another crash

The DG/LS folks are really pushing the Roeger hook to prevent a DG canopy from smacking you in the back of the head by forcing the canopy to rotate at the rear and then up and out of the way.

Rear more he
https://www.dg-flugzeugbau.de/en/lib...he-roeger-hook

Not having read the report, I wonder:Â* As the canopy rotates upward and
aft about the Roeger hook, given the position of the headrest, does it
rotate forward and upward hitting the pilot in the back of the head?Â* It
would be interesting to simulate this on the ground with a few people
and a bunch of hands to insure no damage.

On 9/4/2019 4:37 AM, John DeRosa OHM Ω http://aviation.derosaweb.net wrote:
The DG/LS folks are really pushing the Roeger hook to prevent a DG canopy from smacking you in the back of the head by forcing the canopy to rotate at the rear and then up and out of the way.

Rear more he
https://www.dg-flugzeugbau.de/en/lib...he-roeger-hook

--
Dan, 5J

On the photos I could find on google, all the later DG singles have a seat back mounted headrest, at least the 300/600/800 I found.
100/200/400 are the only ones I can find with canopy mount. It appears DG themselves changed it.
It’s only common sense to see no good is going to come from the headrest in a canopy ejection scenario.
I do want to have a headrest I’m going to contact DG about fitting a later model seat back, might as well get something for the blackmail contract.
When I talked to my CFI just a couple of months ago he was quite insistent that having no headrest was better from a lookout point of view.

I'm not sure about the rest but all 300 and 303's has the headrest mounted on the back of the canopy rail...that also includes my 300.

Examples of none canopy headrest.
DG 300. https://www.sfg-wershofen.de/verein/...0-club-d-4578/
Dg800 https://abpic.co.uk/pictures/model/G...irks%20DG-800S
It appears early model 300 had the canopy mounted head bashed.

BTW
At least in my glider but I'm sure in just about any; in regards to the headrest blocking vision there is is no frigging way I could even twist my head to see it let alone it blocking my sight.
This unless one has a neck of a giraffe:-)

On 9/6/2019 10:16 AM, 6PK wrote:
BTW At least in my glider but I'm sure in just about any; in regards to the
headrest blocking vision there is is no frigging way I could even twist my
head to see it let alone it blocking my sight. This unless one has a neck
of a giraffe:-)

There's always one in the crowd!

Believe it or not, giraffes can turn their heads no farther than humans, since
both species have the same (7) number of neck vertebrae (or so I seem to
remember reading somewhere, somewhen).

Birds, on the other hand, are reputed to have 13 neck vertebrae, which is
allegedly why (say) owls can turn their heads 180-degrees, whereas we poor
humans and giraffes are limited to 90-degrees. Combine 180-degree range of
motion with birds/owls' quick reflexes, and thus the old wives' tale that you
can kill an owl watching you simply by walking around and around it until it
twists it head off.

Kinda makes you wonder how's come the stories of gliders being able to "sneak
up" on soaring birds in flight! There might BE something to this situational
awareness theory!

We now return to your regularly scheduled programming. You're welcome!

Bob W.

---
This email has been checked for viruses by AVG.
https://www.avg.com

On Fri, 06 Sep 2019 20:32:19 -0600, BobW wrote:

Kinda makes you wonder how's come the stories of gliders being able to
"sneak up" on soaring birds in flight! There might BE something to this
situational awareness theory!

I put that down to birds that regularly soar in flocks (gulls, kites,
vultures) having good, and quite obvious, traffic awareness while
solitary raptors don't. When I've had gulls join my thermal they've
always turned the same way as me but three times now I've had a smallish
hawk (kestrel or similar) come round the thermal the wrong way, suddenly
spot my glider about the same time I saw them, close wings and plummet.


--
Martin | martin at
Gregorie | gregorie dot org

Charlie Quebec wrote on 9/6/2019 12:58 AM:
When I talked to my CFI just a couple of months ago he was quite insistent that having no headrest was better from a lookout point of view.

That's not true for the ASW20C I used to fly, nor the ASH26E I currently fly. Did
he mention any specifics? For example, was he thinking of pilots that adjust the
headrest so it is touching their heads during normal flight? That might interfere
with looking upwards.

--
Eric Greenwell - Washington State, USA (change ".netto" to ".us" to email me)
- "A Guide to Self-Launching Sailplane Operation"
https://sites.google.com/site/motorg...ad-the-guide-1
- "Transponders in Sailplanes - Dec 2014a" also ADS-B, PCAS, Flarm

http://soaringsafety.org/prevention/...anes-2014A.pdf

He felt that headrests limit lookout, and with 37,000 hours gliding and a world champion, seems uniquely qualified.