Speedbird370
Heliman
Location: Sweden
My Posts This: Topic Forum | I looked at the Pletty Predator when I was looking for the right setup for my XLV but I fund out that the Predator has way to low Kv (volt/rpm) even at 15s LiPo for the stock gearing
( 12,63:1 )
you need to redo the gearing so you have approx 6,3:1 this means that the engine have to work harder to swing the blades at steady rpm,
with a 12 kw engine this may not be a big issue, but the amps will be high…
to get 12kw on 15s you will be at 235Amp
3,4V/cell x 15s = 51V x 235A = 11985Watt = 11,9 kw = 15,9 Hp ! !
and to get 10 Hp, ( enough power to drive the 3 blade heads I think ) 
3,4V/cell x 15s = 51V x 146A = 7,4 kw = 10 Hp
at 146Amp you need a reasonable large amount of mAh to
get long flight time,
say around 20000 mAh for approx 15 min flight,
and even with the new 10000 mAh cells you still need
30 of them 15s2p = 30cells
one cell 200gram ( 7 oz ) x 30 = 6 kg ( 13,2 lb ) accu
an impressive 2 kg ( 4 lb ) less then the accu for the quad Actro setup but still a lot of weight compared to the turbine setup, and if you want to carry payload you don’t want the heli itself to be to heavy to begin with
Just remember, there is another thing to keep in mind,
Vario specs say, max takeoff weight for the XLV is 20kg ( 44 lb )
/Perry |
