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icanfly

Elite Veteran

ontario

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How much longer will a lipo last under one charge if the motor sees no load, in percentage?
There's some mathematics here that would make things complex but we want to avoid that. Much more simply if a typical 2200mah 11.1v 3c lipo in a 450 (1.75lbs) powering a 3500kv motor lasts 5 minutes, minus blade and pitch drag while hovering. How much longer will the same used mah last without a load on the motor?

Amperage is a result of demand, increase that and the lipo drains quicker. The motor should have a basic no load amperage to spin it. A motor without a load may be capable of 1hp (><750watts) but your not going to use anything significant to spin the can alone and the consumption rate of electricity is minimal. Brake the motor with a constant load and it will need to tap into it's fullest potential. It's like saying a 700 with a lot of drag opposed to one with no drag, will burn a lipo off if it could extract all the mah from a lipo in the shortest time possible where-as one without any load at all would sip e from the lipo needing only enough to spin the can and the soc would last a very long time.

Some guys don't charge their lipo until they are ready to use them, keeps the lipos much safer from incident also as a non charged lipo is much less apt to destroy itself in a spectacle without the additional charge, We've injected electricity into a storage medium and when we hook up that e wants somewhere to go, just how quickly we tap into it determines the time that extra state of charge lasts and how the system can extract it without destroying something.

None of this has to make sense if you don't want it, many people around me think I'm an idiot because I fly and play with little toys, sure, except I'm dabbling with physics and design and exploring much potential.

Future plan is to 3d a scale heli, a big one, a Mil24 maybe, something scale, that'll show them not to snicker behind people's back, lol.

I think I smell nitro.

06-21-2016 11:47 AM
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rpat

Elite Veteran

Weirton, W. Va.

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After all of that..........what is the question,problem,solution....please pick one of the above.

trex 700fbl cal30,minititan,lepton, trx600fbl,mcpx,trex250,logo 500,Velocity N2

06-21-2016 12:49 PM
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jake21

Senior Heliman

ontario canada

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Is Colorado in Canada now?

The only way to not crash is up

06-21-2016 01:38 PM
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Doublah

Veteran

USA

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Ummmm, ok!

06-21-2016 02:12 PM
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ICUR1-2

Key Veteran

Ottawa, Ontario

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News Flash
Canada to become like Colorado in about a year
He was Colorado before Colorado

spending time, paying attention

06-21-2016 02:20 PM
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ICUR1-2

Key Veteran

Ottawa, Ontario

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I think he wants know the formula for Watts require per lbs

spending time, paying attention

06-21-2016 02:23 PM
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GREYEAGLE

Elite Veteran

Flat Land's

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a Watt is Horsepower so how many horse's do's a Watt weigh ?

Thought it was Boyle's Law for putting the smoke in

Learned that from Mr. Every- Ready Current

It's got too do with them Jelly Fish Pill's !

greyeagle

06-21-2016 02:36 PM
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Richardmid1

rrProfessor

Leeds, England

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I know some motors give you a no load current draw at certain voltages. A Scorpion HK4025 1100kv for example pulls 3.19A at 10v, it's a hungry little bugger!

So lets say that motor pulls 4A at 22-25v it would go for 1 hour with a 6s 5000 pack (4Ah used).

60% of the time, it works every time!

06-21-2016 03:19 PM
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icanfly

Elite Veteran

ontario

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put that in your pipe,,,,

Thanks Richardmid1 your info is generally what I was hoping to get toward.

A recent insight and application resulted in a 150% plus and the result has to be looked at backwards to assert the finding mathematically.

Otherwise keep the cracks coming, all in jest of course. Who gets the last laugh?

Greyeagle, how many horses does it take to lift a watt? How many watts to lift a horse/lb/ft, square even, lol.

nobody says it was going to be easy.

06-21-2016 03:46 PM
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Richardmid1

rrProfessor

Leeds, England

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Ha I love trying to decipher your posts but im stumped again!

60% of the time, it works every time!

06-21-2016 03:49 PM
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icanfly

Elite Veteran

ontario

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shhhhhh,

quiet on the set,,,,,,

Roll em,,,

aaaaaand,, ACTION,,,,

_______________________________________________________

Anyone see the recent Pepto Bismol ad with a pink rc Chinook?

06-21-2016 03:51 PM
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RM3

Elite Veteran

Killeen, Texas - USA

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first off you need to determine how high it is off the ground, basically its potential energy due to the the hieght off the ground (where it took off from) and since its the same for joules you can use:
PE = mgH (Potential Energy = mass * g * Height), where g = 9.8m/s^2 is the acceleration due to gravity
consider joules as PE....

now how fast the heli rises in the air to a given height has to be calculated as well so you'll need to solve for:
P = W / t (Power in Watts = Work in Joules * time in seconds)

Then once you have that you can get hp using:
1 horsepower = 750 Watts

done...

Now stop trying to figure this crap out...reminds me of all the scientists studying black holes and the center of stars, like its going to gives us something tangible in return and pretend they are correct when they cant even get there...pointless work with no ROI.

showing a preference will only get you into trouble, 90% of everything is crap...

06-21-2016 03:56 PM
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jake21

Senior Heliman

ontario canada

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After you figure it out without a pinion while the heli is not airborne.
Could you please figure it out without a pinion while it is airborne. Please.

The only way to not crash is up

06-21-2016 04:16 PM
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icanfly

Elite Veteran

ontario

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lol, this could be taken down a very dark path, like pinions to minions of grunions with bunions who et onions while trunions of ninians crud scanions of manions, to wit come poop, lol.

had a little moment of fun there.

Back to real nuts and bolts, if it takes 4A just to saturate the stator into spinning the can with so and so many ounces of metal from the example Richardmid1 offered, multiplied by a factor of ten for instance would suggest how much hp was being used to drive the rotors. Then adding a load by hovering would first reveal how much drag on the system there was, then how many amps would be needed to do a hard pull out or tic toc for instance.

I'll add just by re-soldering on a closerer fitting and better soldered connector on my x450 the amount of heat from motor , wire, esc, and lipo dropped when checked after a hard directional stop filled flight yesterday.

I'm really disillusioned by the incredibly short flight times of e 700's doing 3d, less than 4 minutes is that worth it?. I said I smell nitro (or gas). My overhauled and reiterated Shuttle nitro got 15minutes the last time it was flying a few weeks ago. It was certainly not as supercharged as a new e model like my 450 pro but it went good with a few shinning moments.

Following up on a personal challenge to introduce a 200mph heli, of which I have many parts to realize that challenge and much know how, stomping E flight times are abysmally short however. Not so much how many ponies but how they are used and how long the booster juice lasts.

06-21-2016 05:28 PM
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icanfly

Elite Veteran

ontario

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I'm surprised no one mentioned using an esc with data logging, jeesh, I got 3.

doh

06-22-2016 12:06 PM
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