760µs/560Hz (tail rotor gyro only)

Price: $169.99

    Item #: DS135BLHV
    Availability: In stock
    Usually ships In the same business day

    DS135BLHV under construction

    DS135BLHV - 135oz-in - 0.026sec/60°

    (Placeholder DS120BLHV info below)

    Note; we have deprecated the DS120BLHV after a long production run in favor of the significantly faster DS135BLHV. We also offer a mini-size version, the DS95BLHV (95oz-in - 0.03sec/60°), which with an M2S adapter means you may fit the smaller mini-class where a standard-class servo (important if you're counting grams because 95oz-in is enough for a 600).


    The DS120BLHV and DS95BLHV are basically the same servo - but in different size cases. We created the mini to serve the needs of smaller frame helicopters but the reality is, at 95oz-in it's more powerful than many standard size tail rotor servos. Moreover, because even larger 700-class helicopters are perfectly well served with just 50oz-in servos, which the mini nearly doubles, it's pointless to keep making the standard. Especially as the mini is a shade faster and lighter! Bottom line? Both the mini and the standard are overkill, the motor is the same in both and the gearing is slightly different (the mini outputs less torque but makes more speed - one at the expense of the other is how it always works) so going forward, the mini is carrying our flag in the world of tail rotor servos. and you'll find the DS95BLHV is a worthy successor to the larger and heavier version because we've retained all the good points that made the DS120 such a winner, while adding speed, reducing weight, and improving durability (all alloy case). Plus, we did it whilst keeping costs in check . . . win-win!


    Before adding this servo to your cart

    This 120oz-in servo is suitable for helicopter tail rotor applications only! This means neutral is 760µs instead of the 1520µs of servos connected directly to a receiver. Basically, a receiver's servo output sensitivity doesn't extend low enough to signal this servo - it responds only to gyro output.

    This servo represents great value 'and' outputs more torque than our competitors - for when high performance meets a budget - all in a standard-size package! Representing perhaps the perfect tail rotor servo for your Goblin 630, Pantera P6, T-Rex 600, or even 700-class models; these are some highlights;

    1. Features a brushless motor. Electronic commutation means there's no excess heat and 5X longer life because electrons don't wear out.

    2. Plus, we CNC-machined the center case from a solid billet of 6061-T6 aircraft aluminum instead of using cheapo pot metal. And ours, with cooling fins reduce operating temperatures compared to smooth side servos helping better keep things in check when the servo motor is working hard. Fins increase cooling area to better shed electronic-destroying heat!

    3. Then, to reduce weight, we mold the upper and lower case sections with tough Nylon 6,6 and to reinforce it, we press bronze inserts for the gear shaft pockets. This composite construction results in a case that's significantly lighter than an all-aluminum case, which because the tail rotor servo is behind the main shaft helps the CG without sacrificing strength.

    4. finally, the case is assembled with 10 (ten) Allen-head machine screws instead of four (like competing designs) for greater rigidity.

    5. Beyond ordinary dual ABEC-3 ball bearings, this servo has been equipped higher precision dual ABEC-9 bearings for an ultra smooth feel.

    6. You also get all-metal gears (no plastic), and key to higher speed is using lightweight 7075 hard anodize (25T spline) output (the largest gear in the gear train). Added to which, these gears are wider than usual thus increasing the surface area for long wear.

    7. Optimized for high voltage (HV) battery packs (7.4V nominal) or 8.4V from a BEC.

    8. Note; since centering is the sine qua non for a high performance servo, this servo has MIL-SPEC components. Along with a genuine Nobel potentiometer, this means the best possible performance because we don't compromise in our goal of building the best mini-size servo money can buy.

    9. In closing, if you believe protecting the electronics against vibration is important then you'll be happy to learn how instead of a cheapo piece of foam we protect the electronic components of the PCB (printed circuit board) against vibration with potting compound. This is exactly how the military and NASA bullet proof their electronics. And quite honestly, it's a pain in the hind quarters, but we think of it as going the extra mile because like you, we're modelers too. Or put another way, we fly what we sell.

    Bottom line? The DS120BLHV tail rotor servo is probably the one you want because it's better than what competitors offer. It's better because it's brushless, strong, fast, and centers superbly. Note; if weight is a concern, or if you want our very best tail rotor servo, then eyeball our DS95BLHV mini, instead, because it's plenty strong for models up to 800-class but of course, this one costs more. And yes, we acknowledge the irony in our mini-class being considered our top-of-the-range but it is, what it is!