SamD,

The wishbone pushrod system for the Javelin works just fine, even with the elevator servo positioned per the instructions. The servo axis can not/does not affect the movement of the elevator halves independently. For any increment the servo end of the pushrod travels backwards (forwards), each of the wishbone ends of the pushrod will travel backwards (forwards) by the same amount, and equally. There may be some flexing of the pushrod because the servo arm is moving laterally as well as front-to-back, but that doesn't cause the elevator halves to see different inputs from the pushrod. There may be lighter systems, stiffer ones, or ones that offer more fine-grained adjustment of the individual elevator halves, but that's a different issue.

I'm also not sure how easily you would be able to shoe-horn a DEPS into the Javelein given that the fuse is pre-built, pre-covered, and extremely narrow. You need to be able to adequately secure the DEPS at a couple of points along its length (inside the fuse). Even if you could do it, I'd still question the worth of putting $30 or $40 worth of CF rod systems or coupling bellcranks on a $130 plane. It is, however, worth replacing the supplied 3- or 4-hole plastic control horns with the bolt-type horn (as well as changing the landing gear). +