air extractor for asw19 and asw20

Hopefully he had some documentation of that, evidence of construction or sale... which could invalidate the Jonkers patent.

Ok, probably all similarities are purely coincidental then.

But regarding air extractors, I find it surprising that mainly US audience of ras does not mention Will Schuemann's work, predating JS or DG, what 35-40 years?

On Saturday, October 21, 2017 at 2:58:33 AM UTC-4, krasw wrote:
Ok, probably all similarities are purely coincidental then.

But regarding air extractors, I find it surprising that mainly US audience of ras does not mention Will Schuemann's work, predating JS or DG, what 35-40 years?

Wil was certainly a pioneer. IIRC, his 301 Libelle captured ventilation air using the leading edges of the gear doors as a scoop (the belly just ahead of the doors was flattened a bit so the doors protruded--probably not the best idea in the event of a gear up landing).

Thus pressurized, the gear box fed ventilation air into the cockpit through two outlets over the shoulders of the pilot. I don't think these could be modulated, at least initially, which was a problem when it got cold.

Air exited the glider at the base of the rudder through an expanded opening and "splitter" at the bottom of the rudder based on Wil's experiments to find the ideal low-pressure location. Jim Indrebo had a really nice version of that exit vent on his 301 in the early 80s.

Chip Bearden

On Tuesday, October 24, 2017 at 9:53:14 AM UTC-7, wrote:
On Saturday, October 21, 2017 at 2:58:33 AM UTC-4, krasw wrote:
Ok, probably all similarities are purely coincidental then.

But regarding air extractors, I find it surprising that mainly US audience of ras does not mention Will Schuemann's work, predating JS or DG, what 35-40 years?

Wil was certainly a pioneer. IIRC, his 301 Libelle captured ventilation air using the leading edges of the gear doors as a scoop (the belly just ahead of the doors was flattened a bit so the doors protruded--probably not the best idea in the event of a gear up landing).

Thus pressurized, the gear box fed ventilation air into the cockpit through two outlets over the shoulders of the pilot. I don't think these could be modulated, at least initially, which was a problem when it got cold.

Air exited the glider at the base of the rudder through an expanded opening and "splitter" at the bottom of the rudder based on Wil's experiments to find the ideal low-pressure location. Jim Indrebo had a really nice version of that exit vent on his 301 in the early 80s.

Chip Bearden

The exit vent in Dick Brandt's Nimbus 3 is at the bottom of the rudder like that. Moved a lot of air.
It was a nice mod to have in Australia.
Jim

On Tuesday, October 24, 2017 at 11:53:14 AM UTC-5, wrote:


Wil was certainly a pioneer. IIRC, his 301 Libelle captured ventilation air using the leading edges of the gear doors as a scoop (the belly just ahead of the doors was flattened a bit so the doors protruded--probably not the best idea in the event of a gear up landing).

Thus pressurized, the gear box fed ventilation air into the cockpit through two outlets over the shoulders of the pilot. I don't think these could be modulated, at least initially, which was a problem when it got cold.

Chip Bearden

A subsequent owner used Nerf balls to plug the air vents when not needed. A red one on the left, and a green one on the right. Got a heck of a scare one day when on a fast final glide, they both blew out into the cockpit at the same time!

Steve Leonard