Initial impressions and bench testing of the Brother Hobby EngineerX 2307 2700 kv motor

Hi Everyone -

I recently completed a bench test session of another quad racing motor I picked up to evaluate, the BrotherHobby EngineerX 2307 2700 kv that I picked up from Banggood.  I picked mine up for $23.99 USD, I notice the regular price from Banggood is $30.67, although at the time of writing this blog post it is on sale for the same price I paid.

I discovered this motor watching EngineerX's YouTube channel, here is his test video of this motor before it was released to the public.

I was very pleased to be able to exchange a few words with him about this new motor.  He mentioned that it might not be for all out speed, but perhaps very good torque.  If you want more details about the "guts" of the motor, please watch his video as he takes it apart and shows the details of the motor.

Mine weighed 34 gr/1.2 oz out of the box, it comes with the standard bolts and a prop nut, the finish is very nice and it spins very smoothly.

With the prop and other hardware attached ready to go in the plane, it weighs 48 gr/1.7 oz which I think is very good for a 2307 motor, it is right there with all the 2306 size motors I have tested thus far.

I started off the bench testing with the 6x4 APC gas prop, you can read all the test numbers on the motor test spreadsheet which also has links to all the components used in the testing.  The thrust numbers were not that great, but the amps numbers were noticeably low, so I tested with the 6x4 KMP props and finally the Gemfan 6045 carbon nylon prop which is what I will field test it with initially on 3S.

Here are the test numbers for this motor on 3S using the GF 6045 prop and the Turnigy AE-45A ESC with custom settings of 22.5 degrees timing and 24 KHz PWM frequency.

50% throttle - 15.7A/192.3W producing 635 gr/22.4 oz of thrust;

100% throttle - 39.4A/451.3W producing 1200 gr/42.3 oz of thrust.

So I am excited to get to the field and test it, my experience has been that with the GF 6045 CN prop, the bench numbers normally carry over well to the field😊

Park Jet noise...the "other" sound of freedom😎

Cheers,

Scott

Initial impressions and testing of the EaglePower SA2306 2888 kv motor - I bought a ticket on the "hype train"

Hi Everyone -

I fully admit sometimes that I see big kv numbers and get starry eyed thinking they will be the best and fastest motors I have ever tested😳.  That is kind of the case with the EaglePower SA2306 2888 kv motor I recently purchased from Banggood.  Regular price for this motor is listed as $21.99 USD, fortunately I picked mine up on sale for $16.49, so the fact it isn't quite what I expected, that takes a bit of the sting out of it😉

However, compared to the DYS Samguk Shu which really turned out to be a dud, I think I might be able to salvage some performance from this EaglePower motor😀  As you can see, it comes with one prop nut and a set of bolts.  Although I expected my prop nut to thread on clockwise, it ended up being a counter clockwise shaft and nut, so I better not lose it😟

This is another "naked bottom" motor, so pretty light, without any hardware, it weighs 28 gr/1.0 oz.

Some more pictures of the motor.

The motor wires are 150mm/5.9" long.  The air gap between the stator and the magnets is fairly tight, however the motor does not spin all that freely by hand, it feels like the magnets are very strong however, so once I get flying it, we will see if the bearings are reasonable.  The Banggood site provides very little information on the motor other than it is supposedly rated for 45A.

It has a 16x19 mm bolt pattern on the bottom, so fits the "X" mount for park jet just fine.  You can see it also uses a small hex bolt to hold the shaft to the motor, but it does not come with a spare.

With the prop, hardware, etc, the motor weighs 46 gr/1.6 oz ready to go in the plane. 

I started testing with the 6x4 APC gas prop and right away was disappointed by the numbers, thinking I might have another dud on my hands.  Here are the best numbers with the 6x4 APC gas prop, Turnigy AE-45A ESC with custom settings of 22.5 degrees timing and 24 KHz PWM frequency on 3S.  I didn't list this on the motor test spreadsheet, but did put all the numbers for the Gemfan 6045 carbon nylon prop which I will be using with this motor for initial field testing.

50% throttle - 12.5A/152.1W producing 515 gr/18.2 oz of thrust;

100% throttle - 33.8A/415.4W producing 960 gr/33.9 oz of thrust.

As mentioned, I was disappointed when I saw those numbers, but compared to the Samguk Shu motor, the amp draw was still pretty low and with it being rated as a 45A motor, I decided to try another prop.  Here are the best numbers with the Gemfan 6045 carbon nylon prop again with the Turnigy AE-45A ESC with the custom settings mentioned above on 3S.

50% throttle - 13.4A/163.6W producing 585 gr/20.6 oz of thrust;

100% throttle - 32.6A/377.3W producing 1110 gr/39.2 oz of thrust.

So needless to say, I will give it a go and field test it with the Turnigy AE-45A ESC and the GF 6045 CN prop, more testing to follow😊

Park Jet noise...the "other" sound of freedom😎

Cheers,

Scott

Field test of the Racerstar BR2406 2600 kv motor with Gemfan 6045 carbon nylon prop on 3S

Hi Everyone -

I had this little beauty out today field testing the Gemfan 6045 carbon nylon prop as recommended to me by rcplanepirate😀

Today I was running it on the Racerstar BR2406 2600 kv motor which showed incredibly good numbers during bench testing with this prop. 

You can read more details on the bench testing of this motor and a couple others including the park jet workhorse 2212/6 2200 kv motor at this blog post.

Here is the flight video of today's test session.

I am a very happy park jet pilot after seeing that the field test performance lived up to the bench testing or vice versa😉

This prop really wakes this motor up compared to the previous best setup with the 6x4 APC gas prop which I suppose you would expect with a bit of extra pitch, a stiffer prop and slightly different blade design.

This motor with this prop and ESC setup on 3S is now up in the same category of some of the 2700+ kv motors I have been running.  I am very pleased with how it runs and is actually quite efficient when I look at the amp draw compared to some of the 2700+ kv motors.  To get 1070 gr/37.7 oz of thrust at the cost of only 35.3A is a great setup and even though it was quite cool today, I think this motor and prop combo could be run pretty hard even in the hot summer months without issue.

Thanks again to rcplanepirate for the recommendation, please check out his YouTube channel for lots of great testing, educational and flying videos of some seriously fast planes😀

Park Jet noise...the "other" sound of freedom😎

Cheers,

Scott

Gemfan 6045 carbon nylon props initial impressions and testing

Hi Everyone -

I received a couple of packs of Gemfan 6045 carbon nylon props in the mail in the last couple days😀  I tested them today on the 2212/6 2200 kv, Racerstar BR2406 2600 kv and RC Timer FR2306 2650 kv motors.  If you want to skip straight to the test numbers, you can go to my motor test spreadsheet.

As these props were designed for quads, they come four to a pack, two of each rotation.  Lots of prop rings including ones that fit on most park jet motor shafts.  Not a bad deal for $3.79 USD.

The props are quite light, it was hard for my less than accurate kitchen scale to get a good result, but I'm sure they weigh about 4 gr each, the same as a 6x4 APC gas prop, so pretty light.  rcplanepirate has already tested some of these on the bench with very good results.  After watching his tests and having a couple discussions with him, I thought I would pick some up to help boost some more power out of the lower Kv (less than 2700) motors I am currently using.  I figured the little bit of extra pitch with a stiff prop should hopefully give more power at lower RPM and hopefully not drive the amp draw up too high.

Please check out RCPP's YouTube channel, tons of great test and educational info.😀

These props are very stiff, even stiffer than the 6x4 APC gas props, but I am a bit concerned they might be a bit brittle, or perhaps this was just one prop.  As I was trying to get a grip on one of the quad racing motors I tested today to tighten the prop nut, I must have pushed against the prop blade a bit too firmly and it broke cleanly almost right at the hub as you can see below.😒

I compared it's length to the 6x4 APC gas prop and it is 3/16" longer as you can see in this picture below.

There is also a bit more prop blade surface area as you can probably see in the picture above and below.

I know it might be hard to see in these following pictures, the blade thickness seems to be a bit thinner on the Gemfan prop and the pitch is not as aggressive at the hub compared to the 6x4 APC.

The prop blade also seems to have a bit more of a curve or "under camber"(?) compared to the 6x4 APC.  Due to the blade shape and it's stiffness, it is certainly as quiet as the 6x4 APC and again while difficult perhaps to see in this pictures, I can definitely see the increase in pitch down the length of the blade.

Test results discussion

The biggest improvement in power with this prop showed up in the 2212/6 2200 kv motor which is the most popular park jet motor around currently and the Racerstar BR2406 2600 kv.  There was a noticeable increase of mid range power with the RC Timer FR2306 2650 kv motor, but not a big increase in top end, although it did break 1000 gr of thrust on the bench with all three motors which always gets my attention😉  I will focus mostly on the 2212 2200  and Racerstar motors for the rest of the discussion.  I have found in field testing that the RC Timer motor doesn't quite have the torque to continue pushing good power to the top of the throttle range compared to the other two.

I tested all the motors with both the Turnigy Plush 40A and Turnigy AE-45A ESCs (links for these are on the spreadsheet linked in the first paragraph).  For the Plush, everything was left at factory default.  For the AE-45 I used different settings depending on the motor based on experience from my previous testing.  Below I am listing what I think would be the best setup for each motor.  Gens Ace 2200 3S 45C batteries were used for all the testing.

2212/6 2200 Kv motor

I found the mid range power to be best with the Plush ESC, not much difference (5 gr) at top end thrust, so I would probably choose the Plush unless I find another custom setting that would work best with the AE-45 and this motor/prop combo.

50% throttle - 11.9A/145.7W producing 540 gr/19 oz of thrust;

100% throttle - 32.3A/391.8W producing 1020 gr/36 oz of thrust.

Wow😲  The mid range thrust is about 60 gr more than the best I have seen with any other prop/ESC for about the same amp draw.  At full throttle, it is about 70 gr more than the previous best I have seen, with about 4 more amps drawn, but still under the 34A limit that these motors seem to have.  This is the first time I have seen more than 1000 gr of thrust out of this motor on a 2 blade prop!

Racerstar BR2406 2600 kv motor

I found that the Turnigy AE-45A ESC with custom settings of 22.5 degrees timing and 24 KHz on the PWM (pulse width modulation) frequency works best with this motor, so that is what I used.

50% throttle - 12.6A/154.2W producing 560 gr/19.8 oz of thrust;

100% throttle - 35.3A/426.1W producing 1070 gr/37.7 oz of thrust.

Again...WOW😲  Compared to the previous best results I have seen with this motor which is with this ESC with the settings listed above and the 6x4 APC gas prop, it is a 30 gr increase in mid range power for the same amp draw basically (.1A difference) and a 110 gr increase at full throttle for only 1.1 more amps drawn!  If this performance translates to the field with this inexpensive motor, it puts it right up there with the "big boy" quad racing motors I have tested thus far😀

I am very excited to test the GF 6045 prop on the Multistar Viking 2208 2600 kv motor which is the strongest of the sub 2700 kv motors I have tested thus far😉

Of course not to get too excited, but I have run the Racerstar BR2406 2600 kv motor and the Viking motor a lot, so I feel pretty sure they have the torque in the air to keep swinging this prop with authority throughout the throttle range.  But only one way to find out, strap it in a plane and get to the field.😀  I hope to get some initial field test results in the next week weather permitting.

Stay tuned for more bench and field testing with this prop😊

Park Jet noise...the "other" sound of freedom😎

Cheers,

Scott