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Andy7:
19 Aug 2019 09:14:20
Good for you!  ~~
DarkButterfly:
18 Aug 2019 19:13:57
Had another negative encounter, it's been a few years since the last one, just an uneducated ******, going on about drones being illegal yada yada yada.    :-/
Still that didn't spoil my flying time, had an absolute blast  ~~
Gaza07:
07 Aug 2019 19:52:01
ooooh mrs jones  :D
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30 Jul 2019 15:26:34
D.B. you tightwad.. :cool:
atomiclama:
29 Jul 2019 20:14:10
DB that just means you have shed loads of props in the first place ;-)
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29 Jul 2019 18:53:33
Just had a thought, even with all the crashing I've done, I haven't bought any replacement props in over a year ~~
ched:
09 Jul 2019 19:45:42
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09 Jul 2019 18:10:30
Hope you all have a great day  :beer2:
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09 Jul 2019 14:05:28
BFU#8 details locked in for this saturday - see the head of the forum thread for all details.
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05 Jul 2019 21:51:05
Good for genital warts as well......or so I'm told.. :hmm
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Printing 3d Forum

Motor Upgrading advice

Started by powerlord, Thursday,September 19, 2013, 08:40:05

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powerlord

Since nearly none of the actual motors folk seem to use are in the ecalc thing, and hardly any manufacturer seems to provided the data it needs to enter it all manually I can';t really make any progress here :-(

I have a DJI450. standard 30a OP ESCs.

I have EMAX MULTI COPTER MOTOR 2212-920Kvs.

NAZA controller, and fly it in GPS mode always.

And I run it with 4s packs (mostly zippy compact 3700 jobs).

I run graupner 10x5s
All up weight is about 1500kg.

I get about 7 minutes flight time in reality before low battery flashes (and confirmed from recharging that I';ve done 2800 or so of capacity which is about all I';d want to pull out pack) - 90% of this in hover as it';s an aerial photography platform really.

It';s fine, but after a full flight, motors are hot to touch (not roasting,  but probably about 50-60).

It started a lot lighter of course, before everything else just stuffed onto it - originally it ran on 11x5 graupners and motors ran cool - but its too ';fat'; for those now... and even with the most efficient props for the weight its putting a sweat on :-)

I';ve flown it with a wattmeter - doing same flight again and again with different props, and these ones are the lowest watts used:

11x5
10x7
10x4.7 slowfly
9x5 carbon eprop
8x4.7 slowfly.

So for what I have just now, I think that I am at right prop size, etc (even though emax says use 8s with 4s, etc like DJI does).

However, ideally I';d like to have motors that ain';t hot on landing. Plus would a lower kv motor be more efficient for the type of flying I am doing ?

stu

callaghan48

Hi,
I found that torxpower 2216 800kv are a great upgrade, on 10x5 E-props my F550 with a takeoff weight of 2820g on 4s 5000 gets around 13 mins using 4000 are cold to touch on landing, On my Disco with same motor';s that is on flee-bay at the moment 10x5 E-pros 4s 4500 loaded with FPV gear & Aee action cam, heli landing gear takeoff weight 1900g around 12mins,
John.

flybywire

Just spent 5 mins composing a post & it dissapeared into the ether!   How annoying.

Powerlord, I have a very similar setup to you, I';m using these 2215 turnigy motors http://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=37204 (& 25a Turnigy red esc';s), and they only appear to get warm after a full flight.  I use 2 sizes of lipo, both 4 cell, 3300 & 5000.  The 5000';s have more grunt than the 3300';s, but actually flight times don';t differ massively.  Before adding my brushless gimbal, fligt times were:
5000 mAh 15 mins (75-80% discharge)
3300 mAh 12 mins (75-80% discharge)

After gimabal addition, you can knock 3 mins of flight times, or thereabouts with a safety margin.
In practical terms, I keep an eye on voltage levels, and never let my cell v drop below 3.5v, and you certanly wouldn';t let it go below 3.2 or you';d be a bad boy!
When it get';s to that level I';m always back within spitting distance. so no danger.  My motors & esc are nicely ';warm';, although I had 1 motor & 1 esc that got ';hot'; when I first built the thing, so decided to replace them to be on the safe side.
Don';t know the AUW off top of head, but will post it later 2day.
I also have the ezosd & set of 4 dji landing legs.
Hope this helps?
:smiley:
Blog: http://ajwillis303.wix.com/stuff
The spiritual home of fpv large
Keep it emax, capiche?
Hardware? sure, I got hardware!

dp106

Watching with interest as I';m having similar thoughts at the moment.  I have an SK450 Deadcat which I';m using for FPV.  Not sure what the AUW is but with FPV gear, gopro and 3700 3s battery I doubt its particularly light.  I have 2830 1000kv motors with 9x4.7 props at the moment.

I';m wondering if these would be a better option http://www.unmannedtechshop.co.uk/rc-gear/bl-motor-esc/brushless-motor-3506q-530kv-high-efficiency.html along with larger props.  I think the theory being the lower kv motors draw less current for the same amount of thrust?

I think the downside of these would be it less acrobatic but as I';ve not had the guts to even attempt a flip dont think that would be an issue.

flybywire

Quote from: dp106 on Thursday,September 19, 2013, 13:19:14
Watching with interest as I';m having similar thoughts at the moment.  I have an SK450 Deadcat which I';m using for FPV.  Not sure what the AUW is but with FPV gear, gopro and 3700 3s battery I doubt its particularly light.  I have 2830 1000kv motors with 9x4.7 props at the moment.

I';m wondering if these would be a better option http://www.unmannedtechshop.co.uk/rc-gear/bl-motor-esc/brushless-motor-3506q-530kv-high-efficiency.html along with larger props.  I think the theory being the lower kv motors draw less current for the same amount of thrust?

I think the downside of these would be it less acrobatic but as I';ve not had the guts to even attempt a flip dont think that would be an issue.


THey look pretty meaty.  I would consider 4 cell';s with those, maybe 11 or 12" props, if you have the clearance.  Have you checked ot HK';s range(s) of motors, they have similar spec to this half the price, just a thought.
Blog: http://ajwillis303.wix.com/stuff
The spiritual home of fpv large
Keep it emax, capiche?
Hardware? sure, I got hardware!

powerlord

Well if  ordered 4 turnings flybywire.  So if they';re rubbish I';m blaming you!  :-P

Sent from my HTC One using Tapatalk 4


flybywire

Quote from: powerlord on Thursday,September 19, 2013, 18:40:18
Well if  ordered 4 turnings flybywire.  So if they';re rubbish I';m blaming you!  :-P

Sent from my HTC One using Tapatalk 4


Knew you were going to say that.  Reputation on the line here (what reputation?)
They work for me mate, all i can say.    :crossfingers:

Edit: do order a spare.
Blog: http://ajwillis303.wix.com/stuff
The spiritual home of fpv large
Keep it emax, capiche?
Hardware? sure, I got hardware!

powerlord

Ah.  Spare would have been a good idea,  but usually I order my spares once I decide summit is good - otherwise the hoose would be full of even more useless crap!!!  O:-)

Sent from my HTC One using Tapatalk 4