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Q2 Plans Chapter 11 Page 11-01

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Category: Q-2/Q-200 Plans
Published: Saturday, 20 May 2006 09:05
Written by Quickie Aircraft Corporation
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WHEEL PANT/TIRE/WHEEL/BRAKE ASSEMBLY

INTRODUCTION
..... In this chapter, you will make one left wheel pant and one right wheel pant, complete with wheel, tire, and brake assemblies.
.....The wheel pants are composite structural shapes that must transfer all landing gear loads into the canard. Therefore, they are made much strong_r than the ordinary cosmetic type wheel pants found on many homebuilts. There is some carving required, but you whould find it straight forward.

BASIC ASSEMBLY
..... Begin by making two Wheel Pant cores (LGl) and four Wheel Pant Covers (LG2). The procedures that follow cover assembling the left wheel pant. Since the right wheel pant is a mirror image of the left wheel pant, you will probably find it easy to assemble both wheel pants simultaneously.
.....Join LGI to LG2 with micro-slurry. The template sketch for LGI shows the outline of LG2; basically, LG2 covers up the hole in LGI. You may need to use some weight to hold LG2 to LGI until they are cured.
.....Once the combination has cured, lay it face down on the table with LG2 against the table. Laminate the plies shown in the sketch.


..... Now, you are ready to flag the UNI stiffener over the future location of the LG4 inserts. The stiffener location is shown on the LG2 template drawing. 0 Begin with a piece of UNI cloth 14" x yu with the fiber orientation along the 7" edge. Flag the piece 7 times along the yu edge (i .e. every 2"). Flagging consists of the following procedure:
1. Fold the cloth over on itself.
2. Wet out the cloth.
3. Lightly run a new razor blade across the bubble at the edge.
4. Stipple the cloth down.
5. Repeat steps '1-4 as many times as needed.
(7 times)



..... While the layup is curing, take a second LG2 and layup two BID on the inside face (i.e.) the face that will be inside the LGI cutout when it is attached. Roughly trim the glass so that it doesn't extend beyond the edges of LG2, but don't be concerned if you trim somewhat inside the edges. Flag a UNI stiffener to this LG2 just like you did with the other LG2, remembering that the stiffener is on the side of LG2 that will be inside the LGl cutout when LG2 is joined to LGI.
.....While the second LG2 layup is still tacky, join the second LG2 to LGI with micro. Now, layup two BID tapes on the inside to join the LG2g1ass layup to the LGI glass, as shown. At this point, you should have a sandwich, with one LGI as the core, one LG2 as the outboard face, and one LG2 as the inboard face. Allow the assembly to cure.



..... Next, the two LG4 inserts must be bonded into postition. Remove white foam from the outside of each LG2 down to the inside glass layup in the areas on the LG2 template drawings which denote the LG4 inserts locations. Then use micro to bond in the LG4 inserts.
.....After these layups are cured, drill in the pilot holes for the axle with a long 1/4" drill. To do this, with the wheel pant laying flat on the table, drill through both faces, keeping the drill perpindicular to the pant.

MOUNTING THE WHEEL PANT
..... The completed canard should be jigged upside down. Basically, each wheel pant is jigged in place using lumber for bracing, then the toe-in and camber is checked, which usually necessitates some adjustment to the lumber bracing. When everything is jigged properly, 5-MIN blobs are used to attach the pant to the canard and a piece of lumber is attached between the LG4 insert and the canard so that the assembly will not move. Begin by rigging the wheel pant in the approximate position. The wheel pant slips into placp against the canard shear web and canard bottom skin. Since the canard surface is angling upward as fixed to the jigging table, and since the vertical faces of the wheel pant should
.....be vertical, some beveling of the pant where it fits against the canard is necessary. The bevel is approximately 1 to 10. Note that the LGI core is sized to fit at BL93, so don't modify the inboard edge very much. Once the assembly is trimmed, bracing is used to keep it firmly fixed. Sight thru the axle holes, keeping the two holes in the wheel pant concentric (like sighting thru the sights on a gun). Move the wheel pant until the line of sight approximately intersects the other canard tip where the axle holes on the wheel pant will be located. Bondo the lumber in place.
.....Next, repeat the operation with the other wheel pant except that now you can actually sight on the opposing wheel pant axle holes.


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