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Old Mar 29, 2009, 05:03 AM
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ARC Motors in 69mm Het Fan

Hello,

I read a lot of Threads about the ARC Motors,but I dont find what I need (or I have not read enough )

I want to know the spezifications running the ARC 28-47-1 in Het Fan with 4S and 5S.

I need RPM,Thrust and Amperes at static Run.

Has anyone tested that ?


I have a ARC 28-48-1,5 too.

I dont find this Motor on ARC Page.I only find the ARC 28-47-1,5.

What does it mean that my Motor is a "48" ?


Jörg
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Old Mar 29, 2009, 05:09 AM
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Contact Tailslide 5.0 He uses these very often. He can help you with exacts!!
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Old Mar 29, 2009, 05:53 AM
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I don't know about 4&5s but on 3s 4000 20c my ARC 28/47/1 does 55 amps @ 600 watts in my HET fan.
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Old Mar 29, 2009, 06:15 AM
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4s is around 1300-1400 watts and I think on 5s its close to 2kw but real high amps..over 125!!
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Old Mar 29, 2009, 09:09 AM
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Never heard of the 28-48-1.5. Just the -47-. Which I have two in my CFM f-15. The 28-47-1 is a hot mtr. I have it in my enlarged Berkeley Crusader. But using a Mini fan- Pro, the load is lower than the HET. I getting a little higher nimbers than ocean, @ 58A/650W on a 3s PQ 3700XP. This may be due to having the CC 80 timing at mode 1 full advance. I tried a 3300XP 4s and got 70+A at just over 1100W.

The 4s was not needed, so I went with the 3s and more duration. Still the Crusader does a good 90mph approx. But at power levels under 750W the HET will probably out perform the Pro. But at higher currents. This is only what I have read. I prefer to stick with the Minifan. From my understanding. it can handle higher watts. Maybe someone can verify this further, or debunk it.

Fuzz
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Old Mar 29, 2009, 09:17 AM
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Quote:
Originally Posted by SMR850

What does it mean that my Motor is a "48" ?


Jörg
ARC numbers are the case size, with the last numbers the number or turns. Mega uses rotor size for the first two numbers, As: 16/25, 16mm dia, 25mm length. ARC is 28mm case diam,47mm length. Both motrs same external size.

Fuzz
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Old Mar 29, 2009, 11:36 AM
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Has anybody used the arc 28-58-1? On the site (http://www.lightflightrc.com/ right on the center of the page) it says that they are made just for the 70mm fans.. they have a slightly lower KV than the 47 of course but that means it can probably run on 6 cell lipo... i dont think you can get much crazier in a 70mm fan....
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Old Mar 30, 2009, 04:10 PM
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Quote:
ARC numbers are the case size, with the last numbers the number or turns. Mega uses rotor size for the first two numbers, As: 16/25, 16mm dia, 25mm length. ARC is 28mm case diam,47mm length. Both motrs same external size.

Fuzz
I know this.....

What I mean is,that nowbody than me has a 28-48-1,5

How many RPM has this Motor,and why does Nowbody know it ?


I want still know how many Thrust has the 28-47-1 in HetFan on 4S and 5S ?



Jörg
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Old Mar 30, 2009, 04:28 PM
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Can't help with the thrust numbers but I just put an arc 28-47-1 in a HET 6904 housing with a wemotec rotor. Were seeing about 70A and 950 - 1000W on a 4s 3200 XPS pack.

Hope that helps.

Don
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Old Mar 30, 2009, 05:19 PM
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Don, I have to wonder if the Wemo rotor is as efficient, in the HET shroud, as in the WeMo shroud. And the same for the HET rotor/in a wemo shroud. You can have all the watts in the world, but if the flow straiteners/vanes, do not match, then it has a degree of waste. Of course, if it works for you, then it is not an issue.

Jorg, thrust should not really be an issue, unless you plan on trying to obtain vertical climb from release of your hand. You can have 1-1 thrust, and not go very fast. Just climb indefinetly. Efflux speed is what gives speed. Good ducting with intake FSA of 95-100% and exaust of 80-85% will give awesome speed. If the airframe design and weight can use it.

Can you show a pic of the "48" mtr next to a 47? It seems strange that they would tool a new mtr for 1mm can/rotor length. Ofcourse..if the rotor is still the same length as the "47", than nothing is really accomplished. It could be a mis-print on the mtr. Could you measure the can?

Fuzz
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Old Mar 30, 2009, 08:29 PM
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I am also curiouse about the 28-58-1. I heard mention of it in the arc 28mm thread, but not too much info at all. im kinda ready to buy an arc motor for a 70mm project but i dont really understand the difference. I think someone said that its a little milder of a motor than the 47 but not as mild as a 1.5 motor. Any help?

CJG
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Old Mar 30, 2009, 10:48 PM
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The 28-47-1 is a 4s and if your crazy enough 5s motor tops it is a 4,250 kv motor and will pull some amps but put out big power.
The 28-58-1 is a 3,180kv motor and is intended for 5s to 6s use. It will pull less amps than the 28-47-1 but still put out huge power. The down side is you will need more cells. So its up to you as both are big power houses. The 28-58-1 is also a longer can motor at 58mm long so it will dissipate heat better. the 28-47-1 is a 47mm long can motor. Both should use heatsinks.
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Old Mar 31, 2009, 01:50 AM
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I could not have said it better!
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Old Mar 31, 2009, 08:56 AM
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Thanks, thats the best explanation I have seen. Sounds like from those two KV ratings, that the 28-47-1 on 5s might still be the biggest power house, but im sure that combo pulls some major amps. Ill probably just have to buy both and do my own testing. Thanks for the info.

CJG
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Old Mar 31, 2009, 11:04 AM
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Here is some info for a 4s..

HET 6904
ARC 28-47-1
TP 4s 3300 30c

This is on a heavy F22 raptor, Flying weight around 42 onz.. Still gets pushed at a max speed of 109 mph on this setup..

Usually around 100 amps..
1400 watts..

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