This is the ProModeler DS845BLHV servo. It's one of a series of three servos, this one, the DS845, plus the
DS635 and DS1155 where the basic differences are the motors and gear
ratios - otherwise they're like three peas in a pod!
It's of a size and shape similar to other standard-size servos. It features conventional beam mounts, is designed to be installed with vibration isolating rubber mounts, sports a 25T spline output shaft, and has a brushless motor. It's equipped with steel gears, dual bearings, and is built within an bronze-reinforced all-alloy case. What's more, it meets three MIL-STDS . . . servos just don't get any better.
Basic specifications
- 845oz-in of torque
- 0.06sec/60°
There's nothing else as strong and fast the DS845 (not at any price). How's it match up to a well-regarded competitor like the Savox SB2290SG Monster? Theirs goes about 700oz-in and 0.13sec/60° . . . not as strong or fast.
And with regard to how the build qualities compare? Well, you decide . . .
Gears
Bearings
The DS845 bearing on the left as compared to those in Savox SB-2290SG
is 25% larger, rated ABEC-9, and shielded. Theirs? Sorry, they don't
say.
X-MAXX
With regard to mounting the 2290SG within an X-MAXX, you'll resort to the plastic Traxxas #7749 adapter vs CNC-machined aircraft aluminum solution.
Anti-vibration
Part of what makes the ProModeler DS845BLHV better than competitors is that unlike hobby-grade
servos, it's built to meet military standards (and subjected to these tests).
MIL-STD-810G-Part 16
- Shock - Test Method 516.6
- Vibration - Test Method 514.6
- Rain - Test Method 514.5
ProModeler servos are expressly designed to survive the abuse of the real world outside of modeling . . . and it's another ownership
consideration.