# propulsion

1. Thread

### Preliminary Design Propulsion Efficiency

Hello everyone, I am struggling with one question considering small power boat design (up to 24m, planing hull) in concept and preliminary stage....
Thread by: ToMeK, Apr 27, 2024, 3 replies, in forum: Props
2. Thread

### how to find the angle of entrance

Hello there, As I'm working on Holtrop resistance prediction method, I would like to know how to find the Angle of entrance value. I have used the...
Thread by: jake wilson, Aug 24, 2021, 1 replies, in forum: Props
3. Thread

### Sailing yacht - Estimating ballast bulb added resistance?

Dear all, I am trying to estimate the resistance added from a bulb on a sailing yacht in upright resistance. I have bare hull resistance...
Thread by: Claudio Valerio Parboni, Apr 28, 2021, 3 replies, in forum: Hydrodynamics and Aerodynamics
4. Thread

### Gear ratio for pedal drive

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...
Thread by: Astrocat505, Feb 18, 2021, 11 replies, in forum: Props
5. Thread

### 3D Propeller Design

Hi, I would like to know how do you design a 3D propeller from 2D geometry,i.e. NACA profiles, blade sections?
Thread by: marufuddin0, Dec 13, 2020, 7 replies, in forum: Propulsion
6. Thread

### Wave force induced power proa magnetic propulsion

Kind regards, happy boaters! I want to start a topic on wave force induced propulsion. Brief intro: I have been reading and enjoying this...
Thread by: AAn, Sep 3, 2020, 7 replies, in forum: Propulsion
7. Thread

### Design Tug Boat propulsion system

Hello everyone! I want to design a propulsion system for a tugboat with maximum performance on bollard pull using a ducted propeller (Kaplan)....
Thread by: Luizsbk, Jun 21, 2020, 2 replies, in forum: Props
8. Thread

### Help with Kort No. 19A/37 Ordinates

Dear, I would like to know if any member of the forum could assist me (or guide, at least). I am looking for the points/coordinates of Kort No....
Thread by: Samuel Neves Jocas, Mar 20, 2020, 1 replies, in forum: Props
9. Thread

### Article on Waterjet propulsion

Not sure about the right place You can find a good information article here on waterjet propulsion . Learn about Waterjet Propulsion System - A...
Thread by: Dr34m3r, Mar 7, 2019, 0 replies, in forum: Propulsion
10. Thread

### Propulsion removing solutions?

Hi. Sooo its about 4 meters long catamaran boat with small electric motor propulsion. Hull (see attached picture below) is with aft tunnel to...
Thread by: Lietuvis, Oct 7, 2018, 8 replies, in forum: Boat Design
11. Thread

### Van Oortmerssen Resistance Prediction Method

Hi, I am looking for a method to calculate resistance of a 40m vessel using the Van Oortmerssen (1971) procedure. Can anyone help with providing...
Thread by: SophieF21, Mar 28, 2018, 2 replies, in forum: Boat Design
12. Thread

### SAR Boat Not Achieving Speed

I have a 28' Hike Metal SAR boat with twin Volvo TAMD31's running Hamilton 211 jets through 1:1 Velvet Drive transmissions. The boat has an...
Thread by: hilinr, Mar 12, 2018, 8 replies, in forum: Jet Drives
13. Thread

### More than two outboards for sailing catamaran?

I'm planning a sailing (decent-performance cruising, not racing) catamaran, S/V Hypothetical. Construction is reinforced plastic, cored above...
Thread by: Markusik, Mar 1, 2018, 18 replies, in forum: Multihulls
14. Thread

### Propulsion position - sailing yacht

Dear everyone, I started working on sailing yacht concept, my first project. For the purpose of making the GA I need to decide about Propeller...
Thread by: ToMeK, Feb 28, 2018, 2 replies, in forum: Sailboats
15. Thread

### Wind or wave propulsion of raft with irregural hull shape

I keep landing on these forums when I'm looking up things, so I thought I might as well make a thread of my own and maybe some of you geniuses...
Thread by: Katti, Feb 19, 2018, 5 replies, in forum: Boat Design