Some gliders safer than others?

On Thursday, October 24, 2013 10:13:10 AM UTC-4, Papa3 wrote:
I'm sure the "conventional wisdom" gives the nod to Schleicher.

Say what ? The modern Schleicher cockpits are huge
improvements over earlier designs, however:
- no crush zone in front of your feet to absorb energy and
decelerate the glider before your feet do
- a giant hole is cut in the side beam for air ventilation
output, reducing the buckling strength needed here

Again, please look at:

http://www.lange-aviation.com/htm/en...0e/safety.html

Hope that helps,
Best Regards, Dave "YO electric"

PS: Some of you will remember I donated a fuselage for crash
testing some decades back, hoping to help improve cockpit safety...

On Thursday, October 24, 2013 5:52:38 PM UTC-4, Dave Nadler wrote:
On Thursday, October 24, 2013 10:13:10 AM UTC-4, Papa3 wrote: I'm sure the "conventional wisdom" gives the nod to Schleicher. Say what ? The modern Schleicher cockpits are huge improvements over earlier designs, however: - no crush zone in front of your feet to absorb energy and decelerate the glider before your feet do - a giant hole is cut in the side beam for air ventilation output, reducing the buckling strength needed here Again, please look at: http://www.lange-aviation.com/htm/en...0e/safety.html Hope that helps, Best Regards, Dave "YO electric" PS: Some of you will remember I donated a fuselage for crash testing some decades back, hoping to help improve cockpit safety...

A review of the lamination schemes for '24, 27, 28 reflects a designed in forward crush area in the nose with progressively stiffer structure once in the pilot protection zone. I have observed closely both a '24 and a'27 that had significant nose damage and niether had any failure in the area where the air vent is located. Waibel pioneered that aspect that others have wisely emulated.
UH

Dave Nadler wrote, On 10/24/2013 2:52 PM:
On Thursday, October 24, 2013 10:13:10 AM UTC-4, Papa3 wrote:
I'm sure the "conventional wisdom" gives the nod to Schleicher.

Say what ? The modern Schleicher cockpits are huge
improvements over earlier designs, however:
- no crush zone in front of your feet to absorb energy and
decelerate the glider before your feet do
- a giant hole is cut in the side beam for air ventilation
output, reducing the buckling strength needed here

The air vent is not in structural ducting. All the buckling strength
needed is in the cockpit rails, which are clearly seen when the canopy
is open. They are straight to improve buckling resistance, and very
strong. Take a look at ASW-24, 26, and all later ones. I don't know
about the ASH-25, as I haven't looked at one closely enough.

--
Eric Greenwell - Washington State, USA (change ".netto" to ".us" to
email me)