Its plenty fast enough, only issue i would see is the Jr Plug, the Futaba plug is different... I planned to use this servo on my hk-500 but ended up going with a DS-525m..... Shouldnt be to much trouble to change the plug out, never tried so I couldnt really say, I run all JR Plugs
the only difference between the JR plug and the Futaba is the JR lacks the polarity fin - so JR plugs will always fit Futaba RX's. This servo should work fine with the GY401, but I've had five of these burn out after around 100 flights on the tail of a ZYX equipped 450. The motor seems a bit fragile.
MG-930 isn't very good tail servo to slow, would be a good ccpm servo though. Personally i like the Corona DS329MG for CCPM (it has better torque and a little faster then the 930) and then this HK15158A for the tail.
Yes, it's a good fit in the tail servo mount, though you need to use servo nuts and not use the rubber grommets. It can be set to run at 1520us/333Hz, i.e. D/S mode on the 401b. My main grips with this servo is that it has a bit of backlash in the gears, but it can work pretty well on a 450 tail.
Do yourself a favour though, and get a better gyro! The GA-250 or GY-520 (from another seller)are both mini0mems gyros, and much better than the 401b.
This servo works great for me (sport flying so far). 6 flights back to back on EXI450 Pro. Setting at 1520/70hz on assan GA250 gyro 68%. Comes down cold as a cucumber after 8 minute flights. Power is 2200mah 40c, turnigy helidrive sk3 motor 3600kv, 40a skywalker esc. Weather temp today at 52 degrees F. Am going to put this servo in my HK450v2 soon!!
Most tail servo burning up incidents are caused by binding in the tail linkage, which can quickly creep up on you. Keep that tail lubed! lots of people use them on 450 tails, and they would be a very low cost solution for a 500 tail. Fair bit of slop in the gears though, but then for $7....
I think it would only be safe to set the gyro to 80Hz - which the latest GA-250 will allow, There are so many reports of the servo burning out that I reckon there's a good chance it can't work at more than 80Hz.
little bit of slop in the gear train but i have seen worse. i put this on my hk 500GT tail with gy48v gyro. turnigy dmg930 cyclics, turnigy 1800kv typhoon motor 11t pinion, castle ice75 esc running 5.5v bec, blue lipo 6s 3000, pitch -11/ 11, 80pcnt flat throttle curve. first flight set up/test hover no problems. second third and fourth flight at the field mild 3d loops rolls and flips no problems. tail held well with this tail servo and gyro, i have not hit my max gain yet (tail not wagging) so i am slowly turning up the gain so i am sure it will hold even better in future flights! VERY FAST, HOLDS TAIL WELL!!!
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the servo is working very good for my on the nose wheel of my falcon .25 even after a hard landing that broke the front landing gear fire wall