On 29 Jul, 04:47, "BlueCumulus" wrote:

4. The phase of preparation for production (manufacturing of mould,
jigs etc) has been accomplished with care and in practice it is impossible
to produce 2 sailplanes different in significant way one from another.

I wonder why not both sailplanes, the SP-3697 and the VH-VHZ look the same?

Because one is a pre-production prototype and the other is from the
production series?

Ian