a little help with 680 motors

[kugabooga]

Hi folks,

Decided to join the ranks of the 680pro camera ship brigade.

I';m ready to pull the trigger on all the parts that I don';t have already.

Quick run down of completed set-up:

680pro frame
apm
3dr telemetry
Vtx
FrSky x8r
afro 30a
tarot gimbal v2
SJ4000
13x4props
and 3s in parallel to start with .

spent hours on eCalc and just fried my head .

anyhoo , im torn on motor choice to the point of distraction , its driving me nuts   

my choices are, in no particular order:

Emax MT 3506 650Kv in UK @ £23.50 a pop ---- www.radioc.co.uk
Emax MT 3510 600Kv in UK @ £25.00 a pop ---  www.radioc.co.uk
Multistar Elite 4006 740Kv     @ £22.60 a pop HK international warehouse

Taking shipping into account there';s not much in it ,but may get stung for import duty with HK.

thanks for taking time to read  ::)

all advice greatly appreciated

Cheers 

Gaz

[jimbo385]

I';m building a very similar setup but I';ve gone for the Tarot motors as they were built for the frame! Esc';s are 40Amp and 4s setup for my Pixhawk clone. Batteries will be 5000 mah.

Good luck.

[kugabooga]

I';m building a very similar setup but I';ve gone for the Tarot motors as they were built for the frame!

Hi Jimbo ,
These motors were my original choice due to price and Kv . but after reading up on here and RCgroups it was evident that the motors were not happy and even self destructive on 4S , it seems the data from tarot is a little exaggerated.

They seem to work fine on 3s but overheat tremendously on 4S, as i plan on using 4S eventually i have decided to overlook these motors .

Not a huge thread but makes interesting reading,

http://www.rcgroups.com/forums/showthread.php?t=2151596

also mentioned here:
http://www.multi-rotor.co.uk/index.php?topic=8622.msg71819#msg71819


cheers

Gaz

[jimbo385]

Ok,
A friend of mine has 4s on the Tarot motors and no issues.

I will check them out and if they do get too hot then they';re outa here!

Cheers.

[mpd79]

I have a 680Pro with the Emax 3510 - fly';s really well on 4s. I use CF 1355';s and  F30a';s flashed with SimonK, touch wood I have never had an issue 

BTW: I got them from RadioCC, turned up really quick and when I bought mine there was little in the price from oversea';s.

[kugabooga]

Thanks mpd79
Can I trouble you for your battery and flight time info ?
Gimbal ?

Cheers
Gaz

[mpd79]

Its a bit of a fat boy, FT is about 15mins - that said I haven';t actually kept it up till the packs are empty.  I have a cheap servo gimbal fitted as my brush less packed up! I love the frame, fitted the Tarrot landing gear too which is a bargain at £20 - If nothing else it looks impressive!

Cheers, Mike

[Cloudbuster]

Emax 3510 everytime !! You will need to run on 4s batts though !!! The 3510 on 3s will be underpowered and pretty whooley on the controls... The3510';s will run on forever on the 680 and will carry a good 1kg payload using 1255 props...and return about ten mins flight time from a single 5000 mah lipo... Hobbyking sell a hardcase 5000 20c batt for 16 quid which is so cheeeaap !!! I have built a slack handful of these now and the above are my preffered choice along with DYS 30amp esc this is such a reliable platform...

Regards rob

[Dr Phibes]

Seems I';m in the same club here, just getting to the end of my 680 pro build and looking forward to first flight tests (when it gets a bit warmer!). My power train config is: APM (HKPilotMega); Emax MT3510; ZTW 30a Spider ';Optos';; 4s Multistar 8000ma.(I';m think of running two in parallel giving 16000ma but with extra weight eCalc suggests the trade off for extra flight time would not be that favourable).
Running eCalc a multitude of ways best results seems to suggest 13 or 14 inch props (on 4s) but latter won';t of course fit without mods. I will start by trialling Tarot 1255 carbons and Gemfan 1347 composits. From what I can ascertain, and what other suggest too, I wouldn';t run these motors on this airframe with 3s - it will run no doubt but efficiency drops through the floor.

Presently I got AUW at around 2.8kg including both batteries (main, as above, and 1000ma to run camera and FPV gear later) which I';m quite happy with.
Motor testing I got a real world average of 230w, 15.5a (full throttle) and 51w, 3.2a (50% throttle) running the 1255 carbon props, which seems to me quite respectable and not too far off Emax';s claim numbers.
They seem fairly well balanced out the box though all of mine did need further balancing (not out by a great deal). The motor wires, it should be noted, are bare and bullets are not supplied.

So I have been impressed by these motors (build quality, performance) so far but, of course, the pudding is in the eating and I have yet to put them in the air!
I got mine from RadioC too, very quick delivery, and worth the little extra you pay I think for quick delivery and knowing that if you do get a dud these guys are not half way round the planet for returns/replacement.
Just my two pence worth, hope this helps.

[Friskle]

Emax 3510 everytime !! You will need to run on 4s batts though !!! The 3510 on 3s will be underpowered and pretty whooley on the controls... The3510';s will run on forever on the 680 and will carry a good 1kg payload using 1255 props...and return about ten mins flight time from a single 5000 mah lipo... Hobbyking sell a hardcase 5000 20c batt for 16 quid which is so cheeeaap !!! I have built a slack handful of these now and the above are my preffered choice along with DYS 30amp esc this is such a reliable platform...

Regards rob

How do the 20C Hardcase batts run ? was wondering about trying them on the WKM 550 frame Quad.

[Paulham]

How do the 20C Hardcase batts run ? was wondering about trying them on the WKM 550 frame Quad.

awful... dont waste your money.

I ordered 4, 1 turned up with a dead cell (spent hours and hours trying to charge up) and another has a weak one which drops voltage really quickly. The other 2 i have no idea about as i stopped using them for this reason.

[Friskle]

Cheers for your opinion on them Paul, everything taken into consideration :)