In No. 10 for the year 2007 was published material designer homebrew A. Knyazeva from the city of Rasskazovo of the Tambov area made them a few snowmobiles. More detail in the publication was lighted the fifth design with the engine M-11FR from the Yak-18U, cabin and ski from the Yak-12. Today the author talks about his sixth, and as he says, the most successful design.
The basis for the design of the latest model has served the aggregates and components from the written-off aircraft Yak-18A. First, it is aviation engine AI-14R. The nine-power radial engine made 240 HP, but because the screw need to it was appropriate.
The solution was found, and the original and simple. A feature of the engine AI-14R is that it has a gearbox with left-hand rotation of the output shaft. So it established the pulling screw from the Yak-18, right rotation and adjustable in-flight pitch. In the embodiment of the snowmobile when the engine is left rotation is “backwards”, this pulling becomes pushing screw that, strictly speaking, required. The hydraulic actuator to change the pitch of the screw mounted on the sled.
As you know, the stable operation of the engine really depends on its thermal regime. For this powerplant was abandoned airplane hood with controlled leaf shutters. Because the snowmobile powerplant rotated 180°, the blinds in the closed position to hold the heated air under the hood. The hood — quick, and the blinds are controlled from the cabin using the knob and pull. In addition, for heating the air entering the carburetor, a heat exchanger made own designs, using for heating exhaust gases of the two lower cylinders.
Snowmobile AK-6:
1 — fencing of the propeller; 2 — propeller (Yak-18, modified); 3 — the hood and the engine AI-14R (N=240 HP); 4 — support struts and the struts; 5 — rear shock absorber (aircraft); 6 — body (cabin of the aircraft Yak-18A, modified); 7 — front shock absorber (aircraft); 8 — ski (from the Yak-12, 4 pieces); 9 — rear suspension (left and right—mirrored); 10 — front suspension (right, left — mirrored); 11 — thrust steering
Fork mount rear shock absorber-to control arm (steel 45, 40X, 2 PCs.). The damper shaft is fixed in the fork pin
The left half of the mounting bracket of the rear shock absorber to the body of the snowmobile; the right half is mirrored (St.3 or 45 steel, 4 PCs.)
Snowmobile cabin is also heated. The heat produced from one of the sections of the exhaust manifold and heated air is supplied inside the cab including the front windshield with the fan duct.
The cabin was a fragment of the fuselage of the decommissioned aircraft Yak-18A, subjected to alteration. First, changed the front shape from rectangular to conical with a cone. From the rear, just behind the canopy, cut the tail part of the fuselage and welded additional power frame for attaching the rear ski suspension and sub-frame (pole). The cabins, dismantled all the partitions. The front instrument panel with the seat of the first pilot moved forward a little. The copilot’s chair pushed up to 350 mm back. This allowed a second cockpit to install two additional seats from the car ZIM. They are comfortable enough and folded them, you can organize cargo Bay. To improve visibility has been increased glass area in the front of the lantern.
Chassis snowmobiles — four. All four skis have independent suspension with suspension struts aircraft struts. Themselves skis from the Yak — 12. They are metal and have in the design of the hog gimbal, allowing the ski to some extent be rotated about its longitudinal axis. For snowmobiles, these skis are very valuable when riding on slopes, rough roads, and in any case they samoustraniajutsia on his entire bearing surface.
Snowmobile AK-6 in the process of construction. In the frame of the nose cone is clearly visible the steering mechanism with a bipod and two connected rods
AK-6 with a cab of the Yak-18, engine AI-14 and ski from the Yak-12 to the test
AK-6 wheel chassis
Double-wishbone front suspension (right, front) shock absorber. Here the pendulum arm steering arm and knuckle
All hinge joints of the suspensions are mounted on silentblock (rubber-metal bushings) that ensures quiet operation and a smooth ride.
Suspension rear snowmobile ski — single lever, front — double wishbone, made of pipes, like a race car.
The rotary nodes of the front ski used car GAZ-21 “Volga”, is unfinished.
The steering gear is also from GAZ-21, but fry his own design, with two tapered holes instead of one as usual. Since the steering mechanism is located in the middle of the gauge, then to fry at the same time fasten the two tie bar, United each with its pendulum arm. Yourself levers was bent, but now straightened, to not collide when turning in the body.
The snowmobile is easily converted to wheeled option, in the aircar, so that in summer they can be ferried from place to place in the yard, or even towed on a rigid hitch in remote areas where it is already possible to move on their own.
Later, when fuel prices increased significantly, the operation of the engine AI-14 due to the high fuel consumption (about 38 liters per hour) made a slip. For this reason, the snowmobile installed the rebuilt engine M-11FR-1.
The power of this engine was 160 HP, but it worked fine on cheap gasoline A-76, the consumption of which amounted to little more than 20 liters per hour.
Of course, the dynamics of the sled with this engine has decreased, but the maximum speed remained still higher than was necessary — about 110 km/h.
Summarizing, we note that the two latest designs of the snowmobile were pretty good and I got a great moral satisfaction from the process of technical creativity on the stage of their creation, and from traveling on this, in General, exotic form of transport.
Technical characteristics of the snowmobile AK-06
Dimensions, mm:
length……………………………………………………5800
the width of the cabin……………………………………….800
width on ski…………………………………2700
cab height…………………………………..1500
height of screw…………………………………….2720
Ground clearance, mm……………………………300
The propeller:
type……………………………………pushing VISH
diameter, mm…………………………………………2300
Engine:
type……………………………………………………..AI-14
power, HP…………………………………………240
Average fuel consumption, l/h……………………38
Brand of used gasoline……………..AI-92
The mass of the snowmobile, kg……………………………….780
Useful load, kg……………………………..400
Number of seats…………………………………3 — 4
Maximum speed, km/h………………….130
Gradeability, deg………………..30
descent grad………………………………………………40
Minimum turning radius, m……………9,5
A. KNYAZEV, Rasskazovo, Tambov region
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