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An Introduction

to

Radio Control Electric Flight

by

Phil Langton

 

 

 

Information and Guidelines

for entering the exciting world of

 
 

Electric Powered R/C Flying

 

This document is broken into 5 parts

Part 1 - Introduction
Part 2 - Understanding power requirements & motors
Part 3 - Understanding batteries
Part 4 - Construction considerations
Part 5 - Conclusions

 

Part 4

5. Wing Loading:

Much can be written about this subject and not many are qualified to do so, self included. But as a guide, for a forty IC size model around 22 oz per square foot of wing area is a start.  My models are usually higher than this because I am always searching for aerobatic performance. Many of my models land really fast as a result.
The following table may be of use:-

Small models (Under 36 inch span) 2 to 15 oz/sq foot.
Medium size  (36 – 48 inch span) 15 – 19 oz/sq foot.
Large size (48– 54 inch span) 19 -26oz/sq foot.

 

6.    Build Light, not for Crashes:

The excellent power to weight ratio of our modern IC engines has allowed us to ignore the weight “cost” of adding more stiffening/weight etc than necessary in the attempt to crash proof our models. In a lot of situations this is a fallacy. All we achieve is greater wing loading and higher landing speeds and stalling point.

With electric flight much lighter structures are satisfactory because there is less vibration produced by the rotating mass, the motor.

As a rule of thumb, we like to aim at the air frame weight being no more than 50 % of the flying weight of the aircraft. This means the electric motor, speed controller, radio gear and servos would also be 50% of total flying weight. This R of T does not recognize wing area, or type of plane or desired flight characteristics. So don’t take it as gospel.

 

 

Disclaimer:  To the reader... please feel free to download, use and copy this Treatise on the understanding that it is for 'private' use only and must not be used in any way for commercial purposes without the writers permission. 
 
Note also, that the information is a work in process and may be amended at any time should the writer or the Club decide so to do. No responsibility or liability is expressed or implied with respect to the information contained in the Introduction to Electric Flight material.

A copy of this article is also available in pdf format below.

Files:
Name Created Size Downloads    
O.S. Engines 2008 Flyer 2008-10-18 104.47 KB 301 Download

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