Helices
Páginas: 13 (3024 palabras)
Publicado: 10 de junio de 2012
Once dialed in, rising off the water took only a few feet with a little headwind. The wind chop proved to be no problem. Flight photos by Bingo Kohlmann.
by Paul Kohlmann
Goose
The Goose’s big rudder made lining up photo passes such as this a breeze. 28
Model Aviation
M ay 2012
www.ModelAviation.com
The Grumman Goose is ready to get its feet wet for the first time.
n theworld of aviation, icons can be found to represent each of the categories of aircraft. For civil aviation there are the ubiquitous J-3 Cubs and Cessna high-wing aircraft, while for warbirds the P-51 Mustang is a standout. In the RC world we often gravitate toward these iconic types, perhaps because the full-scale designs were so well developed that they tend to retain their successful attributes whenscaled down for our use. In the case of the flying boat, the Grumman Goose is one of these icons. Starting life in 1936, the first Goose was built to transport wealthy businessmen from Long Island, New York, to New York City. By the onset of World War II, these “flying yachts” were serving more pedestrian roles with commuter airlines, the U.S. Navy, and the Coast Guard. Gooses, as Grumman calledthem, were flown by many nations during the war, including Japan. Grumman stopped production in 1945 after 345 were made, but the Goose lives on. The Goose has been a staple of island-hopping, whether that is along the rugged coast of Alaska or the sunny Caribbean. The type is so well loved that in 2007, Antilles Seaplanes announced that it would begin building new airframes to shore up thedwindling number of originals. Familiarity and longevity are critical factors in the creation of an icon, but a little limelight helps. Hollywood has been kind, giving the Goose a central role in the TV cult classic Tales of the Gold Monkey, a cameo in the opening of Fantasy Island, and many other appearances. Last fall I heard that MA editor, Jay Smith, was looking for a Goose design in the 48-inchrange to meet a demand from AMA’s Plans Service customers.
I
The iconic amphibian electrified
www.ModelAviation.com
M ay 2012
Model Aviation
29
The fin and rudder are framed and it’s up to the builder whether to sheet the tail or keep it at its lightest.
Jumping at the chance to model an icon, I bumped the wingspan to 49 inches so that our Goose would settle in at an even 1/12scale.
Design
I’m partial to the classic stick-andtissue genre, and this struck me as the best way to produce a lightweight aircraft that would come off of the water easily. The design needed to build quickly and a simple, open structure supports that goal. After studying photos and threeviews, the design took root in SolidWorks CAD. The Goose has such great lines, there was no need to departfrom them. I created a solid rendering by building a wireframe over a threeview drawing. The rendering was sent to the virtual machine shop to be reduced to a framework. The power of CAD can be seen at this point as SolidWorks was able to calculate weight and CG, and configurations for hatches and such could be quickly tested.
Type: RC Scale model Skill level: Intermediate builder,intermediate pilot Wingspan: 49 inches Wing area: 396 square inches Length: 393/8 inches Weight: 34 to 40 ounces
A Sullivan rod keeps the exposed elevator linkage as short as possible. CA hinges were used for all control surfaces.
Power: Two E-flite Power 370 1360 Kv motors, two 20- to 25amp ESC Construction: Balsa and light plywood Covering/finish: Heat shrink film with painted trim and waterslidedecals Propeller: Two APC 8 x 3.6
The center wing rip is installed at an angle using a gauge to ensure that the top of the wing will be flat when joined.
30
Model Aviation
M ay 2012
www.ModelAviation.com
Left: The shear web, aileron, and wingtip parts are in place and the next step is to sheet between the main spar and the LE.
Goose
For those who are interested in amphibious...
by Paul Kohlmann
Goose
The Goose’s big rudder made lining up photo passes such as this a breeze. 28
Model Aviation
M ay 2012
www.ModelAviation.com
The Grumman Goose is ready to get its feet wet for the first time.
n theworld of aviation, icons can be found to represent each of the categories of aircraft. For civil aviation there are the ubiquitous J-3 Cubs and Cessna high-wing aircraft, while for warbirds the P-51 Mustang is a standout. In the RC world we often gravitate toward these iconic types, perhaps because the full-scale designs were so well developed that they tend to retain their successful attributes whenscaled down for our use. In the case of the flying boat, the Grumman Goose is one of these icons. Starting life in 1936, the first Goose was built to transport wealthy businessmen from Long Island, New York, to New York City. By the onset of World War II, these “flying yachts” were serving more pedestrian roles with commuter airlines, the U.S. Navy, and the Coast Guard. Gooses, as Grumman calledthem, were flown by many nations during the war, including Japan. Grumman stopped production in 1945 after 345 were made, but the Goose lives on. The Goose has been a staple of island-hopping, whether that is along the rugged coast of Alaska or the sunny Caribbean. The type is so well loved that in 2007, Antilles Seaplanes announced that it would begin building new airframes to shore up thedwindling number of originals. Familiarity and longevity are critical factors in the creation of an icon, but a little limelight helps. Hollywood has been kind, giving the Goose a central role in the TV cult classic Tales of the Gold Monkey, a cameo in the opening of Fantasy Island, and many other appearances. Last fall I heard that MA editor, Jay Smith, was looking for a Goose design in the 48-inchrange to meet a demand from AMA’s Plans Service customers.
I
The iconic amphibian electrified
www.ModelAviation.com
M ay 2012
Model Aviation
29
The fin and rudder are framed and it’s up to the builder whether to sheet the tail or keep it at its lightest.
Jumping at the chance to model an icon, I bumped the wingspan to 49 inches so that our Goose would settle in at an even 1/12scale.
Design
I’m partial to the classic stick-andtissue genre, and this struck me as the best way to produce a lightweight aircraft that would come off of the water easily. The design needed to build quickly and a simple, open structure supports that goal. After studying photos and threeviews, the design took root in SolidWorks CAD. The Goose has such great lines, there was no need to departfrom them. I created a solid rendering by building a wireframe over a threeview drawing. The rendering was sent to the virtual machine shop to be reduced to a framework. The power of CAD can be seen at this point as SolidWorks was able to calculate weight and CG, and configurations for hatches and such could be quickly tested.
Type: RC Scale model Skill level: Intermediate builder,intermediate pilot Wingspan: 49 inches Wing area: 396 square inches Length: 393/8 inches Weight: 34 to 40 ounces
A Sullivan rod keeps the exposed elevator linkage as short as possible. CA hinges were used for all control surfaces.
Power: Two E-flite Power 370 1360 Kv motors, two 20- to 25amp ESC Construction: Balsa and light plywood Covering/finish: Heat shrink film with painted trim and waterslidedecals Propeller: Two APC 8 x 3.6
The center wing rip is installed at an angle using a gauge to ensure that the top of the wing will be flat when joined.
30
Model Aviation
M ay 2012
www.ModelAviation.com
Left: The shear web, aileron, and wingtip parts are in place and the next step is to sheet between the main spar and the LE.
Goose
For those who are interested in amphibious...
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