The very long wing open class gliders have a bad record on spin recovery.
They will generally transition to a spiral dive quite early in a spin,
but will accelerate very rapidly on the exit.
If they do get into a stable spin, the momentum in the wings is a problem.

If you have water in the wings, or fuel, then you are a test pilot.
Certification is done dry.

There are at least five Nimbus 4D accidents I am aware of where recovery
was past Vne and the glider broke up on recovery. Ash25 - same story.

Bruce

On 2016-02-02 08:12, Paul B wrote:

As the N4DM is certified, it had to be demonstrated that it will exit a spin after 3 turn at most.
Loosing 1800 m in any certified glider while trying to stop the spin is hilarious.

Maybe not if you in it. But I do see your point, was a spiral mistaken for a spin?

Cheers

Paul


This corresponds to something like 12-15 turns. Something has gone wrong very seriously.

Bert
Ventus cM TW


--
Bruce Greeff
T59D #1771