F-8E crusader.
03-25-2017, 02:40 AM
#76
Great work Oli, but how DO you find the time AND fly for EK?
I see ,too, you are using those fabulous JRNX 8931 servos, just refitted several models with them.
Will you be using a screw jack for wing incidence, convinced it's a better system than servos?
Now, when you finish the Crusader, how about a Hunter ,say, 1/4 scale, to the same quality, as I hear the TomaHawk quality is not up to their usual standards.
David.
I see ,too, you are using those fabulous JRNX 8931 servos, just refitted several models with them.
Will you be using a screw jack for wing incidence, convinced it's a better system than servos?
Now, when you finish the Crusader, how about a Hunter ,say, 1/4 scale, to the same quality, as I hear the TomaHawk quality is not up to their usual standards.
David.
03-25-2017, 11:01 AM
#79
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Hi guys,
Facebook. DCModels
The model posted is my model. I'm very close to flight.
https://www.youtube.com/watch?v=5JkGSDE2gJc
Facebook. DCModels
The model posted is my model. I'm very close to flight.
03-26-2017, 09:50 PM
#84
Thread Starter
A couple of renderings of the main gear assembly.
The first version will be pneumatically actuated. The landing gear struts diameter, shape, angles and attachment point are exactly scale.
The tires are 3D printed from a rubber material and true to scale to 0.15 mm.
They are hollow and reinforced with a 3D honeycomb pattern that enables me to adjust their deflection on the ground with the model weight to reproduce a scale effect.
The brake calipers and wheel disc is an assembly that is 3D printed and that clips on the brake hub.
It is easy to remove and replace in case it gets knocked off during a hard landing.
Apart from the tires and disc/caliper assembly that are 3D printed, the main gear is 100% CNC cut in-house from certified Al 2024 T3 on our Siemens machines.
The first version will be pneumatically actuated. The landing gear struts diameter, shape, angles and attachment point are exactly scale.
The tires are 3D printed from a rubber material and true to scale to 0.15 mm.
They are hollow and reinforced with a 3D honeycomb pattern that enables me to adjust their deflection on the ground with the model weight to reproduce a scale effect.
The brake calipers and wheel disc is an assembly that is 3D printed and that clips on the brake hub.
It is easy to remove and replace in case it gets knocked off during a hard landing.
Apart from the tires and disc/caliper assembly that are 3D printed, the main gear is 100% CNC cut in-house from certified Al 2024 T3 on our Siemens machines.
03-30-2017, 04:45 PM
#86
Thread Starter
Some detail shots...
The skin wrinkles show a little bit on this picture. The flaps and slats are live hinged and have a curved quadrant.
The wing center section is designed to stay on the plane ( but can be removed with a bit of work ). The outer wing sections are removable for transport. Both inner and outer flaps are operational and live hinged.
The engine hatch is behind the wing and covers the wing tilting mechanism.
The 3D printed nose strut and tire.
The skin wrinkles show a little bit on this picture. The flaps and slats are live hinged and have a curved quadrant.
The wing center section is designed to stay on the plane ( but can be removed with a bit of work ). The outer wing sections are removable for transport. Both inner and outer flaps are operational and live hinged.
The engine hatch is behind the wing and covers the wing tilting mechanism.
The 3D printed nose strut and tire.
03-31-2017, 10:15 PM
#89
It is a variant of the resin used at Airbus.
This one allows me to fuse the parts at the closing process.
Let me explain how this works.
The shells are vacuum infused up to 50% of the polymerization cycle.
The cycle is then stopped by cooling down the molds.
The bags, draining membranes and peelply are removed, then the internals are glued on with the same resin.
The molds are closed and post cured again to achieve 100% polymerisation.
This specific resin is designed to force exo strucutral chemical bonds in the second 50% phase of the polymerisation.
This enables us to fuse the internals with the shells and create a semi-monocoque structure.
This one allows me to fuse the parts at the closing process.
Let me explain how this works.
The shells are vacuum infused up to 50% of the polymerization cycle.
The cycle is then stopped by cooling down the molds.
The bags, draining membranes and peelply are removed, then the internals are glued on with the same resin.
The molds are closed and post cured again to achieve 100% polymerisation.
This specific resin is designed to force exo strucutral chemical bonds in the second 50% phase of the polymerisation.
This enables us to fuse the internals with the shells and create a semi-monocoque structure.
I'm not sure any gushing I can formulate is worthy of the effort - but I am truly amazed.
Last edited by Eddie P; 03-31-2017 at 10:18 PM.
04-02-2017, 11:11 AM
#92
Thread Starter
We have already extensively tested a simple configuration with balsa covered foam core wings. However the first Crusader was much lighter at 21 lbs dry vs 30 lbs dry for the final design prototype ( with flaps, slats and wing incidence mechanism ).This prototype should be starting its test flights after Top Gun.https://www.ultimate-jets.net/collec...ader-1-7-scale
05-25-2017, 10:05 AM
#96
Thread Starter
The nose gear is finalized. This is the production version, CNC cut from Alcoa Al 6061. The strut cover is laser 3D printed...
And here is the real thing.
And here is the real thing.
Last edited by olnico; 05-25-2017 at 10:07 AM.
06-18-2017, 06:22 AM
#100
Thread Starter
I finished the ejection seat of the Crusader.
That was some work!
The CAD file was made from the Vought blue prints and Martin Baker Mk7 pictures at scale 1/7.2.
All the rivets are there. The seat adjustment pushrods and cables are all reproduced to scale.
All the ejection handles, chute devices and survival kits are reproduced. The bottom seat cushion is hinged, like the real thing.
The cushions are hollow to save weight and fabric textured.
The seat is laser 3D printed at 50 micron resolution.
The seat is hand painted.
That was some work!
The CAD file was made from the Vought blue prints and Martin Baker Mk7 pictures at scale 1/7.2.
All the rivets are there. The seat adjustment pushrods and cables are all reproduced to scale.
All the ejection handles, chute devices and survival kits are reproduced. The bottom seat cushion is hinged, like the real thing.
The cushions are hollow to save weight and fabric textured.
The seat is laser 3D printed at 50 micron resolution.
The seat is hand painted.