Six Page Article with Building notes, photos and material list
SEMI-SCALE TWIN ENGINE STUNTER
ENGINE .15 to .25
By Paul DelGatto
Few aircraft in the 60 year popular span of aviation history, have achieved the notoriety, and become such a popular favorite as the North American B-25, "Mitchell". This could be attributed chiefly to the three historic "firsts" it achieved in World War 11. It was the first bomber to sink a German U-boat after hostilities broke out; it was the first AAF bomber to attack the Philippines after they were captured by the Japanese; and the final and most important "first" was of course the attack on Tokyo led by General Jimmy Doolittle.
This superb medium bomber served in every theatre of war completely around the world. It also achieved the distinction of being the most heavily armed bomber of its type in action on any front. The successful installation of the 75 MM cannon in the "Mitchell" in itself was a historic development of War in the air. The "B-25" was without a doubt North America's greatest contribution in World War II and a tribute to the engineering staff who made it all possible.
In designing a twin-engine stunt model of this popular craft we made several departures from scale, but tried always to maintain the rugged lines of the original scale version. From the side view there is very little to indicate that it is not scale. The fin and rudder assembly were enlarged slightly, and this was done to accommodate the enlarged stab and elevator. The scale wingspan would have been approximately 44",' but on our design we increased it a full five inches on each side, as well as increasing the average chord. The nacelles were enlarged slightly to accommodate the wider wing with it's thickened airfoil section. Fundamentally there were no changes to the basic outline of the fuselage with the exception that the wider wing reduced our tail moment arm slightly, and this we held to be in our favour.
Building the model was not quite as formidable as we had anticipated, this we could attribute to our· desire to keep it functional and for all around flying pleasure. Noticeably absent are retractible landing gears, engine control, landing flaps and other interesting niceties which an aspiring modeller can of course add, but which our own limited building and flying time would not permit.
CONSTRUCTION: Begin by assembling the essential materials required' for the job. Since most of the parts are stock you should experience little or no difficulty. With this particular model,