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HomeRC & PowerAircraftHelicopterRadio - Spektrum DSM › real quick question
09-01-2015 01:39 PM  3 years agoPost 1
allns47

rrKey Veteran

Richmond IN.

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I wanna ditch the 4.8 and go with a 5 cell nimh or some sort of lipo,,,my question is..i am using 2 4.8 volt packs on a r921 receiver,,I wanna get rid of 2 packs and go with a 5 cell or a lipo but my 9254 wont handle anything over 4.8 without shortened life span...do I just need to get a step down regulator to go inbetween the gyro and 9254 or itch it to and get a hv rudder servo

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09-01-2015 01:59 PM  3 years agoPost 2
pctomlin

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Texas

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You can go either way. If you go step down you will have to be careful because it only drops inlet voltage by a set amount. Most step downs are regulated for a six volt system. HV servos can make life easier in this respect.

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09-01-2015 02:01 PM  3 years agoPost 3
chopper37

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NJ and Long Island

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Most of the step downs go 6-5.1v like the align one does, have you considered a voltage reg i use a gyphon with a 2550 mah 2 cell lipo does it all?

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09-01-2015 05:00 PM  3 years agoPost 4
allns47

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Richmond IN.

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i haven't checked out all the options,,

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09-01-2015 07:19 PM  3 years agoPost 5
pH7

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Sterling Heights, MI - USA

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Another choice is a 2S LiFe battery that holds its voltage at just about 6V for the whole life of the charge. The step down then puts the voltage just about right for the rudder servo and you don't need a regulator.

Phil Heavin

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09-01-2015 09:03 PM  3 years agoPost 6
aerocal

rrApprentice

Central California

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The advantages of LiFe are huge.First in my mind is getting rid of becs and regs,the #1 source of power delivery failure in higher current applications.Nothing is without compromise though.The discharge curve is not linear or even much of a curve.They hold voltage until they are at/near the end of the cycle then they fall off very fast.Resting voltage is not a good indication of capacity level.
Telemetry makes monitoring a simple task and you wont get caught dead.
To the OT.If your still running 4s NiMh and havent had huge voltage problems going to a 5s dual pack is also a good option.The stepdown tail regs in my experience are fairly reliable.More than a full system Bec or Reg(I despise them).You dont really have to go full blown HV.A good 6v tail servo will be fine too.
There isnt really a one size fits all solution.There are alot of choices.

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