22-03-2013, 08:59 PM
My FRsky telemetry is set up to measure the pack voltage. When it drops below a certain threshold then it gives an alarm if it drops below a second even lower threshold then it gives an urgent alarm.
it's great once you get used to it because the voltage can go low for a couple of reasons one the lipos are getting flat or two I'm pulling too much current. At the 10 second burst rate the pack voltage certainly does get pulled down, even with fresh lipos. because the batteries won't take that for too long it's handy to have an alarm to let you know your right on the edge as you can only safely stay there for just a little while.
As for the motor choice, you might get better efficiency going for the lower KV and a bigger prop but with more revs comes more watts and less weight, more watts & less weight means a much happier thrust to weight ratio. I allways use lower pitch props that will give more bite than a steeply pitched one. Normally I'm using a 19X6 prop and that gives AWSOME acceleration. I use modified G160s in my Yaks and Have no trouble hovering them, harriering them, or flying high alfa Knife edge, when the nut behind the sticks does his bit. They take to the air in about 15 ft if I punish the tail wheel and will go vertical from there right up to 399ft
it's great once you get used to it because the voltage can go low for a couple of reasons one the lipos are getting flat or two I'm pulling too much current. At the 10 second burst rate the pack voltage certainly does get pulled down, even with fresh lipos. because the batteries won't take that for too long it's handy to have an alarm to let you know your right on the edge as you can only safely stay there for just a little while.
As for the motor choice, you might get better efficiency going for the lower KV and a bigger prop but with more revs comes more watts and less weight, more watts & less weight means a much happier thrust to weight ratio. I allways use lower pitch props that will give more bite than a steeply pitched one. Normally I'm using a 19X6 prop and that gives AWSOME acceleration. I use modified G160s in my Yaks and Have no trouble hovering them, harriering them, or flying high alfa Knife edge, when the nut behind the sticks does his bit. They take to the air in about 15 ft if I punish the tail wheel and will go vertical from there right up to 399ft
“The knack of flying is learning how to throw your machine at the ground and miss.”
"When once you have tasted flight, you will forever walk the earth with your thoughts turned skyward, for there you have been, and there you will always long to return." ~Leonardo Da Vinci