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HomeAircraftHelicopterMain Discussion › Brushless RC Generator system
11-19-2011 09:54 AM  6 years agoPost 1
vic88my

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Malaysia

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Dear buddies,

It is Mr Lee here. May I know any methods to prolong the running time of brushless battery ?

One alternative is to use a brushless motor powered generator to charge the batteries ? Viable ?

Any other options ? Nowadays the greatest mah is 12000 mah. Max out abot 20 mins of Helicopter flight.

Thanks

Regards,
Prof Lee

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11-19-2011 10:33 AM  6 years agoPost 2
McKrackin

rrProfessor

Lucasville,Ohio

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You're talking about perpetual motion type generator and it doesn't work.

The BLS motor you use as a generator would actually pull juice from the pack instead of putting it back.

That method works for nitro or gas helis but can't be done for electric.
You could charge the RX pack but no way to get ahead of the flight pack.
The flight pack would die faster supplying power to two motors.

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11-19-2011 05:39 PM  6 years agoPost 3
dkshema

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Cedar Rapids, IA

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One alternative is to use a brushless motor powered generator to charge the batteries ? Viable ?
Not feasible. It takes more energy to charge the battery than you expend trying to charge it as energy conversion is not 100% efficient. Simply put, you can't use a battery to charge itself.

Perpetual motion machines do not exist. They also cannot exist, the nasty laws of thermodynamics keeps poking its ugly head up.

If you want to prolong run time on your battery, you have two choices..

1) larger capacity battery

2) reduce the power consumption of the system that you are providing power to.

1 -- larger battery has its own problems. The added weight of the material in the battery to give the extra capacity requires additional power from your system to keep it aloft. Bigger isn't always better.

2 -- experiment with motors, speed controller settings, gearing, overall weight you're trying to lift, blade airfoil design, and reducing drag to optimize your flight time. Don't be surprised to find that you lose performance as you gain flight time.

I guess I'm not sure why you're trying to get 20 minutes or more flight time with a heli, anyway. Perhaps THAT is your problem.

In an earlier post you ruled out the use of any liquid-fuel based power system and seem only willing to consider electric power. In doing so, with the current technology, you have limited your flight time severely.

If you really want lots of flying time, go with a large gasser (gasoline, not nitro/alcohol) having a large fuel tank.

Keep in mind that even if you can keep the motive power system alive for an extended period of time, you still need to make sure your electronics power system doesn't die out on you.

-----
Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz

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11-19-2011 05:55 PM  6 years agoPost 4
AirWolfRC

rrProfessor

42½ N, 83½ W

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Simply put, you can't use a battery to charge itself.

Perpetual motion machines do not exist.

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11-19-2011 11:57 PM  6 years agoPost 5
jschenck

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La Vista, NE.

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Does work well on a gasser though!

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11-20-2011 12:35 AM  6 years agoPost 6
Justin Stuart (RIP)

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Plano, Texas

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Prof Lee

Just curious, but exactly what kind of professional schooling have you received? Not wanting to be disrespectful, but since you sign your posts as "professor", your questions make me want to know what sort of Ph.D. or other doctorate you have obtained.

If you've got a Ph.D. in philosophy or history, then all is cool. But if your a professor of physics or chemistry or one of the other hard sciences, then I suspect that something might be amiss here.

Avant RC
Scorpion Power Systems
Thunder Power RC
Kontronik Drives

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11-20-2011 01:04 AM  6 years agoPost 7
Riq

rrKey Veteran

ND

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I have it..quantum sub-space nanoparticle reactors?

Ill be the new Szabstein rockin 800s on molecules.

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11-20-2011 03:32 AM  6 years agoPost 8
McKrackin

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Lucasville,Ohio

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Why is there even a question between hard science and theoretical guessing?

This one can be proven and this one looks good on paper?

Theoretical science should have a time limit.
Prove it or move on

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11-20-2011 03:44 AM  6 years agoPost 9
drdot

rrElite Veteran

So. California, Orange County.

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fwiw..
"Theoretical science should have a time limit."
Nah....Economics is a "science"....Look at all the fun we have with that one!....

John.

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11-20-2011 05:33 AM  6 years agoPost 10
dkshema

rrMaster

Cedar Rapids, IA

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Mr. Schenk....don't confuse our poor Professor....

Your generator system works well to keep the FLIGHT pack electronics and its separate battery very happy while flying. But, you leave out the fact that this cool little gem is run by either a nitro or gasoline powered motor.

Once THAT motor stops turning (out of gas, for example), so does the generator and you no longer have any power except that coming from the on-board battery pack.

You can't do the same thing with an electric-powered heli to recharge the battery that provides power to the motor.

Maybe after not wanting to use liquid fuel, and having had his electric power bubble burst, our Professor may want to consider the use of small, furry animals, wheels, and belts, as a viable, earth-friendly power source.

-----
Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz

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11-20-2011 06:23 AM  6 years agoPost 11
jschenck

rrProfessor

La Vista, NE.

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perhaps a bio-diesel option would satisfy? CNG? Tethered to a windmill?

or an external combustion engine (steam power)

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11-20-2011 03:24 PM  6 years agoPost 12
cudaboy_71

rrElite Veteran

sacramento, ca, u.s.

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perhaps if we built a large wooden badger…

if it ain't broke, break it.

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11-20-2011 05:35 PM  6 years agoPost 13
GyroFreak

rrProfessor

Orlando Florida ...28N 81W

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It is simple:
Use a generator to drive a high voltage converter whose output will be used to disassociate hydrogen oxygen from water, then combine the gas in a rapid chemical reaction combustion chamber to heat water into steam to drive the steam turbine. The turbine output will drive a binary reaction fluid osmosis transmission which coupled with a gravity wave logarithmic collector,spinning a quadro-magnetic flux hydrodyne motor thus driving the generator again. A recidivating amalgamated neuron coupler will be used to tap the energy and feed it to the main rotor's rotary valveless by-pass elctro forced reactive magnetic energizer.
.
Crap, I need to get out more and fly.

I think about the hereafter. I go somewhere to get something, then wonder what I'm here after ?

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11-20-2011 05:40 PM  6 years agoPost 14
rexxigpilot

rrProfessor

Florida

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^ now that's funny!

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11-20-2011 06:19 PM  6 years agoPost 15
dkshema

rrMaster

Cedar Rapids, IA

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perhaps if we built a large wooden badger
I like that...

-----
Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz

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11-20-2011 11:27 PM  6 years agoPost 16
drdot

rrElite Veteran

So. California, Orange County.

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fwiw...

OOOOOHHHH....Small furry animals...!..Heh! Heh! Heh!

John.

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