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Old Jan 26, 2004, 04:57 AM
Graham Stabler is offline
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Oxford/England
Joined May 2001
4,017 Posts
Data & Measurement

Motor Constants for Micro Motors. Max efficiency and max power rpm obtained using Jochen Bergmeyer's technique for determining motor constants. Covers N20 sized motors and below.

DC5-2.4 and Firefly Coreless Motors

7mm Pager Motors from Super Slicks RC cars.

Blade Runner N20 motor tests. The Blade runner N20 is a high cogging motor with lower resistance than a standard N20-LV and stronger magnets.

Thrust Stands for Micro Motors

135mAh Lithium Polymer Cell Tests

Bruce Abbott's GWS Prop Thrust Calculator
Originally posted in this post
Bruce wrote:
Quote:
Included in the attached zip archive is an Excel spreadsheet with all my measurements for GWS props, and a thrust calculator. To calculate thrust at another rpm, enter your rpm along with the prop's diameter, pitch, and tconst from the measurements section.

If you have a prop that is not listed, you can try guessing its tconst by comparing to a similar prop that I have tested. In general, slowfly props have higher tconst than hyperdrive, and a higher pitch/diameter ratio also increases pconst (up to a point, then it decreases as the prop stalls).

Note that my tconst is NOT the same as Motocalc's tconst (which is calculated from power, not rpm!).
Download the zipped spreadsheet file below and use.
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Last edited by Gordon Johnson; Sep 23, 2005 at 07:47 AM.
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