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important
to me
Indoor
DuctedFan
Learjet31A
Outdoor
EDF depron
Learjet
What is
DEPRON???
Depron
moulding
Hot S-400
PIBROS
My other
homebuild
R.C.Aircraft
Metal-
detecting
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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 |
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