It should not come as a surprise that the JS1/JS2 cockpits are similar to the ASH26, given that they took a splash mold off of a 26 fuselage to build them. They seem identical because they are.

On Monday, October 5, 2020 at 9:22:34 AM UTC-7, wrote:
On Monday, 5 October 2020 at 15:38:53 UTC+1, Carlo Orsini wrote:
JS2 spec:
Cockpit shoulder width
525 mm

ASH31Mi spec:
Cockpit width
660 mm

Yes, there is a photo of Goudriaan in the cockpit: his position is completely lying down with shoulders under the rims. I don't think you could fly 10 hours in that position IMHO.

When talking about aerodynamic drag the fuselage frontal area is an important factor, especially at high speeds (when induced drag is less).

A pilot must take a decision: top performance or compromise & comfort ? Both is simply impossible.

(This was a factor when I had to choose between ASH31Mi and Ventus2CxM)
Those two dimensions for the JS2 and the ASH31 are clearly not be comparable - one internal cockpit rim and one external I guess. The 525mm shoulder width for the JS2 is exactly the same as the quoted figure for the JS1 (and JS3) and the JS1 cockpit roominess is fully equal to the ASH26/31 from which it was derived. I have 4 years in a JS1 followed by 2 in the ASH 26e and they are so similar that it would be hard to know which cockpit I was in with my eyes closed. Looking at the JS2 cockpit photographs it obvious that its structural cockpit rim design is the same as the 31, 26 and JS1. JS do not make small cockpits.