I'm planning on the Cermark rep's recommended HS-625mg's for the ailerons and two 645MG's in the tail of their newest 2nd version Cermark 9.5lb Sukhoi 31.

A 69 inch wingspan with aerobat/3D expected performance w/ a G23 in the nose

The slowness of the 645's at just .20/second@6v (torque is 133@6v [email protected]) is bothering me.

Does anyone think it's gonna make a big difference if the 625's (.13sec and 94oz.) are used all around being that their way fa.ster and only 13oz. less torque if ran at 6Volts
or
Am I better off going with the higher torque and less speed?

I presented this choice to MikeMayberry of Hitech and he says:"Typically the 645's are plenty fast enough for 3D flying."

I can't justify the cost of the digital jobbies at this moment so what do you 3D guys think?

root

I have the 645''s on a Funtana and a Showtime. I used those based on recommendations from other guys that were using them.

Your probably not going to notice a whole lot of difference considering we''re talking about 5 hundreths of a second at 6 volts. I seem to remember reading somewhere that "quick" human reaction time is about a quarter of a second at best. I wouldn''t consider 645''s on the slow side either. The *high end* Hitec servos that claim high speed such as the HS-5955 are also only a few hundredths of a second faster that the 645''s. I know a couple of guys that use those on their jets and large scale stuff without any complaints. I guess it just comes down to what you need more, torque or a quicker rotation which you may not even notice. Even with the latency of the 9C running dual elevator servos on the showtime the plane reacts what I would say is instantly. I''ve never said to myself that I wish it would react faster.

I have 645s in my QQ72" Yak and am very happy with them. I usually prefer torque over speed, I figure what''s the use of having fast servos if they don''t have the torque to get you there. If you are not happy with the slower servos you can always buy the 625 gear set and change the gears out, they are interchangeable.

Don''t use any expo. In fact, try it out by using it in reverse. Control response will be VERY quick. Right Jerkey?[sm=lol.gif]