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Old Sep 30, 2014, 03:19 PM
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Need Insight on HET motors

Someone told me they were running a HET 3W20 on 6s. I haven't been able to find that motor, but would like to know how the HET naming convention works.

What does the first number and letter signify, e.g. 1W, 2W, 3W, and the second, e.g. 40, 30. 22. Any insight appreciated!
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Old Sep 30, 2014, 03:56 PM
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i read somewhere that the "w" is the winding count, the number after is the length but that didnt make since because HET made 2w with no number after. Not sure but the W is the windings
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Old Sep 30, 2014, 04:36 PM
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HET brushless EDF motors (28mm dia.) http://www.highendrc.com/index_ecat.php?cPath=8
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Old Sep 30, 2014, 06:13 PM
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W is the winding yes. As the number of winds goes up the kv goes down, as the length goes up for the same number of winds the kv goes down. For edf you want low resistance so you don't want to go too high on the wing count, 1 or two is best. So you make the core longer to get a lower kv on a low wind count which enables you to use more voltage.
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Old Oct 01, 2014, 04:19 AM
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The 2W was actually the 2W15, same original series as 3W15, 4W15, 5W15.

The second number refers to the length of the windings or rotor, so as Chris said longer can lower Kv for the same winds. For example:

2W15 = 4700Kv
2W20 = 3400Kv
2W25 = 2720Kv
2W30 = 2200Kv

Am sure you get the idea.
There is no 3W20, but there is a 3W25 and I run this motor on 6s in my Extreme Alloy CS12 blade fan combo, I have them specially made with 4mm shafts for my fans, I don't think anyone else has a 4mm shaft version. Its a great low amp setup especially for twins, sounds pretty hot too
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Old Oct 01, 2014, 08:46 AM
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As always, I get to say I learned something new today! Thanks
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Old Oct 01, 2014, 02:25 PM
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For ease of identification. The HET motor listings on our web store, state the KV with the part number, for all 28mm dia motors.
http://www.effluxrc.com/HET-1W-40-33...or-HET1W40.htm

The HET 650-800 series do have the KV stated as the last set of numbers in the part number.
http://www.effluxrc.com/HET-700-68-1...T700681400.htm
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Old Oct 01, 2014, 02:27 PM
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Thanks all! And thanks, Extreme_RC. Very nice explanation!
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Old Oct 01, 2014, 05:42 PM
Extreme CNC Alloy EDF
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No worries, what were you looking to set up? Or just curious about the 6s motor? 2W25 & 2W30 also run on 6s in various applications, and 1W40 is the long can super motor in the range that will run on 6s.

Just keep in mind the cell count is one thing, but end of the day your amp draw needs to be within the motors parameters regardless the cells used, so while a 2W25 might run on 6s in a wemotec minifan, it wont run on 6s in a CS10 or 12 blade fan, 4s is about its maximum there due to load.
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Old Oct 02, 2014, 06:03 PM
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Hi Extreme

Looking to emulate this performance, possibly.

http://e-rc.jp/eventPlane?epid=2300IWRlENhDhK4Wvqb

Think he is using a 3W25, not 20. Must be a typo.
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Old Oct 02, 2014, 06:37 PM
Extreme CNC Alloy EDF
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Yeah its a typo for sure, that's basically the setup I pioneered in our Alloy housings, first with the 10 blade rotor, then with the 12 blade. Look at this fan combo: EXTREME ALLOY CS12 6s 900W Combo

My combo pulls less amps than quoted in your link, very efficient setup with excellent thrust, and the sound is the best you will get from any 70mm fan, nothing can compete on that level with a perfectly set up CS12 rotor. Bear in mind pricing on my website is in AUD, so with the strong USD right now I believe the conversion is around 91-92c in the dollar. Means my fan will come in around 170 bucks.
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Old Oct 02, 2014, 11:27 PM
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Very cool. Yours is more efficient. This plane was designed for 4s, but a lot of people upgrade to 5s or 6s, as you saw from the link.

The extreme 70mm alloy HET 1W40 set up looks very cool too. More thrust. Is it much heavier than 220 grams? I wonder how that set up would work on the sabre vs. the 3W25 CS12 6s 900w combo?
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Old Oct 02, 2014, 11:53 PM
Extreme CNC Alloy EDF
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The 1W40 is amp hungry, it pulls 95-100 amps easily on 4s, not a setup I would choose for a regular flyer. The 3W25 is so much better when you work out the power to weight to amp draw. Another good setup is the new 2W27 on 5s, its a fairly hot setup with similar thrust to the 1W40 or 2W30 but more manageable amp draw.

Most of my 70mm are running the 900w 4s setup with 2W25, its more than enough power for a model up to 1.2kg, I flew a setup with similar thrust in a Lander panther at 1.6kg years ago, flew superbly.
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Old Oct 04, 2014, 08:12 AM
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Great insight. Thank you! What do you think of the 2W27 on 5s in a Habu 2? Is it a good set up for that plane as well?
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Old Oct 04, 2014, 01:59 PM
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It depends on what EDF your gonna use it in. With the E-f;ite Delta 15, you'd have less power than you currently do on 4s. (the stock E-flite motor is 3200kv)
The 2W-27 would be a 6s motor in the in the EVO fan. I would choose a higher kv motor and run it on 5s in the Habu 2.
What is your goal. Better sound? Better speed? I'll be out for the day, but shoot me an email for detailed suggestions if you like.
effluxrc@gmail.com

Here's the chart for your reference.
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Last edited by efflux RC; Oct 04, 2014 at 02:05 PM.
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