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12-18-2003 04:17 AM  13 years agoPost 1
Gazoo

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Maryland

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Xbox, I read your posts. I would like for everyone who has purchased this motor to post the link where they bought it from, and whether you received a 6 V or 7.2 V motor. I am trying to find out what the differences are if any, or if they are indeed the same spec wise. Perhaps we can help each other to figure this out once and for all. NOTE: Any other brand other than Simprop does not count. Other brands have different specs. I purchased mine from here:

http://www.hobby-lobby.com/speed280.htm

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12-18-2003 06:43 PM  13 years agoPost 2
Silvashadow

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Kent, UK

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Xbox,

Have you got access to an acurate low range Ohmeter? If you have it may be interesting to see if the resistance across the terminals of the two motors is the same. I realise this is not sound engineering as the losses across the brush contacts will be different, but is might give us an idea if the 6V and 7.2V motors have different windings.

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12-18-2003 08:13 PM  13 years agoPost 3
webshot

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NorCal

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Gazoo,

I also got mine at Hobby Lobby 6v version.

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12-18-2003 08:41 PM  13 years agoPost 4
Bluesilver30

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USAF Academy, CO - USA

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http://pages.infinit.net/dlebrun/

that is the website of a guy from here who seems to know what works good. he uses a 6v. so whenever i go to upgrade i'll prolly get a 6v.

-Nick

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12-18-2003 10:06 PM  13 years agoPost 5
Gazoo

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Maryland

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I know ROT8 from the forums. As I recall I was one of the ones that recommended the motor to him. I still suggest that anyone who buys one make sure they get the 6V version. If anyone has the specs of the 7.2 volt, that would help.

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12-19-2003 09:11 PM  13 years agoPost 6
Silvashadow

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Kent, UK

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Gazzo,

Take a look at http://multiplexusa.com/motors/280bbsize.htm here they quote;

Typical operating voltage : 6 - 9V
No load speed : 30800 rpm
No load current : 0.7A
Current at max efficiency : 3.5A
Maximum Current : 8A

This is a 7.2V labelled 280BB

Would like to know the spec. of the 6V especially the typical operating voltage quoted. Remember that the Speed 300 6V has a quoted voltage range of 1.2 - 6V, I assume this would be similar for the 6V 280BB.

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12-20-2003 03:17 AM  13 years agoPost 7
Carlos2

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I bought mine at the LHS. It was labeled a 6 volt.

I got a data sheet with it in the bag. It is in German, so if anybody can read it, please translate:

Nennspannung: 7,2v
Betriebsspannungsbereich: 3,6 - 9,6v
Leerlaufdrehzahl: 24000 min
Leerlaufstromaunfnahme: 0,8 A
Stromaufnahme bei max. Wirkungsgrad: 4,8 A

Just a guess, but it seems like it might say it is a 7.2v, with possible the min-max the range just below it. This of course would contradict what the motor says. I don't see 6v anywhere on the spec sheet. I don't really get it (I guess it could be the wrong spec sheet)

Another point to add to the confusion, the second Acro 6v I bought had acceptable power, but I couldn't get it to fly for more than 4 minutes. If I recall, that is what one poster said about his 7.2v acro. I ended up using the new brushes in the old Acro and I got my flight time back to normal. Could it be that this new motor labeled 6v, was actually a 7 volt?

If the 6v and 7.2v were the same, why would the 7.2 v be so much cheaper?

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12-20-2003 05:38 AM  13 years agoPost 8
Gazoo

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Maryland

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Carlos2,
You and I have the exact same motor. Mine is labeled 6V like your's and my instructions are printed in German with the same electrical specs. If I use a the Altavista translater this is what we see :

Rated voltage: 7,2v
operating voltage range: 3,6 - 9,6v
idling speed: 24000 min
No-load operation: 0.8 A
power input with max. Efficiency: 4.8 A
I ended up using the new brushes in the old Acro and I got my flight time back to normal. Could it be that this new motor labeled 6v, was actually a 7 volt?
My thoughts exacty.
If the 6v and 7.2v were the same, why would the 7.2 v be so much cheaper?
That is the million dollar question. I have not been able to figure that one out.

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12-20-2003 05:48 AM  13 years agoPost 9
Gazoo

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Maryland

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Silvashadow,
As you can see the specs are close. What we really need to know is what is the RPM per volt of each of these motors. I do not think the Multiplex is the same as the Acro. The Acro is only labeled under the Simprop brand as far as I know. If we could only get someone that speaks German to contact Simprop, then we might be able to get something going with the company. Perhaps they would make an Acro designed for helis. I have gone brushless, but I loved the Acro and I plan on using it again with the Humming Board i a future project. I will still recommend it the way it is made now.

One thing that might make a big difference with the Acro would be to break it in under water as others have suggested. I didn't, but if I were to get another Acro I would try it.

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12-20-2003 06:59 PM  13 years agoPost 10
Heliaddict

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Belle Chasse, LA USA

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I don't know that bearings would survive as well as bushings with the water method so I just let it run for 30 mins on low voltage but still haven't got the b@lls to try to retime my new motor yet which I can tell by the way it runs it needs to be done.

Randy

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12-20-2003 07:27 PM  13 years agoPost 11
Carlos2

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Personally, I don't thing breaking the Acro in underwater would do much. I thought the purpose of that is to keep arcing down initially so it does not pit the brushes and cause fast wear. The brushes in the acro are almost perfectly mated to the commutator when new, so there shouldn't be that much arcing I would think.

Also, like heliaddict, I would be worried about the water getting into the bearings and causing some corrosion. I don't know if those bearings are sealed. Granted, it probably wouldn't seize the bearings or anything huge, but it could take a bit away from the smoothness the bearings provide.

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12-21-2003 01:57 AM  13 years agoPost 12
Gazoo

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Maryland

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One could always use distilled water. The reason I thought of it is because some have had good results with the Acro when they receive it and don't break it in while others have not. Eventually I will be ordering new brushes for my Acro and I will try the water method. But you did bring up a good point about using tap water. I did not think about that

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12-21-2003 05:17 PM  13 years agoPost 13
stubtoe

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Cheshire UK

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Gazoo
For what it's worth - installed the MPX 280bb in me HB(Sangami motor says so on the end cap) - the spec reads 6 to 8.4 Volts - motor lable reads 7.2/8.4 V - motor (re-timed for CW rotation ) pulls 2.9amps at 7.3 Volts (with fully charged birdseed running 10T pinion and cut down stock blades (3 to 7 mm ) not sure of the speed - me tacho does't seem to pick it up - note prior to recent re timing HB hardly got off the ground - still a raw beginer so that says nowt

Q's ~ should I get lift-off at 21.17 watts input
~ would increasing the cells to 8 help
~ 3s lipoly ?? ok
~ HB hovering head speed any idea

oh?! --- me thinks a manufacturer snot going to all the trouble to re-tool/rewind a perfectly good and most importantly an adaptable voltage rangeable motor which does the job in 99% of applications, where the motor is not run in the extreme - its only the likes of us folk in our illustrious hobby that end up pushing the envolope and developing/nurturing off the shelf equipment - so when you read 6volt read 6 to 8.4 volts
wyt
Joe

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