The F-35’s Martin-Baker Ejection Seat

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popcorn

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Unread post05 Oct 2015, 02:39

SpudmanWP wrote:Only put in the counter weight for pilots that need it.

You should easily be able to design one that mounts with two tabs & two clamps.

In & out in less than one minute.

Yeah, that seems an option. Or put skinny pilots on a weight-gaining diet. :D
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Unread post05 Oct 2015, 02:40

Fill their pockets with lead shot bags.

Just don't eject over water :)
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Unread post05 Oct 2015, 02:47

popcorn wrote:
SpudmanWP wrote:Only put in the counter weight for pilots that need it.

You should easily be able to design one that mounts with two tabs & two clamps.

In & out in less than one minute.

Yeah, that seems an option. Or put skinny pilots on a weight-gaining diet. :D


Gallon of milk a day.GOMAD does wonders
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Unread post05 Oct 2015, 17:33

SpudmanWP wrote:On the women as pilots issue, the one pilot that has been temporary kept from flying is a man.
.


My high school weight lifting coach would have a serious debate about any male weighing less than 136 pounds being a "Man" but that a matter of definition --Hiyoo!!
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Unread post05 Oct 2015, 19:07

:mrgreen: :roll: "...GOMAD does wonders." Is that because of 'mad cow disease'? <sigh> :doh:
RAN FAA A4G Skyhawk 1970s: https://www.faaaa.asn.au/spazsinbad-a4g/ AND https://www.youtube.com/channel/UCwqC_s6gcCVvG7NOge3qfAQ/
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Unread post05 Oct 2015, 20:56

Well this is dumb question.

Is the issue the seat or the helmet? This is the same seat in the T-38 upgrade and T-6 trainers. These do not have this limit, I do not believe they use the heavier helmets with HMDs integrated.
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Unread post05 Oct 2015, 21:39

h-bomb wrote:Well this is dumb question.

Is the issue the seat or the helmet? This is the same seat in the T-38 upgrade and T-6 trainers. These do not have this limit, I do not believe they use the heavier helmets with HMDs integrated.


Easy question actually. The issue is the weight on the head due to the helmet.
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Unread post05 Oct 2015, 22:09

So. Because two reports say this on page one of this thread 'it is the helmet'? For Fsake Puhleez.
"...This is an ejection seat issue and is not related to the differences between the Gen II and Gen III helmets....

"...The ejection seat issue is not related to the new Generation 3 helmet, built by Rockwell Collins and delivered to the JPO in August, DellaVedova said.

In August, testers discovered that when a lighter pilot is flying the aircraft, the ejection seat slightly over-rotates, Col. Todd Canterbury, who was commander of the 33rd Fighter Wing until June, told Defense News on Wednesday. The team is concerned that when the parachute opens, a lightweight pilot may not be in the optimal body position to eject out of the plane, he said.

“It’s that light pilot and the center of gravity of the seat,” said Canterbury, who flew F-35 software versions 1B, 2A, 3i and 2B. “It all has to do with getting that center of gravity kind of located within the window, we call it, for safe seat-man separation.”

Canterbury stressed that the weight restriction is an interim fix, and the JPO is working closely with aircraft builder Lockheed Martin and Martin-Baker on a permanent solution...."
RAN FAA A4G Skyhawk 1970s: https://www.faaaa.asn.au/spazsinbad-a4g/ AND https://www.youtube.com/channel/UCwqC_s6gcCVvG7NOge3qfAQ/
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Unread post05 Oct 2015, 22:36

SpudmanWP wrote:Only put in the counter weight for pilots that need it.

You should easily be able to design one that mounts with two tabs & two clamps.

In & out in less than one minute.


Because a modern combat aircraft cockpit is so roomy and uncluttered?
Ejection seats are kinda like the back seat of your 72 Nova that you can just adjust with a screw gun and hole saw?
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Unread post05 Oct 2015, 22:57

Two bars (one for each side of the seat) of lead 2"x2"x5" = 20 lbs

There is plenty of space for something that small on the sides or even back of the seat.

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Last edited by SpudmanWP on 05 Oct 2015, 23:07, edited 1 time in total.
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Unread post05 Oct 2015, 23:07

:devil: Tomassetti is a shortarse for sure. :mrgreen: However as the quotes above state it is the center of gravity of the seat/light pilot that is the issue. Probably the problem is easily solvable with extra testing/effort. Dunno. However putting extra weights at convenient for now places on the ejection seat may not be feasible - but I do not claim to know.

As some have pointed out - aircrew size/weight restrictions have been with us for some time. Yes the MB F-35 seat was designed to certain limits which have been modified for the moment. I recall seeing something some time back about the new HMDS and airspeed on ejection issues that have been solved. It will work out in the end. :mrgreen:

Old Sea Venom Martin-Baker Four seats would take off pilot toes in certain circumstances so they wore steel capped boots made of suede, which then had to have a side zipper (as well as laces) for quick removal in water or where ever. Maybe some deep sea diving LEAD BOOTS will fix the F-35 midget seat problem? :devil:

WOW 'SWP' that last video for the F-35 MB seat is excellent.
RAN FAA A4G Skyhawk 1970s: https://www.faaaa.asn.au/spazsinbad-a4g/ AND https://www.youtube.com/channel/UCwqC_s6gcCVvG7NOge3qfAQ/
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Unread post05 Oct 2015, 23:15

spazsinbad wrote: :devil: . Maybe some deep sea diving LEAD BOOTS will fix the F-35 midget seat problem? :devil:


I wouldn't love to see the water ejection training videos with pilots wearing lead boots trying to recover in the pool.
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Unread post05 Oct 2015, 23:23

:devil: They have emergency oxygen to breathe until they don't - then problem solved - no? :doh: Watching that last video posted by 'SWP' above I was amazed at the realife speed violence of the seat tumbling along with pilot parachute (depending on circumstances of the ejection as seen in the video). Some A4G pilots ejected almost zero/zero with comments about the violence of their experience. It ain't for the faint hearted and then have to get untangled in the water immediately afterwards. One of our pilots was almost dragged underwater by the tail of the sinking aircraft getting tangled up with the parachute rigging temporarily. Sometimes luck is all one has along with good training and quick reflexes and all the other good stuff - a good zero/zero seat (& a plane guard helo rescue diver toot sweet). :mrgreen:
RAN FAA A4G Skyhawk 1970s: https://www.faaaa.asn.au/spazsinbad-a4g/ AND https://www.youtube.com/channel/UCwqC_s6gcCVvG7NOge3qfAQ/
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Unread post06 Oct 2015, 00:39

One reason why old seats had two handles (becuz they could) was to use the upper handle to help keep the head/helmet combo protected from windblast with the blind that came down with the handle pull but also to help keep the head upright and back straight - for the use of. Note how LCDR Kevin Finan USN Exchange pilot (ex-F-14) is checking his toes - at this moment - for clearage). Story available here: http://www.navy.gov.au/sites/default/fi ... 1-1979.pdf (10.8Mb) OR with much more in my PDFs online but this'll do.... Kev is seeable in the top left of the last photo in sequence corner in a full chute before hitting that oggin soonish like. :mrgreen:
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RAN FAA A4G Skyhawk 1970s: https://www.faaaa.asn.au/spazsinbad-a4g/ AND https://www.youtube.com/channel/UCwqC_s6gcCVvG7NOge3qfAQ/
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Unread post06 Oct 2015, 01:16

spazsinbad wrote:So. Because two reports say this on page one of this thread 'it is the helmet'? For Fsake Puhleez.


It is, and it isn't. I can understand how you or anyone else would find it confusing. The seat has NO issues. The helmet has NO issues. Combined, with a light weight pilot, if the seat over rotates...it COULD snap the pilots neck due to the increased weight of the helmet over other standard helmets. The permanent fix will be a 'software' fix for the seat.

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