New aftermarket motor for the Atom 500 - possibly

[brian94066]

Scorpion 4015-1070kv

http://www.readyheli.com/MIK4465-Sco...E_p_38416.html

could get good, who knows

[TheBum]

You couldn't use any of the Compass pinions on it: it only has a 5mm shaft. The 500 and 6HV stock motors both have 6mm shafts.

[arcweld]

One of the reasons I love Compass is you just don't need aftermarket motors etc.
Sure it's fun to play around but for power and efficiency the compass motors just can't be beat.
I'm starting to notice a few Compass motors appearing in other brand machines too.

[crawl]

Originally Posted by arcweld

One of the reasons I love Compass is you just don't need aftermarket motors etc.
Sure it's fun to play around but for power and efficiency the compass motors just can't be beat.
I'm starting to notice a few Compass motors appearing in other brand machines too.

Ditto. I have seen the 6hv in a bunch of Fusion 50's, and even in a few Trex 700's lol.

[Ghostrider267]

isn't the 500 motor a 5mm shaft?
At least all the atom 500 motors that I have are 5mm....

[TheBum]

Originally Posted by Ghostrider267

isn't the 500 motor a 5mm shaft?
At least all the atom 500 motors that I have are 5mm....

Not unless the 1050Kv motor went to 5mm, which I have a hard time believing. My 1080Kv motor is definitely 6mm.

[Jimmy!]

*Just checked w/ calipers

The main part of the shaft (measured at the bottom of the can) is 6mm, but reduces to 5mm. The pinions have a 5mm bore.
At least this is the case on my 2 Atom motors and 3 pinions.

[TheBum]

Originally Posted by Jimmy!

*Just checked w/ calipers

The main part of the shaft (measured at the bottom of the can) is 6mm, but reduces to 5mm. The pinions have a 5mm bore.
At least this is the case on my 2 Atom motors and 3 pinions.

I guess I just never measured outside the motor. I know the motors take 6mm ID bearings and a 6mm snap ring.

[Ghostrider267]

I have the scorpion 4020 1100 motor in my atom now. This and the stock atom motor are very close as far as power goes. But the atom motor has a liitle more torque if you ask me. I will say that the scorpion motor is much more quiet in flight. They are both 5mm shaft so you can just switch the pinion right over.

[Ghostrider267]

also if your want to take the time, you can get the 4025 1100 motor and change the mainshaft from a 6mm to a 5mm. it's pretty easy and they sell just the shaft too. the 4025 1100 has more power than the 4020 1100 and it's the same size so it will fit in the atom frame.
just a thought.....

Rob

[skunkworx]

I've never found the motor to be the weak link, rather the packs. If you are seeing a lag in instantaneous power, try going with a smaller, higher C pack. The Compass motors produce nothing but INSANE amounts of power! If it's not snappy enough for you, up your pinion a tooth or two and I guarantee even the most fearless of pilots will get their heart racing with any machine powered by one these monsters. They produce tons of torque so you can load them down a lot more without bogging unlike with the Scorps (I've never had good results with Scorpion motors). Even flying in comparison with a Neu motor, the Compass motors keep neck-and-neck. Pretty tough to beat that.

[jchen]

+1 Skunkworx but if you factor inn the cost of good high C batts, it might
be cheaper to buy a Pyro or go 8S

[crawl]

Originally Posted by jchen

+1 Skunkworx but if you factor inn the cost of good high C batts, it might
be cheaper to buy a Pyro or go 8S

low C packs won't work any better on a Scorpion/Pyro. If anything it's going to work worse as those motors are going to EAT your packs.

Likewise with 8s if you continue to use low C packs you are just going to add weight and gain very little power. It will be a wash in the end but your machine will fly heavier.

[skunkworx]

Originally Posted by jchen

+1 Skunkworx but if you factor inn the cost of good high C batts, it might
be cheaper to buy a Pyro or go 8S

The higher the cell count you go, the less C you need to back it up. Running at the same power level, 8S VS 12S you will pull about 25% less amps in the same maneuver. If you did all the math, you could easily get away with doing only 25C packs and have equivalent or better power than 30C to 50C packs on 6S and 8S. If you wanted totally insane power, you could go high C on HV and it would fly a lot more like the 6HV.

[jchen]

Hi Skunkworx,

Totally agree with you.

[Ivamos]

Hi guys!
I accept, that the Compass motor is powerfull, but the quality of used materials is not really good.
I killed two Motors in normal use. A lot of power means high forces on the shaft. But this shaft is not hard enough and its in only two relativelly small bearings.
Just see how it looks under the top bearing. Even the small imbuss screw in Pinion did make visible trace on it. Shaft on my new (1050kV) Motor looks now exactly the some as a shaft in "old" 1070kV Motor. Both are no more usable, and there ist no options to change only the shafts. Bearings are still top!
I do not want to buy a new motor every half year - even if its powerfull and relativelly cheap.
So i use Scorpion HK4025-1100 now. Overall quality is uncomparable better as in this "new one" Compass Motor. Mikado in Germany sell it with 5mm Shaft End for 89 Euro including VAT.

[sly the dogman]

Simple question ?

Isn't the HK4025-100 for the 600
and the HK3026-1400 for the 500.

For a 5.5 which is more suitable,
just curious.

[Ivamos]

We are flying Atoms - not Trexx.
4025 fits and performs very well. I did try a very expensive Hacker A40 10L Turbine - but this has terrible sound and runs very hot. Not the deal for me.

[crawl]

Originally Posted by Ivamos

We are flying Atoms - not Trexx.
4025 fits and performs very well. I did try a very expensive Hacker A40 10L Turbine - but this has terrible sound and runs very hot. Not the deal for me.

I have to admit that is sexy looking haha.

How is the power on the 1100kv Scorpion Vs the stock Atom motor?

How about heat (battery/motor)?

Flight time?

What ESC are you running? I see the 4025 is rated for 100a continuous, most are running ~60-70a ESC's with this heli.

If anything I would think the new scorpion motor made for the 400SE would be ideal replacement. Weighs 121g less but still rated for 1900w (vs 2200w for the 4025).

http://www.readyheli.com/MIK4465-Sco...E_p_38416.html

[sly the dogman]

I do not want to get a Scorpion for my 5.5,
it was just "a simple question"