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Old Oct 29, 2012, 08:35 AM
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Quote:
Originally Posted by Tahoe Ed View Post
I got on of these and it works really well. The alarm will wake the dead.

http://www.rcdude.com/servlet/the-24...Voltage/Detail
I have 3 of those alarms and they are LOUD! someone called the cops on me when mine went off and I got a Disturbing the peace fine!
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Old Oct 29, 2012, 08:39 AM
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T J Gilbert's Avatar
United States, MS, Ridgeland
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Motor Voltages

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Originally Posted by seadog1967 View Post
Just to let you know those 980 of sunnysky like I got are suppose to be only 3s which I run but my friend in AZ is running them on 4s with no issues. He also prior to the sunnysky ran $40+ motors. Says he likes these. No heat issue etc. Japan bearing and kawasaki stators so I think are ok. Was running a 1700g quad with them no issues.
I've been trying to educate myself on adhering to recommended voltages, vs. running a 3S motor on 4S, for example.
From what I can see, this is where the power calculators come into play.
As long as you don't overload your 3S motor & ESC with 4S (and the other parameters such as prop, AUW, etc. are within the limits a power calculator sets), you can proceed with care.
Actually the determining factor is the watts that your motor can handle.
That "magic" number is ~ 3W/g.
And P=ie.
Go over that and the heat demon comes calling...
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Old Oct 29, 2012, 08:44 AM
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Quote:
Originally Posted by T J Gilbert View Post
I've been trying to educate myself on adhering to recommended voltages, vs. running a 3S motor on 4S, for example.
From what I can see, this is where the power calculators come into play.
As long as you don't overload your 3S motor & ESC with 4S (and the other parameters such as prop, AUW, etc. are within the limits a power calculator sets), you can proceed with care.
Actually the determining factor is the watts that your motor can handle.
That "magic" number is ~ 3W/g.
And P=ie.
Go over that and the heat demon comes calling...
I have ran 4s on my F450 now for some time with no trouble. The motors stay cool and responce is much quicker with the 4 cell than the 3
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Old Oct 29, 2012, 09:52 AM
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United States, MS, Ridgeland
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Fwiw

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Originally Posted by goldsworthy View Post
I have ran 4s on my F450 now for some time with no trouble. The motors stay cool and responce is much quicker with the 4 cell than the 3
I started out with 4S, and have never considered 3S...
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Old Oct 29, 2012, 10:22 AM
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United States, MS, Ridgeland
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I Did Something Stupid...

I'm putting LEDs on the airframe of the F550 I'm assembling.
As you probably know, the LEDs are clear, and unmarked as to color.
To see what color one was, I forgot and hooked it to 4.8v without a resistor in series.
Blew it out straight away.
I must really be getting old!

Didn't have but one in that color, so now I have to wait for a replacement...
Lesson for TJ: Order more than one of things that are cheap to prevent a dime holding up a dollar..
I can hear GW laughing...
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Last edited by T J Gilbert; Oct 29, 2012 at 10:28 AM.
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Old Oct 29, 2012, 10:39 AM
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United States, AZ, Tucson
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Quote:
Originally Posted by T J Gilbert View Post
I'm putting LEDs on the airframe of the F550 I'm assembling.
As you probably know, the LEDs are clear, and unmarked as to color.
To see what color one was, I forgot and hooked it to 4.8v without a resistor in series.
Blew it out straight away.
I must really be getting old!

Didn't have but one in that color, so now I have to wait for a replacement...
Lesson for TJ: Order more than one of things that are cheap to prevent a dime holding up a dollar..
I can hear GW laughing...
So, what color was it?
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Old Oct 29, 2012, 10:43 AM
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Originally Posted by T J Gilbert View Post
I started out with 4S, and have never considered 3S...
I am running 3S on both 450 and 550 because that is what I have. My machines are pretty much at the upper weight limit. Both have more than enough "performance". The motors all usually run around 80F when I land either machine, plus or minus a few degrees. Personally I like the "look" of bigger props and I also like the fact that they are turning at a lower RPM.
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Old Oct 29, 2012, 10:44 AM
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And The Color Is...

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Originally Posted by goldsworthy View Post
so, what color was it?
red
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Old Oct 29, 2012, 10:44 AM
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Originally Posted by T J Gilbert View Post
red
I am glad we got that cleared up!
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Old Oct 29, 2012, 11:04 AM
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Red = Most Sensitive

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Originally Posted by goldsworthy View Post
I am glad we got that cleared up!
It turns out that the red LED is the most sensitive to burnout without a current reducing resistor.
Just my luck.
A quick connection straight to a battery didn't hurt the green and white LEDs...

Maybe someone else will benefit from my carelessness...
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Old Oct 29, 2012, 11:57 AM
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Originally Posted by T J Gilbert View Post
It turns out that the red LED is the most sensitive to burnout without a current reducing resistor.
Just my luck.
A quick connection straight to a battery didn't hurt the green and white LEDs...

Maybe someone else will benefit from my carelessness...
These are the strips I am adding to my F450 some of them have RGB controllers installed- http://www.youtube.com/watch?v=X92-p...2&feature=plcp I have a large box FULL of these LED packs
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Old Oct 29, 2012, 12:37 PM
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LED Strips

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Originally Posted by goldsworthy View Post
These are the strips I am adding to my F450 some of them have RGB controllers installed- http://www.youtube.com/watch?v=X92-p...2&feature=plcp I have a large box FULL of these LED packs
I remember us discussing them.
I have some of those on an old quad.
The good thing about them is that they have a resistor built into the strip to protect you from what I did...
I'm presently working on some really bright, individual LEDs...
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Old Oct 29, 2012, 12:42 PM
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I am going to try and fit 40-50 of theseLEDs on my 450. I wish to power the strips from a seperate battery. at 11.5 volt rating what model lippo would be smallest and lightest in size (3 cell) to be able to run these strips at full brightness for at least 1 hour?
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Last edited by goldsworthy; Oct 29, 2012 at 12:50 PM.
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Old Oct 29, 2012, 01:00 PM
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Originally Posted by goldsworthy View Post
I am going to try and fit 40-50 of theseLEDs on my 450. I wish to power the strips from a seperate battery. at 11.5 volt rating what model lippo would be smallest and lightest in size (3 cell) to be able to run these strips at full brightness for at least 1 hour?
You need to know the current they pull. Whatever that is, thats the size in mAh you need. Example: if they pull say .02 amps each, and you have 50, that's 1000 mA, so you would need that size battery to run them for an hour.
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Old Oct 29, 2012, 01:22 PM
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Originally Posted by Cervanchez View Post
You need to know the current they pull. Whatever that is, thats the size in mAh you need. Example: if they pull say .02 amps each, and you have 50, that's 1000 mA, so you would need that size battery to run them for an hour.
So I have this battery brand new I never got around to useing for anything. It is only a 1C rated lippo but it could be enough?-http://www.hobbyking.com/hobbyking/s...idProduct=9787 I realy dont know what the strips take other than they are rated at 11.5 volts
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