I have another couple questions. In the interest of learning only, I'm not buying anything atm.

1. When picking out a servo like the HS-55 (which I'm getting for my SlowStick), I know that weight and torque are a factor, but how do you really know which servo is best? For example, how would I know if it were possible to use say, an HS-81 with my Slow Stick. Would that even work? (I'm not looking to do that, I'm just asking theoretically). I know the HS-81 is a little heavier and a little bigger, more powerful, but is it TOO big and TOO heavy for the SlowStick? How would I figure that out in general terms for any plane?

2. When choosing a receiver, what is the difference between DUAL conversion and SINGLE conversion? I'm getting the HFS-04MG with my Slow Stick, which is single conversion, but there's also the Hitec Micro 555 which is dual conversion. What's the difference? And how do you know whether you need to choose positive or negative shift? I think I've been told to choose Negative shift for my Hitec Laser 6 transmitter, but why am I doing that?

Thanks in advance guys...

Cheers,
D.