Also called the Depron Spectre. Inspired by Alex Greve's (ibcrazy) Specter, designed for proximity and obstacle course FPV.
This is a great design. It can fly fast and aerobatically, slow and smooth, can carry weight like cameras and FPV gear and it looks unique in the air. It can really take a beating too. Might be a bit too nimble for a first plane but excellent once you're over that first learning stage.
6mm depron covered with packing tape
Skyshark P4X wrapped carbon fibre spars from kitesandfunthings.com
Motor ESC and servos from HobbyKing
Hot glue, double sided tape, plastic ID cards, velcro, gaffer tape.
The twin boom configuration means the motor doesn't need to sit up high, so the fuselage can be slimmer.
The forward swept wings give amazing anti-stall characteristics and increased grip in the turns. I suspect when the wing tips flex upward they give positive feedback to the turn, similar to snap flaps. A swept back wing would do the opposite. It also looks very cool in the air.
This plane can fly slow or fast and is crazy manoeuvrable even without movable rudders, and it can balance on it's tail.
The wing buildis slightly different to my previous style, with cut out ailerons rather than full span. Wingspan is 1.3m or 53" compared to IBCrazy's 40" and 48" versions.
I made a 200mm (8") x 20mm flat bottomed airfoil in two 700mm halves, then cut a wedge from each inner end to make the forward sweep when glued and taped together. The tips are about 45mm forward of the root. I also cut wedges off the wingtips so they were parallel. Naturally I cut them the wrong way first.
I removed some of the forward former in the spar channel either side of the join so the Skyshark P4X spar had a wider bend curve.
Wingspan - 1.3m (53")
Length - 80cm (32")
Airframe weight - 660g
Flying weight (2200mAh LiPo) - 850g
Motor - Turnigy 2822/14 1450kV (160W)
Prop - 7 x 4.5"
TGY 9018MG servos x 3
Depron Spectre plans and dimensions
Depron Spectre videos
Build tips and overview
Early test flights
Aerobatics on 13th Beach
Slope soaring at Beacon Point
Give it a go, it's a ripper!
Andrew Newton - anewton.net