Ben, the LS6A was always a favorite glider of mine, had one for 12 years. But after flying ASW27 the LS6 felt claustrophobic. A mod to the seat back somewhat fixed that. The JS1 is not quite as large a cockpit as the ASH26, even though from the outside the fuselages appear the same. But both JS1 and ASW27/28/29 fuselage should feel spacious after flying the 6. The LS6C seat back apparently stolen from LS8 makes that cockpit feel larger too.
If your shoes are wide, ASW27/28/29 rudder pedals may require you to narrow the soles of your shoes (I use a die grinder) to fit between the cable guides and the tabs on the inside of the pedals. I don't remember doing this in the 26 or JS1, but that may have been choice of footwear at the time.
With the 29 I fly middle seatback position at the bottom, I have raised the adjustment cross-tube 1 hole on 27 and 29 so the seat tilts further back. It's necessary to grind a bit out of the right side flange of the seat back to accommodate the Oxygen regulator if you do this. My pedals are not in full forward position. I'm 6'0" (1.83m) tall and about 173Lbs (78.5kg). As they say, your mileage may vary.
The JS1 seat back is not adjustable in flight. Nor are some of the 29s I've seen.
Regarding Oxygen, the JS1 uses a smaller O2 cylinder than anything else I've run into. There's a mod to put a second cylinder in the fuselage, but that will not work if you have the jet sustainer.
Forgot to mention in the previous post, the JS1 has a couple of W+B related items that are notable.
There is a second 5 liter tail tank which cannot be dumped in flight, so you can adjust the CG to your preference and it won't change when you dump the water ballast you've correctly loaded using the fantastic spreadsheet Jonker Sailplanes provides. This is particularly useful for a partnership or syndicate.
Jim


On Wednesday, January 28, 2015 at 5:59:28 PM UTC-8, Ben Coleman wrote:
On Thursday, 29 January 2015 09:01:42 UTC+10, JS wrote:
Comments from 40 hours or so in JS1B and C, more in the 29, and even more in a 26E:


Jim, how do cockpit sizes compare bewteen the 26E, 29 and JS1? I am a wide body model and just about have to lube up to get in my LS6 - if I'm dreaming of a new ship I may as well dream about one that fits.

Thanks Ben