View Full Version : hot brushless for 7cells MPX skycat
02-06-2006, 09:28 PM
Hi i have a 2 skycat's en for powerplant i have a very big limitation.
I only have a 3300 6cell and 7cell pakcs.
So i need a hot motor. 40Amp motor and controller.
The skycat has 1m span and weight without batt and motor 1100 gr.
I have a axi 2814-10 in mind it has 1500kv rate and that is about the hottest i can find. for a 7 cell application.
propsize of 13" is the max for groundclearance (bad englisch ? )
Any other sugestions for motor. DD prefered or 3,17mm shaft motors.
02-07-2006, 03:39 AM
What about a Mega 22/20/2 which has a kv of 2875 with continous amp rating of 70 amps. However, I think the motor shaft diameter is 5mm. I also suggest the Castle Creations 45 controller or step it up to 60 amp version.
Or you could try one of the new Neu motors: http://www.neumotors.com/motors/neu_neu1100.html
Model RPM/Volt Volts Max Amps
1105/1.5Y 6800 6-9 40
02-07-2006, 10:09 AM
wath is about the highest KV i can use for a prop 10~12 inch prop.
asuming again a 7cell setup.
6800 seems more of a 1:5 or 1:6 GB
i have a trail motocalc but i'm to green to understand the numbers.
i dont even know wath prop RPM is hot or slow.
wath is a good RPM 2500 5000 or higher.
is there an optimal prop rpm ?
02-07-2006, 02:43 PM
It looks like with the Mega 22/20/2 motor direct drive you could run a 7x5 prop at around 40 amps. If you wanted to go closer to the max of the motor and you have a higher rated controller then you could spin an 8x6 prop. I am not familiar with the Skycat model. Is it a pylon racer or hotliner? Are you trying to run a folding prop?
02-07-2006, 10:10 PM
the skycat is a EPP Acro trainer.
the biggest minus ont this plane is its overweight. And thats wat try to bypass with amps and power.
Stock powered with a 12x8 @ 3:1 speed600 and according the manual 7~10cells. the second skycat is from my friend (bought it on my advise :( ) we started with 7cells then seven and a speed600 race.
Then 8cells its still needs full throthle to maintain altitude (@30A).
08-27-2006, 07:15 PM
I did the maiden flight last saturday !!
The motor i got is a Himaxx HC 3528-1000.
With a 12x8 APCe it takes 44 Amps static. And i got 5 min of flight of 7xGP3300.
Motor and battery was pretty cool after the flight ni more than 40°C
With a fresh charged batterie it goes almost vertical.
If i have to do it again i would try a light motor or some with 1100Kv
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