Always choose motors last?

[poohbear]

How do you guys plan out your motor choices? Too much you lose flight time, not enough and running 80% to hover. But you don tknow the total weight until the build is done...

I will be running a standard quad, something like an f450 or possibly discovery style. FPV in the future and the pixhawk with GPS and telemetry. No gimbals yet but possible, always have a go pro 3.

So I was thinking I shoudl be in the 900Kv realm. Looking at the 800 or 900 V series from sunnysky? Buy some props and see what matches best.

How do you guys decide? I have seen teh calculator. But I wont know what the total weigh is.

 

[poohbear]

................

 

[fltundra]

How do you guys plan out your motor choices? Too much you lose flight time, not enough and running 80% to hover. But you don tknow the total weight until the build is done...

I will be running a standard quad, something like an f450 or possibly discovery style. FPV in the future and the pixhawk with GPS and telemetry. No gimbals yet but possible, always have a go pro 3.

So I was thinking I shoudl be in the 900Kv realm. Looking at the 800 or 900 V series from sunnysky? Buy some props and see what matches best.

How do you guys decide? I have seen teh calculator. But I wont know what the total weigh is.

http://www.ecalc.ch

 

[gtranquilla]

It's a learning process..... with a target all up weight and target total flight time. Shop online and note the weight of each item in your Excel database and add it all up. Then run it all thru ecalc again and again with adjustments to prop sizes, motors, batteries etc. until eCalc results give you the target flight time. Hint: Longer motor arms allow for larger diameter props. Larger diameter props need to be turned slower for the sake of efficient air time so you need lower KV motors. As the AUW goes up so will the need for the battery cell count, i.e., 6S batteries needed for more powerful 400 KV motors etc.

How do you guys plan out your motor choices? Too much you lose flight time, not enough and running 80% to hover. But you don tknow the total weight until the build is done...

I will be running a standard quad, something like an f450 or possibly discovery style. FPV in the future and the pixhawk with GPS and telemetry. No gimbals yet but possible, always have a go pro 3.

So I was thinking I shoudl be in the 900Kv realm. Looking at the 800 or 900 V series from sunnysky? Buy some props and see what matches best.

How do you guys decide? I have seen teh calculator. But I wont know what the total weigh is.