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T-REX 450 › Tail server replacement 450L dominator. BK vs MKS
06-28-2014 04:53 AM  3 years agoPost 1
knightofcarnage

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chicago

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I usually replace my tail servo on a 450 with Futaba BLS257 but, now these days i think futaba needs do some catching up. So I stuck between 2 servos BK DS-7005HV and MKS HV9780. Anyone use them in 450 size? Thanks

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06-28-2014 05:09 AM  3 years agoPost 2
Funky Trex

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Westerville, OH - USA

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Does BK make the 7005hv with a standard case top? I run a BK 7005hv in a 700 and the case top is oversize for full size servo mounts.

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06-28-2014 05:19 AM  3 years agoPost 3
knightofcarnage

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chicago

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I just knot iced that too. I wonder if it would be ok to use the cyclic version (5001HV) ?

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06-28-2014 05:22 AM  3 years agoPost 4
Funky Trex

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Westerville, OH - USA

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RJX and BK servos are very similar. RJX makes a mid size tail servo with a normal case top and same specs as the BK 7005. This is what I am trying once I kill my current 450 tail servo.

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06-28-2014 05:26 AM  3 years agoPost 5
knightofcarnage

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chicago

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Can you give me a link. Thanks

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06-28-2014 05:34 AM  3 years agoPost 6
Funky Trex

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Westerville, OH - USA

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They currently have 2 mid size tail servos. I am not sure about the differences beyond the servo case.

http://www.helidirect.com/rjx-fs039...ize-p-31818.hdx

http://www.helidirect.com/rjx-hv-mi...15h-p-34113.hdx

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06-28-2014 06:30 AM  3 years agoPost 7
knightofcarnage

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chicago

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The cheaper one is has almost 2 the torque but longer and heavier. The other one is smaller lighter but the torque is about equal to mks. I'm leaning to MKS for 2 reason.
1) Titanium gears
2) No stop pin in the gears. Mks servos spin 360. So in theory much harder to strip any gears.

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06-28-2014 03:05 PM  3 years agoPost 8
bjacks

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Ft. Worth, Tex.

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Tail Servo
They make a case(top haft)that wiil fit that servo so it will fit a 450. Bobby

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07-01-2014 03:10 AM  3 years agoPost 9
knightofcarnage

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chicago

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Well I went with MKS and I'm glad. My buddy just witness a BK tail servo fail in flight.

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