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Geezer
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Joined: January/19/2008
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| Posted: September/26/2022 at 5:48am |
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Cool jet, I think the gear looks great!
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Rule 1 Power, Use lots, don't be needy!
2 Build light they fly better!
If it was easy everyone would do it!
There's a reason its called scale and not similar.
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ScaleAero
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Joined: September/09/2003
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| Posted: September/26/2022 at 7:04am |
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One of the unique features of this first gen supersonic carrier based fighter is its "limited" amount of wing fold though Grumman had plenty of
experience designing full and half folding wings. Note the Light Gull Grey Over Insignia White. I assume International Orange was China Lake
development color.
Per Wiki: The F-11 Tiger is noted for being the first jet aircraft to shoot itself down. On 21 September 1956, during a test-firing of its 20
mm (0.79 in) cannons, pilot Tom Attridge fired two bursts midway through a shallow dive. As the trajectory of cannon rounds decayed,
they ultimately crossed paths with the Tiger as it continued its descent, disabling it and forcing Attridge to crash-land the aircraft; he
survived. Not faster than a speeding bullet.
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Ed
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ps2727
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Joined: February/01/2005
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| Posted: September/27/2022 at 10:59am |
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The main gear parts are 3D printed. I made room for an aluminum tube that glues into the main strut. The lower part that telescopes is a stainless steel tube. The outside of the strut is wrapped with carbon fiber cloth ap plied with epoxy and sanded out. It works great at this size so the next test is at a larger scale. This method makes possible those airplanes with unusual gear and can be done by anyone with access to printed parts.
Even the wheel hub was printed and was assembled around a foam tire. A brass tube was glued in as a bearing surface.
Paul
 
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ScaleAero
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| Posted: September/27/2022 at 11:43am |
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Paul,
Legs look great. What is the strut exterior printed in...PLA or ABS? Was
printed slip tolerance difficult to maintain considering it appears you
printed it as a single piece tube.
I am about to print the A6 main strut exterior as a facade in front and rear
halves which then are Hysol'd to Robart 150HDE10 lengthened to 14.
You've shown your gear skills extend way beyond stainless ;^) 
I heard Butch's 58 is back on his front burner...are you legging it?
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ps2727
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| Posted: September/27/2022 at 1:10pm |
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Thanks Ed,
I should have mentioned the material is PLA on advice from DirtyDee. He thinks it’s a better material for this than ABS because it’s not so flexible. My concern with PLA is the softening in the heat but didn’t happen here. The carbon wrap certainly helps with that. The only problem I saw was one of the scissor links had the 1/16” pin fall out so I may enlarge them to take a 2-56 bolt and locknut.
Tolerance was not an issue as I inserted an aluminum outer into the main strut (it’s in the photo). I find stainless an aluminum make a nice oleo action.
I like your approach to your A-6 gear. Let us know how it works out.
Haven’t done anything on the B-58 lately, but I made 4 sets a few years ago so I’m sure they will use one of those.
I’ve been lurking on your build and know you will have a winner!
Paul
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navy
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| Posted: September/27/2022 at 1:25pm |
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Nice job Paul (aka Sharp pencil), keep the photo's coming.
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ScaleAero
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| Posted: September/27/2022 at 1:44pm |
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Paul,
The aluminum~stainless mismatch should create an almost self lubed slip. I was considering using a single layer of CF veil as an external wrap to resist PLA's temperature shape change. What resin did you use, Hysol or epoxy in the CF lay-up? The 6 is coming along with all oars pulling in the same direction again.
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ps2727
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| Posted: September/27/2022 at 2:36pm |
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I used a slow cure epoxy i can get locally in larger quantities but its just a standard epoxy
I didnt think about veil but thats a good idea as i had 5.7 oz carbon and was a messy operation to get the legs covered. Teflon plumbers tape helped hold it all in place for the cure. Ill try a few layers of veil net time.
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