Part list (will this work?)

P

parman

New Member
Hi,
I'm new to quadcopter and even if I read many guides, I'm still not sure if this will work together.
I'm planning to buy these parts: http://www.ebay.com/cln/cz2014_jee/kvadrokoptera/229337751011 plus Turnigy 9X Transmitter + Receiver from hobbyking ( http://www.hobbyking.com/hobbyking/store/uh_viewitem.asp?idproduct=8992&aff=224284 )
Could you guys please check it?
I'm expecting it to 5 minutes of flight. The motors should have 440g thrust each one (is this right?).
The whole quadcopter should weight about 655 grams (I have table of weight per every part https://ctrlv.cz/qRsx column E, line 15 are totals)
I'll be great if I could mount GoPro (even without gimbal) on it.
The part when I'm really unsure are motors + props.
Thanks for every help.
 
H

HDtallrider

Well-Known Member
Hi, parman. Welcome. 2 things I noticed right off: The props won't work with those motors. You need a single hole with a hub. The battery is way to large. A 30c 1600mah 3s or about that size is what you need. I couldn't access the whole ebay website for your country so I am unsure about the controller and add ons. The Turnigy is a great radio so that should be fine. Are you going to do FPV? Hobby King has some great offerings for that. Don't forget a power distribution board/harness and some bullet connectors and wire plus a couple of XT60 and JST connectors. Some nylon standoffs and nuts and bolts to mount the controller etc..
 
GJH105775

GJH105775

Off and on
Moderator
HDtallrider said:
Hi, parman. Welcome. 2 things I noticed right off: The props won't work with those motors. You need a single hole with a hub. The battery is way to large. A 30c 1600mah 3s or about that size is what you need. I couldn't access the whole ebay website for your country so I am unsure about the controller and add ons. The Turnigy is a great radio so that should be fine. Are you going to do FPV? Hobby King has some great offerings for that. Don't forget a power distribution board/harness and some bullet connectors and wire plus a couple of XT60 and JST connectors. Some nylon standoffs and nuts and bolts to mount the controller etc..
Click to expand...


Exactly like Tallrider said, also can you provide links to your parts, or a description of things like amp draw/supply, voltage and other needed details if you can't provide links? Am I reading it correctly that the motors, ESC and props all com in one set?
 
P

parman

New Member
HDtallrider said:
Hi, parman. Welcome. 2 things I noticed right off: The props won't work with those motors. You need a single hole with a hub. The battery is way to large. A 30c 1600mah 3s or about that size is what you need. I couldn't access the whole ebay website for your country so I am unsure about the controller and add ons. The Turnigy is a great radio so that should be fine. Are you going to do FPV? Hobby King has some great offerings for that. Don't forget a power distribution board/harness and some bullet connectors and wire plus a couple of XT60 and JST connectors. Some nylon standoffs and nuts and bolts to mount the controller etc..
Click to expand...

Thanks about the props. I even didn't knowed there are different mounting ways. About the battery - I think 1600mAh is verry small. I have enought thrust to carry the 3000mAh battery, and even if I used calculator ( http://multicopter.forestblue.nl/lipo_need_calculator.html ) - 4 motors, 15A per motor, 2A for equipment(LEDs, APM, GPS), 11.1 Volts, it calculates 3 minutes of flight on 1600mAh battery and 6 minutes for 3000mAh battery.
I'm not going to do FPV, I want it for fun flying and filming.
As controller I'm usiing ArduPilot Mega 2.6 with case and Ublox Neo-6M GPS with compass. I have one PDB in list. I forgot bullet connectors, thanks. To mount the controller, the frame already have antivibration mount and I have bunch of nuts and bolts and I have shop with this near, so if I will missing some, I can buy them there.

Jackson said:
I just looked at the motors, the prices are high. Four would cost you $87.56. Looking at BG I see this:
http://www.banggood.com/Emax-MT2204...ropeller-Esc-12A-set-For-QAV250-p-974387.html
4 motors + 4 ESC + 4 CF props @ $77.81 with free shipping.
Click to expand...

I don't want to buy things on banggood, I'l rather shop on eBay.
Is it okay to use these motors: http://www.ebay.com/itm/EMAX-MT2204-2300kv-Multi-Copter-Motor-2-Pcs-1-X-CW-1-x-CCW-/111722474563 (I think the same as before, only for better price
with these props: http://www.ebay.com/itm/4-Pairs-6x3...-CW-CCW-for-QAV250-250-280-Quad-/111670859405 ?
ESC I will buy some with SimonK firmware (I've read they are better ( or not? ))

Thanks everybody for your advices.
 
H

HDtallrider

Well-Known Member
The 15a draw you plugged into ecalc is the motors running at 100% for the entire flight. You are more likely to operate at a third of that for the flight. Your 3000 mah battery will probably give 20 + minute flight times if you're just cruising around and not flying aggressively. I thought you wanted 6 minute flight times and were going to race. Your motor/ prop combo is a match. Don't forget to balance the props. Get 20a ESC's. One of my favorites for low priced ESC's is ZTW Spider. They operate at a very fast 600hz, run cool, don't require additional programming as others do (plug and play) and are priced reasonably on ebay and other sites. Be careful of going too cheap. It will just cost you more in the long run.
 
P

parman

New Member
HDtallrider said:
The 15a draw you plugged into ecalc is the motors running at 100% for the entire flight. You are more likely to operate at a third of that for the flight. Your 3000 mah battery will probably give 20 + minute flight times if you're just cruising around and not flying aggressively. I thought you wanted 6 minute flight times and were going to race. Your motor/ prop combo is a match. Don't forget to balance the props. Get 20a ESC's. One of my favorites for low priced ESC's is ZTW Spider. They operate at a very fast 600hz, run cool, don't require additional programming as others do (plug and play) and are priced reasonably on ebay and other sites. Be careful of going too cheap. It will just cost you more in the long run.
Click to expand...

The calculator has "flying load" option. On 100% (15A per every motor) it says 2 minutes of flight, on normal (40%) it has 6 minutes. 20 minutes will be awesome, but I think it's impossible in this setup. When I said 5-6 minutes, I mean this is the time I expect, but it will be great, if it will be bigger.

And I think the 15A ESC are enought. The motors maximum load is 12A, so 15A ESC should be enough.
 
H

HDtallrider

Well-Known Member
I think you will be pleasantly surprised on flight time. Check out some of the online racing videos. These guys go flat out for 5 minutes on 1200mah batteries! Ecalc is great as a guide but is about as accurate as a weather forecast.:p The reason for going 20a on the esc is it will run cooler and is the same physical size as the 15a. It has a bit more circuitry so it weighs 1-2 grams more. Plus The safety margin in case a motor starts to act up and resistance increases you will have a better chance of landing instead of crashing. It is your quad, so it is your call.
 
GJH105775

GJH105775

Off and on
Moderator
parman said:
The calculator has "flying load" option. On 100% (15A per every motor) it says 2 minutes of flight, on normal (40%) it has 6 minutes. 20 minutes will be awesome, but I think it's impossible in this setup. When I said 5-6 minutes, I mean this is the time I expect, but it will be great, if it will be bigger.

And I think the 15A ESC are enought. The motors maximum load is 12A, so 15A ESC should be enough.
Click to expand...

The 15 amp ESCs are enough, as you won't draw at full long, you buy big so that you can cut down on head and energy waste through it 18amp would be pleanty and escalc does conservative estimates so your flight time should be a little longer.
 
GJH105775

GJH105775

Off and on
Moderator
HDtallrider said:
I think you will be pleasantly surprised on flight time. Check out some of the online racing videos. These guys go flat out for 5 minutes on 1200mah batteries! Ecalc is great as a guide but is about as accurate as a weather forecast.:p The reason for going 20a on the esc is it will run cooler and is the same physical size as the 15a. It has a bit more circuitry so it weighs 1-2 grams more. Plus The safety margin in case a motor starts to act up and resistance increases you will have a better chance of landing instead of crashing. It is your quad, so it is your call.
Click to expand...
Haha, we must have been typing at the same time.
 
H

HDtallrider

Well-Known Member
See what happens when you hang with old guys? We rub off on you. haha I have been told the second thing that goes is your mind. I don't remember the first......
 
P

parman

New Member
HDtallrider said:
I think you will be pleasantly surprised on flight time. Check out some of the online racing videos. These guys go flat out for 5 minutes on 1200mah batteries! Ecalc is great as a guide but is about as accurate as a weather forecast.:p The reason for going 20a on the esc is it will run cooler and is the same physical size as the 15a. It has a bit more circuitry so it weighs 1-2 grams more. Plus The safety margin in case a motor starts to act up and resistance increases you will have a better chance of landing instead of crashing. It is your quad, so it is your call.
Click to expand...
So how to calculate the real flight time? Propably the most accurate way is to flight it and measure time until it will fall down. But propably not the best way :D Another idea I have is to keep battery on ground and make short flight with long wires and ampermeter and then do some calculations.
My friend has almost the same quadcopter (only diferent pilot board and maybe motors, frame and battery and other is the same) and he has only 5 minutes timer for flying.
Even if I'm really new to quadcopters and you are experienced in it, as electic engineer, I much don't believe the battery will least as long, but I will see.

Thank you very much
 
GJH105775

GJH105775

Off and on
Moderator
parman said:
So how to calculate the real flight time? Propably the most accurate way is to flight it and measure time until it will fall down. But propably not the best way :D Another idea I have is to keep battery on ground and make short flight with long wires and ampermeter and then do some calculations.
My friend has almost the same quadcopter (only diferent pilot board and maybe motors, frame and battery and other is the same) and he has only 5 minutes timer for flying.
Even if I'm really new to quadcopters and you are experienced in it, as electic engineer, I much don't believe the battery will least as long, but I will see.

Thank you very much
Click to expand...
Measure amp draw for how much throttle you give it (with props) and the batteries are rated in amp hours, but flying it is the best way as different people fly differently (where you are from sea level and heat also makes a difference) I may get five minutes on a quad you get 10 minutes. While measuring amp draw I'd also measure thrust to get a better idea on many factors.


Remember that the battery's capacity is measured in mAh, so if you pulled 10 amps on a 10,000 mAh battery you would last for approximately 1 hour (more like 50 minutes or less due to voltage drop)
 
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H

HDtallrider

Well-Known Member
I know what you mean. Ask GJH105775. He is an electrical engineer as well and can tell you that reality doesn't often match the measurements. For example; I have a RTF Quannum Nova 360mm with add on FPV. AUW is 1150g with a 3s 3000mah battery. I regularly get 21-22 minutes flight time if I'm just cruising around. Another one: I scratch built out of spruce a 305mm quad with fpv and gps. Figure a 1.5a draw. I'll give you the parts list here and you ecalc it and see what you get.... KDE 2306 2050kv motors. KDE 20a esc's. 8x2.7 CF props. 2s1p 20c 5000mah battery. AUW is 665g. The last time I flew it I looked away and flew it into the side of a shed in the middle of a field. Pitiful piloting. When I went to turn off my Tx my OSD readout showed I had been flying for 28 minutes and a few seconds. I was not flying aggressively. I recycled the battery because the case was split so I don't know how much charge was still left. The low voltage alarm had not gone off. I bet ecalc says 10 minutes for flight time.:rolleyes:
 
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