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Sk3 motor for sebart wind 50E

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Sk3 motor for sebart wind 50E

Old 11-08-2013, 11:26 AM
  #1  
arshish1612
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Default Sk3 motor for sebart wind 50E

Hello,

Can i please get some advice on the correct motor for the wind 50E. I cannot afford the hacker setup.

I am looking at the SK3 5055 320kv OR the 430kv and will run on 6s with a 16x10 prop.

My concern is that fro what i have read the 16x10 will draw very high amps. I know the sk3 is rated for 1700w vs the 1200 for the hacker but i dont need the extra watts cause it only means shorter flight times.

Also i would like to use the recommended 16x10 prop.

I believe the a50 16s delivers about 1200w on a 16x10 with less than 50 amps. Any recommendations on a motor that is similar to this?

Thanks,
Arshish
Old 11-08-2013, 12:01 PM
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Velco
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For 16x10 and 6S you need 380kV, therefore 430kV will be too hot on 6S and 16x10. You should try 320kV with 17x12. But you should also know that not all props are the same and that there are props which are less power hungry than the usual APC. Fiala props worked best for me, after that Xoar.

Velco
Old 11-08-2013, 01:48 PM
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arshish1612
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Thank you for replying velco. Were you running a similar setup for the wind?

Can anyone post the watts, amps and thrust with 16x10 and a 17x12 for sk5055-320kv running on 6s please. The comments on the HK product page seem to suggest this needs an 8s. Will I be able to get 1200w on 6s?

Last edited by arshish1612; 11-08-2013 at 02:31 PM.
Old 11-08-2013, 04:33 PM
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Jetdesign
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For 8S I have used 290-310kV. 320 would be a little on the high side but I'd probably use something between a 17x6 and an 18x8. 6S would be a bit higher kV. Velco's recommendation of 380kV sounds just about right to me. 400-410 might be ok with a smaller prop.

Check out the E-flite Power 60. It is less expensive than the Hacker and you still get first rate quality and service. I personally would prefer to save up the extra money and get a reputable power system for a nice plane like that Wind. E-flite makes a good motor. Or you can check out the Electrifly Rimfire motors, also about the same price as the E-flite.
Old 11-08-2013, 07:58 PM
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arshish1612
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Checked the eflite 60 400kv. Its the same price as the hacker....

Im leaning towards the sk3 5055 320kv with a 17x10 or 17x12 on 6s suggested by velco. Would anyone have the stats on this combo?
Old 11-08-2013, 11:37 PM
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Velco
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Some years ago I had A50 16S (380kV) on 6S and 16x10 on Angel. It was really a good combo. But the batteries from 3-4 years ago can not be compared to the batteries of today, today are much better! Currently I am using Zippy Compact 5000 5S 25C on all of my planes, including a 2m F3A and EF 78'' Extra.

Few guys I know are using YEP/SK3 430kV on 5S with 16x12 on Angel. I am using Hacker/Hacker A50 425kV (new 2.1 version) on Miss Wind 50 with 5S and 16x12. When we compared the rpm and the temperature of the two motors at landing SK3 had nothing to envy to Hacker, it is only some 20g more heavy to this new version (but still 30g lighter compared to the old version). I also have few smaller SK3 motors and they are all really well done, worth the money.

As Joe has suggested you can also try the 430kV with 15x10. I have put some numbers into the ecalc just to compare the 3 combos (380kV with 16x10, 320kV with 17x12, 430kV with 15x10) and the rpm for these 3 should be: 7000, 6000 and 8000. Speaking of Amps, well these are highly dependent on your batteries and the prop you are using (Fiala, Xoar, APC, TGS, TR-LE) and should be somewhere in between 50-60A.

If you like to fly fast(er) go for 430kV combo, otherwise 320kV is a better choice.

Velco

Last edited by Velco; 11-08-2013 at 11:48 PM.
Old 11-09-2013, 01:21 AM
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arshish1612
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Thanks everyone decision made. Going with the 320kv and try the 17x12 to start.

About the esc and servos....

Esc - yep80
Servos - can you please recommend hitec or turnigy mg servos please.
Old 11-09-2013, 02:32 AM
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For me the spectrum 821 servos are the one to go for in this set up
Old 11-09-2013, 03:06 AM
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arshish1612
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Saw the spektrum 821. I can manage that price but unable to source locally in uk. What would you re ommend for the alieron mini servos
Old 11-09-2013, 06:41 AM
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Jetdesign
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Hobbico makes some nice little digital mini servos. They are actually made by either Hitec or Futaba. I think I have the CS-11 or something like that.

I've heard good things about Spektrum servos. I love the JR DS821's, maybe they are the same?

I saw the Hacker listed at $150 and the E-flite at $100.
Old 11-09-2013, 06:47 AM
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Look for CORONA MG servos at HK i use'em and have worked well all the way.

http://hobbyking.com/hobbyking/store...earch=929%20mg
Old 11-09-2013, 08:15 AM
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I would go the Savox way, Savx SC-0254MG Digital on the rudder and Savx SH-0255MG Digital for the rest.

If you will be taking Yep ESC then prog card is a must because you will need it to program throttle end points.

Velco
Old 11-09-2013, 08:16 AM
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arshish1612
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gaRCfield:

Would the 821's fit all around? Wouldnt I need mini servos for the ailerons?
I actually have 3 futaba S3010's lying around.... would they be good for this model?

In the uk the eflie is 99 and the hacker is 110
Old 11-09-2013, 08:24 AM
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Velco
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Futaba 3010 would do just fine but you would need a modification in order to make it fit in the ailerons.

http://www.rcfly4um.org/index.php/to....html#msg33571

A friend has done it with the 821.

Velco
Old 11-09-2013, 09:14 AM
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arshish1612
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Im not to keen on modding it...

Based on the prices ill take a decision between the following:

Option 1: 3 x 3010 for elevator and rudder + 2 analogue mini servos for ailerons (awaiting suggestions)
Option 2: 3 x spektrum 821 digital for elevator and rudder + 2 digital mini servos for ailerons (awaiting suggestions)

For power ill be using the built in sbec on the yep esc rated for 5.5v/6amps
Old 11-09-2013, 09:36 AM
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You will not be able to fit 3010 in the elevator halves, there you definitively need 13-15mm servos. For the ailerons you will need a standard size low profile servos and standard size servo on the rudder.

Velco
Old 11-09-2013, 12:15 PM
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arshish1612
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Ok.. Here is what it appears to be.

1. Wind 50E (219)
2. YEP 100A w 5.5v/6A SBEC (80A not available) (30.57) Weight 81g
3. SK3 - 5055-320kv (32.83) Weight 376g
4. Rudder & Aileron - Savox 1251 Digital MG x 3 (39 each) (116.97) Weight 133.5g
5. Elevator - HS 5245 Digital MG x 2m (26 each) (52) Weight 64g
Total (451) Weight 654.5g (Excluding Airframe & battery)
Total Weight with Zippy 40C 5000mah 6s : Weight 1488.5g

1. Does the weight seem ok?
2. This config use the built in SBEC rated at 5.5v/6A. I think this should be OK.. correct?
3. Is there any cheaper alternative to the SAVOX that will fit? If not ill go with this setup
4. Will try both a 17x10 & 17x12
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Last edited by arshish1612; 11-09-2013 at 12:26 PM.
Old 11-09-2013, 10:34 PM
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Jetdesign
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20C or 30C batteries would be lighter (and cheaper). Usually for pattern 20C is enough.
Old 11-17-2013, 02:17 AM
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bem
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Originally Posted by arshish1612 View Post
Thanks everyone decision made. Going with the 320kv and try the 17x12 to start.
I think APC 17x10 electric prop will be good to try also as You said. I use that on my Wind S 50E and Hacker A50-16S motor V2 (378 Kv). Works very good. I have flown mine for 3 seasons.

Maybe throw in a Scorpion Backup Guard also just in case - I use that on my larger Sebart MythoS 125E and it works great (I have been too lazy to mount one in my Wind S 50E, I have a Castle Creations Phoenix ICE 100 with BEC).
http://www.scorpionsystem.com/catalo..._Backup_Guard/


/Bo

Last edited by bem; 11-17-2013 at 02:25 AM.
Old 01-29-2014, 12:00 AM
  #20  
DrMotor
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I am very late to this party ... I have just seen a PM from arshish1612 ...
-There has been a great deal of very good discussion already

From my experience with the Angel 50: (a similar size and weight plane )

I would probably use: Turnigy SK3 - 5055-320kv (370g) $49.23 =29.70
http://www.hobbyking.com/hobbyking/s...ner_Motor.html
-with 16x8 prop

OR: FOR MORE POWER; I would use: Turnigy SK3 - 5055-430kv (370g) $49.23 =29.70
http://www.hobbyking.com/hobbyking/s...ner_Motor.html
-I would use a 15x8 or a 16x8 prop

OR: a slightly smaller motor: =HYPERION Z4025 12T 486 KV (346g) or even the 10-turn for even more power
Aircraft World are selling off the: Z4025 10-Turn 570Kv BackMount -at the moment - for $47.30 =28.54 (62% off)
http://aircraft-world.com/shopexd.asp?id=5612

They are ALSO selling the HYPERION Z4025 16T 368 KV off at the same price (62% off .. !)
http://aircraft-world.com/shopexd.asp?id=7257

This is EXACTLY THE SAME motor as: HackerA50-16 S, Kv 378,
Schweighofer LP-4025 /16T-385KV
Infinite A4025-370, 16T
Foxy C4025/16 385 Kv
Pilotage Nova Line DT4123/16 Kv378
APACHE APL41-16T 320 Kv
LipoTech GTA4520 -16 370 Kv, 16T
and probably O.S. OMA-5025 Kv 375

(They are ALL made, side by side, on the same assembly line, by the Sunray Technology factory ...)

Hope this helps, Dr Motor

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