Years ago I presented Prelimina as free online tool to predict resistance of displacement boats. I forgot to post here that it also contains a...
Hello everyone, I have built a waterbike with foils and have tested it on the water, but my 16(diameter)*10(pitch) inches aircraft propeller seems...
Hi, I am new to boat design and really the science behind boating. I heard somewhere that on airplanes there is a certain RPM at which the...
What would be an ideal gear ratio for an 11 foot trimaran hull kayak using a dual 6 inch three blade counter rotating boat propeller set with a...
Hi, I would like to know how do you design a 3D propeller from 2D geometry,i.e. NACA profiles, blade sections?
hello it's my first threard in this side and I hope things will going alright so,I will begin by the keller criterion for the"CAVITATION" the K...
An impeller is a rotating part of a centrifugal pump which transfers energy from the motor that drives the pump to the fluid pumped by...
hello I am using the book of Dave Gerr to calculate a prop. But it is hard to read the diagram because i have a low Bp value (4,613). it's hard...
Good Evening. I am having problem deciding the specifications of my propeller, I have already obtained the curves for Resistance and Power vs...
Hi, I am interested in creating a database of different propellers on different applications and results. I have few magazines with some outboard...
Hey, I am looking for a propeller for our solar boat. But I don't know where to start calculating. I hope one of you can help me out.
Dear members, I have a huge doubt regarding the pitch determination in my project. I read in some materials that the pitch, by default, is...
Hello, Aboard a tall ship we want to use our generators less and charge our batteries at night by means of the wind (thus extracting power from...
Hello Everyone, I need further explanation on the dimensionning of a propeller. My method is the following : Determine total resistance >...
I am a University Student studying Naval engineering working on an electric driven high performance planing racing powerboat (8m in length). I am...
Ok, So I have had this project I have been working on for a few months (18 foot trawler style work of art) and I have run into a sort of fork in...
In terms of speed, efficiency and stability which will be better option to use as impeller: a propeller or a paddle. I will use it for a small...
Hello. I'm trying to generate 10kgf at 4kts from 300W shaft power (it is to power a smallish AUV). Max torque is *probably* about 3Nm and...
Hello, my name is João and I am a member of team Tecnico Solar boat, our goal is to create a solar powered boat. Right now I was assigned the task...
Servogear Ecoflow propulsion system, more into at www.servogear.no
