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Old 06-02-2014, 07:40 PM   #1
mclarkson
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Default Building a test stand to measure thrust

I'm starting a new build and have two potential motors available, but am not sure which one to use.

I'm using this as an excuse to build a test stand to measure their respective thrust with various props. This was inspired by a Flite Test video I remembered watching some time ago.

It's form is an Isosceles triangle. The idea is that thrust is applied by the motor at the top left corner (B), and is transferred to a digital scale which sits under the bottom right corner (C). The frame is hinged at the remaining corner (A), directly beneath the motor, allowing the frame to rotate and apply pressure to the scale. The horizontal arm (AC) and the vertical arm (AB) are the exact same length.


Here’s the finished frame, made from basswood, balsa, a Popsicle stick and some bamboo skewers. The long arms are 18" each; I cut a single piece of 1/2"x1/2"x36" balsa in half at a 45 degree angle and glued it back together to form the right angle of the frame.


The thrust is directed onto the scale via this short length of bamboo skewer.


The third corner is attached to the frame’s “foot” via a small hinge. The 'foot' plus hinge have approximately the same height as the digital scale.



The motor(s) mount to a stick mount at the top corner of the frame. The ESC and other components are held in place with zip ties.


Here’s the full setup. 1-Motor; 2-Peg for motor mount; 3-ESC; 4-LiPo; 5-Watt meter; 6-Digital Scale; 7-Rx.

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