One of the first trikes I flew was a Cosmos, way back in 1984. It was a trendsetter then and was one stoutly built trike capable of real functions. The reason I flew and owned a Cosmos in those early ultralight days was due to its capability as a tug for hang gliders. I’ve been involved with hang gliding for many more years than powered ultralights so when the two dovetailed in the Cosmos Tug, I was pleased to the point of purchase. Maybe you’ll also be so moved. Today’s Cosmos Phase III trike is vastly better than that ’84 model. But it retains the brand familiarity (albeit with different ownership) and functionality while increasing the state of the art to a highly refined point. In the 18 years since that first Cosmos experience, I’ve flown all Cosmos entries except the Echo. This new Phase III appeared in many ways to be the French company’s finest work.
Cosmos Phase III
SOUTH AFRICAN INSTRUMENTATION - The French builder likes the South African SkyDat GX2 electronic instrument enough to buy it from a competitor's side enterprise. Note the small digital readouts below each digital/analog "gauge."
FAST PADDLER - A 100-hp Rotax 912S engine can swing a big prop as seen in these wide-chord blades. What you can't easily see is the leftward cant of the engine, done to help the trike steer straighter when substantial power is used.
EXPERIENCED INSTRUCTOR - In addition to teaching in Cosmos trikes, Arizonian Jeff Reynolds is also a sailplane instructor. He is now flying the Phase III with the smaller 12.9 Top wing and likes it.
TIDY CONTROLS - This "cruise control," or more correctly a friction-set throttle, is important to trike operation. It can be used by either occupant to set power and relieve your right foot from the spring-loaded foot throttle that is used during takeoffs and landings. Kill switches are hooded to prevent inadvertent operation.
HIDDEN AWAY - The little splash of fiberglass above the Rotax 912S is definitely cosmetic but it has the effect of partially hiding this large powerplant. Notice how neatly Cosmos integrates the exhaust system.
SUSPENDED NOSE - This detail of the Phase III's nosewheel assembly shows it has a piston suspension system, brake, and a tightly fitted fender with mud flap that keeps runway debris from flying up into your lap. Also note the shapely instrument deck, one of the prettiest among all trikes.
TUG ULTRALIGHT - Reflecting a 20-year Cosmos tradition, this Phase III is set up to aerotow hang gliders. The black cables attached to the spring aft of the nosewheel trigger the release, which routes cleverly through the center of the prop hub (next photo). Also note the hydraulic brake reservoir atop the nosewheel fork.
Tow release.
REAR DISKS - Rare among trikes is this main gear braking system that uses disk brakes actuated by a hydraulic system. They couple with the front drum brake to provide as good a stopping power as I've ever experienced on a trike. Note the tidiness of the assembly, a fine example of the trike-maker's art.
REAR PLATFORM - The aft-seat occupant in this Phase III cannot steer the trike on the ground as can happen in some trikes (useful if instructing). Note the neatly integrated intercom plug-in aft of the remote choke handle.
Seating | 2, side-by-side |
Empty weight | 356 pounds 1 |
Gross weight | 990 pounds |
Wingspan | 32 feet |
Wing area | 160 square feet |
Wing loading | 6.2 pounds per square foot |
Length | 7.3 feet |
Height | 12.0 feet |
Kit type | Fully assembled 2 |
Notes: | 1Before options; Cosmos factory lists 188 kg (413 pounds) 2Chronos Wing 16.0 needed to stay within speed limits listed in FAR Part 103, which allows fully built 2-seat trainers under exemption. |
Standard engine | Rotax 912 |
Power | 81 hp 3 |
Power loading | 12.3 pounds per hp 3 |
Cruise speed | 65 mph |
Never exceed speed | 98 mph |
Rate of climb at gross | 1,500 fpm |
Takeoff distance at gross | 200 feet |
Landing distance at gross | 200 feet |
Notes: | 3 Tested with 100-hp Rotax 912S, so 9.9 pounds per hp. |
Standard Features | Fully assembled ultralight, 81-hp Rotax 912 engine, comfortably padded "bucket" seats, removable fully-folding wing, remote choke, shock-absorbing gear on all three wheels, side skirting with inside bags, assisted wing lift for setup, 3-blade prop, instrument panel pod (without instruments). |
Options | Hydraulic brakes, 100-hp Rotax 912S engine, electronic flight deck (SkyDat GX2; see function list 4 Altimeter, vertical speed indicator, airspeed indicator, engine rpm, total engine hours, flight duration timer, battery voltage meter, exhaust gas temperature, cylinder head temperature, water temperature, air temperature, glide ratio, fuel flow meter for instantaneous and accumulated fuel used, fuel tank level gauge, and back-lighted panel. Fuel tank probe and fuel flow sending unit are optional. When purchasing the Rotax 912 engine option, oil temperature and oil pressure are included. |
Construction | Aluminum airframe, fiberglass fairings, presewn Dacron wing. Made in France; distributed in the U.S. by U.S.-owned company. |
Design
Cosmetic appearance, structural integrity, achievement of design goals, effectiveness of aerodynamics, ergonomics.
Pros - Beautifully finished trike from one of the oldest and largest trike builders in Europe. Cosmos uses La Mouette wing; since this company builds hang gliders, good handling is part of the package. With the Rotax 912 or 912S engine and optional equipment as tested, this is a very deluxe trike.
Cons - Equipped as tested, Phase III with 4-stroke engine is costly (though generally less than 3-axis aircraft). Trikes still aren't the right aircraft for the masses.
Systems
Subsystems available to pilot such as: Flaps; Fuel sources; Electric start; In-air restart; Brakes; Engine controls; Navigations; Radio; (items covered may be optional).
Pros - Trikes used to be simple machines; now an electric starter goes hand-in-glove with 4-stroke engines. Gas-piston lift system helps erect the Phase III. Very useful (South African) SkyDat electronic instrument installed in a beautifully designed pod. Three-wheel brakes were highly effective.
Cons - Cosmos still does not offer in-flight trim (as other brands do). Without an electronic gauge, remaining fuel cannot be viewed in flight. Little space available for a radio or GPS. No flaps to aid approaches. No other negatives.
Cockpit/Cabin
Instrumentation; Ergonomics of controls; Creature comforts; (items covered may be optional).
Pros - Nosewheel fender keeps debris off the occupants on sand or dirt runways. Very comfortable seats, well padded for longer flights. Trike entry is about as easy as it gets. Hand and foot throttle plus choke controls are close to reach. Smooth running 4-stroke imparts little vibration to occupants.
Cons - No trike fairing on an aircraft as deluxe and costly as this seems odd (an optional one can be added). The Phase III is speedy enough that you'll get quite a windblast in either seat. Hard to see any instruments from the rear seat. No shoulder belts provided. No rear seat steering was installed (available as option).
Ground Handling
Taxi visibility; Steering; Turn radius; Shock absorption; Stance/Stability; Braking.
Pros - LING PROS - Three-wheel brakes were exceptionally potent, as good as any light aircraft I've flown. Higher profile tires made the Phase III ride well even on rough terrain. Suspension at all wheels further softens bumps. Trikes maneuver easily on a crowded ramp. Precise ground steering (push right/go left). Great visibility.
Cons - Push right/go left steering remains foreign for many American pilots (though it remains analogous to skiing or bicycle riding). Considerable muscle is needed to hold the wing in stronger winds; checkout pilot Jeff Reynolds says he prefers the Top 12.9 wing (much smaller than tested wing).
Takeoff/Landing
Qualities; Efficiency; Ease; Comparative values.
Pros - Trike takeoffs are easy and the Phase III continues this theme. Also sets down easily; very intuitive round-out. Suspension on all three wheels eases most poor landings. Good visibility during most takeoff and landing operations. Potent climb rate with 100-hp Rotax 912S and larger Top 14.9 wing.
Cons - Trikes leave the ground abruptly, mystifying those without trike experience. Crosswinds offer significant challenges to 3-axis pilots. The Phase III offers no flaps and cannot slip to a landing (you should practice S-turns to lose altitude more rapidly).
Control
Quality and quantity for: Coordination; Authority; Pressures; Response; and Coupling.
Pros - Cosmos has long offered wings with some of the best handling among trikes I've flown; the La Mouette Top 12.9 continues this tradition. Good steep turns were easy to achieve. No adverse yaw. Trikes coordinate easily. The Phase III with the Rotax 912S handled better than expected for a heavy trike; angled engine mount helps.
Cons - Precision turns are still tough in trikes; they require practice and "finesse." With the heavy 912S engine and larger Top 14.9 wing, the Phase III was relatively heavy on the controls unlike most Cosmos trikes (Jeff Reynolds confirms it is much better with the Top 12.9 wing).
Performance
Climb; Glide; Sink; Cruise/stall/max speeds; Endurance; Range; Maneuverability.
Pros - Cosmos and the Top wings are good performers. With the Top 12.9 wing, reported speeds can hit 100 mph with cruise at 80 mph (though these speeds exceed speed limits listed in FAR Part 103). Glide performance and sink rate both seem strong as expected since the wings come from a hang glider producer.
Cons - The Top 14.9 wing, when combined with the 100-hp Rotax 912S engine, offers thrilling climb rates, however, faster speeds require the smaller 12.9 wing (not tested for this report). The lack of a trimmer device prevents high-speed cruising without arm fatigue.
Stability
Stall recovery and characteristics; Dampening; Spiral stability; Adverse yaw qualities.
Pros - Highly stable flying platform. Stalls are very predictable and unthreatening. Throttle response and push/pull-and-release tests went well, showing normal characteristics. Almost no adverse yaw to counter. Roll stability was quite good in this heavier trike with its large wing.
Cons - Trikes respond differently when power is added - carriage moves forward before the wing - which bothers some 3-axis pilots (though it is not a stability problem). Lap belts simply aren't enough if a flight is upset and reflect poorly on an otherwise very well built aircraft.
Overall
Addresses the questions: "Will a buyer get what he/she expects to buy, and did the designer/builder achieve the chosen goal?"
Pros - Cosmos trikes are built with top quality components and this Phase III is the best I've seen yet. Fully built aircraft with beautiful hardware. Experienced and established company with sales all over the world. Four-stroke powerplant will appeal to many ultralight buyers.
Cons - To get the Phase III's level of quality and components, you must pay dearly, some $25,000 for the base aircraft (which includes the 80-hp Rotax 912 4-stroke engine). Built in France and sold by Personal Flight in the USA, Cosmos prices are competitive but currency fluctuations can affect the final price.