Avoiding Vne

No, it is only one point.

There have been several cases of certificated gliders overstressed in
stall/spin recoveries, some of them broke up.

I saw a Ka6E being repaired after such an incident (in this case a
deliberate stall/spin for self-training, the pilot was a current
instructor), you can read about it in "Gliding Safety" by Derek Piggott, on
page 53 in my copy (second edition), under "Stall and spin-related
accidents", "Light stick forces".

You can also read about the Nimbus 4DM at Minden; 99.07.13 - LAX99MA251 -
http://www.ntsb.gov/NTSB/brief.asp?e...09X01702&key=1 Nimbus 4DM -
Minden - Two killed.

With some gliders it is both important and difficult to get the recovery
exactly right. I suspect the modern generation of gliders, Standard, 15M
and Open come into this category especially when fully ballasted and flown
in really strong conditions. The critical manoeuvre is likely to be an
inadvertent departure from a steep thermal turn in rough strong lift.
Don't let anyone tell you that it won't depart when flown like this, it may,
even if you can't get it to do it deliberately.

W.J. (Bill) Dean (U.K.).
Remove "ic" to reply.


"Stefan" wrote in message
...


W.J. (Bill) Dean (U.K.). wrote:

It is clear that some types are marginal in recovering from an
inadvertent spin entry without exceeding limits, especially if the entry
is from an accelerated stall. An ETA broke up recovering from a
deliberate stall/spin entered for certification purposes.


This is exactly the point: certificated gliders can always be recovered
from a spin without exceeding the limits, otherwise they wouldn't have
been certificated. The ETA wasn't certificated and broke up during a
test flight. It won't get certificated before this issue is fixed.

Stefan.