Carl Goldberg Super Chipmunk EP ARF

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The Carl Goldberg Chipmunk 400 is a low-wing, electric ARF exhibition/air show airplane marketed as an intermediate low-wing aerobatic park flyer-class aircraft by Carl Goldberg Models, a division of Hobbico of Champaign, Illinois USA. The model was updated and rereleased in 2012 as the Carl Goldberg Super Chipmunk EP ARF.

It was reviewed and featured as the cover story in the November 2012 edition of Model Aviation by editor-in-chief Jay Smith, who had experience with the original.

It is approximately the same size as most foam aircraft, but is jig-built of laser-cut balsa and lite ply covered with polyester film. "Street" price is comparable as well, making the Chipmunk 400 a viable alternative to foam aircraft.

The original Chipmunk's standard stick mount was designed to accomodate either a gearbox or an outrunner with the aid of an adapter, but the updated version has a motor box designed to accept the ElectriFly Rimfire 400 outrunner.

Prototype

The original aircraft, serial 116-154, is a de Havilland DHC-1B-2 Chipmunk trainer built at the de Havilland Toronto plant as part of an order by the Canadian Department of National Defense and originally test flown on August 29, 1950. Intended as a means to train civilian pilots for reserve work, the plane represented by the model was registered as CF-CXL to the Winnipeg Flying Club and delivered to them in October 1950. It was placed on inactive reserve in late 1957 and remained in storage until June 1961 when it was offered for sale.

In January 1967, after changing hands twice, the plane was purchased by Sabre Industries of Winnipeg for Robert "Skip" Volk, owner of the Aqua Craft Boat Company of La Verne, California, USA.

Volk was a friend of well-known aerobatic pilot Art Scholl. Scholl introduced Volk to flying, coached him in aerobatics and set him on the path to a career in exhibition flying with the possibility of sponsorship by Pennzoil. Modification for exhibition flight began soon afterwards and the aircraft received its final FAA registration number, N1114V.

The model's livery is that of its 1978 marking scheme and would remain so until 1985, when Scholl was killed while piloting a Pitts during the filming of the movie, Top Gun.

Scholl's widow Judy donated his aircraft to museums, with N1114V going to the EAA AirVenture Museum in Oshkosh, Wisconsin. Pilot Kevin Killingworth and Kevin Kammer, Art’s chief mechanic, delivered the plane on June 12, 1987 with 5183.5 total hours on the airframe.

Flight characteristics

In his MA review, Jay Smith describes the new Super Chipmunk as stable at mid-range throttle and capable of "lively aerobatics" at higher throttle settings. A full-throttle, vertical upline pass netted Smith two full rolls before the model stalled, further adding that an exit from the stall with a stall turn or hammerhead turn yields a realistic, air show-like manuever.

Rolls require a slight bump of the elevator to keep the model level, but the model tracks without correction through loops and combinations of loops and rolls such as Cuban Eights and Immelmann turns. While the Super Chipmunk will perform knife edge flight, it needs to be done under full power and with full rudder. It easily flies inverted with minimal down elevator.

Landings are easy, but the model's lightweight construction means it must be flared gently or it will be airborne again. Smith's method was to slowly reduce power on final and flare for landing. He surmised that it might be able to be glided in, although he hadn't attempted to do so for the review.

Specifications

  • Wingspan: 38" (97cm)
  • Wing area: 230 sq in (1484 sq cm)
  • Length: 28.5" (72.4cm)
  • Flying weight: 22 ounces (624g) with required 3S 1500mAh lithium polymer battery
  • Recommended motor: ElectriFly Rimfire 400
  • Recommended propeller: Electrifly PowerFlow 8x6 slow flyer
  • ESC: 25A brushless
  • Radio requirement: Minimum four-channel with four Futaba S3114 microservos
  • Catalog number: GPMA1928
  • Price (USD): $129.99

External links and references