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HelicopterMain Discussion › Longer Flight Time?
12-07-2017 04:45 PM  6 days agoPost 1
mcfast

rrKey Veteran

Quebec Quebec Canada

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Hi, Guys, I am building a 700 electric low head speed heli using one 5000ma
battier, what is a better setup for a longer flight time, running all the servos and assures off the main battier or installing a separate flight pack, let say a 2200ma.

P.S. sorry for the spelling or the grammar I am dyslexic!

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12-07-2017 04:48 PM  6 days agoPost 2
wrongler

rrProfessor

Brewerton, New York

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Opinion only, the weight of the extra flight pack is worse than running all off the main flight pack.
Im sure someone will have different ideas.

Bill Whittaker

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12-07-2017 05:28 PM  6 days agoPost 3
RM3

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Killeen, Texas - USA

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depends or your risk tolerance..

If you run everything off the main pack... you have less to go wrong... but you are dependent on that one pack... if your running high draw servos and are hard on the sticks... your taking away from your flight time, not alot but Im sure its measurable

adding another pack to run the RX system is going to add weight... and that takes more power to lift... So... that spills more electrons to lift the extra pack...

all in all, Either one will not be much different. the right gearing and servo selection suited to your goals will be where you want to work with.

weight, efficiency of components and flying style are the game you play when it comes to flight time

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

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12-07-2017 05:30 PM  6 days agoPost 4
Pistol Pete

rrProfessor

Seffner, FL

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Good question.

More weight reduces flight time while reducing head speed increases it.

We know that doubling your main batt will not get you twice the flight time.

Adding a batt to spare the main from feeding the electronics will add flight time but how much?

Also, how much more flight time (15, 30, 45 seconds?) is it worth to you having to charge a second batt and how often?

Keep in mind that depending on servos used as well as flying style, the electronics can "peak" to maybe 4A during extreme maneuvers, so a flight only consumes between 300 to maybe 400mA (doubtful) at most.

IF you already have the batt for the electronics, you can experiment to find your happy medium.

~~Enjoying the hobby one flight at a time~~

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12-07-2017 06:20 PM  6 days agoPost 5
mcfast

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Quebec Quebec Canada

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I am not hard on the sticks, mostly Scale flying.

P.S. sorry for the spelling or the grammar I am dyslexic!

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12-07-2017 06:46 PM  6 days agoPost 6
Heli_Splatter

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USA

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I would like to suggest the use of a tool such as eCalc to determine these issues. We can only do theoretical calculations to determine such values. Actual will be different.

https://www.ecalc.ch/

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12-07-2017 07:11 PM  6 days agoPost 7
Flyin for Jesus

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Dana Point, Ca. 92629

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My Goblin 770 draws about 1A continuous from the BEC of my Kosmik ESC.
Can't imagine that would have any impact on flight time if drawing from the main pack.

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12-07-2017 07:38 PM  6 days agoPost 8
ssmith512

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Indianapolis, IN USA

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2 biggest factors for increasing flight time are by far overall weight and headspeed. Lower both as much as you comfortably can and you will increase flight times.

If you are not doing hard 3D smack and are not heavy with the sticks (lots of pitch input), then I would forgo using a separate RX pack and use the BEC off the ESC. I use the Hobbywing BEC on my practice bird (stretched E5) and getting 9 minute flights easy on a 5800mAh pack using only 70-72% battery capacity.

Steve

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12-07-2017 10:00 PM  6 days agoPost 9
ICUR1-2

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Ottawa, Ontario

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Although I agree with sharing the flight battery I would make certain the BEC can support your needs.

I no longer trust castle internal BECs ...
Just be careful.

spending time, paying attention

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12-08-2017 02:37 AM  6 days agoPost 10
Gearhead

rrMaster

Vt

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you can get longer running times by buying higher quality, higher tolerance bearings for all shafts that are powered by your motor,, these bearings turn much smoother, they will also put more power to the main and tail shafts that will intern give you more time if you are easy on the power stick, they will also smooth-out your heli in the air,, but note this will cost you

Jim
Buzz Buzz Buzz

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12-08-2017 04:01 AM  6 days agoPost 11
EEngineer

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TX

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Watch at YouTube

Logo 600SXs, 800XX, TDR IIs

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12-08-2017 04:16 AM  6 days agoPost 12
MDSCUSTOMS

rrApprentice

North Wales, U.K.

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Go glow or Nitro, you will have a decent sized tank for about 15 to 20 mins flight (depending on size of your machine and your style of flying) You can then land and even top up the tank whilst the engine is still ticking over.

Try doing that on an electric Heli

Mark.

I'm only here coz I'm not all there !!

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12-08-2017 04:30 AM  5 days agoPost 13
Jamovich

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Bangalore, India

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No unfortunately you can’t top off a heli with a YS engine whilst it is running...

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12-08-2017 04:44 AM  5 days agoPost 14
EEngineer

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TX

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Try doing that on an electric Heli
What Jam means....and he's correct...is that a YS engine uses a pressurized fuel system.

And you cannot release pressure to re-fuel....or the YS engine will quit.

In addition to other things.....
Try doing that on an electric Heli
As much as I might try that on an electric heli....there will be no fuel spills whatsoever.....

Logo 600SXs, 800XX, TDR IIs

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12-08-2017 05:14 AM  5 days agoPost 15
Ace Dude

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USA

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Go here and read all the excellent posts from Gary Wright on the subject:

https://rc.runryder.com/helicopter/f177p1/

  

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12-08-2017 07:46 AM  5 days agoPost 16
EEngineer

rrProfessor

TX

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That an electric heli doesn't spill fuel?....

Seems obvious...

Logo 600SXs, 800XX, TDR IIs

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12-08-2017 02:18 PM  5 days agoPost 17
RM3

rrElite Veteran

Killeen, Texas - USA

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I can swap out the main pack on my 600e faster than I can fill a 10oz tank... it has a separate rx pack...

BTW I never turn off my gasser when re-filling...

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

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12-08-2017 02:28 PM  5 days agoPost 18
gwright

rrVeteran

Champaign Il

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Having done both,.. i use BEC's in everything, and avoid a seperate radio battery like the plague. As for flight time differences, i couldn't reach a significant conclusion as the 10~30 seconds difference in various flights was more than the difference in using the main pack vs seperate pack. Weight differences balanced out the capacity used for the electronics.
however,.. with all that said,.. there's a much more important factor to me,.. remembering to charge and check a seperate battery. Never had a BEC related electronics failure in the air when used within specs, but I have taken off without fully charged rx batteries. Yes,.. entirely my fault, but using the single battery and BEC eliminates one possible source of my stupidity casing a crash.
I fly Futaba servos, and measuring even the highest power ones, i've only seen 6 amps peak with the swashplate locked and all of them stalled (i don't recommend doing this, it'll be your responsibility if you "pop" something ). Some of the popular cheap servos I've tried in the past recorded more than that on a single servo,.. so you have to be mindful of equipment selection.

Most important reason I use BEC's is that I've proven I can be too stupid to remember to charge a seperate battery, but if I was using cheapie servos I'd probably use a seperate battery to handle the high currents.

Gary Wright

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12-08-2017 02:33 PM  5 days agoPost 19
gwright

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Champaign Il

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As for the flight time topic,.. i don't see the problem people mention with electrics,.. I'm perfectly happy with 10,5,17 minutes that I see at the low headspeeds I like

Watch at YouTube

Gary Wright

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12-08-2017 03:41 PM  5 days agoPost 20
RM3

rrElite Veteran

Killeen, Texas - USA

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Yeah Im pretty tired after 10 minutes... re-fueling or changing packs allows me to move around and reset my posture as well as how I hold the TX...

where I see people wanting longer flight times is usually with drones/aerial Photo rigs... makes total sense to me there.

BTW blade farts with big LHS electrics... the best.

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

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HelicopterMain Discussion › Longer Flight Time?
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