The tube receiver, relays, batteries and servo motors (above left) inside the fuselage “cabin” of Multibug. There is a good reason for the squared off trailing
renowned physicist. His new design is the best size for all ’round performance with sin- gle channel equipment.”
The next plane for Walt was the WAG. Introduced in the April 1954 issue of Air Trails, the WAG was designed to fill the
edges (above right) on the rudder and elevator. They give smooth control through small deflections.
need for a sturdy Stunt R/C plane and also serve as a sport plane for everyday flying. The WAG had a 5-foot span, a wing area of 4.5 square feet and had a wing loading of a pound per square foot. A Clark Y airfoil was used for speedier flight with washout in the
wing tips to prevent tip stalling. A Forster .29 was the engine of choice for this plane. In 1958 Walt designed the Multibug and the plans were published in the January 1959 issue of American Modeler. The Multi- bug was designed especially for the dual pro- portional radio control systems using rudder and elevator. It was capable of a smooth pre- cision pattern and also a full AMA Stunt pattern of the day.
Walt reported that on the very first flight of PHOTO: MODEL AVIATION AMA
Bob Noll with his Berkeley Royal Rudderbugas it appeared on the cover of Model Aviation. This is a replica of Bob’s first R/C model. The replica is powered by a Veco .19 and the original was powered by a Webra .15 diesel.
FLYING MODELS
the Multibug the pullout from a shallow dive was accompanied by a loud fluttering noise emanating from the plane. Keen eyed ob- servers said the tips of the stab were just a blur several inches thick. Momentarily the elevator control stick was weak but then the noise disappeared, the stab stopped vibrating and the plane landed safely only to be packed to the workshop for an important addition. A small brass weight was fastened to the end of the elevator control arm. The purpose was to balance out the mass of the elevator surface. This completely cured the flutter trouble. The Multibug as published had a Fox .35 at 3 degrees of right thrust and a Bramco throttle. It weighed 6 pounds. The early Multibug employed the NACA 4412 wing section which is 12% with a flat bottom. Problems with outside loops led Walt to build a wing with a modified 4412 airfoil to give a semi-symmetrical airfoil. A characteristic of the Multibug was the squared off trailing edges of the rudder and elevator. The reason being that for propor- tional flying the control surfaces should be effective right down to small angles. Other planes of the day had very neatly tapered trailing edges. I would like to mention that today’s Pattern planes all have squared off wing, elevator and rudder training edges for this very reason. The Multibug was the last R/C plane de- signed by Walt Good and he gave Multibug to the AMA museum in 1978. I had the pleasure of having Walt Good as a contest- ant at several Aeroguidance Society Pattern contests that I CD’ed. Walt, along with his good friend, Howard McEntee, made many visits to Endicott, NY in the 1960s. In 1970 Walt dropped out of power flight and began flying R/C sailplanes. He is a member of the Model Aviation Hall of Fame and the Vin- tage RC Society Hall of Fame. He left us on July 19, 2002.
61
Page 1 |
Page 2 |
Page 3 |
Page 4 |
Page 5 |
Page 6 |
Page 7 |
Page 8 |
Page 9 |
Page 10 |
Page 11 |
Page 12 |
Page 13 |
Page 14 |
Page 15 |
Page 16 |
Page 17 |
Page 18 |
Page 19 |
Page 20 |
Page 21 |
Page 22 |
Page 23 |
Page 24 |
Page 25 |
Page 26 |
Page 27 |
Page 28 |
Page 29 |
Page 30 |
Page 31 |
Page 32 |
Page 33 |
Page 34 |
Page 35 |
Page 36 |
Page 37 |
Page 38 |
Page 39 |
Page 40 |
Page 41 |
Page 42 |
Page 43 |
Page 44 |
Page 45 |
Page 46 |
Page 47 |
Page 48 |
Page 49 |
Page 50 |
Page 51 |
Page 52 |
Page 53 |
Page 54 |
Page 55 |
Page 56 |
Page 57 |
Page 58 |
Page 59 |
Page 60 |
Page 61 |
Page 62 |
Page 63 |
Page 64 |
Page 65 |
Page 66 |
Page 67 |
Page 68