On Tuesday, May 5, 2020 at 4:57:52 AM UTC-7, Richard Pfiffner wrote:
On Monday, May 4, 2020 at 10:41:50 PM UTC-7, 2G wrote:
On Monday, May 4, 2020 at 1:16:42 PM UTC-7, wrote:
On Sunday, May 3, 2020 at 12:59:41 PM UTC-4, wrote:
Hello All,

Las Vegas Valley Soaring is currently restoring our beloved SGS 1-26D and will need to establish a new empty weight CG once finished. Does anyone know where I might source a borrowed or rented set of scales?


Thanks!
Dennis Ballew
Vice President
Las Vegas Valley Soaring.

Schweizer documentation indicated that, if no big scale is available, use 2 bathroom scales with a board across them.
FWIW
UH

Electronic scales that measure up to 300 kg are available for under $100. I calibrated a pair of bathroom scales by going to an immediate care clinic with a backpack loaded with about 50 lbs of weights. I asked to use their patient platform scale, which they gladly agreed to. I weighed myself with and without the backpack. I then weighed myself the same way on both bathroom scales (they were surprisingly accurate). The most critical measurement is the tail weight as it has the longest moment arm. I would check the scale this way as close as possible to the expected tail weight.

One thing to keep in mind is that any breeze will upset this measurement. Either find a hangar you can do this in, or go out early and do it on a calm day.

Tom

Buy 3 of these for $34.99 ea free Prime shipping. Make a ramp to use 2 on the main wheel and one for the tail. 440 lbs capacity ea.

https://www.amazon.com/Smart-Weigh-S...xpY2s9dHJ1ZQ==

Richard

Be careful. Here is one review:

this scale sucks! it is not accurate and got 5 out of 6 box weights wrong when I took them to the UPS they were all a few pounds over what the scale had told me. one of them was wrong by 8 pounds.

Using a scale so far off to do a W&B can lead to very significant errors if used to weigh the tail. A 1 lb error in measuring the tail weight of an ASH26e, for example, will result in a 3.3% error in the CG. An 8 lb error results in 26% error, which can be deadly.

Tom