Aero Radio Control
Acrobatic & 3D Scratch Builds
Extra - 35 (mkIII)
--== Specifications ==--
Wingspan: 1200mm, Length: 980mm, Weight: 1080g
Motor: Turnigy AerodriveXp SK 35-36C 1400kv 550w Brushless Outrunner
Motor Controller: SuperSimple 40-50amp Brushless ESC
Battery: Turnigy Nano-tech 2200 mAH 3S 25C (3cell, 50+ amps) Li-poly
Propeller: APC 11x5.5E
increased aileron size with tapering, overall wing area remains the same.
CF control rods to tail surfaces.
Increased control surface travel, up to 45deg.
Higher kV Motor and smaller prop
Mark III Fuse pattern
Landing gear mount glued on, Servos mounted, and aluminium tail wheel bracket cut out.
Wing spar holes formed just below wing centre line as the spar is channeled into the underside of the EPS Wing Core.
Cowl is formed to suit final firewall and motor layout, finished off with matching electical tape.
air vent for motor on underside of cowl
Alloy Landing Gear Struts and drop mechanism.
Aluminium support for the tail wheel has a forward tab hooking up into the corflute and then secured with fibre tape.
The elevator and rudder contain 3mm C/F tube supprting the cutout sections. Note the expanded flutes.
aileron servo mounted under the corflute, embedded and glued into the EPS wing core
Place a 1" thick foam block behind firewall to protect the battery from nose inpact.
I used a 50amp Opto-isolated ESC, and therefore required a Voltage Regulator to power the RX & Servos.
Tail Detail & measurements
EPS Foam core 525(L) x 157(W fuse)x 100(W tip) x 25mm thick (at cord).
Draw a line down the cord and sand fore and aft of the line to form airfoil shape.
Cut a channel down the underside cord for the wing spar to be expoxied in flush.
Note that folded wing section measurements are top down plan based and do not allow for the shaping.
ie. Allow extra on the trailing edge for folding, then trim to size after glueing with contact adhesive.
Extra - 35 MKII (sold)
--== Specifications ==--
Motor: Turnigy TR 35-36C 1100kv Brushless Outrunner
Motor Controller: Turnigy Plush 40amp Brushless ESC
Battery: FlightMax 2200 mAH 3S 30C (3cell, 60+ amps) Li-poly
Propeller: APC 12x6E
The Base Outline Plan (control surfaces were enlarged significantly)
Cutting out the Fuselage
Cut a small piece of corflute to act as the primary bulkhead at the back of the cockpit, also forming the turtle deck shape.
Glue a plywood piece to the fuse floor as a gear mount. Run 2 BBQ skewers into the flute under the plywood to act as anti-compressors to stop the gear strut squashing the flute when bolted on.
Cut out a Styro foam block as a fuselage inner spacer to run the carbon fibre tubes through. (see note for MKIII about using 8mm square tube) Run a BBQ skewer through the back section to act as an anti-rotation pin for the wing. Slot the vertical stabiliser into the horizontal tail piece.
Flat Scan of the Firewall Cutout showing angles
Fuse folded with Motor on Firewall, Gear, Tail & 6mm Carbon Tubes
Alternatively, use 1 x 1000 x 10mm sq C/F Tube for wing spar
Polysterene (EPS) Foam forms the inner wing shape
Wing Foam core 500(L) x 195(W fuse)x 100(W tip) x 25mm (at cord)
EPS glued onto CF Tubes
Flying "Knife Edge"
Extra - 35 (mk I)
[written off after loss of communication]
Motor: KD A22-15M Brushless Outrunner
Prop: 9x6 APC Slowfly
Fuselage, Tail, Tailwheel & Firewall (CorFlute: 3mm yellow, 3.5mm white, 2.5mm black)
Bandits, Six O'Clock!!
No problem, it flies rings around the maggies!
Safe Landing, bandits dispatched.
BLISter I (retired)
[This is the first of my many scratch-builds. It flew OK but was dogged by a heavy tail. The Blister II was much improved with use of lighter CorFlute]
Fitting the Outrunner Motor
Folding the wing from 3.5mm CorFlute Signage, it was a bit heavy.
The Battery/Radio gear access hatch
page updated 29-Sep-2010
back to BLIS ARC