<p>This document is a Microsoft Word version of the of a web page on F2D.dk If you have proposals for additions or changes you are welcome to use this document for feedback. Corrections to spelling mistakes are also welcome.</p><p>To make it easier for me to track changes please follow these recommendations: </p><p>Do not delete text from the document but use strikethrough. (example) If you add text please use a colour font. (example) </p><p>You may also use the mark-up functions under “Review” (Microsoft Word)</p><p>You are welcome to fill in your name and e-mail address in the top of this document. It is my plan to send out early notifications on updates to supporters and helpers.</p><p>Name: E-mail:</p><p>Please e-mail this document with changes to: [email protected]</p><p>Thanks in advance</p><p>/Henning Forbech Back to F2D.dk</p><p>Multi blade propellers for F2D 3 and 4 blade propellers for combat First published: 1/4 2014 - Last update: 1/4 2014 - By Henning Forbech </p><p>New propellers for Combat: </p><p>How many blades should a combat propeller have. 1, 2, 3, 4 or even more? </p><p>Some interesting information can be found in this paper on propeller performance: Propeller Performance Data at Low Reynolds Numbers (4.2 Mb pdf) </p><p>A simple way to see if multi blade propeller will perform better than traditional two blade propellers it to make a test flight. </p><p>By replacing the prop nut by an extended nut it is possible to mount two propellers on an engine. To compensate for the extra weight of the second propeller the aluminum back plate can be replaced by a light weight plastic back plate . </p><p>3 blade combat propeller</p><p>A special nut will let you mount two propellers on the engine</p><p>Permalink: http://www.f2d.dk/equipment/props/multiblade.htm - Public domain - Spell checking doc </p>