55 inch 3-blade/tri-blade carbon fiber propeller for mega UAV Drone Airplane paramotor paraglider
55 inch 3-blade/tri-blade carbon fiber propeller for mega UAV Drone Airplane paramotor paraglider Packaging & Delivery Selling Units: Single item Single package size: 80X25X22 cm Single gross weight: 1 kg Package Type: blister paper box with outside carton box Picture Example: Lead Time : Quantity(Sets) 1 - 2 >2 Est. Time(days) 7 To be negotiated Specifications Material: Carbon Fiber Includes : 1 sets of CW or 1 sets of CCW propeller Epoxy resin cover Size:27.5 inch each blade, 3 blade diameter is nearly 55 inch Matt color Condition : 100% Brand New 1.High strength 2.Light weight 3.Corrosion resistant 4.High temperature resistant. MP23850 38kv Eprops: tri-blade propeller ESC: 100v 300A or 120v 500A flier esc Voltage Current Thrust(KG) 98V 33A 24.8 98V 64A 40.3 97V 100A 54.3 97V 134A 65kg 97V 160A 75.7 97V 190A 83.1 97v 200A 88.5 97v 210A 92 90% throttle For a paramotor use, the propeller must : - be exactly adapted to the engine and the RPM - give the best thrust - be ultra-light to be as reactive as possible, and to guarantee a long life to the engine The freerchobby propellers are very different from the other propellers. They have special profiles, patented designs, and special position of the blades to reduce the blades drag, so to obtain the best thrust. 1- Propeller efficiency Propulsion efficiency factor is calculated from propeller diameter and engine power. This efficiency factor is the max achievable propeller efficiency. Then, it is up to the propeller designer to come closer to this limit. This software allows the team to imagine new propellers concepts, by using particular geometries and profiles developed inhouse. That is why propellers are very different from other propellers proposed at present on the market. When we speak of efficiency, we obviously speak of thrust and also of fuel consumption. A propeller which has a better efficiency allows to reduce the fuel consumption of the engine. 2- Blades number For a paramotor use (it means low speed), for the same diameter, more blades = more efficiency. A 3-blades has a best efficiency (= a best thrust) than a 2-blades. => Please note : This is true if the blade form is exactly adapted to the configuration : a blade of a 2-blades propeller mounted on a 3-blades or 4-blades hub would not give the best performances. The "universal" blade for any configuration does not exist. Every propeller has a dedicated blade geometry, or the efficiency would not be the best. 3- Propeller diameters [return to top] The increase of the diameter is better for the efficiency, because of the improvement of the pusher efficiency. More thrust is obtained with a propeller with a diameter of 150 cm than with a propeller with a diameter of 125 cm. With the same number of blades, the thrust gap depends on the diameters and on the engine + reducer. 4- Propellers : 2-blade / 3-blade [return to top] Some people are saying that the wake of the third blade of a 3-blade propeller is crossing the wake of the 2 other blades, and this phenomenon decreases the efficiency of the propeller. That's wrong. The wakes of the different blades cannot crossed themselves. It is physically impossible, because the blade's wake is sweeped away by the wind. Demonstration :