Update - I have now fitted Futaba BLS173SV servos and Futaba aluminium servo arms to the Allure. These servos should improve elevator tracking and the servo arms are more rigid than the plastic Futaba arms used previously.

Special Note: When using the CK Aero control horns, the front edge of the horn should be mounted on the edge of the elevator as shown in the gallery picture below.  These horns have been designed in a control linkage program and they are to be fitted in this manner. This results equal travel in both directions. When mounted this way, the pivot point will be slightly ahead of the hinge line. I have used the 17mm CK Aero control horns on the elevators.

The supplied stab servo trays are a little small for my Futaba BLS153 servos. This being the case, I made some new ones out of lite ply. Future models will have this tray fitted and the cut-out will already be done for you. The actual tray will also be a little larger. I've made the trays a little bigger all round to allow more gluing surface area.

 

The stab servo trays were glued into place using 30 minute epoxy resin with the excess resin being wiped away using cotton buds and methelated spirits. A Futaba BLS153 servo was then fitted to each stab half. Masking tape has been used to work out where everything should be positioned. Simply mark out the component locations with a fine point permanent marker or Sharpie. Don't you just love masking tape... The person that invented this tape must have made millions! lol

The 17mm CK Aero control horns are fitted to each elevator with No.2 x 1/2" stainless steel self tapping screws. We supply these screws in both 1/2" and 1/4" lengths when you buy the horns from Precision Aero Products. You will need to locate the elevator hard points and then mark out the positioning of the horns. Then it's just a matter of making some 1/16" pilot holes for each of the three screws.

Ralph Schweizer M2.5 titanium linkages will be used on this model. These can be ordered direct from Ralph. They are of the highest quality. Fitted to each end of the RS linkages are NMP 2.5mm Dual Axis Rod Ends. These rod ends eliminate slop!

A standard four(4) point Futaba servo horn was used on the elevator servos which is more than adequate for the required 15 degree maximum throw for spins.

You will need to cut two holes in the fuse sides to allow the servo extensions to pass through. On my model a small mistake was made here. If you look at the pictures in the gallery, you'll see that a ply former is placed just aft of the front stab adjuster rod. I managed to position the extension hole right in the middle of this former. I would suggest making your hole centre 5 or 6mm lower than the stab centreline to avoid this former. In the end, I only cut into the back part of the former so all is good. The extension exit hole centre is 18mm aft of the stab adjuster rod centre.

You may find that the elevator seems a little stiff in the hinge. This is the nature of these hinges and a little heat from a hot air gun or your wife's hairdryer will free them up. Be careful not to overheat them of get the hot air gun too close to the surface. It doesn't need much so use a low heat setting and hold the gun 4 to 6" from the surface.

This is important! The right hand stab half has the carbon tube glued into it permanently. DON'T try to remove it. The tube has been glued in deliberately to reduce slop in the stab fitment. 

The front stab adjuster pin is carbon fibre and a little over length. Feel free to cut it to an appropriate length which allows enough protrusion from the fuse to pass through the stab adjuster. You should also bevel the ends to allow easier alignment and fitment through the stab adjusters later. The carbon pin can then be glued into the fuse permanently. I used 30 minute epoxy for this task. The left hand stab is retained by a single wood screw that passes through the lower stab skin into the stab tube. All the stab tube hard points are preinstalled and drilled.

That's it, the stabs are done.

At this point I removed the stabs and put them aside in their protective covers.

  • Both-Stab-Trays-Done-Bigger
  • Both-Stab-Trays-Done
  • Elevator-Linkage-Complete
  • Elevator-Servo-Cutout
  • Elevator-Servo-Extension-Hole
  • Elevator-Servo-Extension-Hole2
  • Elevator-Servo-Extension-Hole3
  • Elevator-Servo-Extension-Hole4
  • New-Servo-Tray
  • Original-Servo-Tray
  • Stab-Servo-Installed-Closer
  • Stab-Servo-Installed
  • Stab-Servo-Tray-Glued