DrMotor

HERE ARE THE NEXT 6 MOTORS:

9. XYH N 5065 / 05, 421g, KV 410, D50 L65 -http://en.xingyaohua.com/html/play/429.html
-Also has right Kv, but is 75g heavier than Hacker A50, and is 65mm long motor. XYH "N-Type" motors are heavier than "C-type"
£35.82 http://www.giantshark.co.uk/n506505k...-p-407744.html

10. Suppo 4130/6 430kv (Power 60 equiv.), 400g, D 50 L65
-Suppo motors have been around for long time; Has ~right Kv, is ~50g heavier than Hacker.
-Also see BP Hobbies for Suppo motors - http://www.bphobbies.com/view.asp?id=V450327
$55.99 = £36.85 - http://www.altitudehobbies.com/brush...=DESC&limit=50

11. GForce G60 (5065), KV400, 360g, D50 L65
-Looks like a well made motor, has right Kv and weight; is a 65mm long motor; May be similar to XYH C-type 5065 motor.
$58 = £38.17 - http://www.valuehobby.com/power-syst...g60-kv400.html

12. Neo 60-410 Motor, 440g, Kv410 D 50 L65mm-looks just like an XYH N 5065 motor (must be made by XYH ...)
-Is almost 100gheavier than Hacker A50 motor;Kv about right; is a65mm long motor
-Esprit website states that is suitable for Hangar 9 Funtana X50 -and can be used on 5S Li-poly with an 18x10 APC-E prop
$69.00 = £45.41 - http://www.espritmodel.com/neo-60410...ess-motor.aspx

13. LiPolice LP-4025 /16T-385KV, 335g, D50 L52
-Made in Sunray factory along with Hacker, Hyperion etc; it isidentical internally to the Hacker A50-16 S motor; However, Kv is too low for this application, just like it is for theHacker A50-16 S motor.
52.90 Euros = £44.63 - http://www.der-schweighofer.at/en/pr...4025_16t-385kv
-NOTE: SCHWEIGHOFER HAS FREE SHIPPING TO ALL COUNTRIES IN EU (for all orders > 90 Euro)
BASICALLY WE HAVE HERE: A £115 HACKER A50-16 S MOTOR, FOR JUST £44.63 ... That is a good deal

14. BMI SPITZ 60, 325g, Kv 460 - http://www.bmi-models.com/#en/85556_...0_40S18/6/1421
BMI SPITZ motors are also made in the Sunray factory, are identical to Hacker, Hyperion, etc; This motor is same as either Hacker A50-14 XS (but has lower Kv of 460) or else is same as Hacker A50-14 S V2 ( -It is probably an identical motor to: Turnigy SK3 5045-450kv )
89 Euros = £75.08 - http://www.model-discount.eu/modelis...-60-278-0.html

DrMotor

XYH / EMP MOTORS IN THE USA

See: http://milehighrc.com/brushless.html
and http://www.mayor-hobbies.com/shop/ca...id_category=24
-for a collection of XYH-EMP motors being sold in USA;

At MileHighRC, ALL the motors with black can/red end housings motors are XYH motors.
And: ALL the motors at MileHighRC with black can/gold end housings are made by Shenzhen Feisuda Motor - www.fsd-motor.com
-and these FSDmotors are identical to Leopard motors, Power-HD motors and Overlander "new V2 MK2" motors -also called "Tornado ThumperV2 MK2" motors -e.g. http://www.overlander.co.uk/motors/outrunner-motors.html

-This shows that the Shenzhen Feisuda Motor factory manufactures: Leopard motors, Power-HD motors, and also the Overlander "Tornado Thumper" "V2 MK2" motors.

Shenzhen Feisuda Motors "fsd-motor" -are also often sold as "FC"motors and as "FSD" motors -Many of them can be seen at HiModel as "Type FC" motors and on eBay as "FSD" motors:
http://www.himodel.com/sort.php?sub2=FB&page=11 & http://www.himodel.com/sort.php?sub2=FB&page=12
http://www.ebay.com/itm/New-FSD-720-...-/400055986585

( -All theolder Overlander "Tornado Thumper" motors wereXYH motors ...).

DrMotor

HERE ARE LAST 5 MOTORS:

15. Pilotage Nova Line DT4123/14 Kv 425
Made in Sunray factory, is exactly same motor as Hacker A50-14 S. Price in Ukraine / Russia is generally similar to Hacker USA price.
$120.29 = £79.18 - http://www.pilotage-rc.com.ua/catalogue/85_/85_20/

16. MOTROLFLY DM-4320, 380g, 400Kv (4320 stator) D 54.8 mm L 46.0 mm
-Motrolfly known to be very high quality motors -are not cheap ..-Has right Kv,heavier than HackerA50 S; Diam greater, and shorter.
$149.95 = £98.07 - http://www.subsonicplanes.com/Motrolfly_Motors.html

17. E-Flite Power 60, 400Kv, 380g, D50 L62 - http://www.e-fliterc.com/Products/De...odID=EFLM4060A
-Has right Kv ; weight 35g more than Hacker A50; is 62mm long;
-Tacon motors are similar but NOT identical toE-Flite;Taconare identical to Exceed-RC "MonsterPower"; Theycostonly 30% of E-Flite motors)
£111.31 - http://www.kingslynnmodelshop.co.uk/...duct_info.html

18. Hacker A50-12 S, Hacker A50-14 S, Hacker A50-16 S
-Which is where we all started ... -The Hacker A50-S motors are the most expensive of all the motors listed here...
£114.69 - http://www.westlondonmodels.com/Elec...rs/Hacker-A50/

DrMotor

There are several points to make, from this investigation of motors and their prices:

1. I was very surprised indeed (and really shocked) about the huge, quite enormous range of price, for motors that are basically similar -about 350g in weight, and that all have a Kv ~420 RPM / V. -These are not small motors, and neither are they large. They are mid-size brushless motors.
The majority of the motors in this list cost between £21 and £45, and it was only really the Motrolfly, the E-Flite and the Hacker that cost a huge amount more. The Motrolfly was almost £100, and the E-Flite and Hacker were well over £100.

2. The price of the very similar size motors in this list, varies from £21.33 all the way up to £114.69 for the Hacker A50-14 S motor. It is possible that similar motors from Kontronik, Neu, Lehner and Plettenberg might have been even more expensive than the Hacker -however I have not checked those makes.
-The motors in this list have generally similar properties, they have a similar Kv, and are likely to give similar levels of current, prop RPM and thrust -when used with the same prop and the same number of LiPo cells.

3. It is very striking indeed, that the XYH C 5505 / 08 motor costs just £21.33 -this is just 18% of the cost of the Hacker A50-14 S motor (in the UK). The Hacker motor costs 5.4 times as much as the XYH motor.
I ask again -is the Hacker A50-14 S going to give us a 5.4 times better performance than the XYH motor ? Will the Hacker generate 5.4 times more thrust ? Will the Hacker last 5.4 times as long as the XYH motor ? Is the Hacker 5.4 times better quality than the XYH motor ?
I am completely unsure about what might be the actual basis for the absolutely massive gulf in the prices of these motors. What might be the reason for the enormous difference in cost between the XYH and the Hacker motor ?

4. Many people find that XYH motors are very good quality indeed, and that they also give extremely good performance. A great many people are happy with XYH motors.
After all, XYH motors will have been sold in their many millions. This is partly because the standard Turnigy "Aerodrive" chrome/gold motors, soldover manyyears by HobbyKing in large numbers, were all XYH C-type motors. The slightly higher quality "Turnigy AerodriveXp SK" black/ silver motors, also sold by Hobbykingover several years,were all XYH N-type motors (-these have now been largely discontinued -just a few remain on the HobbyKing website). Most people who have used either Turnigy Aerodrive standard or the AerodriveXp SK motors have been very happy with them. So it is not as if XYH have any obvious poor quality or performance, that might explain their relatively low price.

DrMotor

CONT:

5. We know that the (relatively new range of) Turnigy SK3 motors are made in the same Sunray Tech factory as Hacker, and that they are pretty much identical to Hacker -both internally and also largely externally. And yet the Turnigy SK3 motor is only 28% of the cost of the Hacker; And this particular Turnigy motor ( SK3 5055-430kv) actually has a larger stator than the Hacker, and is a slightly heavier motor.
There seems no real way to explain exactly why the Hacker costs almost 4 times as much as the similar Turnigy SK3 motor.

6. It has been noted by many people before, that Turnigy SK3 motors are very similar to Hacker, Hyperionmotors, in terms of weight, Kv, power etc -acrossthe whole range of motor size, from small 16g motors up to very large 900g motors.
For instance, as far as 30-size motors are concerned, the Turnigy SK3 3542-800Kv 14T motor is indistinguishable from the Hacker A30-14-L motor also fromthe E-F Torque 2814T/820 motor. The Turnigy SK3 3542-1185kv 10T motor is indistinguishable from the Hacker A30-10-L motor etc etc.
see: http://www.rcuniverse.com/forum/fb.asp?m=11427116
-However, the same principle does not carry through for these 50-size motors. There are no obvious SK3 motors withidentical weight and Kvto the 345g Hacker A50 -S motors.
see: http://www.rcuniverse.com/forum/fb.asp?m=11427948
The closest to the Hacker A50-14 S (Kv 424) appears to be the Turnigy SK3 5055, which has an almost identical Kv of 430kv. It is also a 14T motor like the Hacker. However, at 370g it is 25g heavier than the Hacker, and also it has a 4030 stator rather than the 4025 stator of the Hacker. The larger stator should actually make the SK3 motor capable of generating more power and thrust than the Hacker motor.

7. It was also useful to compare the LiPolice and the Hacker motor. We know that LiPolice motors are also made in the Sunray Tech factory, along with Hacker, Hyperion, Torque motors and all the other "typical Sunray brands" etc etc. The LiPolice LP-4025 /16T is an identical motor to the Hacker A50-16 S, the only difference is cosmetic in that the LiPolice has differently machined end housings, and has a green colour on the outside. The 2 motors give identical performance.
-And yet the LiPolice motor costs just £44.63, whilst the identical Hacker costs 2.7-fold more (£114.69). It is difficult to fathom just why the Hacker motor might cost nearly 3 times as much, when the only real difference between them is that Hacker are purple, whilst LiPolice are green.

8. Finally, why are E-Flite motors so expensive ?There seems nothing special about E-Flite motors, indeed they just seem like all the others. We know they are made by the Himark Electronic & Model factory (a.k.a. ChinaHimark), which also makes Himax motors(sold in Europe as"JP-Energ" and Topmodel "XPower" motors).The XPower XC5020/14 motor is a similar size to the E-Flite 60, and yetcosts only £70. So exactly why does the E-Flite 60 motor cost £111.31 ? Andwhat is so much better about the E-Flite motor that it should cost more than 5 times as much as the XYH C 5055 motor ?
-It seems little wonder that several "clones" or "copies" of E-Flite motors (some perhaps made in the very same HiMark factory where E-Flite motors are made ...) -like Turnigy G-series motors and Tacon motors -have become very popular, because they cost only 30% of the same size E-Flite motor.

DrMotor

AN OPEN REQUEST TO EVERYONE: PLEASE CONTRIBUTE TO THIS THREAD:

There are probably many motors that I have left off this list -just because I did not know about them.

There are probably a great many other motors out there, that are a similar size (~350g) and that have a similar Kv (~between 400 and 430) -that can beused for 50-size planes.

If you know of some motors,please post the information about them so that we can all see.

REGARDLESS OF MOTOR SIZE:
If you know ofANY brushless motors that work well and that you have been impressed with,PLEASEpost information about them,their performanceand their cost,on this thread.

Similarly, if you have bought a motor, and for some reason have not been happy with its quality or performance, please also post information about this motor, or the motor range it comes from, on this thread.
-This information will beVERYuseful to all of us.

COME ON
LET'S ALL GET POSTING ....

DrMotor

NEWS:
JUST NOTICED: THAT HOBBYKING HAVE REDUCED PRICE OF TURNIGY SK3 F3A MOTOR
-FROM $159.99 TO $139.15 .... -THAT IS A REALLY GREAT PRICE ... !

F3A SK3 Competition Series 28 Pole Outrunner
http://www.hobbyking.com/hobbyking/s...Outrunner.html

(-Was the idea to make it just a little bit cheaper than the OK Hobby Infinite F3A motor ...?
see: http://www.rcuniverse.com/forum/fb.asp?m=11458642 )

arfwrecker

My Feedback: (12)

thank you dr motor the most comprehensive list, simply awesome.

DrMotor

Thanks very much indeed, arfwrecker

-PleaseDO contribute to this thread.

DrMotor

LIPOLICE MOTORS -BARGAINS AVAILABLE ...
-Just looking at LiPolice motors on Modellsport Schweighofer - http://www.der-schweighofer.at/en/gr...less_engines/2
-noticed there are several bargains available, for anyone who is interested. -Most of the LiPolice motors are out of stock (they must have been popular ...), however these ones are notable:

1. LiPolice LP-4025 /12T-510KV € 61.90 =£52.19
This is exactly the same motor as the: Hacker A50-12 S V2 (Kv492)
-which costs £114.69 in the UK - http://www.westlondonmodels.com/Elec...er-A50-12S.asp
So: LiPolice is less than half the price of the identical Hacker

2. LiPolice LP-5025 /24T-195KV € 99.90 =$128.06
This is exactly the same motor as: HYPERION Z5025 24T 200 KV -a large~550g 60-size motor
-which costs $199.95 - http://www.b-p-p.com/product.php?pro...&cat=30&page=5
or $274.00 - http://www.airsportsrc.com.au/motors.html
So: LiPolice motor is less than half the price of the identical Hyperion, taking the price at AirSports-RC

3. LiPolice LP-5035 /18T-195KV € 124.90 =$160.11
This is exactly the same motor as: HYPERION Z5035 18T 190 KV -a large~800g 60-size motor
-which costs $214.95 - http://www.b-p-p.com/product.php?pro...6&cat=0&page=1
So: LiPolice motor is about two thirds the price of the identical Hyperion motor

fly210sv

My Feedback: (1)

It's funny, 2 years ago i bought a Turnigy G46 to replace an E-flite Power 46. I was thrilled with the performance and was convinced at that time that these were the same motors or a great copy. I now use the Turnigy motors in any of my new airplanes or replacement in old ones. I've done the same thing with the Zippy batteries over the E-flite batteries. The discharge rate of the zippy's are very good and I prefer them over E-flite.

DrMotor

Thanks very much indeed for contribution, fly210sv. Please keep contributing.
Yes, mmmm .... -In post #1 of this thread, I suggested that not only are E-Flite motors made by the Himark Electronic & Model factory, that also the Turnigy "G" motors might also be made by the same factory.
What do you think, fly210sv -did the G46 look like the exact same motor, just with a Turnigy sticker on, rather than an E-Flite sticker ...?

I have a few points to make:
1. The E-flite Power 46, 670KV: 290g, D50 L55, has 4020 stator. In USA costs $90 - http://www.espritmodel.com/eflite-po...ner-motor.aspx
2. The Turnigy G46 670kv, has same dimensions but is quoted as 303g. However, price is $46.09 -half that of the E-Flite USA price.

3. BUT: in the UK, the E-flite Power 46 costs £99.97 =$152 ...!
http://www.kingslynnmodelshop.co.uk/...duct_info.html
-So for people in the UK, if they get the Turnigy G46, for them it is actually 1/3 of the price of the E-flite Power 46 ...! Very tempting ... So why would anybody actually buy an E-Flite 46 ....?

4. However, these days if I am buying from HobbyKing, I would much rather get a Turnigy SK3 motor than a G-series motor, because I think SK3 are better.
I can see that the Turnigy SK3 5045-660kv (280g) is almost an exact match for the E-Flite 46, and only costs $37.27 The Turnigy also has a 4020 stator, just like the E-Flite motor see: http://www.rcuniverse.com/forum/fb.asp?m=11427948
-The Turnigy SK3 5045-660kv is alsothe exact same motor as the HYPERION Z4020 12T 660 KV -and of course Turnigy SK3, Hyperion and Hacker and all the others, are all made in the Sunray Tech factory.

To me, the E-Flite motors (and the Turnigy G-series) all look a bit "agricultural",and I think the Turnigy SK3 "Hacker look-alike" motors look much better -and probably also have better performance (and they are cheaper ...). Cheers Mate

fly210sv

My Feedback: (1)

I'm running the Turnigy G 46 in a Hangar 9 P-51 with robart retracts. It has a Redbrick 125 amp esc with a Zippy 5800 mah 5 cell. I then duplicated the setup in the HobbyKing 1600mm P-47 foamy. Both have Master Airscrew K Series 16x8 props and they both haul the mail. The sound from the prop is great. The P-51 originally flew with a .46 evolution nitro then an .60NX nitro. The G46 out performs the .60 NX motor. I also have a Pulse 25-e from eflite. I run a 4 cell 3200 mah battery with an E-flite power 25 motor. I then purchased a Turnigy G25 and replaced the E-Flite. Same performance. All three motors run cool as does the battery and the esc's. I get about 6 minutes of heavy butt hauling flying out of each setup. Can get 8 minutes with throttle management.

DrMotor

I RECEIVED THIS MESSAGE FROM rosnik.

THIS WAS MY REPLY TO HIM:
I have a few points to make:
1. The Turnigy L5055A-400 motor: - http://www.hobbyking.com/hobbyking/s...ner_400kv.html
is almost certainly an XYH motor (see pics -the rear housing of the L5055 motor is amost identical to the XYH ... )
This motor is probably the XYH C 5055 / 08-which also has a Kv of 400 - see: http://en.xingyaohua.com/html/play/411.html

2. The L5055A-400 only weighs 293g -so it cannot have the same power as a 345g Hacker motor.

3. The L5055A-400 motor has a stator which is only 4020 in size. We can see this from the HK website, because the can length for this motor is 25mm (i.e. measurement D on the diagram of the motor) and the stator will be ~4-5mm shorter than this =a 4020 stator for this motor.

4. In comparison, the Hacker A50-14 S has a 4025 stator, and so is bound to be more powerful than the Turnigy L5055A motor.

5. However, the Turnigy SK3 5055-430kv (the motor we have suggested as an excellent alternative to the A50-14 S), has a 4030 stator, and will be MORE powerful than the Hacker A50-14 S.

You will see, rosnik, that this will be the case ... I will "eat my hat" if I am not correct ...


Pics show: 1, Turnigy L5055A-400, 400Kv motor; 2, XYH C 5045 motor, rear view; the XYH 5055 motor looks identical

DrMotor

Re: posts #94 to #106 of this thread:
MY OWN OPINION ON THE 50-SIZE MOTORS -with a Kv ~420, weight ~350g. Which one would I use ?

If I was building a Sebart Angel 50 / Wind 50, or similar plane like: 3DHS Osiris 62", or an Extreme Flight, Precision Aerobatics, or E-Flite 50-size plane (e.g. the new E-Flite Carbon-Z Splendor designed by QQ Somenzini) -and I wanted to use 5S LiPo, something like a 16x8 prop and I was choosing a good motor :

1. My first choice would definitely be: Turnigy SK3 5055-430kv
The reasons are:
a. I have several of these SK3 motors, and they all perform superbly. I have not had one bad SK3 motor.
b. They are made in the same Sunray factory as Hacker, Z-Hyperion etc; And they use basically all identical parts to the Hacker motors. And yet the Turnigy is only 28% of the cost of the Hacker A50-14 S.
c. The Turnigy SK3 5055 has a 5030 stator -the Hacker motor only has a 5025 stator -and so the Turnigy motor will be MORE powerful
d. For a real excellent quality motor with a great pedigree, the SK3 costs very little more than the XYH motor
e. The SK3 motors are basically a Hacker / Hyperion-Z / Torque motor, for 25% to 30% of the cost ...
f. The Turnigy SK3 5055-430kv has excellent user comments on the HK website.

2. My second choice would be: XYH C 5065 410kv motor
This motor has really excellent user comments: see http://www.giantshark.co.uk/xyh5065-...-p-404748.html
e.g. " ...This went in my Sebart Angel Evo 50E but on trying a 16x10e on 6s lipo it was 55amp as this motor is rated 40amp I proped down to 15x8e this was 46amp this has power to fly great, so a good buy ..."
" ... A cracking motor. Used in my 81/2 lb Hurricane On 6 cells 16x10 APC prop 1780 watts 78 amps 15x8 JXF wooden 1580 watts 66 amps. Perfect for purpose and great value No hesitation for 5/5 ..."
" ... This motor is something else! Perfect for that large scale plane. I have fitted it into a 1/4 scale T61 motor glider, yet to fly. Static thrust tests look like there is more than enough thrust. The only problem was the need to open the prop diameter up to fit the mounting, as it was too large for the prop. Everything else, brilliant ..."

DrMotor

50 SIZE MOTORS: IF I WANTED TO USE 6S LIPO, AS MANY PEOPLE DO ON 50-SIZE PLANES
-And I would probably use a 16x10 or 17x8 prop -Then we would need a lower Kv motor, similar to the Hacker A50-16 S (Kv 378)

a. In this case, my first choice of motor would definitely be: Turnigy SK3 5055-320kv (369g) or Gens ACE Mars BL4850-340KV (370g)
see: http://www.rcuniverse.com/forum/fb.asp?m=11463483
These 370gTurnigy and Gens Ace motors are completely identical, and are of course made in the same Sunray factory -along with Hacker, Hyperion-Z etc etc.
They have a 5030 stator, and so will be MORE powerful than the Hacker.
And yet they only cost 28% of the Hacker A50-16 S motor (-the Turnigy is $49, the Gens Ace is 80.87€ =$103; In comparison the Hacker -in UK and Europe -is $174)
see: http://www.hobbyking.com/hobbyking/s...ner_Motor.html
http://www.gensace.com/epages/genspo...s-BL4850-340KV

b. My second choice of motor would be:
LiPolice LP-4025 /16T-385KV -52.90€ =$67 - http://www.der-schweighofer.at/artik...4025_16t-385kv
HYPERION Z4025 16T 368 KV -$65.80 - http://aircraft-world.com/shopexd.asp?id=5611
Foxy C4025/16 385 Kv -£70.95 =$107 - http://www.puffinmodels.com/product.php?prod=2147

All these motors are of course IDENTICAL internally to the Hacker A50-16 S (they all have identical weight and Kv, and the same performance as Hacker), and are all of course made with the same parts as Hacker motors in the same Sunray Tech factory.

The Hacker A50-16 S motor is far too expensive, at $174.
The identical Hyperion 4025/16T and LiPolice 4025 /16T areboth 1/3 the cost of the Hacker, and yet they arethe very same motor internally.
So why on earth buy the Hacker when it is 3 times the price, for exactly the same motor...?

rceccleston

When comparing the power, would the 5055-430Kv not perform well if not better on a 16x10 prop?

DrMotor

Hello rceccleston: Great to see you posting. Please continue to contribute.
I have looked at the table you uploaded as a PDF file, and I post it here as a JPG file. I have 2 questions:
1. The table says "Stator" for each motor in the list -However, this isnot stator size, it is the external dimensions of the motor.
The SK3 5045-size motor -has a 4020 stator;
The SK3 5055-size motor -has 4030 stator etc etc
see: http://www.rcuniverse.com/forum/fb.asp?m=11427948

2.Out of interest, where did you get the table from ?

3. As for which prop might perform "best" with the SK3 5055-430Kv motor, it seems difficult to say without real test data for this motor.
Also it depends whether you are using 5S or 6S LiPo ...?.
Its Kv of 430 is close to the Kv of the Hacker A50-14 S motor (Kv 424) -and this 14-S motor on 6S LiPo, with a large prop, might well give currents significantlygreater than 70A, which is its rated max peak current ...?
-Simulations onDriveCalc may help, but we cannot do these for theTurnigy SK3 5055-430Kv motor, until we have reliable test data for this motor.

PICTURE OF TABLE REMOVED -UPDATED AND CORRECTED TABLE IS GIVEN 2 POSTS LATER

rceccleston

Your very right, sorry for the stator error, I created this from the HobbyKing specifications.

Please find attached the spreadsheet.

Feel free to update, modify etc.

DrMotor

I attach the corrected table -as a JPG image.
Why do think the SK3 5055-430Kv motor might perhapsperform better on a 16x10 prop ?
-Were you referring to5S or 6S LiPo?

rceccleston

Hi DrMotor,

I am looking to run this size motor on premium brand 6s pack (Opti-Power) within a HobbyKings Sbach 50e (60 inches).

Looking at the HobbyKing reviews, below are some of their results on 6s.

16x10 - 80A
15x8 - 68A
14x8 - 45A

DrMotor

I looked at the HK site for the Turnigy SK3 5055-430Kv motor- http://www.hobbyking.com/hobbyking/s...ner_Motor.html
-And whilst there are several good comments, no-one has actuallymeasured current and prop RPM(and actual voltage) atthe same time -which is what we need for proper simulation. However ther was just ONE comment: " ... I put this motor on a 90 size F3A model. ... with a 6S 5000mAh ... It run a 17x10 TGS prop at 6690 RPM ...static traction is 5 kg. ...in-flight maximum current is 78A. ... I obtain a constant speed for F3A program. Good value! ..."
-So he measuredcurrentand prop RPMat the same time, and we know he was using 6S LiPo (=driving voltage of 22.2V).
This allowed me to simulate this motor on DriveCalc -see attached pic 1for the motor using a 16x10 prop, and 6S LiPo.
Here are some values that DriveCalc gave, all with 6S LiPo, and for different props:
prop Current (A) RPM Thrust (Kg)
15x8 53.6 7965 5.10
16x10 68.4 7500 5.16
17x10 79.5 7156 5.96 (-this is close to values given on HKsite)
18x8 83.6 7028 7.24

-Look like, from the low-ish g/W values, the 17x10 and 18x8 may have been overloading the motor a little.
Interestingly, there was almost the same thrust for15x8and 16x10 props -I would not have expected this ... The 16x10 prop drew much more current, and only gave the same thrust -so there was no advantage in using this prop.

However: A 16x8 prop gave: 63.2A, RPM 7662 and 6.4Kg thrust (see pic 2)-So: You may well be much better off with a 16x8 prop (-which is the exact prop that rosnik wants to use .. -but he is using 5S LiPo ...)
It is notablethat the 16x8 prop drewless current than 16x10, but gave much more thrust (6.4kg)
-Notice also that the 16x8 prop has a much better "Thrust efficiency" of 4.6 g/W (compared to the 16x10 prop which has only 3.4 g/W).

It looks like with 6S LiPo, the 16x8 prop may be optimal for this motor ..?

From the HK website, manuf. specs state this motor has a max current of 70A, and max power of 1750W. The 16x10 prop is almost at this limit of 70A.

-Hope this helps

DrMotor

Regarding the Turnigy SK3 5055 motors -I wonder why there is no 14-turn motor with a Kv between 320 (16T) and 430 (12T) ...?
-It seems a very obvious gap in Kv, and it might be have been good to have a 14T motor with a Kv ~380 -to allow larger props to be used than on the SK3 5055-430Kv 12T motor.
-Maybe Hacker thought that it would be much too similar to their very popular Hacker A50-16 S, which has a Kv of 378 ...?
And maybe this is why there is no SK3 5055 14T motor with a Kv ~380 ?

DrMotor

Well, I could not resist: How does the Turnigy SK3 5055-430Kvmotor perform with 5S LiPo ?
So I ran some simulations on DriveCalc. Pic 1 shows the situation with 5S LiPo, and a 16x8 prop.
It gavethe following figures:

prop Current (A) RPM Thrust (Kg) g/W
15x8 38.3 6854 3.35 4.7
16x8 46.2 6606 4.57 5.3
16x10 51.1 6453 3.82 4.0
17x10 58.7 6218 4.41 4.1
18x8 63.1 6082 5.43 4.6
19x8 64.2 6048 5.71 4.8

Once again, the 16x10 prop performed badly. It drew more current that the 16x8, and gave much less thrust (see Pic 2).
Also, the 17x10 prop gave a much higher current than 16x8, and generated less thrust than 16x8.
Larger 18" and 19" props gave more thrust, but at higher current.
The prop with the highest g/W value was 16x8 -and this looks like maybe the best prop also, for 5S LiPo ....

Must get on with other things now ... Enough DriveCalc ...

rosnik

Thank you for info about SK3 5055-430Kv, DrMotor!
Can you please get MotorCalc measure with APC 17X8 with 5S too?

However I think that best, to improve trust would be to find 17X5,5W or 18X5W ( not in the market),
but the air-speed will sure get low.
Sure all this, is in RC plane type and use depending.