Modification on STOCK

STOCK 60-3 is under construction with several modifications, upper part of fuselage on the cockpit is covered with 5 mm thickness balsa sheet accepting the shape of fuel tank situated at the Center of Gravity point.
Retractable main gear holes under the main wing are covered with 2 mm thickness balsa sheet also, in order to reinforce the jointing line thing grass fiber sheet will cover including aileron servo holes, fixed main gear made of carbon fiber would be invited.
1700 mm wing span and 50 dm2 wing area show the result, lack of power might happen if regular 60 size motor is invited even with Tuned Pipe.
Countermeasure for that inconvenience might be carried out because of less power, OS 90 FX motor is prepared.  For the sake of oversized motor, main gear size should be stout enough to accept 14" size propeller.
Anyway, it is not an easy task to make up F3A stunt model to fry and to set up meeting with the competition.