Scorpion 4020-1100kv motor

[dunkonu23]

Well, I installed my Scorpion 4020-1100kv motor today. I got this motor instead of the one Nexgen got because I wanted to compare apples to apples. I fully believe the 910kv motor is a beast. My goal was to find out which of 1100kv motors suited me best.



First, two issues: The motor doesn't fit too well in Ben's Easy Mesh Motor Mount. The motor is about 1/4 or 5/8" wider than my TonicX Z30A. As such, I had to grind small indentations in the base of the motor in order to get it so I could get a straight shot for the pivot and adjusting screws of the mount. Second, because of the width of the motor and the way it fits on the mount, it's not that easy to get a good gear mesh. You end up tightening the bolts with round end allen wrenches because you don't get a straight shot at the screws. Lack of a straight shot cause unwanted torque and can cause the mount to slip. It sliped on me a few times. In fact, I didn't get a great mesh until my second flight.



I'm throwing out the first flight because of the gear mesh.



I tested with Mavrikk G5 Pro 550 blades. I'll test again with Edge 553 Flybar blades, soon.



Second flight was three minutes of full collective punch outs to about 80 feet or so and full down collective trips back. The motor has more pop with my setup than a TonicXZ30. It's also slightly more efficient. In three minutes I took out 1162 mAh from a 3300mAh Hyperion VX 35C 6S battery; yielding a total projected flight time of 6:49 versus 6:20 seconds with the TonicX Z30A using the 80 percent rule. Be mindful that I only used one battery today, so I will repeat this test with my other identical batteries to get an actual flight time. I suspect it will be about 6:35 or so given the data I have on my batteries.



I'll post more later (read tomorrow) with pictures of the area I had to grind. I'll also tach the machine in my Idle 2 setting. I suspect it' has a slightly higher head speed with my 14/20/50/61 gearing.



So far, so good. After the second flight, the motor came back warm with the pack only being slightly warmer than ambient.



Scott

[Jerrymac]

Looking forward to your review on that motor after a few more flights. Heck, I am still using the stock Gaui 850kv motor and was thinking of upgrading some day to the Z30, but........?

[dunkonu23]

From the looks of things weatherwise, I'm not going to be able to test in the AM. I will be able to post a graph of the second flight and pictures of the ground area, though. It's supposed to rain its tail off here all day so, Wednesday might be the earliest for multiple pack testing.

The TonicX is still an outstanding choice for this helicopter. It's a great motor. I've got over 50 flights on mine without a hiccup. That says a lot considering I had a Hyperion motor burn up in flight testing it!

Scott

[dunkonu23]

Here are the pictures and the flight log. In looking at the adjusting side, it may appear griding wasn't necessary. It probably wasn't, but what's done is done. Grinding on the fixed side was definitely necessary to get a straight shot. I had to put the screw in with the motor mounting plate not attached to the motor. Once the mounting plate was attached, it was a simple task to finger tighten the fixed side screw until it was about half way in. From there, I used a round tipped allen wrench to finish tightening the screw.









My throttle curve for this was 93.5 flat in idle 2. I am going to increase that for the next session to 100 flat and see what it gets. Additionally, based on what I've read about Scorpion motors, they like PWM 8, so that's what it is now. During this test, it was in Outrunner mode.

Unfortunately, it's raining right now, so the next session will be tomorrow, weather permitting.

Scott

[Jerrymac]

I wonder if that motor would fit in the plastic frame Hurri. I am still going to build another one some day from parts/pieces, just because I enjoy building them, but don't know which motor to run in it. Not positive, but I think Nexgen has the Gaui CF frame.

So far, I am happy with the Z20 in the 425, and thought about a Z30 for the new build. Hard to choose sometime, and sometime not, as I remember your experience with the Hyperion motor was not a good one.

Scorpion motors have been around for quite a while now, so they should know how to build a good one,lol.

[dunkonu23]

May 18, 2010 0:42:49 GMT -5 Jerrymac said:

I wonder if that motor would fit in the plastic frame Hurri. I am still going to build another one some day from parts/pieces, just because I enjoy building them, but don't know which motor to run in it. Not positive, but I think Nexgen has the Gaui CF frame.

So far, I am happy with the Z20 in the 425, and thought about a Z30 for the new build. Hard to choose sometime, and sometime not, as I remember your experience with the Hyperion motor was not a good one.

Scorpion motors have been around for quite a while now, so they should know how to build a good one,lol.

I dunno... it probably would fit, but like Nexgen, you'll probably have to extend the aileron and elevator bell cranks a bit.

Oh... the graph above is corrupt...

But... the motor is performing very well... 10 flights on it and it's going strong. Today, in a three minute hard up hard down pitch pump session , the motor came down at 107 degrees F and the battery came down at 84 degrees F. (I found my temp gun!)

Scott

[Jerrymac]

I thought that graph looked a little strange, but didn't question it as I thought I might be reading it wrong. Looked like the amp draw was really low for that size motor.

I was thinking if I use a 60T main, then get a proper pinion ( haven't calculated it yet ) it might set the motor forward farther away from the arms, I dunno. Of course, the plastic frame may not be up to the task of the extra power either, as I am sure that it is not nearly as strong as your HH frame.