Originally Posted by MThemadhatter
Thanks for that,
Using motocalc that would drop the current down from ~70A at WOT to about ~55A on a 16x10 with 2Kw under load. This would would be about 0.38Kg heavier I was trying to keep the weight down. The above gives about 15lb of static thrust, I would prefer speed over prop hanging lol
Are their any good alternatives to the Eflite motor, its a little out side of my budget.
I have looked at these
The jump to 5cell is only about £25 more expensive so I can cope with that
I was aiming for 175W a pound
Your 175 watts per pound of airplane is quite feasible for a big model airplane, but it will be expensive.
IMHO, for giant scale models, your power system is not the place to go cheap. For my two giant scale models, they use the Hacker A60-16M, and A60-5S motors. These motors work very well, but they are about twice the cost of some of the other motors.
The A60-16M motor is installed in a Giant Scale Big Stick, powered by a 12S2P A123 battery pack. The motor turns a 19X12 APC-E wide blade prop at 6700 RPM on the ground, and unloads to 7200 RPM in the air, per the Castle Creations ICE data logging functions.
This power system hauls that model straight up in the air, out of sight. It's running at about 160 watts per pound.
The specs for the Hobby King motor and the Hacker motor are nearly identical. Perhaps other wattflyer readers can respond to the quality and reliability of the Hobby King Turnigy Rotomax 1.60 motor. Along with this, how accurate are the Hobby King motor's specifications? This Turnigy motor is 1/2 the cost of the Hacker motor, a significant savings. On the other hand, the specs of my eight Hacker motors are very close to their published specifications.