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Reciever battery endurance - 10/9/2012 10:03 PM   
pitts M 12


 

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From: oakbank, MB, CANADA
Status: offline 		How long should a 900 mah 4.8 volt receiver battery operate on a 7 servo system. The battery in question is the battery included with the 72mhz hitec optic 6 transmitter and the airplane is a telemaster 40. All help is appreciated. Servos are Hitec standred size servos.

JM


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RE: Reciever battery endurance - 10/9/2012 10:20 PM   
TFF


 

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Status: online 		Without a battery checker, I would limit it to about 4 flights although 6 could probably done. Just depends on how you fly.

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RE: Reciever battery endurance - 10/9/2012 10:24 PM   
pitts M 12


 

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Status: offline 		Okay thanks. How about a glider with 4 servos? I'm intending to build a GP spirit glider and want to know how long i can fly for.
JM


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RE: Reciever battery endurance - 10/9/2012 10:32 PM   
TFF


 

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Status: online 		A glider thermalling , a long time. I would keep it under 2 hours without checking with a battery checker; it is probably good for more. Remember that is with a perfect battery; 20% loss in capacity is the normal replacement time. A battery checker is a good investment if you want to push the times to the limit.

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RE: Reciever battery endurance - 10/9/2012 10:57 PM   
j.duncker



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Status: offline 		This is not a question that can be answered simply as a single stiff linkage can more than double the current draw. Also you don't say if your servos are digital or analogue [ digitals draw more ]

I would charge it fully have three flights logging your airtime then recharge it right away using a smart charger that tells you how much was put in. I ALWAYS do this with a new setup.

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RE: Reciever battery endurance - 10/10/2012 2:34 AM   
Charlie P.



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Status: offline 		Depends on the servos (Torque?  Digital? End points bind?), connection friction, surface area of control surfaces, speed at which you fly, etc., etc. 

But as a rule of thumb at least three 10 minute flights unless fewer.  Possibly more.


Get an ESV and check between flights if there is any doubt.  And there is ALWAYS doubt.

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RE: Reciever battery endurance - 10/10/2012 2:47 PM   
raptureboy


 

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Status: offline 		Just long enough to let you think you can fly one more before it dies  I agree, get a loaded digital volt meter and use it every time you fly. You will be surprised how fast a battery that was just charged goes dead. The stock batteries that come with radios are for the most part junk, and I would get a quality battery thats at least  2000mAh for a 7 servo setup. Don't cheap out here, if the plane is worth flying then the battery should be too. Here is a good source for quality batteries and good iinformation. www.hangtimes.com  not cheap but quality never is. Good luck!


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RE: Reciever battery endurance - 10/10/2012 3:15 PM   
pitts M 12


 

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Status: offline 		Whats a good power meter that is not too expensive. Thanks for all the help.

JM


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RE: Reciever battery endurance - 10/10/2012 5:05 PM   
jetmech05


 

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Status: offline 		Wow...It depends on alot of things like has been said ......it even depends on how you fly.....whether you trim your airplane to fly hands off then point it where you want to go and don't touch it until you want to turn...or whether you're all over the sticks and constantly correcting....even weather will effect that.....
I'd say you're good for a couple of flights then you better start checking....Hangar 9 makes a loaded volt meter where you can select the load 1/2 amp for you and don't go below 4.4 volts under load. Or an expanded scale volt meter I am not sure the load it applies while checking voltage but it has a color bar on face to tell you good or not

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RE: Reciever battery endurance - 10/10/2012 7:12 PM   
Rodney



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Status: offline 		A very good substitute (better in my opinion) for a loaded voltmeter is the Voltwatch. Mount it on your plane and then be sure to visually check it at the end of each flight. If the lights are in the safe zone you are good for at least one more flight. The Voltwatch (or one of the less expensive substitutes) will also give you a good indication of any other problems that might pop up such as a switch going bad, a servo that is hanging up or binding or any other problem that causes high current drain. A very inexpensive and valuable aid.

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RE: Reciever battery endurance - 10/11/2012 3:19 PM   
LesUyeda



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Status: offline 		"If the lights are in the safe zone you are good for at least one more flight"

I watch the voltwatch, and run the right stick quickly around a circle to excersize at least two servos simultaneously, to put "some" load on the batteries. If the voltwatch drops any into the red, I do not fly.

Les

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RE: Reciever battery endurance - 10/11/2012 4:08 PM   
raptureboy


 

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Status: offline 		 Here are 2.  I prefer the one from horizon because it has adjustable load for different types of servo loads. http://www3.towerhobbies.com/cgi-bin/wti0001p?&I=LXWW16&P=ML   http://www.horizonhobby.com/products/digital-servo-and-receiver-current-meter-HAN172


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RE: Reciever battery endurance - 10/11/2012 4:34 PM   
JohnBuckner



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quote:

ORIGINAL: pitts M 12

Whats a good power meter that is not too expensive. Thanks for all the help.

JM




http://www3.towerhobbies.com/cgi-bin/wti0001p?&I=LXWDZ5&P=RF#tech

Nine Bucks!

An expanded scale volt meter such as this will work fine for you with four cell rx packs as well as your tx pack, If you go to five cell rx packs you will need the digital type such as above in raptureboys links and they start out at about 20 bucks.

A loaded volt meter such as any listed so far is and should be the cornerstone of any RC modelers flight equipment. This applies to the bench as well as the field.

Now if you want to use on board voltage checks then fine and as has been posted the can detect some other things but a loaded meter is the very first items that new folks will need.

Now I have quite a few of them and in field boxs as well as the bench they are so very useful but any more I never use them much at the field and I have never used a volt watch, These days with my Hitec 2.4 system I always know exactly what my voltages are for the airplane as well as the tx. In the air or on the ground and there is even a 'Lady in the box that tells me exactly what my voltages are unless I shut her off (Sometime sounds kinda like an old girl friend).

So I do recomend (opinion ) the loaded volt meter an important early item to be included with a new flyers field/bench equipment even if he does the voltwatch thing.

John

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RE: Reciever battery endurance - 10/11/2012 11:50 PM   
aspeed


 

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Status: offline 		You should at least check your battery.  If you don't want to get a new charger you can use a 6 or 12 V. light bulb with an Amp marking to give an idea how much life is left after a charge.  A resistor with a known setting is good too.  Having said that, A good charger with the right functions will pay off over the years.

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