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HelicopterMain Discussion › How Do I estimate Flight Times for a Receiver Pack
08-03-2013 08:20 PM  4 years agoPost 1
HeliNutAndy

rrKey Veteran

worcester, MA USA

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I am using a 7.4 volt 2550 Mah Lipo straight into my Vbar without any regulators to power my electronics. I was told that I would only get 3-4 flights out of the pack. This morning I used two packs which I got 4 flights out of each pack or eight total. When charging the packs I noticed that I am only putting ~275 mah back into the packs. How many flights can I get out of these packs before I need to recharge? I am using 6V servos and sport flying with a few 3d moves thrown in here and there

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08-03-2013 08:29 PM  4 years agoPost 2
unclejane

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santa fe, NM, USA

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Unfortunately, you just have to measure it. Eg. go fly X times and recharge. Note how much you put back into the pack and calculate it from there.

4 flights at a cost of only 275mah is holy smokes outstanding lol. That's usually about what I do with 1 flight....

LS

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08-03-2013 08:42 PM  4 years agoPost 3
HeliNutAndy

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worcester, MA USA

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This is my first experience with measuring what I am replacing and I thought that the amount I was using is small. According to me only replacing 275 mah shouldn't I be able to get at a minimum at least 10 flight out of each pack?

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08-03-2013 08:49 PM  4 years agoPost 4
Heli 770

rrProfessor

USA.

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7 flights if you're using the 80% rule and putting back in 2040mah when charging.

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08-03-2013 09:18 PM  4 years agoPost 5
wrongler

rrProfessor

Brewerton, New York

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Just to be on the safe side I would do 5 flights and measure how much you put back!

Bill Whittaker

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08-03-2013 11:23 PM  4 years agoPost 6
Heli Fanatix

rrVeteran

Fountain Valley, CA

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What kind of esc are you running? Most will support a buffer pack. Buffer packs are like rx flight pack. I've used a kontronik jazz 80 and after reading the manual closely I realized BEC only puts out a poultry 1.5 amp. Although my setup was mild:
Logo 500 with 553mm mains & 85mm stock tails
Futaba S9252 x 3 / S9254 on tail
HS 2050

5 minutes of loops, rolls, piroflips & tic tons (sloppy collectives since I was learning)

I was flying like this for about 20 flights fine. Kontronik is probably under rated & futaba servos are not power hungry and very easy on the BEC.

So I decided to add a AA x 4 2200mah nimh size flight pack w/o red wire from esc. Each 7 minute endeavor pulled just like your result...about 271 mah, so I can get about 4 flight safely, 6 if you push it with about 500mah of 2200mah left. Than I did some research and found out if I connect the esc's red wire....it would charge flight pack and give me reduncey on my electronic power setup. After eight - 7 minute flight cycles with red wire connected would pull only 280mah. Keep in mind this is a AA 2200man pack with a 1.5 amp rated BEC....so with a 800mah Nima pack, you don't have to charge it. As long as its fully charged at the beginning of each flight session....it's like a buffet....all u can! Just keep in mind you have to cycle the buffer pack every month.

Currently I'm using the Align DS610 power hungry servos in conjunction Kontronik 80HV with custom made master and slave harnesses and no buffer packs. As long as you keep voltage @ 5.5v, it's bomb proof.....no buffer packs required but highly recommended on 700 sizes!
Running 5.5v and 6.0v isn't noticeable ..... Now HV setup is another animal.

This is 2 weeks of BEC experimenting in a nut shell. Hope this helps!

- Scott

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08-03-2013 11:59 PM  4 years agoPost 7
Luvmyhelis

rrApprentice

Spokane, Washington. USA

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I run MKS HV servos throughout and noticed about the same charging results as you did on my Pulse 2550 packs. I work mine pretty hard too. I was actually surprised when I charged it back up just like you. I regularly fly each heli about 5 to 6 times per outing on the packs now and rarely put as much back in as I expected. Seems like the low voltage systems I ran earlier pulled far more out of the packs running them through a bec such as the ProBec or Hercules. Those losses were much higher?

Old cranky heli builder

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08-04-2013 12:50 AM  4 years agoPost 8
Heli Fanatix

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Fountain Valley, CA

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Yes ....takes power to regulate power. Straight 800mah pack to your esc would do the trick (assumming you are flying eclectic)

-Scott

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08-04-2013 01:03 AM  4 years agoPost 9
cudaboy_71

rrElite Veteran

sacramento, ca, u.s.

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i use this little guy on my helis with a 2s rx pack

http://www.western-robotics.com/sentinel_lipo_hp.html

i usually pull the pack and charge it when the first 2 green lights go out.

if it ain't broke, break it.

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08-04-2013 01:19 AM  4 years agoPost 10
Heli Fanatix

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Fountain Valley, CA

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I went through the whole spectrum on the power system..... Nima, lipo, life, A123 in combination with stand alone BEC or regulator and the reliability & reduncy factor is important. I know western robotic failing too. It's not the circuit but metal fatigue. Wires separating from circuit boards from overtime usage. And helicopter have tons of vibs. So if your BEC fails with no back up... Is dirt nap time!

Lipo or life packs can not be charge by esc's BEC and you'll have to bring a couple of rx packs if you fly a lot and don't have a generator.

Plus the cost of a western BEC and lipo or life packs is a lot along with the setup and weight. Add a 800nimh pack for about $10 and you are set. As simple as it gets ...unless you like it complicated.

- Scott

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08-04-2013 01:28 AM  4 years agoPost 11
Zaneman007

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Texas - USA

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I find that different servos draw different maH per flight. I divide the number flights by the ma put back into the pack.

I also use an EOS Sentry battery tester. It gives you the voltage and percent remaining. It works well.

Another rule is to never fly when you go below 7 volts with a 1.5 amp load.

From my experience futaba servos draw the least, Savox HV servos draw the most, and JR servos are somewhere in between.

Old Guys Rule!

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08-04-2013 01:35 AM  4 years agoPost 12
cudaboy_71

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sacramento, ca, u.s.

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i like it simple.

no light up. no fly.

if it ain't broke, break it.

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08-04-2013 02:40 PM  4 years agoPost 13
HeliNutAndy

rrKey Veteran

worcester, MA USA

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What kind of esc are you running?
I'm using a Pheonix Edge HV esc. The heli came with a Kontronik which I still have but it is acting funny when I test it on the bench and I do not trust using it at the moment. I have another thread out there regarding that problem.

My setup is:

Mini Vbar
3 Align DS 610(6 volt) servos
1 Align DS 615(6 volt) servo

RX pack 2550mAh 7.4V

Last night I used the rx pack 5 times and when I charged it this morning I only needed to put 400Mah back into the pack. At this rate I should be able to get at least 20 flights from a single pack using the %80 rule. I think I am going to stick to 10 flights or under just to be safe.

It is a beautiful day out and I am in love with my new model. I wish everyone a safe and happy day of flying

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08-04-2013 03:15 PM  4 years agoPost 14
unclejane

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santa fe, NM, USA

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How long are your flights, by the way? On my electrics I get about 10 mins flight time, but use probably around 300ma per flight (my flight system is similar, DS610s/650 on a 700E). How you can get 5 flights with 400ma, I want to know your secret lol!

LS

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08-04-2013 05:43 PM  4 years agoPost 15
HeliNutAndy

rrKey Veteran

worcester, MA USA

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I guess my secret is that I must stink at flying because you guys seem to be using more juice than me

I just got back and flew 8 times on a single RX pack and I have to admit my knees were shaking. I am going to see how much I used this time. I feel like Kramer trying to see how far I can go when the gas gauge is on empty. I get 7-8 minutes flight time out of 4000 mah 10S pack on a Logo 600. It's a new model with about 20 - 30 flights on it so I have been taking it easy.

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08-04-2013 05:59 PM  4 years agoPost 16
Zaneman007

rrElite Veteran

Texas - USA

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80 maH per flight seems a bit to low, to be real. The best I ever got was 250 maH per flight.

Do you have a battery tester? If not I'd highly recommend getting one. I always test my battery between flights. I've seen guys crash hard because they "thought" the battery was charged.

Old Guys Rule!

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08-05-2013 01:53 PM  4 years agoPost 17
FireNWater

rrApprentice

Collierville, TN

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.
2S receiver LiPo's are cheap. My technique is to have two and just rotate them every 2-3 flights. One is in the helo, and the other on the charger. That way I always have a freshly charged battery - and peace of mind.
.
Here is an Eagle Tree reading of in flight radio amp draw measured between the BEC and receiver. Helo is Trex-600 with DS-610 servos. The spike at the end of the graph is me pushing down on the swash and pulling the tail rotor servo as hard as I can on the bench trying to max out the servos.
.

Buy Cheap, Buy Twice . . .

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08-05-2013 02:13 PM  4 years agoPost 18
unclejane

rrElite Veteran

santa fe, NM, USA

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Ah it's a 600 size. That may explain it, probably not quite the same flight loads as a 700.

I use a 3800mah thunderpower 2S flight pack as my RX packs on my 3 700's.

The Whiplash nitro has thrown off my calculations on flight time at this point due to the long flight times (about 17 minutes on a full tank). But on Sat. I did 4 or 5 flights of about 15 minutes each - basic sport flying, hovering practice both NOBAR and with the gyros on, and Sunday I put 1400mah into the pack.

So that's still way less economy than yours. Next weekend I plan to do some actual controlled measurements, tho.

But it's the same concept basically. I can do about 4 full tanks and that gets me approx. to half capacity on a 3800mah pack...

LS

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08-05-2013 06:34 PM  4 years agoPost 19
FireNWater

rrApprentice

Collierville, TN

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Ah it's a 600 size. That may explain it, probably not quite the same flight loads as a 700.
.
Well, my 700 uses the same size and number of servos as the 600 so I don't see how the amp draw will be much different. I can't press any harder on the swashplate and T/R servo of the 700 as I can the 600.
.
So. . . I'll have some good graphs from the 700 in a week or two . .
.

Buy Cheap, Buy Twice . . .

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08-05-2013 07:02 PM  4 years agoPost 20
Ace Dude

rrProfessor

USA

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I have a 2100mAh LiFe pack on my 50 size heli. After three flights (8 minutes each) the pack usually takes 900-1000mAh to recharge. I could get another flight, but I always play it safe when it comes to RX flight packs and recharge after three flights.

  

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HelicopterMain Discussion › How Do I estimate Flight Times for a Receiver Pack
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