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

Initial post flight report GepRC GR2306 2750 kv motor

Hi Everyone -

Just back from the field blasting 12 flights through my new GepRC GR2306 2750 Kv motor😀  You can read more about my initial impressions and bench testing of this motor at this blog post.

From what I saw today, this motor paired with the 6x3 EMP prop using the Turnigy AE-45A ESC with custom settings of 22.5 degrees on the timing and 24 KHz PWM frequency is the new "king" of the quad racing motors I have tested thus far in my park jets.👍

Here is some video of one of today's flights.  It definitely has much more power mid range, I had to be careful with how much I advanced the throttle when launching or it would want to rip it out of my hand!😲  Normally with most motor setups I launch at around 60% throttle, with this motor I had to back that off to about 50% throttle to feel like I could still hang on to the plane.

I also flew the EMAX RS2306 2750 kv motor with the 6x3 EMP prop today and overall, the GepRC has more mid range power and top end speed.  Not as noticeable an increase in top end speed, but definitely at mid range between about 50-75% throttle.  In fact, I would estimate I would be able to reduce the throws down a bit more the plane moves along so fast at mid range, just so I could keep up with the plane.😊

I pushed it hard for 12 flights and it ran smooth and strong the whole time, no hesitation no matter how hard I slammed the throttle around.  Although it was a cool day, temps got up to about 12 C/54 F, the motor and ESC ran very cool, barely any noticeable heat build up at all, so I think even in warmer weather, this setup would run just fine.

Very impressed with this motor and it's performance today, I may have to order another one to have a couple of serious speed setups😉

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

Cheers,

Scott

Initial impressions and bench testing of the GepRC GR2306 2750 kv motor

Hi Everyone -

I received this GepRC GR2306 2750 kv motor in the mail yesterday and managed to get some bench testing done today😀

As you can see above, it comes with one prop nut and two sets of M3 screws, one set 7mm long and the other 8mm long.  Without any hardware, the motor weighs 32 gr/1.1 oz.  The motor wires are 150mm/5.9" long.

It has a hollow shaft and fairly minimal metal on the top.  According to the Banggood write up in the link above, it is made with 7075 aluminum.  The shaft is hollow all the way through.

It has curved N52 grade magnets which are one of the best grades of magnets used in brushless motors, it has a nice cut out as you can see in the bottom for the wires to be protected.  It is a "naked bottom" motor with no full base plate as you find on a lot of motors.  The gap between the stator and the magnets is very tight and when the motor is spun by hand, it spins smoothly, but the magnets feel very strong.  The shaft is held on with a small hex bolt, however it does not come with a spare like some other motors I have tested.

The bolt pattern is 16x16 mm, so I will only be able to use two screws to hold the "X" mount to the motor, but I think that will be sufficient.

With the prop and all the other hardware needed to put in a park jet, the motor weighs 48 gr/1.7 oz.

I tested the motor with both the 6x4 APC gas prop and the 6x3 EMP prop with the Turnigy Plush, Turnigy AE-45A ESC and Hobby Wing Platinum PRO 40A ESCs.  You can read the complete details as well as find links to all the components on the motor test spreadsheet.  The numbers are all on 3S.  Again, this motor preferred the Turnigy AE-45A ESC with custom settings of 22.5 degrees timing and 24 KHz for both props.  According to the Banggood specs, this is a 45A motor.

Based on the numbers alone, I think this motor might push the EMAX RS2306 2750 Kv motor out of the top spot for motors I have tested thus far.  

Here are the best numbers for the GepRC GR2306 2750 kv motor with the 6x4 APC gas prop.

50% throttle - 19.9A/238.0W producing 685 gr/24.2 oz of thrust;

100% throttle - 45.0A/506.3 producing 1115 gr/39.3 oz of thrust.

These are the best numbers I have seen for any of the motors I have tested thus far with the 6x4 APC gas prop, although it is a bit amp hungry.  Based on experience, I would fly this motor with the 6x4 APC gas prop and the Turnigy AE-45A ESC, although it would be pushing the ESC especially hard.

Here are the best numbers for the GepRC GR2306 2750 kv motor with the 6x3 EMP prop and Turnigy AE-45A ESC.

50% throttle - 18.9A/225.8W producing 730 gr/25.7 oz of thrust;

100% throttle - 41.7A/478.2W producing 1290 gr/45.5 oz of thrust.

Wow😁😲  This is the first motor I have seen that produced over 700 gr of thrust at mid throttle, incredible!  I won't bother fooling around, the flight test will be with the 6x3 EMP prop and the Turnigy AE-45A ESC😉  Excited to get it out for a spin very soon😁

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

Cheers,

Scott

Bench test session with 2700 Kv plus motors and 6x3 EMP/TGS/KMP prop

Hi Everyone -

I recently completed a fairly significant test session going back through all the quad racing motors I have been testing that are 2700 Kv or higher and testing them with the 6x3 EMP prop.  If you click on this previous link, it will take you to the RC Timer site, these props are also available under different names TGS from Hobby King and KMP from Banggood.  I normally buy mine from RC Timer as although you have to buy them in bundles of five, they are much cheaper.

I had wanted to do this for awhile, and was finally pushed to get it done after recently bench and field testing the Hawksky AT2306 II 2750 kv motor.  You can read more about this motor, my initial impressions and bench testing at this blog post.  Here is some flight video I shot with this prop and motor.

Here is the list of 2700 and over Kv motors I tested on the bench recently.

• EMAX RS 2306 2750 Kv;
• Foxeer DATURA X2206 2700 Kv;
• BeeRotor Z2207 2780 Kv;
• Brother Hobby Returner R2 2205 2800 Kv;
• Racerstar BR2306S 2700 Kv; and
• SunnySky Edge R2305 2800 Kv. 

All of the motors except the Brother Hobby 2800 showed marked improvement in thrust while doing so more efficiently compared to the 6x4 APC gas prop.  The Brother Hobby motor performed worse with the 6x3 prop.  I suspect due to it's smaller size stator, it needs the 6x4 prop to really push the motor to better levels of performance.  You can read the full details of all the test numbers on the motor test spreadsheet.  

The EMAX RS2306 2750 Kv motor continues to be a very good performer and actually with this prop preferred the Turnigy AE-45A ESC with custom settings of 22.5 degrees and 24 KHz PWM frequency over the more expensive HobbyWing Platinum PRO 40A ESC that it preferred with the 6x4 APC gas prop.  All of these results are on 3S.  The EMAX motor still has the best 50% throttle performance although it did not increase significantly over the 6x4 APC gas prop.  It had a significant increase of 125 gr of thrust at full throttle with the 6x3 prop.

EMAX RS2306 2750 Kv motor with 6x3 EMP prop, Turnigy AE-45A ESC on 3S

50% throttle - 16.4A/197.5W producing 650 gr/22.9 oz of thrust;

100% throttle - 36.5A/416.3W producing 1200 gr/42.3 oz of thrust.

The pleasant surprise is the very inexpensive Racerstar BR2306S 2700 Kv motor.  It showed a 20 gr improvement in mid range thrust and 115 gr at full throttle.  I will keep an eye on it as it is pulling 37.1A at full throttle which might be a bit more than it is designed to handle, but anytime I see anything close to 1100 gr of thrust it makes me take notice😀

Racerstar BR2306S 2700 Kv motor with 6x3 EMP prop, Turnigy AE-45A ESC on 3S

50% throttle - 12.3A/153.8W producing 525 gr/18.5 oz of thrust;

100% throttle - 37.1A/459.8W producing 1080 gr/38.1 oz of thrust.

The real star of the show is the SunnySky Edge R2305 2800 kv motor showing a 50 gr increase in thrust at mid range and a whopping 185 gr increase in thrust at full throttle while drawing 5 less amps than it did with the 6x4 APC gas prop😲  It produces the most thrust at full throttle by 50 gr compared to the EMAX motor.

SunnySky Edge R2305 2800 Kv motor with 6x3 EMP prop, Turnigy AE-45A ESC on 3S

50% throttle - 14.2A/172.5W producing 615 gr/21.7 oz of thrust;

100% throttle - 40A/456.8W producing 1250 gr/44.1 oz of thrust.

So I am excited now to do some more field testing, first up will be the SunnySky Edge motor, it ripped with the 6x4 APC gas prop, so if the thrust is that much better with the 6x3 EMP, it should move along pretty smartly😉

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

Cheers,

Scott

Initial impressions and bench testing of the Hawksky AT2306 II 2750 Kv motor

Hi Everyone -

I received my Hawksky AT2306 II 2750 Kv motor in the mail today😀  I picked mine up from Banggood, $22.37 USD, took about 4 weeks to get here with free shipping.

It comes complete with 4 mounting bolts that you would use to mount in on a quad or anything I suppose as well as one prop nut, no bullet connectors as you can see above.  It is pretty light, the motor wires are 90 mm long and with no hardware, the motor weighs 30 gr/1.1 oz.

It has a "naked bottom", so no actual full base plate.  Bolt pattern is 16x19 mm, so the same as a standard "X" mount for use in a park jet.

The Banggood website has very little info on the magnets, etc, they do look curved, a pretty tight tolerance between the magnets and stator.  The bell spins freely, but I can feel that the magnets are pretty strong.  Not sure how many windings it has, the wire is quite thick compared to some other motors of this size I have tested.  As you can see, to remove the shaft, there is a small hex bolt rather than a "C" clip, although it does not come with spare bolt like some other motors I have tested.

The outside of the bell has very small ridges, I am not sure if this is to help with motor cooling.  It is available in green like the base is shown above or all silver like I went for and is also available in 2500 Kv (same price though😉)

With the prop and all other hardware it weighs 44 gr/1.6 oz which is pretty light, about the lightest motor of this size I have tested by about 4 gr.

Bench testing

You can go straight to the motor test spreadsheet for the full details if you would like, I'll touch on some highlights below.  I tested it initially with the 6x4 APC gas prop and the full throttle amp draw was quite high ranging from 43.9 to 47.7A depending on the ESC and the thrust numbers were a bit disappointing compared to other motors of the same size and Kv.  I probably would not fly with the 6x4 APC gas prop as the amp draw would be pushing the ESCs past their base rated limit in all three cases.

So I decided to "prop down" and ran the same tests with the 6x3 EMP prop from RC Timer.  Here are the best numbers using the Turnigy AE-45A ESC with custom settings of 22.5 degrees timing and 24 KHz PWM frequency using a Gens Ace 2200 3S 45C battery.

50% throttle - 17.6A/217.5W producing 646 gr/22.8 oz of thrust;

100% throttle - 42.3A/485.1W producing 1215 gr/42.9 oz of thrust.

So for initial field testing, I will use the 6x3 EMP prop and the Turnigy Plush 40A ESC for consistency.  Even with the Turnigy Plush on default settings the results were quite good with the 6x3 EMP prop.

50% throttle - 17.3A/211.5W producing 624 gr/22 oz of thrust;

100% throttle - 39.7A/451.6W producing 1155 gr/40.7 oz of thrust.

As I continue to fill out my spreadsheet, I will go back and test several of the other 2700+ Kv props with the 6x3 EMP prop to see the results.

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

Cheers,

Scott

Field test of the 2212/6 2200 Kv motor Gemfan 6045 carbon nylon prop on 3S

Hi Everyone -

I had this little beauty out today for some thrashing around on a bit of a windy day😀

Today I was evaluating the Gemfan 6045 Carbon nylon prop to validate it's performance with the very popular 2212/6 2200 kv motor.  For the full details on the bench test performance, please go to my motor test spreadsheet and scroll along the bottom all the way to the left for the sheet with data for this motor.

Here is some flight video discussing this prop as well as some feedback on the FlySky FS-i6 transmitter I have started evaluating.  More will be covered on the transmitter in a separate video.

As I mention in the video, I am very impressed with the performance of this inexpensive prop with this motor.  I discuss in more detail my initial impressions of this prop and bench testing in this blog post.  I was running the Turnigy Plush 40A ESC today as the performance on the bench at mid range was a bit better.

I did notice the biggest improvement at mid range throttle around 50-60% with this prop compared to the 6x4 APC gas prop.  Top end even though this prop produced about 70 gr more thrust at full throttle, I didn't see as big an improvement at full throttle compared to the 6x4 APC gas prop, but overall the GF 6045 prop is producing more speed and power with this lower Kv motor.  As I mention a couple times in the video this is a very good thing as I think these Gemfan props are much easier to get for most people around the world compared to the gas props and they are cheaper.  

With free shipping from Banggood, these props cost about $0.95 USD whereas with shipping included, I am paying about $3.09 per prop for the 6x4 APC gas props.  From what I have seen thus far, these GF 6045 CN props are a great, inexpensive choice for motors of about 2600 kv or less.  As discussed in the video, I did have to play around a bit to find a prop spacer ring that fit snugly otherwise the prop vibrated and ran loud and inefficient.  Here is a video from rcplanepirate that shows how he modifies prop spacer rings to get them to fit snugly and help the prop run more efficiently.

In conclusion, these GF 6045 CN props will become my "go to" prop for motors below 2600 Kv as they have shown much improved performance over the 6x4 APC gas props without a whole lot more amp draw.😀

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

Cheers,

Scott