I wonder (but haven't done the math) how much accuracy is really required. If each of the scales is accurate to say within three pounds, and in the unlikely event that all the errors are in the same direction, is a nine pound error tolerable? (I don't know the specs for "certified" aircraft scales.) Also, at one point, factory built airplanes were not all weighed when they were built, but only every tenth airplane or so... Gross weight is important, but keeping the c.g. from going too far aft is really important...
The percent error is only at max weight, unless otherwise indicated. So a 600lb scale with a 1% error means an error of 6lbs, across the entire range. Using these scales to weigh a 10lb object can still give the 6lb error. That is why you must be careful to use scales of appropriate capacity.I believe the ones I used on the military were 0.1% of the reading. So a 500 lb weight would be 0.5 lbs. A 30,000 lb wheel would be 30 lbs.
Isn't 6lbs = 1.0% of 600lbs ???
I fixed it.Isn't 6lbs = 1.0% of 600lbs ???
ESPECIALLY for us electronic engineers!!!Those darn decimal points
The percent error is only at max weight, unless otherwise indicated. So a 600lb scale with a 1% error means an error of 6lbs, across the entire range. Using these scales to weigh a 10lb object can still give the 6lb error. That is why you must be careful to use scales of appropriate capacity.
FWIW a "rule of thumb" is to weigh no less than about 60% of max scale capability. So for accuracy, a 600lb scales should not be used to weigh anything less than about 360lbs. In my case the main tires were 532/544lbs while the nose tire was 363lbs.
Three of these might do for most 2 seaters?
https://www.amazon.com/Weigh-Xl-700-Talking-Bathroom-Scale/dp/B096CJB5CY
Take care that the bathroom scale style sometimes has a "tap to wake" and an automatic timeout that will kick in at the most inopportune time... Like just after you've got the plane all positioned on it and before you've crawled underneath to read the numbers. And with the weight on it, you can't "tap" to wake them up.
Take care that the bathroom scale style sometimes has a "tap to wake" and an automatic timeout that will kick in at the most inopportune time... Like just after you've got the plane all positioned on it and before you've crawled underneath to read the numbers. And with the weight on it, you can't "tap" to wake them up.
Joe Ruggless sold his scales for race cars years ago. Certainly someone still has a set lying around that they’d sell cheap. Here’s an old link but some checking around should reveal more. https://grassrootsmotorsports.com/forum/parts-sale/ruggles-scales-fs/179236/page1/
Consider renting the scales from your local industrial supply store if you want to save the $ and not have equipment that rarely gets used lying around the hangar.
Erich