Ejection Seat Redesign

[jrsteensen]

Redesign Ejection Seat based on RTM's reference mesh:

• Two part design: Headrest & Main Rails with separate seat bucket, using shims to adjust seat up and down from Neutral Seat Reference Point (NSRP), while maintaining constant design eyebox.
• Keep seat bucket supports (from floor) as wide as possible to maintain clearance for stick mechanism.
• Ensure stick does not interfere with seat through full range of motion.
• Support a 250lb pilot.
• Ensure sufficient clearance underneath seat to not conflict with stick pitch springs and mechanism.

Hardware

• Use 90081A144 Domed Screw Nails as faux rivets throughout.
• Use domed MDF PHS as required.

OH3A2A-100 - ASSY, SEAT BUCKET, SJU-17

• Add cosmetics
• Add MDF HW
• Add inserts and machine screws for mounting seat sides to bucket.
• Add mounting screws for Manual Override Handle switch.

IDEAS & BRAINSTORMING

Frame:
2X Machifit 200-1000mm Black 2060 V-Slot Aluminum Profile Extrusion Frame for CNC Tool DIY - 1000mm ($25.75/ea)
4X Machifit 4040 Industrial Aluminum Extrusions Right Angle Inclined Bracket Connector Reinforced Black

Seat Bucket:
2020 along bottom, 2040 along back with hinge at bottom
2X Machifit 4040 Industrial Aluminum Extrusions Right Angle Inclined Bracket Connector Reinforced Black

Aluminum Extrusion

[jrsteensen]

Updated issue to reflect complete seat redesign.

[uxixu]

Might mention that the safe arm handle looks like it has safe on the side too low, instead of towards the edge, as it does in game (DCS).

[jrsteensen]

@uxixu I'd love to look at it! Please shoot me some pictures, though DCS has enough inaccuracies that it is a reference of last resort on this project.

[uxixu]

Google Fu not turning up but seems plausible given the way it hinges. Might be too low right now. A safe apears written on the spine, too. Here's from page 78 of Chuck's Guide. I only have Daco for the Tomcat but if one has the Hornet version may be there in cockpit picture. Or in another aircraft using NACES.

[uxixu]

Remembered that F-14D used NACES and DACO shows a couple, though kinda looks like someone hand wrote safe on the side, though engraved on spine.

[uxixu]

That was pilot. Here's RIO. Definitely lower than ED's/Chuck's.

[jrsteensen]

It proabably is, I'm looking for verification on the proper model of ejection seat though - the F18 seat we are creating is a late model SJU-17. A much earlier model was used in the F14, so its not an apple to apples comparison.

[jrsteensen]

Pushing this to a post-beta release.

TODO:

• Rail->Bucket Integration
• Bucket HW
• Rail->Pit Integration <- This item will be accomplished during center tub design.
• Add shims under bucket
• Mount OVRD SW MOUNT
• Add Seat Bucket Cosmetics
• Design Seat Placards
• Add Carbon Fiber Cosmetic Wrap to Lower Headrest
• Add Carbon Fiber Cosmetic Wrap to Seat back.
• Add faux rivets to headrest. Add rubber pads where appropriate to headrest.
• Add ABSIS Nano to seat bucket
• Verify wiring paths for seat.

[jrsteensen]

Pulled this back to beta1 after some significant work on a v1 seat to bring it to 1.5 was discovered. Decided time was better spent on v2 instead. Seat bucket almost done.

[jrsteensen]

• Add shims under bucket Went to full knob/rail interface. Seat bucket is still going to be heavy, but this primes the seat for a future mechanical raise/lower solution. You can still make some shims if you want to. :-)
• Add seat decals Handling under Seat Decals #362
• Add faux rivets to headrest.
• Add rubber pads to front of headrest. (This was a mis-memory. The headrest should be wrapped in a thin layer of faux-leather.)
• Redesign Drogue Deployment Catapult to allow for installation of catapult and parachute container.
• Add PVC body for Drogue Catapult. (Oops. Oversight. Thanks DG!)
• Redesign Parachute Deployment Rocket to allow for installation of catapult and parachute container.
• Add lifting handles and handle storage locations. (Approximately 75-100 lbs, two person lift.)
• Add ButtKicker mounting provisions.
• Add rear rail plate to stiffen rail system
• Verify rail hardware
• Add horizontal rail behind ejection handle between lower seat rails (to prevent splitting the rails like a wishbone outwards.)
• Shift "lower headrest" cosmetics directly underneath parachute container/headrest.
• Evaluate ejection handle height vs seat. (Add note to drawing for every inch of seat cushion thickness past design, add inch to handle.) - Broken out to Evaluate ejection handle #368
• Integrate seat into center tub/NHA (vibration isolated mounting.) - Handling under Center Tub Structure #14

[jrsteensen]

Closed by above reference.