9g MG Servo Recommendation needed

[Paul-H]

Hi all

I have finished my Tricopter and awaiting calmer weather for its maiden flight but before I do I have issues with the Tail Servo

Although it works and moves in the correct direction the one I used is quite slow and not so good at returning to centre so obviously will be needing something a bit better before I can fly

At the moment I am using one of the Tower 9g MG Servos so will need something the same size but nice and powerful and quick

Anyone got any recommendations

Thanks

Paul

[guest325]

If you can get it to fit an MG16R is much stronger, I';ve messed about trying different servos for a long time and always come back to that one.  You can get one the same from HK, just as good!!!
http://www.hobbyking.co.uk/hobbyking/store/__6608__D_MG16_Digital_Metal_Gear_2_9kg_0_08sec_18_8g.html

[Revs]

IIRC you';re using APM/Pix..? If so I';d avoid using a digital servo. Because the APM will only allow 50hz refresh rate on the servo channel I found that digi servos ran rough. I use and recommend the Hitec HS65MG.

Most other FCs will allow you to up the refresh rate on the servo channel to 250hz so you can take advantage of a digi servo. In this case I';d recommend the Savox SH-0257MG.

[Paul-H]

Thanks for the replies

Yes I am using a Pixhawk and was wondering if I could use a digital servo as I couldn';t find any setting for it.

Thanks again

Paul

[guest325]

Oh I see, I wasn';t aware of the situation with Pixhawk fc';s - I still use kk2.1x  fc';s for my tricopters, might try a Naze32 with the next one.
In that case you can';t beat Hitec or Futaba analogue servos but I have used a HK 9g (HXT900) in  a small tricopter and found it ok.

[Rammylad]

Hi, I use digital servo';s on my traditional helicopters with APM 2.6 and Pixhawk controllers without any problems,
ArduPilot reccomend using the digital rather than the analogue servos.
Tony

[Revs]

Hi, I use digital servo';s on my traditional helicopters with APM 2.6 and Pixhawk controllers without any problems,
ArduPilot reccomend using the digital rather than the analogue servos.
Tony

It';s different with tricopter as there';s much more moving mass in the yaw assembly than a heli tail. On a heli you';re just altering the pitch of the tail rotor blades whereas on a tri you';re waving the yaw assembly, motor and prop about. Any lumpyness is hugely ampified in the movement. Plus there';s no advantage using a digi if you can';t up the RR.

[Rammylad]

Hi Revs,
Thanks for the explanation I learn something every day. 
Tony

[Revs]

My pleasure

I think the APM recommendation of a digi servo stems from earlier version ofthe FW which allowed for servo RR adjustments. This was dropped before v3.x

[robotdigg]

SG90 Servo?

[hoverfly]

http://www.hobbyking.com/hobbyking/store/__31879__Turnigy_8482_TGY_9025MG_MG_Servo_1_8kg_0_09sec_11g_UK_Warehouse_.html?strSearch=Tgy%2090
Tough little servo,and cheap. ::)