TheFlyingBrit
Legendary member
Okay, I finally got to evaluate the Edge following last weeks diabolical flight attempt.
I connected the power meter today using the original Turnigy plush 32 - 40 amp ESC, I also refitted the original 12x6 prop and used a 3s 2200mAh battery supply.
Interesting result, first point of interest the vibration was back - so obviously a prop imbalance problem (yipee my spinner is probably okay).
I spooled up the motor, initially the voltage was 11.7v. As I reached full throttle the current peaked at 25-26 Amps and the wattage reached 260-270 max, average was around 260 Watts.
There seemed plenty of thrust, but something wasn't right (besides the prop vibration).
I checked the motor spec (Emax GT2812/09 1060kv).
1) A 3s battery with 11x5 prop should pull around 25 amps
with 1350g thrust.
2) A 3s battery with 12x6 prop should pull around 34 amps (hence my 40 amp ESC selction), the expected thrust should be 1450g of thrust.
So my setup is producing less power than the specification to start with, that is one concern.
Secondly I noticed that the motor seemed to be pointing downwards, which is odd as I seem to remmember there was no down thrust when I first built it.
I repaired the motor bay and power pod section a while back. This was following a belly land where the prop hit the ground first, damaging the motor mounting.
I am 99% certain I have flown it since then with no issues, although I am getting old and senile so who knows
.
Being naturally analytical, I had to check the motor for movement and discovered there was some flex of 5mm up and down. I realsied at this point that the down thrust was probably more pronounced than I first thought.
Next Job, remove the cowl, sensibly as it needs to go back on eventually. I always thought it should have been removable, bad design flaw having it fixed.
I can then access the motor mounting properly and decide if I should level out the motor angle ? I would like some advice on this from other builders.
Before anyone ask's I didn't recalibrate the ESC and didn't get chance to try out the new Hobby wing 50amp either, as the bullet connectors where too small for connecting to the motor leads.
Thats a job for tomorrow I suspect and a re-run of the power test with the new 50amp ESC.
I connected the power meter today using the original Turnigy plush 32 - 40 amp ESC, I also refitted the original 12x6 prop and used a 3s 2200mAh battery supply.
Interesting result, first point of interest the vibration was back - so obviously a prop imbalance problem (yipee my spinner is probably okay).
I spooled up the motor, initially the voltage was 11.7v. As I reached full throttle the current peaked at 25-26 Amps and the wattage reached 260-270 max, average was around 260 Watts.
There seemed plenty of thrust, but something wasn't right (besides the prop vibration).
I checked the motor spec (Emax GT2812/09 1060kv).
1) A 3s battery with 11x5 prop should pull around 25 amps
2) A 3s battery with 12x6 prop should pull around 34 amps (hence my 40 amp ESC selction), the expected thrust should be 1450g of thrust.
So my setup is producing less power than the specification to start with, that is one concern.
Secondly I noticed that the motor seemed to be pointing downwards, which is odd as I seem to remmember there was no down thrust when I first built it.
I repaired the motor bay and power pod section a while back. This was following a belly land where the prop hit the ground first, damaging the motor mounting.
I am 99% certain I have flown it since then with no issues, although I am getting old and senile so who knows
Being naturally analytical, I had to check the motor for movement and discovered there was some flex of 5mm up and down. I realsied at this point that the down thrust was probably more pronounced than I first thought.
Next Job, remove the cowl, sensibly as it needs to go back on eventually. I always thought it should have been removable, bad design flaw having it fixed.
I can then access the motor mounting properly and decide if I should level out the motor angle ? I would like some advice on this from other builders.
Before anyone ask's I didn't recalibrate the ESC and didn't get chance to try out the new Hobby wing 50amp either, as the bullet connectors where too small for connecting to the motor leads.
Thats a job for tomorrow I suspect and a re-run of the power test with the new 50amp ESC.