The Buratinu is a smaller derivate of the Buratino which was designed by Bil in St. Petersburg.
Thank you Bil for the great design.
With its pointed nose I was optimistic that I would manage the CG problem, which is always tricky with printed planes.
The original has a wingspan of 1800 mm. I designed it for a wingspan of 1300 mm with slightly more sweep back.
The video is on YouTube https://www.youtube.com/watch?v=HTmxjgw0Mq4&t=165s
Helmut uploaded a great video to show how to launch it by hand:
And this is the exciting maiden of Peter's Buratinu - inclusive stress test ;)
Detailed information about the development from the beginning and a lot pictures of the parts can be found on rc-network
http://www.rc-network.de/forum/showthread.php/682097-Drohne-aus-St-Petersburg-drucken
Recommended Print Settings
Attention
The wings are designed to print using 0.5 mm width, 4 bottom and 4 top
layers, no infill, 1 perimeter only.
Should you print thinner walls, the perimeter of the upper side will not stick well enough
to the perimeter of the inner stiffening construction.
If you apply thicker walls, the perimeters will not come out continuously in one
uninterrupted turn.
The layers must build up as if you were printing in spiral vase mode. Only then you get a
smooth surface on the upper side.
If unsatisfied with the results, try out 0.49 or 0.48 width in your slices settings. It
depends whether you use Cura, Slic3r, S3D or what you have. I suggest you experiment with
some tests before printing the whole thing.
The second point is: Should you print lesser layer heights, the inner stiffening
construction will not connect well to the top and bottom layers. You will suffer a gap inbetween.
All wing parts:
layer height =0,25mm, width =0.5 mm, 1 perimeter, no infill
W1, W2: 4 bottom layer, 4 top layer
W3 servo: 3 bottom layer, 4 top layer
W4, W5: 3 bottom layer, 3 top layer
W6: 3 bottom layer, 5 top Layer
winglet
2 perimeter, layer hight =0,2 mm, width =0,5 mm, 2 botton layer, 3 top layer, 25% infill
winglet slim
2 perimeter, layer hight =0,2 mm, width =0,5 mm, 1 botton layer, 2 top layer, 6% infill
elevon inner: 6 bottom layers, spiral vase mode, no top layer
elevon outer: 3 bottom layers, spiral vase mode, no top layer
elevon joint: no bottom/top layer, spiral vase mode
All fuselage parts: layer height =0,2mm, width =0.5 mm
fuselage 1: 3 perimeters, 12 bottom layers, 3 top layers, 40% infill
fuselage 2: 3 perimeters, 2 bottom layer, 3 top layer, no infill
fuselage 3: 2 perimeters, 2 bottom layers, 3 top layers, no infill
access panel and bracket
layer height =0.2 mm, width =0,5 mm
spiral vase, no top/bottom layer
Length of carbon tubes
Diameter 8 mm
fuselage/W1/W2 front: 305 mm
fuselage/W1/W2 rear: 400 mm
W2/W3/W4: 105 mm
W4/W5: 40 mm
Diameter 6 mm
W5/W6: 59 mm
Diametern 4 mm
elevons 420 mm
Specifications
airfoils: own design
wing span: 1300 mm
wing chord: 480/140 mm
CoG: 220 mm from the front of the fuselage
overall weight: 1245 g
wing weight one side complet: 342 g
wing area: 32 dm²
wing loading: 39 g/dm²
motor: Propdrive 28-36 1200KV
propeller: Aeronaut CAM Aeronaut Carbon Classic 10 x 6"
static thrust: 1300 g (3S Lipo)
battery: Turnigy 1800 mAh 3S 40~50C Lipo
motor camber: tilted -1.5 degrees
Update 16th April 2019
Uploaded elevon parts for smaller printer
- elevon inner cut
- elevon rudder horn
- elevon joint inner
If you want to print the wingend with the winglet in one, you can now take the following part:
- W6 incl. winglet
The base of the winglet is 1.5 mm thick.
This thickness must be completely filled with solid layer. E.g. 6 solid layers each 0.25 mm high.
Update 16th April 2019
Uploaded
- fuselage front mc4 sp2 hd25
- stop rib
It has a motor bulkhead with 4° motor camber, 2° side pull and 4 mm holes with hole circle 25 mm.
Instead of the front pass hole there are thin bars for a stop rib for the battery.
Update 17th May 2019
Uploaded fuselage 1 mc4
It has already integrated 4° motor camber.
The hole pattern is rotated 90°.
Update 7th October 2020
For those who have a rear-mounted motor, I have designed a special fuselage nose.
fuselage 1 rear-mounted mc3
firewall rear-mounted
It has already integrated 3° motor camber.
Update 7th December 2021
exchanged fuselage 1 mc4 (mod)
wersy
