Just to clarify for everyone the motors I'm using are the NTM prop drive 28-2600 1200kv motors. Turnigy multistar 30amp ESCs 2-4S. Turnigy 3S 2200mAh 30C batteries with option of parallel. XT60s and 3.5mm bullet connectors (one pair per motor[bullets]). FliteTest Knuckle H Quad, AR6210 receiver, KK2.1 board. 8 x 4.5 props.
Battery Trouble
- Thread starter Justin
- Start date
lonewolf7717
Senior Member
a wattmeter will give you real data on actual amp draw for your given motor/prop combo. the motors you have chosen are rated for a max of 17amps. so basically you want to bench test your motor prop combo with wattmeter attached, if you are pulling more than 17 amps at full throttle you will want to downsize your prop a bit. if way under you will want to up size.
wattmeter:
http://www.valuehobby.com/gt-power-130a-wattmeter.html
wattmeter:
http://www.valuehobby.com/gt-power-130a-wattmeter.html
Not a chance of over drawing with those. I missed the prop size somehow, so I was thinking 9 or 10" props which might, depending on pitch...
The motors on most my multi's except for 2 Hex copters are RCTimer / MyRcMart (turnigy style) D-2822 / D2826 type motors. About $8 to $10 ea. The 1000kV actually came from BangGood on a cheap kit I started with once upon a time. It used tri-blade props at 9". You should be fine at 1200kV but you will have to keep the craft as light as possible. You will know as soon as you try to hover if things are correct. Hovering should be about 1/2 throttle. If hovering requires 3/4 to full throttle then you will probably need to go up to a 9 or 10" prop. As others have said a Wattmeter is of VERY GREAT IMPORTANCE and should only be $15 to $20. The payback though is very quick in that you will not burn things up or buy as many "wrong" combinations of power systems. Trial and error works BUT it is EXPENSIVE......
Thurmond
Thurmond
The wattmeter will make the trial and error a little cheaper because props are fairly cheap and can make a huge difference in lift and they also control current draw . Using the wattmeter will get you so much closer to your ideal draw without going over and let you get the most out of your power system.
Don't panic Justin, just use what you have ordered. No point is buying more parts until these are tested. (and your test will be OK).
Like xume720 said the only thing you "might" need is a bigger prop. Just build it and see how it works is the best path unless you have plenty of cash and just like to buy parts like me! LOL (that is why I now have 10 multicopters, had 11 but sold 1)
Thurmond
Like xume720 said the only thing you "might" need is a bigger prop. Just build it and see how it works is the best path unless you have plenty of cash and just like to buy parts like me! LOL (that is why I now have 10 multicopters, had 11 but sold 1)
Thurmond
I'm using 4 of these motors on a V-tail with an AUW of 1100g (not a light setup) and on 8" props it flies just fine. Plenty of power, and really zippy. go ahead and use these to learn to fly and you *will* break props so buy both 8" & 9" replacements -- 8" for learning, experimenting and having fun, 9" for lifting gear.
Please be assured, you are fine with what you have ordered. I know at this stage you can scare yourself really easily by thinking you have ordered something you can't use. These motors are fine. Better even since you can use them with larger props for heavy lifting and still be fine.
Okay, thanks. I feel much better now. Thank you 
I really hate that feeling. I felt sick when I was deciding if this whole quad was worth it ($500), but now I know I have made the right decision. Will I have to change my battery now since it demands more amps. I don't think I do. Battery is 3S 2200mAh 30C Turnigy with option of running in parallel. I can safely supply 68 amps constantly. With a 9" prop, amperage ranges from x amps to y amps. A 9 inch prop is not rated on HK's website and that kinda scares me. http://hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=25084 Would a four cell damage this setup? A three cell? Please continue this discussion or any motor discussion on my "Knuckle H Quad motor issue", located in the E motors category under "The Workbench".
I really hate that feeling. I felt sick when I was deciding if this whole quad was worth it ($500), but now I know I have made the right decision. Will I have to change my battery now since it demands more amps. I don't think I do. Battery is 3S 2200mAh 30C Turnigy with option of running in parallel. I can safely supply 68 amps constantly. With a 9" prop, amperage ranges from x amps to y amps. A 9 inch prop is not rated on HK's website and that kinda scares me. http://hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=25084 Would a four cell damage this setup? A three cell? Please continue this discussion or any motor discussion on my "Knuckle H Quad motor issue", located in the E motors category under "The Workbench".
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