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Old Nov 04, 2013, 01:20 PM
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Joined Nov 2013
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turnigy hal build help

I'm building my first quadrotor and need some help with parts selection. I am somewhat new to the pro side of RC. My first remote was 40mhz 3ch including switch and an odd brand sold in Japan called ko propo that I can't find any info about. I used it for an RC hovercraft made from scrap parts and batteries for my hs science project.

For this build I want to add a gimbal for a gopro and wireless camera + 9v minimum. Would like to fly my SLR but I don't think its possible with 4 rotors cheaply.

After playing around in the calculator for an hour....
Here are the parts I'm looking at:
Tunigy Hal 580mm
Multiwii pro
25-50c 2650mah 3s
D3530-14 1100kv
12x4.5 blades
Turnigy 9x remote

I think my equipment and payload minus motors and battery is about 2.2kg
Max amb temp 80F @ 2000ft

I don't know I either have too much weight or need bigger motors and battery. What do you think?
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Last edited by naps1saps; Nov 04, 2013 at 01:29 PM.
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Old Nov 04, 2013, 03:01 PM
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Joined Mar 2009
94 Posts
With the config posted above you will have about a 3-5 min flight.. Battery is too small, props are too big for that motor speed.

I fly a Turnigy HAL and here is what I use. I get about 10 min and all up weight (including battery) without camera is about 1700g. I get about 10 min of flight time.

Turnigy H.A.L. (Heavy Aerial Lift) Quadcopter Frame 585mm
Turnigy D2836/8 1100KV Brushless
10x4.7 Carbon mixed props (or 10x4.7 APC slowfly)
TURNIGY Plush 30amp Speed Controller
MultiWii PRO Flight Controller w/MTK GPS Module(running Bradwii)
Turnigy nano-tech 4500mah 3S 25~50C Lipo Pack
OrangeRx R615 Spektrum/JR DSM2 Compatible 6Ch 2.4Ghz Receiver

I have tried a few other props but always come back to the 10X4.7. The quad has tons of punch and hovers at just under 1/2 throttle. I would like a little longer flight while carrying my gopro so I have begun to upgrade the frame to loose some weight. Power board, carbon fiber arms ect.

I would start looking at reducing your payload size. Gonna have a tough time lifting that on cheap(er) components in a quad config.
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Old Nov 04, 2013, 04:31 PM
Tempus Fugit
United Kingdom, England, Royston
Joined Jul 2013
434 Posts
To check out your cnfiguration google ecacl and feed your data in it will tell you straight away all the information you need, you can then look at different options to improve your flight times, kinda test drive the configuration before you go buy anything.

S
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Old Nov 04, 2013, 10:20 PM
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Looks like my weight calculations were based on package weight not item weight xD
Total weight is a minimum 1125g + camera (100g-500g) + battery and motors

D2836-8 is a better match with 12x4.5 but even with a 6000 battery @ 55% for hover, I still only get 4-9 min of flight time.

After playing with motors and props for a while I just don't see any way to increase the flight time and thrust any further.
Any suggestions? Is this adequate for filming?
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Last edited by naps1saps; Nov 04, 2013 at 10:53 PM.
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Old Nov 04, 2013, 11:34 PM
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Joined Mar 2009
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One word.. OCTO

Its pretty tough to lift over 2kg with a quad for any length of time.

Or.. You could go for a bigger frame (carbon fiber), lower KV motors and larger props (like 15"). Its possible to hit 15 - 20 min over 2kg. Won't be cheap though. Look at the Turnigy Multistar high pole count pancake motors.
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Old Nov 05, 2013, 12:23 AM
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New Zealand, Canterbury, Christchurch
Joined Dec 2012
1,419 Posts
If you want to go the larger arms route, you can get the talon CF arms and they will fit and increase it out to about 760mm.

Weight stays about the same but with the longer arms you can put on bigger props.

If you want to stay with a quad, you need to be looking at 4S batteries (at least) and large props with slow motors.

A very quick setup on ecalc at 2.2kg AUW with a 6000mAh 4S battery and 14x4.5 props on a 550kv motor looks pretty good, hover at 46% and 14.5mins of hover
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Old Nov 06, 2013, 12:44 AM
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Joined Nov 2013
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Thanks I'll take a look at that. What motor did you select?
Anyone know what the distance is from the motor mount center to the dome edge?

4s seems to make everything more expensive. Batteries are almost double too. I'd like to see if I can get 10 min hover from a 3s system @ 1300g.
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Old Nov 06, 2013, 12:05 PM
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New Zealand, Canterbury, Christchurch
Joined Dec 2012
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That was with a Tiger motor, ecalc only has one 550kv tiger motor.

Getting 10mins at 1.3kg is easy on 3S. Mine is 1.5kg with only a single 3300mAh battery and I get damn near that, a 4000 or 5000mAh battery will easily get you 10 mins
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Old Nov 06, 2013, 02:57 PM
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Yup.. You want 10 min, look at what I posted above.. Mine is 1.7kg and I get 10 min with a 4500 Nanotech.
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Old Nov 06, 2013, 11:46 PM
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2.2kg is less than my AUW it's 1.3kg to 2.2kg + drive weight.
If I use the tiger mn3110-15 (780) w/ 12x4.5 I can get 10 min @ 45% and can drive well up to my max weight. The only big problem is that this motor costs about $60 each! Way out of my price range LOL!

I think I'm going to go with the D2836-8 (1100kv) 12x4.5 ranges 3-7.7 min on a 5000mah 3s @ 56% with 2.2kg AUW minimum. I'm a little concerned about max temp at 178F with 80F ambient. I guess I just have too much weight or something because I just can't find any good motor + prop combos even @ 14x4.5 or 14x7 using 4s that justifies spending double on a 4s battery and more on arm extensions just to get 1-2 more minutes of hover.
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Old Nov 07, 2013, 12:22 PM
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Yup 2.2 kg is pretty heavy.

You could look at the H.A.L in a Hexacopter (its double the cost on Hobbykings website though). It would give you 2 extra motors. That would be a fairly big bump to the lifting capacity. Another option is to throw away the top dome to save some weight. I haven't weighed mine but I'm guessing around 150grams (its pretty thick plastic).

As to the 2836-8.. At 1.7kg with a 3s they are just warm when I land and I do a fair amount of full throttle punches. If you are conservative with your throttle, heat shouldn't be an issue.
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Last edited by travellerw; Nov 07, 2013 at 12:33 PM.
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Old Nov 07, 2013, 12:49 PM
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Alright so I'll start with a quad with the motors above and when I'm looking to upgrade I'll buy the hex frame and 2 more motors. Should get me to 2.6kg with double battery 8min @61%
Or
18 min with triple battery and gopro @ 55%

Hopefully there is extra weight in my calculations and I won't need to upgrade xD

I've never used these kind of batteries, how long do they take to charge?
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Last edited by naps1saps; Nov 07, 2013 at 12:55 PM.
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Old Nov 07, 2013, 02:37 PM
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Oh that is a whole discussion on its own.. I suggest you go do a bunch of reading on LIPO batteries. They have pretty particular requirements. Its pretty easy to kill a LIPO by overcharging or discharging too far (unlike you cell phone there is no protection circuitry)

Make sure you get a good charger. I charge my LIPOs at 1C (so 5A for a 5000mah battery) to ensure longevity. It takes about an hour and a half. My batteries can be charged at 5C but I like to protect my stuff.... plus most chargers can only deliver about 5A.
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Old Nov 07, 2013, 03:04 PM
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I was going to get this charger
http://hobbyking.com/hobbyking/store..._DC_w_PSU.html

Also off topic, I noticed a 3 arm copter with dual props (upper and lower). If I had an upper and lower motor on the same arm, does this increase lift as much as the same number single props?
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Old Nov 07, 2013, 03:36 PM
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Spend a little more and get this one.. Built in power supply plus 12v port for the field. Its also a trusted charger.
http://hobbyking.com/hobbyking/store..._GENUINE_.html

Sorry I can't help with the multimotor config.. I know nothing about that.
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