daveculp Posted September 17, 2021 Author Share Posted September 17, 2021 The 3D printed wing trailing edge came out just right. I've decided not to worry about weight any more. If I have to pose the airplane on a stick then so be it. Maybe I'll learn how to make brass gear. The resin parts can be scribed just like styrene. The right side is printing now. I spent much of the day carving out NACA scoops and drawing up the instrument panel decals. allthumbs, Landrotten Highlander, themongoose and 3 others 6 Link to comment Share on other sites More sharing options...
Dandiego Posted September 17, 2021 Share Posted September 17, 2021 Trailing edge looks great. I think vac kits can be greatly improved with 3d parts. I have 3 big vacs awaiting this same treatment. Not only detail parts but I hope to print internal support pieces as well. Dan daveculp 1 Link to comment Share on other sites More sharing options...
Oldbaldguy Posted September 17, 2021 Share Posted September 17, 2021 So does this version of the L-39 have a bit of a hump and a spine from the raised rear canopy to the vertical stab as compared to a stock L-39 trainer or am I seeing it wrong? Link to comment Share on other sites More sharing options...
daveculp Posted September 17, 2021 Author Share Posted September 17, 2021 Your're right, it does! Thanks for noticing that. I'll have to build in a hump. Link to comment Share on other sites More sharing options...
daveculp Posted September 17, 2021 Author Share Posted September 17, 2021 How did I miss the hump? It was staring right at me the whole time. Here's a shot of wing trailing edges installed and the new spine being built. Marcin_Matejko, Renegade, Oldbaldguy and 4 others 7 Link to comment Share on other sites More sharing options...
daveculp Posted September 18, 2021 Author Share Posted September 18, 2021 The project is on hold because an unrecoverable problem appeared. While I await another vacuform kit from Tigger I'll continue to work on the fuselage. See if you can spot the problem: I need a drink. Martinnfb, themongoose, Landrotten Highlander and 2 others 3 2 Link to comment Share on other sites More sharing options...
LSP_Kevin Posted September 18, 2021 Share Posted September 18, 2021 I don't see anything unrecoverable, Dave. What's up? Kev Link to comment Share on other sites More sharing options...
daveculp Posted September 18, 2021 Author Share Posted September 18, 2021 (edited) 47 minutes ago, LSP_Kevin said: I don't see anything unrecoverable, Dave. What's up? Kev I installed the wings backwards. The fuselage is wider at the rear, so it can only go on one way. This is what i get for not marking the parts with an arrow pointing forward. I considered cutting the wings off, but there's enough CA glue there to hold a real L-159 together. Edited September 18, 2021 by daveculp Link to comment Share on other sites More sharing options...
LSP_Kevin Posted September 18, 2021 Share Posted September 18, 2021 2 hours ago, daveculp said: I installed the wings backwards. The fuselage is wider at the rear, so it can only go on one way. This is what i get for not marking the parts with an arrow pointing forward. I considered cutting the wings off, but there's enough CA glue there to hold a real L-159 together. Ouch! Does that mean you installed the flaps and ailerons on the wrong edge of the wings? Kev Link to comment Share on other sites More sharing options...
LSP_Kevin Posted September 18, 2021 Share Posted September 18, 2021 Oh, and if you want to remove those wings, just stick it in the freezer overnight. The cold will make the CA brittle, and the joins will snap like a twig. Kev daveculp 1 Link to comment Share on other sites More sharing options...
daveculp Posted September 18, 2021 Author Share Posted September 18, 2021 17 minutes ago, LSP_Kevin said: Ouch! Does that mean you installed the flaps and ailerons on the wrong edge of the wings? Kev The lower surfaces are installed correctly, but the upper surfaces are on backwards. I then cut the upper surface ailerons and flaps off based on the location of the molded-in recess marking the aileron hinge line. Then I flipped it over and cut the bottom surface. End result is the upper surfaces are cut correctly but installed backwards. The lower surfaces are installed correctly but cut on the wrong edge. Link to comment Share on other sites More sharing options...
daveculp Posted September 21, 2021 Author Share Posted September 21, 2021 While I await a new kit to re-do the wings, here's the progress on the fuselage: For conversion to the L-159 type: 1. Make the exhaust area straight (parallel to red line shown) 2. Add a filet below the rudder that extends all the way back 3. Add a small fairing for a rear-facing light 4. Finish up the dorsal hump For general additional detail: 5. Cut out the NACA scoops 6. Cut out the elevators I won't print a new set of elevators until the horizontal stabs are installed. That way I'll have a final set of measurements to use. And I won't install the horizontal stabs until the aft fuselage is close to complete. While looking at photos of the L-159 on the internet I noticed something unexpected. The wing pylons seem to be perpendicular to the underside of the wing rather than parallel to the local vertical (gravity vector). It's only about 4 degrees of difference, but I wonder how common this is? Maybe it's like this on all airplanes and I just never noticed before? I've always assumed the pylons are vertical. (original photo credit: Jan Kouba Czech republic 2013. All rights reserved.) Greg W, LSP_Kevin, Landrotten Highlander and 1 other 4 Link to comment Share on other sites More sharing options...
Oldbaldguy Posted September 22, 2021 Share Posted September 22, 2021 I think most pylons fit this way because they are milspec standard and interchangeable between wings and other aircraft, so they are not “handed” like they would have to be if they were perpendicular to the ground. Does that make sense? Link to comment Share on other sites More sharing options...
daveculp Posted September 22, 2021 Author Share Posted September 22, 2021 3 hours ago, Oldbaldguy said: I think most pylons fit this way because they are milspec standard and interchangeable between wings and other aircraft, so they are not “handed” like they would have to be if they were perpendicular to the ground. Does that make sense? That makes perfect sense. I assume then that the sway braces in this case will also be angled 4 degrees from horizontal, and the store will hang 4 degrees off from the pylon centerline. In the photo it looks like the gun pod hangs this way. Link to comment Share on other sites More sharing options...
Oldbaldguy Posted September 22, 2021 Share Posted September 22, 2021 Yep. Braces and stores would be square with the pylon in most cases. Link to comment Share on other sites More sharing options...
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