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After the pandemicCovid 2022 I decided to build an big high wing model airplane the Dehavilland Beaver , the most used aircraft in North American an Canada . I used the Dehavilland Beaver 3D viewn plan with some modified on the wing span and the horrizontal stabilizer . More light , strong material had 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 most big scale wooden R/C model airplane which I was doing ( try on ! ) .

Wing : Was an 920 square inch and all wooden contructional wing .The wing- airfoil is NACA 3412 ..and have two piece detachable wing . Dehydral angle is 3 degree and attack angle was 1,5 degree . I used two .19 and .16 aluminium tube attached with the fuselage and fixed by six screw installe inside the fuselage . The two aileron system ( see pigures ) .are independable , each is control by one 9Kg servos , 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 . More hole in the wing foil lamina was reduce more the total weight of the wing . The right and left flap are simutanement control by an simple metalic transmission and control by oly one servos ( see pic ) All the wing covered by silver color PVC

Fuselage and stabilizer :The main contruction of the fuselage is all wooden air-frame with fourt main bar balsa wood12mm x 12mm ( 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 , two small vertical stabilizer are in place on , near the external tip of the elevator . . .

			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 : The standing of nitro engine is alumium standing engine or hard wood standing deck fixed on two layer of plywood ( see pic ). Down 2 to 2.5 degree and 1,5-1,7 degree to the right of the engine axis are require .The fiberglass canopy with alunium on the front and fiber composite at the rear and had wide sufficement iopening in air intake , given a very good form and firm mouting (see pic ) .You can use the engine from .91-.108. i used the .91 Vmax nitro engine . To augmente the power of this engine , I change the standard muffler by an new two exhaust tube muffler , and by this I can change the normal 13x6 by the 14x6 propeller which this has any trouble

Gear system : Two 2,5x 1cm stell rod and sprintable stell rod get this airplane on good see and have an sweet and safe landing ( see pic ) . The rear gear are dirigeble and srintable .

R/C system , servo & other link installation : Three 9kg-servo for elevator , aileron & two 3,5kg servo for throttle-valve and flap . An 6,5kg servo was using for rudder and tail wheel . The battery are fixed in front on the lower of the fuselage and adjust for the CG ( Center of gravity ) at 29%-30% from the front edge of the wing cross section . I used four IC 7806 to build an electronic tranformer to reduce the battery voltage from 11,1v to 6 volt , seperate on four Bec : 6v ,5A output on each Bec( see schema ) . 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 vibration of engine and the shock .


		I used four IC 7806 to build an electronic tranformer to reduce the battery voltage from 11,1v to 6 volt , seperate on four Bec : output on each Bec is 6v , 5A ( see schema) . Three in four Bec are supply to three 9kg servo , this systeme will be prevent voltage drop when all servo operate simutaneously

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 2/3 inch and down 1/2 inch for elevator . Right 3/4 and lelf 3/4 for rudder and 1/2 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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