Ch. 10-12

 


Chapters 10-11-12
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Chapter 10
04-05-2007
doubleclick pics for larger images
The pictures don't show the layup on the bottom, but I put the BID down like fig.39 in the plans and then laid the UND on top. The BID does butt on the joints at the outboard areas and so overlap at the centerline is important.  The top skin is more complex, and I will just refer you to the plans.



The first pic is of the left and right wingtips. Since they curve up more, I could recess the hinge pin and add a cover. My core length is 141 inches. They are from Featherlite and so the shape is great. Now, back to the pics. The other end of the hinge pin is limited from sliding by an AN3 bolt. The third pic is what you seen in Ch. 10 page 3 in fig. 19 and 20. The red dots with black circles are the dowel holes (see fig. 11, pg. 10-2.) The fourth pic shows the sheer web face with the aluminum inserts under the glass. In the last two pics, I laid the large drawing of F-22 (that I used to make F-22) on the lift tab hard points and verified the spacing and position. In chapter 11 there is a pic of the lift tab and F-22 together. A recent posting, called into question, the use of the large size drawings, but if you do this, then you can catch any problems. I figure that some builders get the lift tabs placed a little off and then they point to the F-22 size as the problem.



I messed up the order on the pictures. The second picture shows the dispenser for the sparcap fabrication. I found out when I did the main wings, that it works better to have the dispenser off center to pull out the UND glass, cut it to length and then just slide it over into place. The first pic is of the quick disconnect for the cable. I used a small piece of LG bulkhead hardpoint scrap and drilled a hole in it and embedded it. The last pic is of the antennae with the toroids. Make sure that you take enough foam away under the solder points to have micro above the solder joints to protect them from vibration and separation.
Note: If you want to order the componets for antennae assembly here are the AS numbers:
11-12900 Copper Antenna tape 3/8" 1 roll
11-09900 Torroids for Quickie antenna KT-3per antenna
The coax cable is available from a "CB" shop. 
Note: The coax called for is not your larger cable TV type. 

 



Chapter 11
06-2007


The first pic shows the elevators with the tubes microed in place. Next the hinge pin is inserted. The trick to get the hinge pin to slide in is to turn the elevator upside down, or at an angle, so that the sag of the long pin will not carry it away from the next hole.
The next pic is of a rivet, but the deal is to be sure to drill perpendicular to the surface. If you have "drill tracking" issues, you can always use a dremel stone and make a very small flat spot at the point to drill. The hinge pin is inserted in the next to last picture. The last picture is of the template for hinge pin position. I transferred the rotation point to the board. In the first picture below, you see how that I made a plywood template of angle of deflection to measure the elevators for good function.

The second picture is of the wing tips with base to base for symmetry check. In the fourth picture, the canard is upside down. I used a small piece of LG bulkhead scrap and two #10-32 by 5/16th inch Tee nuts. The hinge pin has a hole drilled through it at the end for an alan wrench to help slide it out. The last picture shows the cutout for the balance weight to fit into. I added the ice shield.
 
This shows the AN3 bolt that limit the inboard movement of the hinge pin. The second pic shows the cover and the ice shield, before the finish of the interior of the shield. The last pic shows the foam form in place before glassing. The plans say wait until after the finish work, but I did it right before the micro finish work. I put micro on the exterior of the shield and used some epoxy and a brush to make an even finish.

Chapter 12
11-2008

See chapter 18 for the FHC work and more on this area of the plane.
Pic#1:  The alignment pin was removed and I placed an AN3. Bernard Siu placed an AN3 bolt, but made the bolt face forward. There are two reasons to make this change. The alignment tab is a little more secure for one, but the best reason is that it allows the room forward of F-28 to be strengthened for the FHC work. When I say more secure, I am thinking of added resistance to flutter. I have good elevators, but the moment of rotation for flutter is decreased by securing the alignment tabs and securing the canard cover to F-28. We have all seen road signs on a single post and have the wind make it "flutter" around the single axis (post). If you have two post that are even six inches apart, then the flutter is decreased or prevented. You have to have flexing and a rebound effect and the right angle of attack from the wind to start of the flutter effect. 
The foam piece is 30 inches wide and 1.5 inches wide. I found that a 2.0 wide piece would still allow insertion of the canard into position, and so I backed off that number some for ease of insertion.
Pic#2: There is a 4 ply UND layup placed over the Tee nut at the alignment bolt position. I rounded the edges of the fuselage outboard of the alignment tabs and overlapped onto the fuselage a couple of inches. See chapter 18 for the FHC work.
Pic#3:  The incidence check is finally posted. I really, really, don't want a deep stall.