Propellers
AMS propeller systems designs are focused, with these to gain advanced performances. AMS serial propeller systems are ground adjustable and fixed pitch propellers for engines with powers between 40 hp and 100 hp and with propeller diameters from 100 cm to 180 cm. AMS designs are specialized on folding propellers.
Folding propellers reduce drag while not in use, thereby allowing for more speed or reduced fuel consumption. The folding propeller causes far less drag than a feathered variable-pitch propeller. The folding propeller also offers advantages with respect to storing the airplane in a transport trailer.
AMS folding propellers are of simple mechanical designs, thus safe and reliable. They are by choice folded forwards or back-wards in flight.
Folding propellers are spun outwards by centrifugal force when the engine is turning, but when the engine stops, the pressure of airflow forces the blades forward or back. Typically, the blades are geared together so that they open and close in unison.
Send us the completed questionnaire and AMS will be able to offer you a good selection of propeller blade type and propeller diameter suitable for your needs.
When the engine is started, centrifugal forces open the propeller at once and propeller is immediately operational. Without any other additional necessary activity in the propeller control for the pilot in the cabin. AM-FF( )-( )/( )-( ) type propeller hub section mechanism design follows good and proven solutions of forward-folding, two-bladed propeller AM-F3-1A/140-( ) of the Carat touring motorglider.
AM-F3-1A/140-( ) is the forward-folding, two-bladed propeller with fixed pitch and with the diameter 140 cm. Its hub section mechanism design is a good and proven solution of forward-folding. It has been developed for the powered glider Carat with a tractor mounted engine in order to reduce drag when the powerplant is switched off.
With further development ground different adjustable propellers, for engines with powers between 40 hp and 100 hp and with propeller diameters from 100 cm to 180 cm, were added.
At ground adjustable forward-folding propeller systems blades have aluminium alloy holders for fixating the propeller blades where the blades angle is adjustable on the ground, between pre-set limits of fine and coarse pitch.
The propeller has an aluminium alloy hub containing the specially coated blade journal bearings. Spring retainers and the spinner mounting plate are also attached to the hub. The spinner cover is screwed to the spinner mounting plate.
Folding shafts which are attached to the blade roots and on which the outer pinion wheels are mounted, are bedded in the blade journal bearings. The gas-loaded springs engage into the pinion wheels pushing the blades forward and thus folding the propeller when it feathers at an appropriately low airspeed. The propeller unfolds using the centrifugal force of the blades which, even at the lowest rpm, is strong enough to compress the springs.
The pinion wheels are designed to fit tightly into each other with virtually no play when the propeller is folded but to have much play when unfolded so that, when in operation, each blade can compensate centrifugal force, thrust and spring tension appropriately and individually. No bending moment is transferred from the blades to the hub thus protecting the crank-shaft of the engine which, in turn, results in smoother running of the engine.
The pinion wheels ensure that the blades unfold / fold together. Unintentional unfolding due to oblique airflow or mass forces during recovery manoeuvres, for example, is thus impossible.
The blades are glass-fibre and carbon-fibre with a hard foam core. The propeller PU varnish with fine finish and the polyurethane leading edge protection tape protect the blades from the effects of weathering, particularly that of rain. This construction is a light-weight allowing constantly high efficiency at a low noise level.
Back folding propeller is the propeller for powered gliders and specific airplanes with a pusher style mounted engine in order to reduce drag when the powerplant is switched off.
AMS back folding propeller is a unique solution with ground-adjustable pitch of the blades. The pitch changes may easily be adjusted on the ground to optimise the aircraft for current payload and flying conditions, to achieve maximum efficiency. Exchangable blades available are for different engine powers and aircraft performances, rotation can be right or left hand.
The propeller has an aluminium alloy hub with flange compatible for different engines, blade holders are of two parts each so that the blade is clamped in between. These blade holders with fixations for blade axle stopsat energy absorber rubber stoppers. Blades holders are mounted to hub with blade axles via bolts-screws, with the specially coated blade journal bearings and with smart designed folding springs.
The blade skin and blade inner parts are made of carbon composite materials, namely fibre reinforced plastic. Blade’s base is made of alluminium alloy and stainless steel tubes, which lies within to ensure blade’s safe attachment to the propeller base (hub). Having different blades they are designed and tested for engine power between 40 hp and 100 hp.
The propeller blades PU varnish with hand finish and the polyurethane leading edge protection tape reduce noise and protect the blades from the effects of weathering, particularly that of rain.
AMS propeller systems designs are focused, with these to gain advanced performances. AMS ground adjustable are for engines with powers between 40 hp and 100 hp and with propeller diameters from 100 cm to 180 cm.
AMS ground adjustable propellers are two, three or four bladed. Configuration can be pusher or tractor.
AMS can offer you also different accessories for propeller systems and special propeller systems according your needs.
If you need aluminum mounting spacer, spinner, aluminum adaptor spacer, special designed blade, blade system adjusting tool or equipment, contact AMS.
AMS can also provide the development of special propeller systems according to your application needs, as well for larger engine powers, greater than 100 hp, for smaller engine powers, less than 40 hp, and for correspondingly larger or smaller propeller diameters of 180 cm or 100 cm.
Send us the completed questionnaire and AMS will be able to offer you a good selection of propeller blade type and propeller diameter suitable for your needs.
Ca11_performances.pdf