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HomeAircraftHelicopterRadio - Spektrum DSM › 7100r input voltage
01-12-2011 02:37 PM  7 years agoPost 1
ssrobzoom

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Tn

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I was reading the the volt range on a 7100r is 6v-10v is this input voltage.

I know of a flyer running his 7100r on 4.8v nicad input voltage. Will this damage or affect its performance?

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01-12-2011 03:48 PM  7 years agoPost 2
PC12DRVR

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USA

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Not a good idea to run 2.4ghz Rx on 4.8V they recommend a 6V high ouput power supply especially if you are running multiple high current servos. Thats a minimum. Check the manual or go online at Horizon and download one.

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01-12-2011 04:10 PM  7 years agoPost 3
ssrobzoom

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Tn

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The servos his running are Futaba BL 451's and 251 on tail

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01-12-2011 04:19 PM  7 years agoPost 4
TrevJonez

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St.George, Utah - USA

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it says right in the manual DO NOT USE A 4.8.

the regulator won't work properly.

i run mine off of a LiFe 2s for 6.6v working great but i don't know what those futaba servo's will put up with.

Who cares... its just money...

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01-12-2011 04:21 PM  7 years agoPost 5
wtvariety

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Charleston wv

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4.8v=oh crap

dont do it!

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01-12-2011 06:47 PM  7 years agoPost 6
ruddernate

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sulphur,Ok.

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4.8v=oh crap
Sooo true. When I got into the hobby I used very simple setups with 4.8 volt setups and I started with 2.4 without issue. When I started adding more digital servos, better gyros, etc. I had a few helis fall out of the sky for "no reason". Battery showed to be charged but spikes downward in voltage was causing my rx to reset. I'll never use 4.8 v. on anything again. Well maybe a small plank.

fly it like you stole it

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01-13-2011 01:58 AM  7 years agoPost 7
ssrobzoom

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Tn

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Here is the specs on the Futaba BL451's:

BLS451 Brushless Digital High-Torque High-Speed Servo
FUTM0552
Volts Torque Speed
4.8V 118 oz-in. 0.13 sec/60°
6.0V 147 oz-in. 0.10 sec/60°
Dimensions Weight
1.6 x 0.8 x 1.5 in. 2.1 oz.

So if I use a 5 cell Nicad which will be 6.0volt, it should work without issues and supply the 6.0 volts only to the Cyclic Servo?

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01-13-2011 03:35 AM  7 years agoPost 8
TrevJonez

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St.George, Utah - USA

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Looks good to me. Just make sure the battery can handle the load.

Who cares... its just money...

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01-13-2011 06:02 AM  7 years agoPost 9
AaronJohnson

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mason,MI

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Stay away from "nickel" chemistry batteries with digital servos, problem is under load they don't hold the voltage like a lithium battery will. Look into LiFe which is a lithium phosphate battery that is 6.6v so no extra regulator is needed. OR a LiIon/Lipo with a regulator, you can also run the LiIon/lipo straight to your cyclic servos with the 7100R however I do not know if the bls servos will handle straight 2S voltage.

You got the high end servos you NEED the "high end" battery. Good lithium receiver packs can be had for less then $20. Nickel batteries have no place with high end digital servos, you would be asking for problems

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01-13-2011 11:36 AM  7 years agoPost 10
v58 fuy

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UK - Kent

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I agree with all the comments above, receiver packs are one of the cheapest items on our helis - but use a poor one and you will pay for it many times over.

Unfortunately this is a typical situation which has much wider consequences. Because when the battery gets loaded and the voltage drops below the rx limit, a crash will happen through loss of signal - this will nearly always end up with the manufacturer of the radio system being blamed for making a 'crap' radio, and all the members of that club will think twice before being the same brand.

When actually the manufacturer clearly told the user not to do soemthing, which they chose to ignore - and in truth it is not a crap radio, but a crap operator.

Sorry for being harsh, but it's true.

David

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01-13-2011 11:40 AM  7 years agoPost 11
helismash

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Gloversville, NY - Fulton

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4.8V on a 2.4GHz Spektrum is a no no. If you look in the manual for the 7100 it tells you not to fly on 4.8 volts.

Hey, Who put the ground there!
T-Rex 500/T-Rex 600N FBL/T-Rex 600E PRO/T-Rex 700N/T-Rex 700FBL

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01-13-2011 09:20 PM  7 years agoPost 12
Thatlumox

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NY

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I would agree that 6.6 LiFe batteries are a good way to go. I run 3 Futaba BLS451's plus a 611 gyro with a AR7100R off a LiFe in my Trex 600N.

"I'm a dirt torpedo!"

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