This is the ProModeler control arm/servo package for replacing the stock arm/servo in your X-MAXX when using the Traxxas #7749 servo adapter that replaces the stock unit with a 930oz-in brushless high voltage all-alloy steel gear train high performance servo.
The arm is part of a servo-package. Both it and the servo are CNC-machined from a solid billet of 6061-T6 aircraft aluminum. The arm is anodized red (there are loads of YouTube videos showing the oven cleaner method of removing the color of anodized aluminum). The servo is one of our most powerful brushless servos, which is modified to fit an X-MAXX - ProModeler brushless DS930BLHV servo - click the link for details (this opens in a new tab). However, to save time; these are the highlights . . . 930oz-in, billet aluminum case, brushless motor, steel gears, steel hard points, 13 o-rings, plus it meets:
- Shock - Test Method 516.6
- Vibration - Test Method 514.6
- Rain - Test Method 514.5
If you find a better servo, buy it. Tell us so we can improve ours.
Pro Tip: in common with any servo in this class (+900oz-in), the DS930BLHV needs as much as 6.7A of current (not while loafing, but when it's working hard). At 7.4V this works out to a bit more than 45W (the case isn't finned for decoration, it gets hot) and at 8.4V this goes over 50W. The point is, either use a BEC with enough cojones to do the job, or opt for a separate 2S LiPo (like a nitro rig) because even an ordinary 30C 2S1000mAH LiPo will output 30A).
This begs the question; which is better, a BEC or a 2S LiPo? Honestly, it comes down to a bit of grade school math, and whether you value convenience over performance. We prefer batteries because their output isn't garbage and noise - but - everybody makes their own decisions. Honestly, we don't care because the servo will run on either source. Further info to help you decide which is best for you.
As for a BEC, we offer a 20A unit from Castle Creations CC BEC Pro 20.
Final note; your DS930BLHV servo is supplied with the 'beam mod' where part of the beam closest to the output shaft is removed. This is so it fits within the Traxxas adapter.
Last thing; if you'd rather not have a servo with the beam mod, just mention it in the notes when you order - but also note; this service is built into the package pricing (meaning they're on the shelf and while we don't mind swapping out the servo for one that's unmodified before shipping, we're not also going to take time to go into the computer and adjust the price of the order). Don't like it? We're sorry, it's the way it is.
Pro Tip: Control horns will strip out when they come loose of the splined output shaft. Not much we can do about that because it's on you to ensure the nuts and bolts on your model stay tight. Thus, you'll be wise to either use a chemical means to help secure it (thread locker - blue, not red), or a mechanical aid, like with a star washer, or lock washer, etc. This, in addition to performing routine preventive maintenance on your rig, like checking the security of the important fasteners. Also it's worth trying to see how long a bolt will actually thread into your servo (they're all a little different) and if you can use one that's a little longer than the one we supply, then use a longer one to get more thread engagement.
The following photo sequence compares and contrasts two servos that are popular in the XMAXX, the SAVOX SB-2290SG and ProModeler DS630BLHV.
- SAVOX SB-2290SG vs ProModeler DS630BLHV -
Last thing; if you'd still rather have the SAVOX SB-2290SG, kindly do us the favor of sharing your thought process with John at 407-302-3361 please because we are eager to learn more about the X-MAXX market.