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HomeAircraftHelicopterFlybarless Rotor Head SystemsFutaba CGY › BLS-157 servos seem pretty warm after flight
10-13-2012 03:41 AM  5 years agoPost 1
Adam Landefeld

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Lehi, UT, USA

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Just got my new e720 FBL flying and it flies spectacularly. I noticed that my servos are quite warm (almost hot, probably 120-130F) to the touch after a flight. Can anyone tell me what temperature range they should be at?

I'm running:
CGY750 on "3" feel, fastest servo com speed, 75 gain on ail and ele.
BLS-157 on cyclic
BLS-256 on tail
CC Ice2 HV 120
Kontronik Pyro 700-45L
Gens Ace 5300mah 12S for power system
3300mah 7.4v 2S battery for radio equipment

I don't have anything worrisome except the temp, I suspect it could be normal but want some confirmation.

Anyone have some experience to share?

Thanks,
-Adam

Futaba Factory Team
Team FlightPower
Thunder Tiger

https://www.facebook.com/UtahHeli

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10-13-2012 06:45 PM  5 years agoPost 2
jadams

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East coast USA

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They will be warm and even warmer at 8v. Just make sure they are set to 285hz. You can lower the temp a little by lowering the head response numbers for the ail and elv. (if it's at 1 try 2 or 3)

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10-14-2012 09:29 PM  5 years agoPost 3
kcordell

rrElite Veteran

O Fallon, MO

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You realize that the 157HV's are airplane servos and have different deadband area than the heli HV servos?

Team Futaba, Team Synergy/Rail, Team Scorpion, Team Castle Creations, YS Engines, VelTye

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10-14-2012 10:05 PM  5 years agoPost 4
kym

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Provo Utah

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So does that actually matter?

On the futaba page has no direction whether it's a plane or Heli servo

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10-14-2012 10:26 PM  5 years agoPost 5
kym

rrApprentice

Provo Utah

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My personal opinion I think Brushless servo are going to run a little hotter because they are brushless and it does not help that are 500 Ounces of Torque I wouldn't worry about it

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10-14-2012 10:31 PM  5 years agoPost 6
Adam Landefeld

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Lehi, UT, USA

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Yes, completely aware. Not an issue (for me) especially since the DB on the 157 is tighter than most high performance brushed digitals (heli or plane). The response on these is incredible and I like how it responds better than my other 90 setups (JR 8917HVs and Hitec 7940THs). 255s are great for sure, but I wanted a lot more torque so the speed would remain a constant no matter what load the head could apply. I would normally respect the "1" vs. "2" futaba designation here but chose to try something. Now, unless the DB is causing the servos to warm up due to oscillation from the fbl unit, I'm still extremely confident in using these servos as cyclic servos.

Futaba Factory Team
Team FlightPower
Thunder Tiger

https://www.facebook.com/UtahHeli

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11-04-2012 02:01 AM  5 years agoPost 7
Adam Landefeld

rrApprentice

Lehi, UT, USA

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Just an update for those who might have wanted the answer to this temperature riddle.

Turns out it was remedied simply by changing the response rate for the servo control loop to setting 2 instead of 1 on the CGY750. Power consumption also went way way down.

They are working awesome!

-Adam

Futaba Factory Team
Team FlightPower
Thunder Tiger

https://www.facebook.com/UtahHeli

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