Speedy "Red Swept Wing 2" RC

This is the big version of the Speedy Red Swept Wing. It has now a wingspan of 1510 mm and weights 1250 grams. Like the small wing, all sections of this big one were only hold together by two cords inside the tubes.They are fixed with luster terminals on the wing ends. Only the two red middle sections, each consisting of 4 parts, are glued together. This should have the big advantage to print and exchange only a very few parts - in case of crash. It seems that this method is not secure enough for this big plane. And as you can see on the video, it finally crashes. It would have been better if the parts were glued together. Now there are some more parts to print... https://www.youtube.com/watch?v=mUGuW6KuunY Unfortunately, the camera got lost during the second flight. Most likely when it started to flutter, just before the crash. It was only fixed with velcro tape. I miss much more the videos than the camera itself. Update 8.October 2016 Helmut, who also printed the motor sailplane http://www.thingiverse.com/make:158813 was so kind to share his parts of the splitted fuselage with the associated interfaces. The biggest part is now 160 mm. Thank you Helmut. Here is a video of his own printed airplane https://www.youtube.com/watch?v=KQO3qlDL3Ts Update July 30, 2022 upload "servo segment mod.stl" and "servo insert D1015 mod.stl". The servo segment is now notched on both sides. This makes it easier to print. The servo insert has now the same width (45 mm) as the servo segment. Update 23. January 2018 Upload large fin, though I think it is not necessary. fin 140.stl fin cap 140.stl Update 12. March 2020 For those who have big printers I uploaded wing parts wing center 320 wing outer 350 wing outer 350 brim Print Settings Attention The wings are designed to print with 0.5 width, 0.3 hight and 3 bottom and top layer If you print thinner, the perimeter of the upper side will not merge with the perimeter of the inner spars. If you print thicker, the perimeter will not be printed continuesly in one turn. The print must go as if you print in spiral vase mode. So you reach at least a smooth surface on the upper side. If needed, you must try with 0.49 or 0.48 width. It depends on which slicer you use. The second thing is, if you print with less layer hight, the inner spars will not connect the top and the bottom layer. There will be a gap inbetween. All parts: layer height =0,3mm, width =0.5 mm wing 1 perimeter, 3 bottom layer, 3 top layer, hollow wing servo: 3 bottom layer, 3 top layer, hollow elevon base: 5 bottom layer, spiral vase mode elevon: 3 bottom layer, spiral vase mode elevon interface: no bottom layer, spiral vase mode elevon horn: 10 bottom layer, 60% infill fuselage fuselage front: 7 bottom layer, 3 top layer, 40% infill fuselage middle: 1 bottom layer, 1 top layer, hollow fuselage back: 3 bottom layer, 3 top layer, 40% infill fuselage interface: 2 perimeter 0.4 no bottom/top layer, holow fin: 5 bottom layer, spiral vase mode fin cap: 2 bottom layer, 40% infill Update 08/07/2016 I just noticed that the middle wing parts have an offset of 0.7mm to the outer wing. I deleted the files and upload the modified parts with added "mod" Update 10/8/2016 Helmut, who also printed the motor sailplane http://www.thingiverse.com/make:158813 was so kind to share his parts of the splitted fuselage with the associated interfaces. They are splitted in 4 pieces, the biggest part now is 160 mm. Thank you Helmut. Update 10/10/2016 I added templates to align the splitted wing parts of the middle section. Print as much as possible of a template, position it diagonal and shorten only the front of it. Furthermore, they are important to get exactly the same hole spacing for the plug in mounts. Update Oct 23, 2016 Servo cables Attention! before gluing the middle wing segments, the openings for the cables must be cut out. If the edges are welded with a soldering iron, the interrupted print structure is connected. For the opening on the fuselage you can use a the cover frame (cable cover frame) Update Jan. 18, 2017 Uploaded wing_rear_center_mod2160 At the previous file were lacking three top layers. Aligning the middle wing segments Not only the wing profile has to be aligned, but also the hole spacing for the connections must fit exactly. For both, I uploaded templates: template center at the root, template 160 mm at the inner connection template 320 mm at the outer connection Print as much of the stencils as possible (diagonal). shorten it only on the front.(netfabb) If a larger gap occurs (because of shrinking) between the groove and the spring, it must be filled with glue. Connectors 6 mm carbon tube The holes for the connections are only parallel: 1. In the middle, between the wing halves (99 mm in each side, 198 mm total) In addition, reinforce these tubes with 4 mm carbon tubes glued into the inside! 2. At the servo segment (50 mm in the middle wing and 37 mm in the outer wing (133 mm total) 3. At the wing end (29 mm in the wing and 40 mm in the wing end (69 mm total) The pipes must not be inserted deeper. There the holes bend and break very easily if you go deeper! All other connectors are not parallel, that means, you have to plug in the tubes one after the other, and see that you can get them out again, if needed. If both pipes are inside, the wings can not be pulled apart! Between the two middle wing parts I recommend 60 mm deep plugs (120 mm total) Between the outer wing parts, I recommend 40 mm deep plugs (80 mm total) The wing end can be left plugged and, for example, secure them with screws. All other parts have to be glued and not only fasten with strings! (see video) I will try not to glue the middle plugging, so that the wing remains plugged into two halves. For this purpose, I want to make the centering blocks under the wings thicker, so that one can turn a screw in each block. Then clamp together these two screws with rubber bands. (see new image) Specifications airfoil: KN209838/HM50T10% - twist: -4.5° wing span: 1510 mm wing chord: 259.5/195 mm CoG: 117 - 124 mm from leading edge overall weight: 1250 g wing weight: 716 g fuselage weight 146 g fin weight 12 g wing area: 34.9 dm² wing loading: 36 g/dm² longitudinal stability (Thies) STFs: motor: Robbe Roxxy BL Outrunner 2834-08 static thrust: 1000 g (3S Lipo) battery: Turnigy 1800 mAh 3S 40~50C Lipo motor camber: -4° side pull: no propeller: Aeronaut CAM Aeronaut Carbon Classic 10 x 6"