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#1
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Setting up the Cat for oOple race and noticed that when I steer, the motor "stutters"
That is to say that it doesnt cut out but definately drops the revs for a short blip then comes back. This seems to happen only when going slowly (or it might be that I dont notice the small drop when at higher speeds) Any ideas what might be causing this? ![]() |
#2
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the usual culprit tends to be a weak BEC in the ESC combined with a "large" current drain from the servo
the usual supects are savox servos and spektrum RXs ( not exclusively however ) reading similiar posts those two names crop up regularly a power cap pluggesd into a spare RX port can help eliminate this no guarantees on success ![]() i have mainly spektrum rx and some savox servos and have occasionally suffered this ( running 1s lipo, spekky rx and savox servo is a deffo no-no and requires a lipo booster Fid |
#3
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Cheers FID.
I had suspected the BEC too, but hoped against that. You're spot on with the servo - a Savox 1258TG the ESC is a SpeedPassion GT2 (LPF) Never used a power cap before. Are these an RC item available from shops, or is a standard capacitor of suitable rating? |
#4
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Hey,
Something like this is what you are after: http://msdmodels.ie/zencart/index.ph...roducts_id=231 ![]() Receiver plug already fitted. MiCk B. :-)
__________________
http://www.dublinmodelracing.com/ (Off-road racing in Dublin) http://www.p-dubracing.co.uk (Stocking: 8Racing / AVID / GHEA / Xpert Racing / Factory R/C / Alton Design Innovations) http://www.msdmodels.ie/ (Trackside and on-line RC supplies.) |
#5
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Mick - always there with a helping hand!!
![]() Any chance of sending one over to oOple with Derek and the rest of the guys? Will you see them before the race? PM me if possible. Ta muchly! ![]() |
#6
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spektrum do them i think there about £6-7
the current drain by the servo causes the voltage to drop in the BEC supplying the RX ,causing glitches and issues (worst case is the rx switches off (known as a brownout and common in the RC aircraft world and has caused many a lost plane (personal experience ![]() fitting a power cap into the RX usually just boosts the voltage under high drain situations and helps eliminate problems Fid |
#7
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Cheers FID.
Something like the cap thats fitted between the battery and the ESC then? (except its job being to smooth out the power from the lipo cells) |
#8
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![]() Quote:
) http://www.rccarshop.co.uk/index.php...protector.html
__________________
MBModels - Schumacher Racing - Vapextech.co.uk - MRT - Savox - SMD |
#9
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Cheers Mark, really appreciate the kind offer.
Think Mick has got me sorted now, but thanks again. On the wiring side of things - can the power cap plug into ANY free port/channel on the RX? Im using the FrSky system, and their V8R4 is a 4ch receiver with no obvious "batt" plug marked. |
#10
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Every channel on frsky is battery in battery out,have you checked servo travel?If it over stretches you will cause a short thus a cut in the motor.
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#11
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Thanks Derek - great advice - actually you are spot on.
The motor cut was happening BEFORE i setup the end points on the servo. Now that they are set, the motor 'stutter' is almost gone - but still slightly present. The very nice Mick has got me sorted with the power cap for oOple. See you Thurs!! ![]() |
#12
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Good to hear,see ya thur.Your tyres are packed aswell
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#13
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In case anyone else is suffering, these are now available and cheaper then the other options (although just as good). I run them with my Spektrum recevier and Savox servo. I find I don't need them with the low profile servos - only the really torquey ones.
Etronix Power Cap |
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