One-time Aussie distributor Chris Blackwell claimed sales in excess of 200 units – and this was the American-produced version from the Maxair company. It proved no impediment that Drifter kits had to be shipped halfway around the Earth to reach the land of kangaroos. Sometime after this illustrious and energetic time, things went south for Maxair in more than just a financial way. Through a labyrinth of twists and turns, a Florida man named Don Jones ended up owning the one-time Pennsylvania company in a set of circumstances most charitably called “questionable.” At best, he kept the design alive. At worst, he sunk the design into near oblivion. Fortunately, good things tend to stick around, regardless of how badly they’re treated. The Drifter is an example. Perhaps because the Drifter made it to Australia in large numbers, the ’97 incarnation of the tandem aircraft now returns from the country on the bottom side of the globe.
Drifter SB
Seating | 2, tandem |
Empty weight | 550 pounds |
Gross weight | 1,100 pounds |
Wingspan | 30 feet |
Wing area | 156 square feet |
Wing loading | 7.1 pounds/sq ft |
Length | 19 feet 6 inches |
Height | 7 feet |
Load Limit | +6 Gs, -4 Gs |
Fuel Capacity | 15 gallons |
Kit type | Assembly |
Build time | 100 hours |
Standard engine | Rotax 582 |
Power | 66 horsepower |
Power loading | 16.7 pounds/hp |
Max Speed | ? mph |
Cruise speed | 74 mph |
Stall Speed | 36 mph |
Never exceed speed | ? mph |
Rate of climb at gross | 800 fpm |
Takeoff distance at gross | 350 feet |
Landing distance at gross | 350 feet |
Standard Features | 66-hp Rotax 582 2-cycle engine, electric start, electric primer, E gearbox, 4-blade ground-adjustable prop, dual controls, steerable tailwheel, 4-point pilot restraints, cockpit pod, windshield, in-flight elevator trim, strut-braced wings, intake silencer, after-muffler, mechanical drum brakes, heavy-duty landing gear, 15-gal fuel capacity, fuel on-off selector, full instrumentation, low-fuel and low-oil warning indicators, wheel pants. Certified to Australian standards. |
Options | 80-hp Jabiru 2200 4-stroke engine, flaps, amphibious floats, fully assembled option. |
Construction | chromate-coated aluminum tubing, AN hardware, Dacron fabric covered. |
Design
Cosmetic appearance, structural integrity, achievement of design goals, effectiveness of aerodynamics, ergonomics.
Pros - Well-recognized design with good record and popularity; now done to full Australian certification, which adds a comfort level for many buyers. Struts give a new look (old Drifter was kingpost and cable-braced). Design has proven durability, both in field operations and how long it's endured. Comfortable for big pilots. Carries a lot (550 pounds useful load).
Cons - Struts are actually heavier (yet not necessarily stronger). Aircraft gained weight over time and for certification. Price also rose with the weight. Made out-of-the-USA, a holdback for some potential buyers. Can't make Part 103 training exemption weight (496 pounds empty) as test-flown for this report.
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 - You want 'em, the Drifter SB has 'em. General aviation pilots considering an ultralightlike design will find lots to love, even including low-fuel and low-oil warning lights. Large mechanical drum brakes that worked quite well. Electric start standard. Triple fuel pump-type systems. Easy engine access for repairs.
Cons - No standard flaps (they're an option); not needed particularly, but somewhat expected on such a refined design. Brakes are unidirectional. Trim and throttle both on stiff side (though better too stiff than too loose). Throttle requires more arm leverage than a more conveniently placed lever. Dual tanks (5-gallon seatback tank plus 10-gallon belly tank) require some additional attention to where quantities remain.
Cockpit/Cabin
Instrumentation; Ergonomics of controls; Creature comforts; (items covered may be optional).
Pros - Grand front seat; you feel comfortable, protected and has arguably the best visibility of any aircraft I've ever flown - the Drifter has long set this standard. Entry is easy from a standpoint of its openness. Reach to controls, throttle and pedals felt excellent to me. Very good panel readability. Proper, appreciated 4-point pilot restraints front and rear.
Cons - Front seat entry complicated slightly by how high the seat sits. No cargo area (unless rear seat unoccupied). Seats do not adjust. No cabin enclosure possible, potentially restricting acceptance in colder climates.
Ground Handling
Taxi visibility; Steering; Turn radius; Shock absorption; Stance/Stability; Braking.
Pros - Taxi visibility, at least from the front, simply can't get any better than this. Tailwheel steering felt precise and allowed fairly tight maneuvering. Stance was highly stable and gear seemed brute strong. Brakes did a credible job of slowing the big Drifter SB. Lots of clearance for rougher field operation.
Cons - Tail felt somewhat ponderous, like it could get into a ground loop if poor technique was used, though I experienced no problems whatsoever. Nondifferential brakes no help in very tight maneuvering. No true suspension - just gear-leg flex and air in the tires. Rudder pedal stiffness slightly affected smoothness of taxi turning.
Takeoff/Landing
Qualities; Efficiency; Ease; Comparative values.
Pros - Both launch and land operations were very straightforward. Man, that visibility! You can see the whole world! Surprisingly good glide and sink rate (for such a big plane); gives comfort should the engine sputter - which it did not. Slips effective considering no side fuselage area.
Cons - Takeoff roll longer than on older, lighter Drifters. Takeoff and landing speeds recommended at 57 mph, a little fast.
Control
Quality and quantity for: Coordination; Authority; Pressures; Response; and Coupling.
Pros - Control harmony was good. Roll rate wasn't fast but was adequately authoritative for any operations. Steep turns carved smoothly. All landings done in light 90° crosswinds without any difficulty. Aircraft is highly predictable in all control modes, no doubt easing Australian certification efforts and making it a good training aircraft.
Cons - Rather stiff rudder pedals confounded my Dutch rolls a bit. Steep turns needed fair amount of back pressure (though this may be my unfamiliarity with proper use of the trim lever). On whole, the plane felt rather heavy - as it is - which for me detracted slightly from the overall experience.
Performance
Climb; Glide; Sink; Cruise/stall/max speeds; Endurance; Range; Maneuverability.
Pros - Sped right along at an easy 75 mph, though slower speed cruise was also easy and efficient. Glide and sink rates were both much stronger than I anticipated. Climbed very well solo with the Rotax 582 engine. Able to sustain altitude at only 4,800 rpm when solo and only 5,200 when dual - quite good numbers.
Cons - Not the fastest plane in the sky, maxing out at about 85 according to the installed ASI. Climb was a tad on the weak side when dual (probably why the 80-hp Jabiru 4-stroke engine is offered as an option - and it's 10 pounds lighter than the 582, according to Tiger Aviation). Overall size and weight limited slow flight.
Stability
Stall recovery and characteristics; Dampening; Spiral stability; Adverse yaw qualities.
Pros - Wonderful stall characteristics; the most I was ever able to wring out of the Drifter SB was a slight shuddering at stall. Accelerated stalls simply would not roll out radically. Longitudinal stability was very solid. Adverse yaw was on the light side of average. Extremely solid construction would seem to give great crash protection. Good emergency landing clearance and robustness.
Cons - A high-mounted engine had the usual effect of pushing the nose down on power-up (opposite of most general aviation certified aircraft), but not a problem. No other negatives uncovered.
Overall
Addresses the questions: "Will a buyer get what he/she expects to buy, and did the designer/builder achieve the chosen goal?"
Pros - Over 1,000 Drifters are flying, for good reason: this design enjoys a good safety and operation record. Ausflight's version with struts appears to improve both characteristics. Certification in one of world's toughest programs will assure many buyers. Wonderfully well-equipped as standard. Big and comfortable for almost any pilot. Fully assembled version available.
Cons - With certification came increased weight - good for durability and strength though handling suffered a little. As test-flown, cannot meet Part 103 ultralight trainer weight exemption - an FAA pilot's license is required.