Scratch and Kit Built Aircraft Discuss and share your scratch built or kit built aircraft as well as building techniques, methods, mediums and resources.

Where to put motor on plane

Old 02-22-2022, 01:04 PM
New Member
Thread Starter
Join Date: Feb 2022
Posts: 1
Default Where to put motor on plane

Hello, I would like to know if mounting the motor higher or lower would change how the plane fly?
Kaija is offline  
Old 02-22-2022, 02:43 PM
Super Contributor
solentlife's Avatar
Join Date: Oct 2010
Location: Ex UK Brit now in Latvia west coast - Ventspils
Posts: 12,905

It all depends on thrust angle ... but generally most would not notice a difference as long as motor is mounted sensibly.
solentlife is offline  
Old 02-22-2022, 07:26 PM
Super Contributor
quorneng's Avatar
Join Date: Jul 2008
Location: Cheshire, UK
Posts: 2,114

Like many such things the effect of where the motor is mounted will depend primarily on haw far it is from the ideal position.
The object is to try to place the line of the propeller thrust to pass through the point that represents where the drag of the plane acts. If it does than opening or closing the throttle will have no pitch effect of the plane.
The wing tends to create the most drag so with a high wing plane like a Cessna 172 it will tend to pitch up a little as the throttle is opened. With a low wing plane it will tend to pitch down.
Just how big the effect will be depends on how powerful the motor relative to the weight of the plane and how far the thrust line is from the centre of drag.
Within reason is possible to angle the motor slightly so the thrust line does point at the centre of drag. This is quite common in RC planes where any pitch change caused by opening or closing throttle is not immediately obvious to the pilot on the ground compared to a full size plane where the pilot is sitting in it.
I hope this helps.
Do you have a particular layout in mind?
quorneng is offline  

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service - Do Not Sell or Share My Personal Information -

Copyright © 2023 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.

Page generated in 0.09243 seconds with 11 queries