In the 120mm to 127mm size class of fans, there are two fans claiming to produce 29 pounds of thrust (equivalent to a P-120 sized turbine). All the rest of the fans in this class produce much less thrust. The DS-94 HST with the 700kv motor and the XPS conversion of the Dynamax fan.
Here are the spec's for both fans:
DS-94-DIA HST with DSM6745-700
Inner diameter: 128 mm
Fan Swept Area: 94 cm^2
Weight including motor: 1330g (2.9 lbs)
Thrust Range: 22.5 to 29.2 lbs (100-130 N)
Exit Velocity (Efflux): 210 - 241 mph
RPM: 28,000 - 30,500
Amps: not given but calculated based on cell count and watts: 144A to 182A
Input Watts: 6.6 to 9.7 kW
Number of Cells: 12S to 14S
XPS Dynamax Pro II
Inner diameter: 128 mm
Fan Swept Area: not given
Weight including motor: not given but from other threads it was stated at over 3 pounds
Thrust Range: 29 lbs
Exit Velocity (Efflux): not given
RPM: 36,250
Amps: 205A
Input Watts: not given but calculated based on cell count and amps: 12.5 kW
Number of Cells: 16S
So, the comparison shows the following when each fan produces 29 lbs of thrust:
- The DS-94 runs at a lower amp draw than the Dynamax
- The DS-94 runs on 14 cells vs the Dynamax running on 16 cells
- The DS-94 runs at 5750 rpms less than the Dynamax
- The DS-94 consumes 2.8 kW less than the Dynamax
- The DS-94 weighs less than the Dynamax
The comparison shows the DS-94 is a lighter setup (fan weighs less and less number of cells required) with longer flight times (less amp draw and less kw consumed) when using the same amount of mAh. The DS-94 is not as low cost as some of the other fans recommended but take a look at the photos below and you will see that German quality is second to none. This weekend, weather permitting, I will be maidening a 35 pound 1/6th scale Hawker Hunter that is powered with the DS-94 HST. It will be the largest and heaviest EDF to fly with a fan in the 120mm - 127mm size class to date.
If you want to go bigger, the TF-8000 is 140mm fan that will produce 30 pounds of thrust in the 5 balded version and 40 pounds of thrust in the multi-bladed version.
Here are some photos of the DS-94 HST. The last one is of the TF-8000. If you're interested in the TF-8000 send me a PM.
Kirk