$400 to spend, any ideals

Good day GJH . Have not heard much from you as of late. What is your largest build to date . Trying to figure out the size of KDE motors I want to stick in mine . Want good torque for payload but still have a bit of speed to git there . What do they mean when they say this motor is suited for a 6s or a8s build ?
 
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Do you have any idea yet what you think the AUW will be? Add everything up before deciding on motors. The 4s, 6s,8s is the recommended battery size. As a general rule, the lower the battery voltage you can use the more efficient ( flight time ). The higher the battery voltage you can use the more power. ( lifting ability ) but at the expense of some efficiency. Look at the specs of the 4215 motors for example. Check the thrust output and efficiency for a given prop size using 4s battery and then 6s battery and you will see what I mean. I'll put the link below.
 
Notice also on the 6s battery you would spike the 55a ESC at WOT with a 18x6 prop. Get the 75a. They will run a little cooler and protect against any spikes. The lifting power is huge on these motors with 6s batteries and 18" props.
 
Good day GJH . Have not heard much from you as of late. What is your largest build to date . Trying to figure out the size of KDE motors I want to stick in mine . Want good torque for payload but still have a bit of speed to git there . What do they mean when they say this motor is suited for a 6s or a8s build ?
My largest in size is a 700mm, my largest in weight is about 3.5 pounds haha. I am looking into different motor layouts to try to get something new.
 
Notice also on the 6s battery you would spike the 55a ESC at WOT with a 18x6 prop. Get the 75a. They will run a little cooler and protect against any spikes. The lifting power is huge on these motors with 6s batteries and 18" props.
Just checking In . Have ordered a couple of parts for the frame build that I forgot when I ordered the frame . should be in this week and then I will put it together . Ive been reading up on the superX controller , read an article in a multirotor magazine . Sounds like a good candidate to do all the things I want . Not cheap tho . Hope your road trip has been going well for you . Be safe and keep the bugs out of your teeth .
 
Just checking In . Have ordered a couple of parts for the frame build that I forgot when I ordered the frame . should be in this week and then I will put it together . Ive been reading up on the superX controller , read an article in a multirotor magazine . Sounds like a good candidate to do all the things I want . Not cheap tho . Hope your road trip has been going well for you . Be safe and keep the bugs out of your teeth .
Higher voltage would make it a much better endurace quadcopter.
 
My largest in size is a 700mm, my largest in weight is about 3.5 pounds haha. I am looking into different motor layouts to try to get something new.
Higher voltage would make it a much better endurace quadcopter.
Thanks for the list of flight controllers . They all seem to have a flaw from one order to the next. Would hate to sink 4 grand into a hexacopter just to watch it flip on its back. Have got it down to a few , naza v2 , super x , wookong . Can I ask what you use and what kind of luck you had .
 
Thanks for the list of flight controllers . They all seem to have a flaw from one order to the next. Would hate to sink 4 grand into a hexacopter just to watch it flip on its back. Have got it down to a few , naza v2 , super x , wookong . Can I ask what you use and what kind of luck you had .
I have been using just a KK, but I'd suggest you get the NAZA, as long as you make sure you have enough satellites before a flight it should be fine.
 
I have been thing naza might be the way to go . Thanks GJH
I think the Naza is an excellent choice as well. I have a NAZA M Lite and a SuperX mini. The SuperX is easier to set up and fly. At least for me. The Naza has performed very well but it has not been quite as easy to set up and fly. The RTH feature on the SuperX works better than the Naza, for example The difference in flying is small but enough that I prefer the SuperX. The Super X Pro has plug and play upgrades for all the normal stuff as well as things like sonar and a cool recognition system that reacts to your hand movements. You can set the transmitter on the ground and by lifting your hands up it will take off. It will move in any direction you move your hands. Not sure what you would use it for but it's kinda cool to see. Either way, you can't go wrong. Get the one that you feel drawn to.
 
Higher voltage would make it a much better endurace quadcopter.
Ok. Help us all out here. Please explain, because everything I have read cites facts and figures that contradicts that. Just looking at the motor manufacturers charts shows about a 20% or more drop in efficiency when using the same prop and going from 3s to 4s power. You gain more lifting ability and less flight time.
 
Ok. Help us all out here. Please explain, because everything I have read cites facts and figures that contradicts that. Just looking at the motor manufacturers charts shows about a 20% or more drop in efficiency when using the same prop and going from 3s to 4s power. You gain more lifting ability and less flight time.
That is true, but I am talking about the motors being designed for higher voltage and drawing less amperage. This theoretically gives higher efficiency, but in practice you don't gain much efficiency.
 
Maybe I'm just dumb but I still don't understand. Sticking with the manufacturers motor performance charts a motor that can operate on 4s or 6s, using the same prop, always uses more amperage at less efficiency on 6s than it does on 4s. It will lift more but won't fly as long. I feel I'm missing something you are trying to teach me. I have a quad with 2206 motors that stays aloft, kind of sedately, for about 30 minutes on 2s batteries. On 3s it will go like crazy for about 17 minutes. I'm still confused.
 
This if for general three phase motors (both full sized and hobby), but the motor will be designed to run lets say 10s and will be around lets say 100kv rather than a 3s running at 333 kv The RPMs are the same, but the KV is lower allowing it to run the same prop drawing much less amperage.
 
I think I am beginning to understand. I have been trying to locate this one website that explained very well the relationship between voltage on a given motor and the longer flight times. He explained why operating at a lower voltage , up to a point, worked that way. I'll keep looking. I know what you're saying about lower kv and larger props. Look at the chart on the link below. It is the same one I showed to griz. I think you will see what I'm talking about regarding the efficiency and amp draw. Pick a prop size and compare the charts for the different batteries.
 
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