don’t compress.. The X Style tail sounds nice… but its going to require additional control mechanism’s… keep it simple! J From: owner-personal_submersibles@psubs.org [mailto:owner-personal_submersibles@psubs.org] On Behalf Of Firebolt Ok, since the whole galaxy (lie) insists on knowing my plans I will say them and only once. I am a student, my age is of no importance as long as one day I build a Submarine (to me that is, I am not a kid). I have friends that will help and so I have a team. Right now the sub is only in design stage and will be like that until I have the money and the support. I am trying to make the boat simple as possible so I have taken out some features I had said on my last posts. The sub will be for exploration, researching and wreck diving. I will try to keep inside a budget of 200000 USD. I am studying electrical engineering and computer science and some physics. I still have some problems like "How to design the stern section of the sub" "How to install a shaft and propeller (and not let lots of water in)" "Control dive plane or move them" And Other problems. The reason why I am doing this now is because I want to get a head start and not waist a lot of time or at least have an idea of what to do. This is about the only place where I can receive help. I ask my instructors about pressure hulls and I end up telling them it’s a sub and they look at me like I'm a crazy man. I have searched half the internet of electric motors that can give me speeds of 8 knots and I find little kids toys(exaggeration). I assure everyone I will research a lot lot lot more, even though some of these concepts are somewhat confusing (abs hull sheet). I will say that I am determined to do this, if I ever do build the sub and your ages are not 100 I would very much like to meet everyone in a Psub meeting. I am not mad it just my way of saying things, just don’t comment on my stupidity. Current sub dimensions: length 56 ft, diameter 7 ft height 15 ft wall thickness 1/2 inch and 42 ft cylinder part. I may change the total length to 50 ft I don’t know how much space the stern section needs yet. I am planning on having x type rudders and dive planes also 5 blades for a prop. Thank you very much. John |