The CIGAR
During the 1950s, the use of hydrofoils in
clandestine naval operations was evaluated. Some of these
operations used hydrofoils purely for rapid sea transportation. For
example the old "Beach Jumper"
units tested a Supramar design as a
personnel mover. This design was a small patrol boat that initially had
been designed for the border patrol forces of the French Navy. These
boats carried 6 to 7 personnel at speeds in the 30 to 40 knot range.
Embarkation at speed was an interesting problem that the "Beach
Jumpers" evaluated.
Out of this background a requirement was
developed for a device that could be launched from the torpedo tube of a
submarine. Such a craft was to be capable of being assembled by two
individuals after ejection. The craft was then to travel to a beachhead
at a maximum distance of 15 nautical miles at a speed of at least 30
knots, while transporting the two individuals. Near the beach area the
craft was to be submerged and its position marked while the swimmers
proceeded to shore. Upon completion of the shore operation, which might
be as long as two days, the craft was to be retrieved and proceed a
maximum distance of 15 miles for a rendezvous with the submarine.
Upon these requirements the basis for a
contractual arrangement was established. Miami Shipbuilding Corporation
was selected as the designer and producer of the craft and foil system.
The outboard marine industry undertook the task to develop a suitable,
reliable propulsion unit of 20 to 25 horsepower. Their major task was to
produce an outboard capable of lengthy submergence which would then be
floated and restarted to transport the swimmers back to the submarine.
Also, because of the nature of the intended operation, silencing of the
motor, while still producing the required power, was specified.
The preliminary design established the power
requirements and the basic configuration. The major task of Miami
Shipbuilding was to configure a hull, foil and propulsion system that
could be placed within a 21 inch diameter torpedo tube. The resulting
configuration was a three submerged foil arrangement-two incidence
controlled 18 inch span, tapered, swept back foils mounted forward on
four-foot long splayed struts and a similar fixed foil aft attached to
the bottom of a four-foot long extension of a steerable outboard motor
strut. The foil incidence control system was basically by an aircraft
type joystick to provide both differential foil movement for lateral
control and collective movement of the foils for elevation. Unlike
aircraft, fully submerged foil craft cannot be "flown" very
far, particularly at night, without some altitude sensing input. To
provide this intelligence the craft was provided with a mechanical
single forward reaching surface feeler, the motion of which modifies the
pilot joystick command.
Steering of the outboard motor/rear strut was
controlled by foot pedals, which when used together with the joystick
would provide a fully coordinated turn, just as in an aircraft. The only
other control device was the throttle.
The hull was primarily a monocoque construction
of 1/8-inch aircraft grade mahogany faced plywood. Several laminated
spruce hoop web frames were installed in strategic places. A five-gallon
fuel tank of FRP (fiberglass reinforced plastic) was molded in as an
integral part of the hull. The mahogany surface of the hull was
varnished making it look like a giant cigar, hence the name. Also,
since this project was for a Cloak & Dagger (C & D) type
operation, CIGAR seemed to take the emphasis away from the Navy
"Confidential" classification. In flight the craft
looked more like a praying mantis.
It should be noted that the name CIGAR
was not officially approved or used but during the building
process, Jean Buhler, the Naval Architect on the project, called it the CIGAR
and everyone at Miami Shipbuilding used that name through the entire
life of the project. The name stuck as the craft went through
evaluation by the Navy and Marine Corps. While never officially
adopted or assigned, that name became the one by which all participants
in the program called the vehicle.
An interesting side note relates to the Project
Engineer and principal designer of the CIGAR, Professor John
Dallas Gill. John was a graduate of Carnegie Tech in Aeronautical
Engineering and later obtained his Master's Degree from Stevens
Institute of Technology. He worked at Bell Aircraft and later at the
Kellogg Co. in rocket design and testing after which he became a
Professor of Mechanical Engineering at the University of Miami. John
became a consultant for Miami Shipbuilding Corp. on the HALOBATES (See
IHS Winter 1992 Newsletter) project during the school year and a full
time engineer during the summer months. The schedule for the CIGAR
fitted John's full time employment time so he became the Project
Engineer.
In a first review of the control set up for the
CIGAR it was noted that the throttle was on the left hand side.
When asked "Why this arrangement?" Professor Gill responded by
saying that he was going to be the test pilot as well as the Project
Engineer. You see, John had a hunting accident at the age of 14 and lost
his left arm at the elbow. In the interim he had trained himself well in
overcoming this handicap. Try tying a necktie or shoe laces, or cutting
a steak with one hand. John accomplished these feats as rapidly as most
two arm persons. When John got his private pilot's license the FAA
inspector made him wear a socket-like attachment to his left stub to
hold the joystick while he adjusted the throttle, mixture control and
pitch control with his right hand but John used the socket only when the
inspector was present.
In the photo (not shown)
of the CIGAR in flight, John is at the controls. Colonel Stafford
of the U.S. Marine Corp. is the passenger. John had started the engine
by reaching his right arm over his left shoulder to pull the engine
starter cord, then bumped the throttle ahead with his left stub while
grabbing the joystick in his now free right hand. John has been gone for
a few years now but he was a delightful, fun loving, talented individual
with whom to work, fly, sail or drink.
Another interesting side light is that at the
time the craft was being built under wraps the Navy had a contract with
Miami Shipbuilding to supply space and assistance to George Meinas in
constructing a hydrofoil for demonstration purposes. See IHS Newsletter
issue of Winter 1993. George was not to be permitted to see the CIGAR
but he sure tried hard. When the craft was completed it was moved at
night to Commodore Munroe's boat house in Coconut Grove out of George's
sight and knowledge.
An equally challenging part of the design was
the stowage problem. All the hydrofoil appendages had to be folded into
the confinement of the 21 inch diameter of the hull. At the same time to
ease assembly of the vehicle by swimmers, effort was made to not detach
the appendages but to hinge them so that they would only require
positioning for flight after being secured. Looking at the photograph,
the forward feeler swung back and over to the location where the prone
passenger rode. The forward foils and struts also swung aft to store in
the pilots location along with the joy-stick.
The outboard engine, rear strut and foil were
stowed by having the motor hinge at the transom to fit inside a hull
cut-out with the strut and foil extending but within the 21 inch circle
limitation.
The photograph (not shown) was
taken during the acceptance trials of the vehicle. All performance
requirements were met or exceeded and Phil Eisenberg, who was head of
ONR at the time, came for the trials, said the performance was amazing
and accepted the craft for delivery. The craft was shipped to
Little Creek, Va. for Navy and Marine Corp. evaluation. The
outboard used for these efforts was not the one that had been contracted
for with submersible capabilities.
During the evaluation, as everyone waited for
the new outboard, some interest was shown in the concept. A number
of Navy and Marine Corps personnel qualified as pilots. Features
of the design were evaluated including the in water assembly of the foil
system and the storage of the vehicle in a torpedo tube. The launching
of the vehicle and the shore side submergence and retrieval
demonstration were held in abeyance pending the arrival of a suitable
outboard engine. Such an engine never arrived. The reliability of an
outboard, submerged for lengthy periods was not established. With the
lack of a suitable engine, interest in the project waned and finally the
concept was abandoned. No craft other than the CIGAR were
produced.
This article reproduced courtesy of:
International Hydrofoil Society
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