Aero Radio Control

Acrobatic & 3D Scratch Builds

Extra - 35 (mkIII)

Wingspan: 1200mm, Length: 980mm, Weight: 1080g

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.

these Pin Horns suit the 3mm CorFlute combined with Dubro 845 Mini E/Z Connectors and .032 music wire.

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

Wing Detail

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)

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

More build info on Forums

Still in one piece after the Maiden Flight

Flying "Knife Edge"

In Action



  Extra - 35 (mk I)

[written off after loss of communication]



Wingspan: 1000mm

Weight: 880g

Motor: KD A22-15M Brushless Outrunner

Prop: 9x6 APC Slowfly

Fuselage, Tail, Tailwheel & Firewall (CorFlute: 3mm yellow, 3.5mm white, 2.5mm black)


Maiden Flight

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.

Almost finished

The Battery/Radio gear access hatch

All Done



page updated 29-Sep-2010

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