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Old 07-28-2015, 06:13 AM   #1 (permalink)
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Default 700 on 6s with 560kv motor question

Hi guys
I am looking at building a 700 (no scale body as yet) but like the way scale flys

At the moment have a basic 700 frame and boom with a 560 kv motor and would like to run this on 6s to get more flight time and save on batteries

Not sure what ESC to run as my electrical knowledge is a little poor

I am using a hobbywing 100amp hv in my 550 that has a great BEC and was wondering if I could use the same in this settup

Thanks for any advise
Watho
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Old 07-29-2015, 04:41 AM   #2 (permalink)
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RPM = 560kV x 22.2V x 0.9 x 12T / 112T = 1199rpm at 100% towards the end of a flight.

This is probably too slow unless you can get different gears (I have assumed because you did not state what the gearing is).

For a 2x 700mm scale heli (you also didn't say if it was 2, 3, 4 or more blades) you would want to run around 1300-1350rpm at a governed 90-95%, so you would want to get at least 1400rpm using the above calculation.

I don't know why you don't stick with 12s (although then you would need a slower motor) - I get 2 x 6 minute flights on a pair of 5000mAh 6s in 12s on my Vario Long Ranger.

6s will run higher amps, which may mean more heat ? Probably around 50-60A for scale flying, so your 100A LV ESC would be OK, although I would definitely not run a heavy 700 sized heli on an internal ESC BEC (other than maybe a high end Kontroniks ESC).

A CC Edge or Edge HV may be a better option because it has a nice soft start, data logging, a big heat sink, and you can tame down the settings to suit scale flying.

Colin
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Old 07-29-2015, 05:01 AM   #3 (permalink)
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Thanks for the reply Colin
Have seen a couple of vids on the 700 using 6s and they where getting 8-9 mins flight times
I also enjoy the slower scale type flying

Tha esc is the hobbywing 100amp HV ,so the internal Bec is very good, it also comes with a fan

Still not sure of the gearing as these are the things I have to work on, also just spinning 2 blades so nothing Fancy as yet

Thanks again for your input
Watho
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Old 07-29-2015, 09:05 AM   #4 (permalink)
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Hi:

As a pod and boom helicopter, the speed that Colin has given you will certainly fly the helicopter at a very sedate rate. Your collective management will need to be a bit better than normal as your power is going to be a lot lower. I have run a 600EFL Pro on a single 6s battery, using the stock 510kv motor, 13t pinion, and 112t main. I thoroughly enjoyed flying it at the lower speed but there is a drawback and that is you will most likely only get a minute or two longer than normal flying and make sure you set the battery cut-off for the 6s LiPo. Your choice of ESC for this purpose should be more than enough to get the job done but if you are looking to eventually go to scale, then think about a 120A ESC so you only buy once. Hope this helps.

Don
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Old 07-30-2015, 04:13 AM   #5 (permalink)
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Quote:
Originally Posted by watho 46 View Post
Thanks for the reply Colin
Have seen a couple of vids on the 700 using 6s and they where getting 8-9 mins flight times
Watho
When I was flying my Long ranger in basic form without cockpit etc, and it was lighter, I was getting 2x 8 minute flights on around 3200-3400mAh (into each 5000mAh 6s), so I guess I could have pushed it to 2x 9 minute flights. I would guess that this heli would have been heavier than a similar sized pod and boom, so 2x 10 minute flights with a 12s setup (2x 5000mAh) should not be too hard at all.

My Long Ranger currently weighs 19lbs and uses 300mAh per minute, so 13 minutes on a pair of 5000mAh (discharged to 80%).

I have no experience flying a big heli on 6s, so I cannot comment on how long the flights would be. You would need higher C rated lipos than a 12s setup, which adds cost and some weight, probably for no real increase in flight times.

Colin
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Old 07-30-2015, 05:20 AM   #6 (permalink)
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Thanks guys
Really appreciate your comments

I still have some to learn in this hobby and should do a lot more on the electronics side, but my head will only hold so much lol

Thanks again to all you guys on HF for all your input

Will go back to the bench and work out what I will do with this bird

Cheers and thanks again
Watho
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