Q2 Plans Chapter 10 Page 10-06
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- Category: Q-2/Q-200 Plans
- Published: Sunday, 21 May 2006 10:05
- Written by Quickie Aircraft Corporation
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INSTALLING THE ELEVATOR SLOT FOAM CORES
..... This step is critical to having a nice looking canard and elevator union, so follow the directions carefully. .....To start out with, the elevator slot foam cores that you hot-wired way back when were pur posely made longer than neces?ary. Your first task is to size them for the correct length. To do this, you must measure your fuselage width at the fuselage/elevator slot foam core junction. Take measurements of the canard, skip ahead to the sec tion on "Mounting The Canard To The Fuselage", and determine that dimension, on either side of BL00. Mark the proper points on the canard. Wait to trim the inboard elevator slot foam cores until after they have been installed on the canard. .....Next, determine where to trim the outboard elevator slot foam cores. Since each elevator was made 72" long, measure 6 feet plus 1 inch (for elevator/fuselage clearance) from your first mark outboard and place another mark. This is where the outboard elevator slot foam core will be trimmed, but, as before, wait until after installation to do it. .....The elevator slot foam cores are unique in that both the brake line conduit and the pitot tube must run through the lower, forward edge as shown on the sketch. .....The pitot tube runs out the right canard, exits at about BL40, and is shaped as shown. .....In the right canard, the brake line conduit enters the inboard end of the elevator slot foam core within 1/2" of the top edge, and continues all the way outboard to the end of the outboard elevator slot foam core on the right side of the aircraft. Let the Nylaflow tubing extend about 4" beyond the end of the slot foam core. On the left canard, do the same routing. You should use a router bit in the dremel to route out the foam. Any extra "room" in the foam is filled with dry micro. Both the brake line conduit and pitot tube are installed with 5-MIN dabs to hold them in place, and then surrounded with dry micro, as shown. Keep both lines, but particularly the brake line conduit, as straight as practical. The pitot tube tubing should extend into the fuselage about 12". .....The elevator slot foam cores are installed to the canard shear web with micro-slurry on the foam cores and epoxy on the shear web (don't forget to remove the Peel Ply!), plus a few dabs of 5-MIN to keep the two _ttached during cure. .....It is easier to check clearances top and bottom if the canard is jigged vertically on the jig table. This will also keep the joint from running. By this time, you should be so good at jigging, that we won't even talk about how to do it. .....The important point to remember is that at the shear web attach point along the span, the top and bottom of the elevator slot foam cores should flow smoothly into the top and bottom surfaces of the canard, respectively. If the elevator slot foam cores want to stick up a little bit, this is OK since that can be sanded later. Any dip, however, will have to be filled with micro. When you have done your best to carefully fit the shear web joint top and bottom then mix up the micro-slurry and epoxy and join the elevator slot foam cores to the canard. .....Once the attachment has cured, then the fun can begin. Trim the elevator slot foam cores back to the "Eventual Trim Line". Next, sand down the "tails" so that you can achieve a minimum of 0.4" of glass-to-glass bond with the inside lamination, while at the same time fairing everything nicely into the canard contour forward of the shear web. At the glass-to-glass bond area, you must sand away all micro and epoxy and get down to the glass. Spend some time looking at the surfaces getting the best alignment that you can. When everything is ready, laminate 2 BID at 45 degrees to the canard shear web on the elevator slot foam cores, being sure to achieve at least 0.4" of glass-to glass bond, and lapping up onto the canard at 1 east 1". Note that the sketch ca 11 s out dry-mi cro fill if required at the top and bottom of the shear web joint. Trim the inboard and outboard elevator slot foam cores at the marks previously made on the canard. .....Your canard should now be looking more like a canard, and less like a lump of foam and glass. |
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