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HelicopterMain Discussion › How many flights should a receiver charge last?
06-02-2004 03:17 PM  13 years agoPost 1
maller

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Bucks County, PA

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I have a Futaba 7CHP for my Evo 30. How many flights should I get out of a charge?

I have a voltage meter, so I am watching it closely. It seems like I'm good for maybe 3 flights. This seems low.

I have a gyro (GY401) and a Co-Pilot, and I'm running S3151 servos.

The battery that I have is the stock one - 9.6 volt Ni-Cd. Should I change it?

Also, can anyone recommend a good quick charger for this battery? And, how do I cycle it down? Other than just letting it run dead. Thanks!



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06-02-2004 03:27 PM  13 years agoPost 2
Wes

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Jonesboro, AR

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transmitter

The transmitter pack would go down just as fast as if you were flying a 2 channel park flyer or a all digital 10 servo helicopter..How low are you letting the battery get?

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06-02-2004 03:53 PM  13 years agoPost 3
raptorheli2

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rip off britain and no changing it

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9.6 volts in your transmitter should last 3-4 hours.

3-5 flights from a normal rx battery of aroung 1400-2000ma is about right before it needs a top up. but with waht you have running i wouldn't even chance more than 4 depending on what battery you have. you need to tell us what ma battery you use to be more specific. it depends on what you are doing. i.e if you are doing 3d it will use more power. also make sure there is no binding. a stalled servo uses a lot more power.

the quick charger is up to you. the choice seems to be either the triton or the supernova. i have the supernova and i like it. this wil discharge your batteries aswell. i charge in between flights so i'm always charged.

letting your batteries just run low by leaving them switched on is not very good for them. nicd need to keep the memory and if you go below this memory the battery can fail.

cheers


www.waterfoothelis.com

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06-02-2004 04:02 PM  13 years agoPost 4
maller

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Bucks County, PA

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Thanks. The manual says to either cycle it down occassionally or let it drain completely (by having the motor off and just keep running the servos until it dies). This isn't good.

The battery that I have is a 9.6v 1000mAh Ni-Cd (NT85600B). Should I get something else? I'm still a beginner, so I'm doing some basic hovering, that's it.



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06-02-2004 04:18 PM  13 years agoPost 5
archangel

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Pasadena, CA - USA

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There is no set number of flights for any given battery size. There are too many factors to consider:
How long are the flights?
How old is the battery?
What kind of flying do you do?

Also, you need to evaluate the condition of your linkages. If they are not totally free and bind just a little, your servos will pull considerably more power from the battery.

I fly with an onboard voltmeter that is a row of lights. I highly recommend these as you can easily see the condition of the battery while it is under load without having to stop your flying. Onboard battery monitoring is the best $30 you can spend on your helis.

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06-02-2004 04:30 PM  13 years agoPost 6
JasonF

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Northern VA

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Four people have replied and we still haven't figured out if this guy is talking about his transmitter battery or his receiver battery.

Maller,
The transmitter battery is usable til it gets down to about 9.4V. It should last for at least 2 hrs on a charge.

The receiver battery that came with your set is probably a 4.8V 1000mAh pack. 3 Flights on this battery is probably about right if you are playing it safe. Suggest upgrading to a 4.8V 1700mah "A" size cell pack for more flight time. Look at getting a Triton charger or Sirius if you want to charge up at the field.

Jason

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06-02-2004 04:31 PM  13 years agoPost 7
maller

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Bucks County, PA

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Thanks.
- Flights average about 15 to 20 minutes
- Battery is about 2 months old
- I'm still just doing some hovering and basic forward flight
- Linkages all look good (no binding).

NOTE - I'm not looking for an exact answer here, just wondering if I have anything to be worried about. I've never had an RC Heli before, so I'm not sure.



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06-02-2004 04:46 PM  13 years agoPost 8
raptorheli2

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rip off britain and no changing it

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ok, what we need to know is

do you want to know how long your transmitter will last or the heli?

if so, what size is your heli batt?

cheers


www.waterfoothelis.com

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06-02-2004 04:48 PM  13 years agoPost 9
maller

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Bucks County, PA

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Jason F - the subject of the original post was "How many flights should a RECEIVER charge last?". That's what I was concerned about. My transmitter seems great.

But, thanks for the other tips. Maybe, I will upgrade to a larger capacity battery. Do the quick chargers damage batteries at all? My manual warned against them.



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06-02-2004 05:12 PM  13 years agoPost 10
IncredibleITGuy

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Portland, Maine

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receiver battery

If you are talking about your RECEIVER battery, it is not 9.8V - that's the transmitter battery - those are anywhere from 600mah on up.

Your receiver battery is either 4 cells or 5 cells (4.8v or 6v)

Mine last for 2-3 flights or so on my Bergen.

3000mah 4.6V running 5 digital servos on my gasser. Then again on a gasser that's probably an hour of flying.

------------IITG------------

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06-02-2004 05:14 PM  13 years agoPost 11
maller

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Bucks County, PA

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Hey, JasonF - is this what I should get?

http://www2.towerhobbies.com/cgi-bi...?&I=LXWX97&P=ML

Thanx!



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06-02-2004 05:15 PM  13 years agoPost 12
FlyinBrian

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USA

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Maller,

"The battery that I have is a 9.6v 1000mAh Ni-Cd (NT85600B)"

That is a transmitter battery and it is 600mah.

The 7chp comes with a 1000mah 4.8v receiver pack.

Go to the link below and look for 4.8v 1700 au receiver packs, they do have 2700 nimh packs in the same size but due to the low voltage output (gyro reset's), extra weight, shorter life, hi self discharge rate I avoid them.

http://radicalrc.secure-mall.com/sh...=19&cart=169930

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06-02-2004 05:20 PM  13 years agoPost 13
maller

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Bucks County, PA

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Super! Thanks everyone.



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06-02-2004 05:30 PM  13 years agoPost 14
sharam

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Northern California - Fly at Morgan Hill Field

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Transmitter Battery: 9.6 Volts

Most transmitter batts from the factory are about 700 mah NiCD. This may be good for about 5 or 6 flights. If you want more flights, buy yourself either a NimH pack 1600 mah or a Lipo pack. You will need more sophisticated chargers than the standard wall charger that comes with the transmitter. If you do switch to these packs, make sure you buy them with the right connector; otherwise, you will have to solder the right connectors on.

Receiver Battery; Generally 4.8 Volts

I don't know the capacity of your rcvr pack but it's probably around 1000 mah. This will give you about 3 to 4 flights on a full charge. I would recommend getting yourself an 1800 mah NiCD rcvr pack. (You can also get a Lipo receiver pack but then you will need a voltage regulator and it becomes more costly and tedious.) Get the 1800 mah NiCD pack. You will probably get 5 to 7 flights on a single charge.

With the higher capacity packs, your std wall charger may not be good enough. For example, a wall charger puts out 50 mah to the transmitter pack. At that rate, it would take 36 hours or more to fully charge your transmitter pack. If you get higher capacity packs, you will also need a battery charger. I recommend the Triton from Great Plains.

I know this is more than your question asked but I figured with more knowledge you can make a more informed decision.

Happy flying.

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06-02-2004 05:40 PM  13 years agoPost 15
maller

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Bucks County, PA

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Actually, that's perfect. I'll probably end up doing that.



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