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Old Feb 11, 2008, 02:08 PM
Southern Pride
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Haralson County GA. USA
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Quote:
Originally Posted by Smiky
Truth be told the limiting factor for motors is how much heat they can dissipate.

Mike
But with low amps. there is little heat. Run a 500 watt motor prop at 100 watt using 10 volts and 10 amps.. Next run it at 100 watts using 20 volts and 5 amps. Next try 500watts using 20 volts and 25 amps. and last 10 volts and 50 amps..

Charles
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Old Feb 11, 2008, 02:56 PM
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Canada's East Coast, "An Ocean Playground"
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Quote:
Originally Posted by everydayflyer
But with low amps. there is little heat. Run a 500 watt motor prop at 100 watt using 10 volts and 10 amps.. Next run it at 100 watts using 20 volts and 5 amps. Next try 500watts using 20 volts and 25 amps. and last 10 volts and 50 amps..

Charles
..and if it survives the above, time to stand behind the shed and give her 100 volts at 5 amps .!!!

Bill
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Old Feb 11, 2008, 03:43 PM
Southern Pride
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Haralson County GA. USA
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The point I was trying to make is that volts does not mean heat. How many volts travel through the spark plug wires under the hood?
The trends is to higher cell counts / more volts and HV ESCs. Much easier to deal with higher voltage than higher amperage to get the same power.

Charles
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Old Feb 11, 2008, 03:57 PM
I do it cause it's FUN!
Oak Ridge
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Quote:
Originally Posted by everydayflyer
The point I was trying to make is that volts does not mean heat. How many volts travel through the spark plug wires under the hood?
The trends is to higher cell counts / more volts and HV ESCs. Much easier to deal with higher voltage than higher amperage to get the same power.

Charles
I understand the point you were making and I agree with you. If only battery pack were cheaper (regardless of chemistry) our choices would be so much easier. I'd much prefer to run a 6s pack at 1/2 ~ 3/4 the Amps and reap the benefit of extended pack life.

They're are and I think always will be trade offs and choices to be made regarding Efficiency/Cost/Weight, what works for one is not necessarily the best for others.

Mike (who hates making decisions)
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Old Feb 11, 2008, 06:05 PM
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Canada's East Coast, "An Ocean Playground"
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Quote:
Originally Posted by everydayflyer
The point I was trying to make is that volts does not mean heat. How many volts travel through the spark plug wires under the hood?
The trends is to higher cell counts / more volts and HV ESCs. Much easier to deal with higher voltage than higher amperage to get the same power.

Charles
..exactly my point..and why this year most of my 3S stuff will go to 4S..what an easy way to get a 40% power gain.

The thing to watch though is at what point the increase in motor rpm will bite you.

Bill
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Old Feb 13, 2008, 09:29 PM
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is scorpion working on any new more efficient motors? From what I read your motor can achieve max efficiency at 12volts...and under normal operating voltages that are common say 22.2 (6s lipo) only about 70%. This seems pretty low, or maybe im just spoiled by using kontronik inrunners which are about 89% efficient.
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Old Feb 14, 2008, 03:18 AM
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bladebogger,

I am not sure which motors you are refering to, but many of the scorpion motors achieve very high efficiency ratings.

Most of the 22mm series motors have peak efficiencies of a little over 80% when running on 3 Li-Po cells. The operating efficiency at max power output is around 70%.

For the 30mm motors, most of them have a peak efficiency of over 80%, with operating efficiencies in the 74%-76% range

The larger 40mm motor, when run on 4. 5 or 6 cells have a peak efficiency of between 88% and 89%, and have operational efficiencies in the 80-85% range depending on load.

The new HK-3026 helicopter motors have a peak efficiency of around 85-86% and operate above 80% efficiency over the entire useable power band of the motor.

Some newer developments at Scorpion will produce the next generation of outrunners that will operate at over 90% efficiency, rivaling the best inrunners.

Hopefully that clears things up a bit for you.

Lucien
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Old Feb 14, 2008, 04:05 AM
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Old Feb 14, 2008, 04:13 AM
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Hey,

im completely new to scorpion motors and have heard some great things about them.

I am about to put a scorpion 3026-10 motor with 70amp esc running a 14x7e prop on an Aj Extra 330s made by Fliton.. Im sure you all know the one! Im running it on thunderpower extreme 2200mah 11.1 3s!!!

Will let you all know how it goes! Should be better than the hacker recommended setup from what i've heard!

Mickey blue eyes!
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Old Feb 14, 2008, 07:56 AM
Das Universus Elektrikus
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NM, USA
Joined Mar 2002
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Quote:
Originally Posted by bladebogger
is scorpion working on any new more efficient motors? From what I read your motor can achieve max efficiency at 12volts...and under normal operating voltages that are common say 22.2 (6s lipo) only about 70%. This seems pretty low, or maybe im just spoiled by using kontronik inrunners which are about 89% efficient.
Mr Bogger,

I'm using a 4025-10 as a replacement for an Actro 32-2 Heli which is rated at 89% max efficiency. I'm getting similar flight times and slightly better power from the Scorpion and it weighs 2 ounces less and costs about a third.

Any word on when the 4035s will be available Lucien??

Al
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Old Feb 14, 2008, 08:53 AM
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South Africa, GP, Pretoria
Joined Jul 2003
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Quote:
Originally Posted by Albig
...Actro 32-2 Heli which is rated at 89% max efficiency.
It is futile to even look at Max. efficiency ratings, since the motor will never achieve that under load. So, I wouldn't recommend choosing a motor based on that.
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Old Feb 14, 2008, 09:35 AM
Das Universus Elektrikus
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NM, USA
Joined Mar 2002
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I'm not recomending the 32-3. I'm giving a comparison of the Scorpion which has lower adveritsed efficiency than what is the most popular large helicopter motor. But it performs at least as well.
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Old Feb 14, 2008, 09:52 AM
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Lucien , I am using two Scorpion ESC's joined together with a "Y" connector as you suggested , the set up is working fine , my question is , does this set up allow the use of more servos ?

Two Scorpion 15 amp ESC's with a Thunder power 3S2100 battery.
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Old Feb 14, 2008, 10:02 AM
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Old Feb 14, 2008, 11:42 AM
Flying motor mount master
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San Jose, California, United States
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I forgot to mention the successful flight of PaulVi's 36" Demon with a newly wound 3014 motor that didn't burn up at all. It ran right at 575 Watts with 4S and came down nice and cool and I even temped the windings which came out luke warm. How does a 7x7 prop sound?

I'm very confident that this setup can take 5S and it can probably take 6S with the appropriate prop and stay below 800W.

I've never seen a wing go straight up at 1/2-3/4 throttle and show no signs of slowing down:
http://www.rcgroups.com/forums/showt...684818&page=72


B
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