On Tuesday, June 28, 2016 at 2:54:01 PM UTC-5, wrote:

It's not so much a question of empty weight, but where the CG is located, So weighing the glider in a trailer is useless.

Ah, but if you know the total weight of the glider, you can then use a calibrated (or verified) bathroom type scale under the wheel that has the low weight on it, and from that determine the weight on the "heavy" wheel, measure moment arms (or trust factory measurements) and calculate C of G location.

So, I respectfully disagree with your conclusion that weighing the glider in the trailer is "useless". It is just the first step to determining empty weight and C of G.

You could also weigh each part separately, sum them to get total weight, then get the weight on the light wheel with the plane assembled and properly leveled, and calculate C of G location.

But, I agree it is far easier to get an appropriate set of scales, and weigh the assembled airplane!

Steve Leonard