Q1 Plans Chapter 10 Page 10-9

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Category: Quickie Plans

Published: Tuesday, 09 September 2008 01:00

Written by Dan Yager

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The elevators are installed and rig ged prior to the canard being mated to the fuselage. Therefore, after mating, only CS13 needs to be hooked up for a functioning pitch control system.

This section is also quite similar to what you had to do to install the ailerons previously, so review that section before reading any further.

Begin by jigging the canard vertically, with the leading edge at the table.

Take CSM1 and make a 1.31! length piece for the right elevator and a 1.8” length to the left elevator. If necessary, sand these to allow them to snugly fit inside CS16 flush with the inboard end of CS1Ô.

Remove CS17 from the midspan pivot so. that it doesn’t get in the way.

Find phenolic bearings CS15 (2) and CS14. Dull the phenolic with sandpaper.

Find CSA8, CSA6, and CSA7. These three welded assemblies will be used with the elevators to jig the phenolic bearings.

The purpose of the following description is to allow you to fit the elevator in a way so as to prevent binding:

1. Trim the canard core locally so that CS15 can be positioned at BL10.3
2. Find CS19
3. Have one individual hold CS15 against the core while you hold the elevator in position and push CSA7 thru CS15 into CSM1. The inboard elevator should be about 0.5” outboard of CS15 so that the CS8 spacer will fit.
4. Slip CS19 into CSM7 and position CS19 against the rear face of the canard shear web
5. Verify that no binding occurs during elevator movement. If it does, modify CS15 and CS19 till they allow the elevator to rotate freely. Don’t be too concerned with the elevator gap near the midspan hinge since that can be corrected when CS17 is installed permanently. The gap inboard and outboard should be about 0.06” top and Bottom, just like the ailerons.
6. Mix up some 5-Minute in order to join CS15 to the core and CS19 to the shear web. Repeat Step 5 and hold everything in the proper position until the 5- Minute has cured; then remove CSA7 and the elevator.
7. Repeat Steps 1-6 with the left elevator except that CS14 will have to be aligned also.
8. Be careful not to break the 5- Minute bond between any of these pieces. Now lay up the BID that permanently joins the phenolic bearings to the wing core. Be careful not to get any epoxy in the holes.

Once the inboard and outboard layups over the bearings are cured, you will want to permanently install CSI7 between each pair of CS18’s. The elevator gap, which should be min. 0.06” top and bottom, can be set by where CS17 is installed vertically.

Begin by installing the elevators on the inboard and outboard pivots. Remember to leave a gap of about 0.5” inboard for CS8 spacers later on. Next install CS17 on CSM3 against the face of CSM2. Make it the core of a sandwich with a pair of CS18’s, and trial fit the sandwich in the canard against the shear web (the cutout for the sandwich should have been done earlier). When satisfied with the fit, permanently mount the CS18’s and CS17 with flox. Use tape and stirring sticks to maintain the elevator gap top and bottom at about 0.06”. Permit the combination to cure one day, then lay up one BID across the sandwich top and bottom to smoothly join them to the canard core. Some sanding of CS18 may be necessary to make a smooth transition. Repeat this procedure with the other elevator.

The CS8 spacers prevent the elevators from sliding off the pivots inboard. The installation is the same as what you did for the ailerons. Allow about 1/32” to 1/16” free play in the system. Remember that the elevator must not fall off CSM5 and CSM3 until it has moved inboard at least 0.3” inboard.