Sorry to be so long in replying.
The best way to describe it construction is a 'stressed skin monocoque' or to put it simply carvel planking as in ship building but using 3 mm Depron sheet!
The wing is fairly conventional construction - spar, ribs and sheeting except the flanges of the balsa/Depron/balsa spar are incorporated into the wing skin itself to give the maximum possible spar depth.
The bottom wing skin with the balsa spar flange inserted in to it.
The Depron ribs and shear webs added along with the top spar flange and leading edge skin.
Each wing is now quite rigid and strong enough to handled.
With the tail booms added (they are also hollow Depron) the wing halves can be joined.
With the aileron servos installed the top wing skin is completed and the fins and tail plane added.
The elevator servo is buried in the centre of the tail plane. The servo wire runs up the RH tail boom. It is flown bank and yank so there is no rudder.
The fuselage is built as a half shell on formers over the plan.
Once it is sufficiently planked it can be lifted and the formers for the other side added.
Before the planking progresses too far the motors and ESCs are added.
The whole wing assembly can then be fitted to the fuselage and all the planking completed once the load carrying wing struts are fitted.
The battery and radio are in the cockpit.
All covered by a one piece Depron "canopy" that is held down with magnets.
By no means a beginners plane to build but the resultant structure is very light so only requires quite modest power, about 260W in total (but that's 130W/lb!) and is plenty strong and stiff enough for spirited aerobatics.
I hope this helps.
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