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3DLabPrint North American B-25J Mitchell User Manual

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User Guide

rev. 2019/12
Fully 3d printable
North American B-25J Mitchell
12:1 ~ wingspan
1.72m/68in
1
page

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Summary of Contents for 3DLabPrint North American B-25J Mitchell

  • Page 1: User Guide

    ... print your plane | www.3DLabPrint.com User Guide rev. 2019/12 Fully 3d printable North American B-25J Mitchell 12:1 ~ wingspan 1.72m/68in page...
  • Page 2 ... print your plane | www.3DLabPrint.com North American B-25J Mitchell – fully printable R/C plane for your desktop 3Dprinter Future of flying - Print your own plane. flight video The really first 3d printable bomber plane. This even bigger evolution including some revo- lutionary features.
  • Page 3 ... print your plane | www.3DLabPrint.com General specifications: Wingspan: 1720 mm / 68 inch Length: 1360 mm / 53,6 inch Height: 400 mm / 15,7 inch Wing area: 43 dm2 / 4.7 sq ft Wing loading: 83.2 g/dm2 / 27.3 oz at sq ft Center of gravity: 83mm / 3.27 in from LE...
  • Page 4 ... print your plane | www.3DLabPrint.com North American B-25J Mitchell History The North American B-25 Mitchell is a medium bomber that was introduced in 1941 and named in honor of Major General William „Billy“ Mitchell, a pioneer of U.S. military aviation.
  • Page 5 ... print your plane | www.3DLabPrint.com Included: 1. STL 3d files Universal STL files designed for use with desktop FDM 3D printers and slicer software such as Simplify3D (recommended) CURA or MatterControl (these STLs are not compatible with Slic3r/PrusaSlicer or Makerware slicers).
  • Page 6 ... print your plane | www.3DLabPrint.com 4. Gcodes Basic Gcodes prepared for direct use. We made it as universal as possible, 100% compatible with PRUSA i3 ORIGINAL and most i3 style printers. Feel free to try it out, but we‘re not able to guarantee it‘s gonna work with your printer.
  • Page 7 ... print your plane | www.3DLabPrint.com Centre of Gravity Wing area: 43 dm2 / 4.7 sq ft / CoG is 83mm /3.27 in from LE Lenght: 1360 mm / 53.6 inch page...
  • Page 8 ... print your plane | www.3DLabPrint.com Wing span: 1720mm / 68 inch page...
  • Page 9 ... print your plane | www.3DLabPrint.com Step By Step PDF/VIDEO userguide (please go through all videos) Choose airplane at www.3Dlabprint.com. Our Facebook for live information. Basic requirements for our B-25J are: at least 200/200/200mm build volume. Nozzle 0.4mm recommended. Heated bed highly recommended.
  • Page 10 ... print your plane | www.3DLabPrint.com option B FACTORY files for Simplify3D (recommended) We prepared all you need in the factory files (basic FFF profiles, parts arranged on the bed, etc.) Use our settings as a starting point and edit according to your needs (adapt it for your printer), choose the parts to print etc.
  • Page 11 ... print your plane | www.3DLabPrint.com option D CURA or MatterControl (considered as the last resort, we recommend Simplify3D) MatterControl and CURA are free and provide good results. The airframe is still strong enough, but don‘t expect the best quality. Both slicers lacks some very useful features, and finer settings, like multiple processes according to Z height, retraction options, layer start, etc.
  • Page 12 You will need: PLA filament - good quality (we need good layer bonding) Strong hair spray (or your favorite adhesive bed surface) (disregard with PEI or similar bed surface, Mk2/3...) Razor blade AND... please watch the VideoGuides: video printing guide #3 North American B-25J Mitchell - parts diagram: page...
  • Page 13 ... print your plane | www.3DLabPrint.com Basic Tips and Advice Please experiment with your extrusion multiplier to achieve the similar weights as in the list. HotEnd temperature is very important for a strong result. The reason is, the plastic leav- ing the nozzle has to melt the previous layer to create solid joint.
  • Page 14 ... print your plane | www.3DLabPrint.com 4. Assembling printed parts 4.1 Wing assembly (including Engine Gondola) See video guide #4.1 you will need: CA Glue - medium or similar medium viscosity CA glue Activator for CA Glue or similar, (gas presurized works better) Soldering Iron or any hot tool to cut holes 1.75-2mm rod/axle for flap hinge (we use fillament or toothpick)
  • Page 15 ... print your plane | www.3DLabPrint.com Proceed the way shown in videoguide: See video guide #4.1 Start with glueing the engine gondola and wing1 parts (shown in the picture below): If you want to use engine sound system, this is the time to install the self-adhesive vibration speakers, use a hot tool to cut the hole for speaker cable (the smaller area marked red in the picture).
  • Page 16 ... print your plane | www.3DLabPrint.com Continue with R and L motor mount, note: for proper function there is angle compensation for propeller slipstream so right orientation is essential, see the pictures below): !ANNEALING! We suggest to anneal the PLA motor mount. You can use this procedure: submerge in boiling water for more than 30 minutes (pla is then much more heat resistant).
  • Page 17 ... print your plane | www.3DLabPrint.com Test fit the parts together, apply glue (marked red in the picture) and assemble together engine gondola and wing1 parts: Use any hot tool to cut out the hole (marked red in the picture) for main landing gear wheel:...
  • Page 18 ... print your plane | www.3DLabPrint.com Now glue outer wing parts together (please don‘t glue the last wingtip part at this moment): Apply CA glue to the contact surfaces (marked red in the picture) and assemble them together, then apply the activator:...
  • Page 19 ... print your plane | www.3DLabPrint.com Use any hot tool and remove the hinge support (marked red in the picture): Apply CA glue to the contact surfaces (marked red in the picture) and align the parts together, then apply the activator:...
  • Page 20 ... print your plane | www.3DLabPrint.com Apply CA glue to the contact surface of the part (marked red in the picture) and insert it to the main wing part. Make sure, the aileron axle is in the right position and not contaminated with...
  • Page 21 ... print your plane | www.3DLabPrint.com For flap hinges you can use any 1.75-2mm rod (we use piece of fillament or toothpick) : Apply CA glue to the contact surfaces (marked red in the picture) and insert flap with hinge,...

  • Page 22: Fuselage Assembly

    ... print your plane | www.3DLabPrint.com 4.2 Fuselage assembly You will need: CA Glue - medium or similar medium viscosity CA glue Activator for CA Glue or similar, but gas presurized aerosol is better Soldering Iron or any hot tool 2x 3.5/20mm (max 4/30mm) self tapping screw...
  • Page 23 ... print your plane | www.3DLabPrint.com Proceed the way shown in videoguide: See video guide #4.2 Glue the fuselage parts F2-F3 with CA glue together. You can use snap knife to clean the shape of printed parts, but mostly this is not necessary.
  • Page 24 ... print your plane | www.3DLabPrint.com Proceed with glueing fuselage bomb cover parts together and use two self tapping screws to mount it to the fuselage: Glue both top_gun turret parts together: Now battery cover..., cut out both print supports (marked red in the picture):...
  • Page 25 ... print your plane | www.3DLabPrint.com Now glue the inner wings part with gondolas into the fuselage. Test fit the parts, then apply CA glue to the contact surface on the wing (marked red in the picture) and insert to the fuselage, finally apply the activator: Proceed with the opposite side.
  • Page 26 ... print your plane | www.3DLabPrint.com 4.3 Fuselage tail and assembly. Now it‘s a good time to assemble the tail stabilizers, elevator and rudder. Proceed the way shown in videoguide: See video guide #4.3 You will need: CA Glue - medium...
  • Page 27 ... print your plane | www.3DLabPrint.com Proceed the way shown in videoguide (pictures will help you): See video guide #4.3 Start with glueing the horizontal stabilizer parts: Apply CA glue to the contact surfaces (marked red in the picture) and insert them together,...
  • Page 28 ... print your plane | www.3DLabPrint.com Well, the horizontal stabilizer is completed, assemble the elevator and fit them to the mounts: Lets proceed with the vertical stabilizers: Glue both parts of the vertical stabilizer together (side by side): page...
  • Page 29 ... print your plane | www.3DLabPrint.com Assemble the rudder: For rudder hinge use a 1.2-1.5 mm wire or carbon rod. Finally use two self tapping screws to mount it to the horizontal stabilizer : Now you can slide this assembly of tail parts in to the fuselage:...
  • Page 30 ... print your plane | www.3DLabPrint.com And use two self-tapping screws to secure it: Insert carbon tube 12/750mm into the fuselage: page...
  • Page 31 ... print your plane | www.3DLabPrint.com Slide the outer wings to the slots in the engine gondola parts: And again, use self-tapping screw to secure the outer wing to the gondola: page...
  • Page 32 ... print your plane | www.3DLabPrint.com Finally attach the engine cowling, just snap it on the engine gondola: Wow, the whole airframe is finished: page...

  • Page 33: Servo Installation

    ... print your plane | www.3DLabPrint.com 5. Servo installation You will need 4-12 servos (micro size 21/12/22 HXT900, G90 or compatible) 4 servos for both ailerons and elevators is absolute minimum (just fix rudder and flaps) to fly the plane, yes you can bank‘n‘yank like this, but adding two more servos for rudder (+one for nose wheel steering) makes taking off much easier and flying coordinated turns looks much better :-).
  • Page 34 ... print your plane | www.3DLabPrint.com Proceed the way shown in videoguide (this pictures will help you): See video guide #5.1 Start with connecting the servo extension cable. Center servo to its neutral position (use your RC system or servo tester) and attach the included servo arms.
  • Page 35 ... print your plane | www.3DLabPrint.com Proceed the same way for elevator as ailerons, only insert the steel wire in to elevator bowden: Center servo to its neutral position (use your RC system or servo tester). Attach the prepared servo arms. Remember that you must slide all the servo cables in to the „servo cable tunnel“...
  • Page 36 ... print your plane | www.3DLabPrint.com Center servo to its neutral position (use your RC system or servo tester) and attach the included servo arms. Make Z bend on the end side of the wire then insert it in to the rudder arm hole, then use some gauge or just pen and mark the position of the servo arm.
  • Page 37 ... print your plane | www.3DLabPrint.com Or just use your favorite servo linkage (some Ideas bellow): page...
  • Page 38 ... print your plane | www.3DLabPrint.com 6.1 Landing gear (retractable) In this step instal both main LG to each engine gondola, and one nose steering LG... Of course you can use alternative LG Retracts, use suitable hot tool to enlarge the LG comparment if needed.
  • Page 39 ... print your plane | www.3DLabPrint.com Proceed the way shown in videoguide (this pictures will help you): See video guide #6.1 Insert LG unit then use any hot wire (marked red in the picture) and make hole for four self-...
  • Page 40 ... print your plane | www.3DLabPrint.com Relase both side screws in the LG units and remove the included 5mm LG pin. Insert the prepared main leg with wheel, properly tighten the side screws, you can make seating pads with dremel (likewise the included ones) and use thread locker (Loctite) here.
  • Page 41 ... print your plane | www.3DLabPrint.com Insert the completed nose LG into the slot and secure with self-tapping screws again: Now add steering servo and linkage, solder the pushrod into the clevis: This pictures shows the way that steerable nose LG gear works:...
  • Page 42 ... print your plane | www.3DLabPrint.com 6.2 Landing gear (fixed) You can aslo use just fixed landing gear and safe some receiver channels, but of course flight characteristic will suffer from aerodynamic drag (will be not so smooth and stable)
  • Page 43 ... print your plane | www.3DLabPrint.com Proceed the way shown in videoguide (this pictures will help you): Insert 3d printed LG unit socket into the engine gondola then use any hot wire (roceed the same way as with retractable LG) and make hole for four self-tapping screws. Secure the retract unit using all four self-tapping screws.
  • Page 44 ... print your plane | www.3DLabPrint.com Insert the completed LG units into the slots and secure with self-tapping screws: page...
  • Page 45 ... print your plane | www.3DLabPrint.com 7.1 Decals/Marking Use our prepared PDF marking - Cut decals from thin advertisement foil or use any local advertisement or graphic company. Apply it to your model by your choice. You can use also use our prepared shapes/patern (PDF) and make own paint work.
  • Page 46 ... print your plane | www.3DLabPrint.com 9.1 Final completion and setting Install your receiver, connect servo cable, setup servos and etc. with your trasmitter, check servo position. Set recommended deflections. Check CoG point CoG is 83mm /3.27 from the Leading Edge of the wing, see the CoG tags on wings. As the last step install propeller.
  • Page 47 ... print your plane | www.3DLabPrint.com 10. Pilots Please Attention! Make sure the battery is well fixed in proper position. If it moves during flight it will cause the CoG move aft and can lead to uncontrollable flight behavior. Standard CoG is 83mm / 3.27 from the Leading Edge of the wing (see the CoG tags on wings).