2 blades propeller
i am about to start building my first wooden pontoon pedal boat
i know that for pedal propulsion, it is more efficient to use 2 blades propeller
i need a supplier for this type of propellers or
a drawings to make it from wood
If you can stand the larger diameter a single blade prop (with small counterweight) is even more efficent.
This was done on small aircraft 60 years ago, and works to reduce induced prop drag.
The power level you intend to operate at - 80W average person, 120 trained older person, 150W trained middle age person, 200W trained young adult, 250W athletic male, 500W olympic athlete for 5 minutes or average adult for 20 seconds.
Cadence for the nominated power. 60rpm is leisurely, 80 rpm is energetic, 90rpm is peleton, 120rpm is typically maximum power, 140rpm (with 175mm cranks) is around rev limit, can spin faster with smaller cranks, well trained athlete can spin to maybe 200rpm.
The total displacement.
The hull shape so drag versus speed can be determined.
The drive system so gear ratio is known.
Once you have all this I can design an optimum prop that you can fabricate or find something close from a model maker or small boat shop.
|Thread Tools||Search this Thread|
|Thread||Thread Starter||Forum||Replies||Last Post|
|SP propeller||babakshabani||Surface Drives||1||10-24-2007 06:56 AM|
|Conical Propeller||alexlebrit||Propulsion||4||05-22-2007 07:21 PM|
|propeller design||vpkumar||Props||3||09-25-2006 10:54 AM|
|propeller||plattgatter||Marketplace||0||06-13-2006 02:36 PM|
|Propeller for HPV||sarathes||Boat Design||6||04-19-2004 07:28 PM|