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On March I decided to build an low wing electric model bi-engine airplane , the Super Piper PA 23 Apache , the most used aircraft in US in 60 -70 th . I used the Piper PA 23 Apache 3D view plan with some modified on the wing span , the surface , and the horrizontal stabilizer . More light , strong material has been used to contruct this model airplane ;but the balsa wood is usually the good materiel to made its . The contruction of this aiplane is all balsa wooden air-frame renforced by hard wood; covered by thin light silver PVC . I thing this is the one in lightest wooden R/C electric model airplane which I was doing ( try on ! ) .

Wing : Was an 448 square inch and all wooden contructional wing .The wing- airfoil is NACA 3413 ..and is one piece detachable wing . Dehydral angle is 3 degree and attack angle was 1,5 degree . I used two brhusless motor 2200kv A2212 attached with the wing motor mouch and fixed by four screw installe on the wing ( see pic ) . The two aileron system ( see pigures ) .are independable , each is control by one 1,2 Kg miniservos , installed hide into the wing .The hinges of the aileron are three piece plastic hinge and installed at the middle of the rear wing bar . The right and left flap are simutanement control by an simple metalic transmission and control by only one servos ( see pic ) All the wing covered by silver color PVC and attached to the fuselage by 5 screw

Fuselage and stabilizer :The main contruction of the fuselage is all wooden air-frame with four main bar balsa wood 4mm x 6mm ( see plan ) .The desk and the upper of fuselage was renfoced by hard plywood The stabilizer elevator and rudder was standing on the right angle . . .

			The attachement of the wing to the fuselage is two .19 and .16 alluminum rod tube placed in front and rear and fixed easily by six screw in the fuselage

Engine and propeller : The two engine in used are brushless motor A2212 2200kv . The engine standing on hard 4mm plywood deck , fixed by four screw ( see pic ), ESC are two 40A each with Bec 5v , 3A , Down 1 to 1.5 degree of the engine axis are require .The styrofoam canopy covered by green PVC on the front let to see very good form and firm mouting (see pic ) . I used two right and left wooden handmade propeller to prevent the anti-torsion of the engine . The propeller size are 8x6 , its work best on 14.000rpm with 3s battery

Gear system : Three 6mm aluminium tube with 3mm sprintable steel rod get this airplane on good see sprintable gear have an sweet and safe landing ( see pic ) . The front gear are dirigeble and sprintable .

R/C system , servo & other link installation : Three 1,5kg mini servo for elevator , aileron & three 1,5kg servo for rudder , dirigable front gear and flap . The battery are fixed in front on the lower of the fuselage and adjust for the CG ( Center of gravity ) at 27%-28% from the front edge of the wing cross section . I used one IC 7805 to build an second electronic Bec supply by 7,4 v battery to prevent the lack of current supply for the control systeme when you have an overload fly ( sea pic ) . The receiver was place on the highest of the fuselage nearby the CG and sticking on the base of a rubber foam-sheet for reduce the shock .


		I used the IC 7805 to build an second Bec electronic tranformer to reduce the battery voltage from 7,4v -11,1v to 5 volt , 3A , ( see schema) this connect to the battery pin on receiver . This systeme will be prevent the drop voltage supply for receiver when we fly overload ( see pic )

The rudder and elevator's rod are two 2/8 carbone rod tube with two 2/32 steel wire fixed at the end ( see pic ) . These are light , hard and had any trouble in working Rudder , elevator , aileron adjust & flying test : Up 1/3 inch and down 1/4 inch for elevator . Right 1/3 and lelf 1/3 for rudder and 1/4 inch for the aileron . On the first fly , reduce some in the angle-effect for the aileron an elevator and slight trim down on elevator , on the first test flight ).

On a clear and calm sunday morning , I made my first flying test ......

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