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Indoor
DuctedFan
Learjet31A


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EDF depron
Learjet


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..Outdoor Learjet31A..

With twin speed-300 ducted fans.

This is a relatively small, light weight, low wingloading,
good looking model aircraft, ment to have fun with on those long,
calm summer evenings.

The yet unpainted model.


It handles very easy, is not very fast, but fast enough for good looking
scale speed. There is power enough for a looping, or inverted flight.
Stall is very gentle and straightforward.


Now all this sounds good. But to achieve a good power to weight ratio the batteries should not be to heavy. So I started testflying with a six cell pack sanyo N-600AA, just because I had these cells. Performance was good ehough, but I was not too happy with the 3 to 5 minutes flying time. Next I tried a 7 cell pack N-500AR, but with 3 to 5 minutes the flying time was about the same. After that I tried 6 cells sanyo KR-1400AE. Finally the flying time was where I wanted it with 7 to 10 minutes. Power performance is a little less compared to the 7x500 pack, but the 6x1400 pack is ideal for cruising around at slow speed.

wingspan (wing only): 88cm (34.7in)
wingspan (with winglets): 101cm (40in.)
effective wing area: 17 sq.dm (264 sq.in.)
wingloading: 28 gr/sq.dm (9.7oz/sq.ft.)
fuselage max. diam.: 12cm 4.7in.
total length: 110cm (43.3 in.)
battery: 7cell 500mAh, NiCd, or
  6cell 1400mAh NiCd.
flying time 3-5 minutes on 7x500mAh, or
  7-10 minutes on 6x1400mAh
weight ready to fly: 480 gr. (17 oz.)@7x500mAh
  550 gr. (19,4oz)@6x1400mAh
no landing gear  
 
controls: motor speed, elevator, rudder. no ailerons
servo's: 2x eos 9 gr.
speed control: schulze slim 18be
receiver: multiplex mirco 5/7, case removed.
fuselage: depron, 3mm, hot moulded to shape.
wings: styrofoam, clarck-y, hollow inside, hot wire cut.
 
specifications of the ducted fans:
motor: speed 300, weight 50gr. (1.8oz.)
weight one unit: 60 grams (2.14oz.)
duct material: light styrofoam, hotwire cut.
stators: 3mm depron, hot bended to shape.
duct inside diam.: 52mm. (2in.)
duct outside diam.: 70mm (2.8in.)
duct lenght: 115mm. (4.53 in.)
static thrust one unit: 140 gram (5 oz.) @7cells 500mAh
current draw one unit: 7.4A @ 7 cells 500mAh
for ducted fan construction pictures click here.