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Dec 21, 2012, 11:20 AM
"The Judge"
sebbe's Avatar
Thread OP
Discussion

Turnigy Aerodrive SK3 OR NTM Prop Drive Series OR easy match series


Hi, which of the

NTM Prop Drive Series
or
Turnigy Aerodrive SK3
or
Turnigy G25

is better, in terms of power, quality, wellbalanced..

I was thinking of the 35-48 sized ones..


4-5s lipo, 9" prop for my Gee Bee R2..

This are the three I was thinking off:

* https://www.hobbyking.com/hobbyking/s...ner_Motor.html

* https://www.hobbyking.com/hobbyking/s...00KV_815W.html

* https://www.hobbyking.com/hobbyking/s...er_870kv_.html
Last edited by sebbe; Dec 21, 2012 at 11:28 AM.
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Dec 22, 2012, 04:46 AM
"The Judge"
sebbe's Avatar
Thread OP
Ok. No answer. If i ask it like this instead. Has anyone tried any of the motors above? Good, bad
Dec 22, 2012, 09:08 AM
Registered User
flypaper 2's Avatar
All of the motors above swing fairly large props, 11 to 14 in. You need to go to motors with higher KV to use the smaller props on the same motors. More details on your plane would help too. Size, weight and purpose, to tailor it for your use. For a GeeBee type racer, this one with the higher kv swinging a smaller prop should give you the speed performance. Too many choices

https://www.hobbyking.com/hobbyking/s...ner_Motor.html
Last edited by flypaper 2; Dec 22, 2012 at 09:15 AM.
Dec 22, 2012, 10:35 AM
"The Judge"
sebbe's Avatar
Thread OP
Well. I dont think i need much more kv. 5s lipo with a 9" prop is far to much on a 1400kv... i have a 987kv hyperion motor o with a 9x9 prop on my pogo with 5s lipo. It draws 85 amps. So my guess is a bit lower kv with same prop and 5s lipo should be around 75 amps where i want to be. Maybee even go to 8x8 prop to lower the amps.. it is the gee bee 25 from hk.. i just wanted some opinion about my motors above. The rest i have in control
Dec 22, 2012, 01:03 PM
B12
B12
Registered User
Quote:
Originally Posted by sebbe
Hi, which of the

NTM Prop Drive Series
or
Turnigy Aerodrive SK3
or
Turnigy G25

is better, in terms of power, quality, wellbalanced..

I was thinking of the 35-48 sized ones..

None, this is
https://www.hobbyking.com/hobbyking/s...tor_850kv.html
Dec 22, 2012, 04:28 PM
Registered User
Quote:
Originally Posted by B12
that is rated at only 2-3s
Dec 22, 2012, 04:29 PM
Registered User
Quote:
Originally Posted by sebbe
Ok. No answer. If i ask it like this instead. Has anyone tried any of the motors above? Good, bad
I was running the G25 870 on the P51 mustang from Nitroplanes for awhile on 4s. Loved it. No complaints
Dec 22, 2012, 04:49 PM
Registered User
http://www.horizonhobby.com/products...50kv-EFLM4025B

This on 4s w/ a 8x8-9x9 would be fast and right where you want to be A wise. I was running this setup as well on PZ P47. The 8x8 was drawing around 58A and the 9x9, around 70A, both with 4s 2200 40c packs

none of the motors in the 1st post are even rated for 5s voltage
Dec 22, 2012, 04:54 PM
Registered User
All of the above aside. Getting 75A from any of these motors above is going past extreme. They are only rated in the 51-58 range. Yes you can go past that in short bursts with adequate breaks for cooling, but you would not be able to stay there the whole flight. The motor would need to be cooled properly, possibly needing mods to the plane to allow more airflow.
Dec 23, 2012, 07:31 AM
B12
B12
Registered User
Quote:
Originally Posted by erikc641
that is rated at only 2-3s
It is rated for 3-6s really. It is an error in Hobbyking specs which is not that unusual. It is the best performing HK outrunner in it's size. Internal resistance is about half of all the rest. 0.0185ohm

I have run it up to 75A in glider climbs but I would not run any of these 3548 outrunners more than 50A continuous.
Dec 23, 2012, 03:33 PM
"The Judge"
sebbe's Avatar
Thread OP
thanks guys, well running the motor in the Gee Bee R2 will give it massive cooling, so bursts will be no problem up to 70 amps I think... the only problem with the :
https://www.hobbyking.com/hobbyking/s...tor_850kv.html

is I have to move the shaft to stick out the other side, NOT the best job on lowcost motors from HK, very risky, and even if you get the shaft the other side, you often have to make some other stuff to the shaft to make it safe, to much job and risky..

Some shafts are unable to move also..

I think the G25 will do the job, it will take 5s in burtses, I can also go down to 8x8 making it safer for the motor.. Thanks for your input..

The E-flite motor is nice, but costs to much for this project..

Sebbe


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