Stumax Aircraft - SM80-45 EDF System

SM80-40 EDF System

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The SM80-40 EDF System is a cut down version of the SM89-40. It features the same rotor as the SM89-40, machined down to suit an 80mm inside diameter shroud. The aluminium motor tube is machined to suit 39mm motors (HET) or 40mm motors (TP Power, Neu, Leomotion etc). Please specify what motor you will be using. For power levels up to 3500W the HET 700-60 series motors are an excellent choice, as are TP Power 4030 series motors. The shroud is made from solid carbon fibre which provides a super stiff base in which to mount the glass fibre reinforced injection moulded 8 bladed stator assembly which is bonded to the motor tube with aerospace grade methyl-methacrylate adhesive. Carbon fibre mounting tabs are bonded to the outside of the shroud to provide a convenient mounting solution. Compared to the original SM80-45, the new SM80-40 rotor blades are slightly narrower, which means it requires less torque from the motor at the same rpm. This allows the use of a shorter, lighter motor. Combine this with the unit weight of only 140g and it's possible to build a very light and super efficient unit.

Note that the performance figures below are for HET motors, plug and play units are now fitted with the equivalent TP Power motor.

Performance:

With an HET 700-60-1738kV motor:

8S 5000mAh lipos: 2500W
9S 5000mAh lipos: 3500W

With an HET 700-60-2085kV motor:

6S 5000mAh lipos: 2000W

With an HET 700-60-2610kV motor:

6S 5000mAh lipos: 3100W

Note that these figures are taken on a test stand with a radiussed inlet lip and open exhaust. Your figures will be close but not exactly the same as a lot depends on the voltage your lipos deliver under load, the air temperature, humidity, altitude as well as inlet duct design and exhaust duct diameter. To get an idea of how other motors may work, use ecalc (www.ecalc.ch) and use a 5.25" x 6" prop (Pconst = 1.2), 0m altitude and adjust the lipo size so that you get around 3.6V/cell under full load.