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[Brian60]

Is this really the smallest servo available? I need something half this size ideally, anyone got a clue please?

[Allnightin]

If I understand correctly, the SG90 weighs 9 grams

You would do much better if you look at component shop offerings:

https://www.componentshop.co.uk/servos.html

[Brian60]

I've actually managed to locate one on the Hobbyking website, a nano size weighing just 2 grams, physical size along with weight were my considerations, but as they were only £2 each I ordered a couple of varying dimensions, I've a feeling the smallest will not have enough torque to move even the rudder which is only a 10mm by 10mm blade, but we will see.

[Subculture]

More than enough torque for a small rudder that size.

[roycv]

Hi all, there is a point to watch with these small sevos.  The first time I fitted one I involuntarily moved the rudder and it stripped the plastic gear in the servo.  So be careful.

regards
 Roy

[Subculture]

If you’re concerned about that, putting a small hoop/ u-bend in the linkage can act as a basic servo saver.

[roycv]

Take your point sub....  I have since bought metal geared servos this size.  I have a Billings Mary Ann which now has a 9 grm servo for the rudder, but there is not much room to allow for a relief system for the servo.   Bear in mind that the torque numbers was less than 1 kgrm.  I note Howes ones are twice this figure, which would suggest that the gears are more substantial.
regards

Roy
 

[Subculture]

You won't generally find metal geared servos below the 4-5 gram size, the whole point is weight saving more than size, and whacking lumps of metal in somewhat defeats the object of the exercise.

There are also the micro (1.5g) jackscrew type servos, which are inherently self-locking, although nothing is indestructible.