I have been slowly catching up with bench testing since receiving my new thrust stand😊
For over a year now, I have been using the DYS 2208/7 2600 Kv motor in several of my park jets and have been enjoying it's power and versatility running a few different props on 3S. Through my recent period of bench and field testing motors, I have also been experimenting with the Multistar Viking 2208 2600 Kv quad racing motor. Here is a picture of the two motors side by side, the Viking motor on the left, the DYS motor on the right.
Some basic comparisons before talking about bench and field performance.
Weight - With all the mounting hardware and props, the DYS motor weighs 56 gr/2.0 oz, the Viking motor weighs 52 gr/1.8 oz;
Price - The DYS motor currently sells for $17.22 USD from Banggood, shipping is free. The Viking motor sells for $28.14 from HobbyKing and shipping is not free. Fortunately, I picked mine up on sale for $16.10, so that was a bonus😀
The DYS comes with connectors already attached, so it is ready to go out of the package. The Viking motor requires you have and can attach your own connectors.
Both accept the standard 16x19 mm bolt pattern "X" mount for installing in a park jet.
So how did they perform on the bench? You can find all the details here on my motor test spreadsheet, but I will discuss a few things below. I will compare the numbers for the Turnigy Plush 40A ESC, 6x4 APC gas prop and Gens Ace 2200 3S 45C battery (links to all of these are on the spreadsheet).
DYS 2208 2600
50% throttle - 11.6A/141W producing 485 gr/17.1 oz of thrust;
100% throttle - 28.4A/330.5W producing 915 gr/32.3 oz of thrust.
Multistar Viking 2208 2600
50% throttle - 13.5A/163.2W producing 570 gr/20.1 oz of thrust;
100% throttle - 31.9A/384.7W producing 960 gr/33.9 oz of thrust.
Both motors are equally as efficient (ie producing equal ratios of thrust to amps drawn) at 50% and 100% throttle.
So you can see a very significant increase in performance with the Viking motor.
So diving into the specs a bit deeper, the DYS motor I'm assuming has 7 turns of wire around each stator pole. It is a darker color than on the Viking (sorry, because of the motor construction of both, very hard to see in a picture) and does look like it might be very slightly thicker. The Viking motor seems to have a bit neater wire application around the stator arms, not that the DYS is sloppy, the Viking is just neater. The magnets are flat on the DYS motor, the air gap between the magnets is the same as the Viking, the gap between the stator and the magnets is noticeably larger on the DYS motor than the Viking. Bearings on both seem equally smooth.
The DYS motor is rated for 2-3S, shows a max amp rating of 43.1 using a 7x5 prop on 3S. Whenever I see the top amp rating pulled from a chart as the max amp rating, I get a little suspicious, the manufacturer should probably have a bit better idea than that I would think. It is also showing a max wattage of 478W which again they just pulled from their test table.
The Viking motor just seems a little better finished with tighter tolerances. The magnets are N50 which are fairly strong, the industry standard for higher end motors currently is N52 (higher the number, stronger the magnet) The magnets are curved and the tolerance between the stator and magnets is very tight. It has a top amp rating of 39.1 which seems like a strange number, it says it is rated for 4S and 630W which is a big increase in wattage over the DYS motor.
The Viking motor is definitely more of a racing motor which you would hope so for the price😏 If you look at the thrust numbers using the higher end HobbyWing Platinum PRO 40A ESC with the settings I found optimum for higher Kv motors, the thrust jumped to 1015 gr/35.8 oz, an increase of 45 gr of thrust over the Plush performance. With the DYS motor, it only jumped up to 935 gr/33.0 oz, an increase of only 20 gr of thrust over the Plush settings.
I suspect that the Viking motor is running much closer to it's rated Kv, perhaps the DYS motor not so much. I have run the DYS motor quite a bit with the Master Airscrew 6x4x3 prop and it handled that well, not as fast as the 6x4 APC gas prop, but gave a bit softer feel, almost like the throttle had a little bit of expo if you just wanted to cruise around.
So price does become a bit of an issue, it is worth a little less than 5% increase in performance for a 60+% increase in cost? I guess only the purchaser can decide. I have had some quality control issues with the DYS motors, 3 of 4 I purchased run about equal, one has very stiff bearings and runs about 20% less powerful than the other three.
The Viking motor seems much better made and did perform better on the bench and I think has a lot more potential for power with some experimentation with props, batteries and ESCs, plus it is rated to handle 4S. If you find it on sale like I did at cheaper than the DYS motor, it is definitely worth a try😀
So next up, time to put them in a plane and do a showdown at the field 😉
Park Jet noise...the "other" sound of freedom😎
Cheers,
Scott
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