Small Unmanned Fixed-wing Aircraft Design by unknow

Author:unknow
Language: eng
Format: epub
ISBN: 9781119406310
Publisher: John Wiley & Sons, Inc.
Published: 2017-08-12T00:00:00+00:00

11.6 Powering and Propeller Sizing

By examining data from propeller manufacturers and their recommendations, it is possible to derive a simple regression curve that allows probable propeller diameter to be derived from engine capacity and likely pitch from diameter:

Also, one can estimate the likely engine capacity from engine power by looking at a range of small engines to get

.

Then the (uncorrected) Abbott equations3 link power, thrust, pitch, diameter, and rotational speed as:

.

Therefore, we can eliminate rpm to link thrust to power:

.

So, given an engine power, we can estimate its likely static thrust when matched to a suitable propeller. Since we can also estimate the required thrust for cruise, banked turns, climb, and takeoff as described in the previous chapter, it is then possible to make an engine selection given the overall aircraft weight. For example, the estimated thrust needed for takeoff is given by

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