I want to build my "Mk I" with the the new "Mk II" spoilers. They use two micro servos (one at each spoiler) for easier construction, setup and maintenance." Could you e-mail me a sketch of this?

From : Don Stackhouse

How about a photo? The one I've attached is taken through the transparent covering on the underside of the wing of my prototype.

The little horn on the left of the photo is left over from the original spoiler linkage that was operated with music wire cables in nylon tubes, from a single servo in the wing center section. I didn't bother to remove it when I converted this wing to the new system, but the old horn is obviously not connected to anything.

The little pushrod is made from a piece of soft .032" steel wire. In the kit we supply some AISI 302 stainless steel aircraft safety wire, but you can use .032" wire from a paper clip, like I did on the prototype. The kink in the middle of the pushrod is for adjustment; just bend it some more or straighten it out as required to make the spoiler lay flush with the upper surface of the wing when closed. One or two folks thought they could "improve" the design by using music wire for this pushrod. They soon discovered that music wire was far more difficult to bend precisely, was much stronger than necessary, and was virtually impossible to adjust. Use the soft wire for this little pushrod, it has more than enough strength for the job.

In order for the two spoilers to both move in the same direction when their servos are hooked up through a common "Y" connector, their output shafts have to both be pointed the same way, towards the left in the case of my prototype. Therefore, the output shaft of the left spoiler servo points towards the left wing tip, with the base of the servo against rib "F", while the output shaft of the right spoiler servo points towards the wing center section, with the base of the servo against rib "G".

Don Stackhouse
DJ Aerotech