Picture 1--I received the screws I ordered from Microfastener.  The one on the top is a 6-32 nylon Phillips head screw 1" long.  The one on the bottom is 4-40 Allen Head Cap Screw with an unbelievable length of 3".


Picture 4--This shows the 6-32 nylon Phillips head screw cut to a 5/32" length and screwed into the white plastic insert to retain the 1/8" dowel.

Tandy

I decided I wanted to put a tail wheel on the Airborn so I picked up a 3/4" tail wheel at the hobby shop.  The first picture below shows a close up of the tail wheel installation using 1/16" piano wire.  The second picture shows the fuselage frame up on the gear.

Picture 2--This shows the ignition cut off module in the off position.

Picture 4--This shows the ignition cut off module mounted inside the fuselage looking through from the left side of the fuselage.

The S4 stab center plate is laser cut from 1/4" sheet balsa and this particular one was relative soft.  The decision was made to push 4-40 nylon screws through a stab mount on the fuselage and screw them into threaded inserts in the S4 stab plate to mount the stab to the fuselage.

To accomplish these threaded inserts, the holes in the plate were carefully drilled out on a Micro Mark drill press so that a 1/4" K&S plastic tube would slip into the holes snugly (a piece of this plastic tube is shown laying on top of the S4 plate).  The four outer tubes were pre threaded with 4-40 threads before they were CA'd in place.  Then the ends of the tubes were sanded flush with the surface of the S4 plate.  Notice the 4-40 nylon Allen Head Cap Screw threaded into the tube in the upper left corner of the S4 plate.

The two center holes are for attaching the fin to the top of the stab.  2-56 nylon screws will be used in the attachment and these screws fit nicely into the unthreaded holes of the 1/4" K&S plastic tube.  When these tubes were CA'd into the S4 stab plate, they were recessed such that the head of the 2-56 nylon screw would be counter sunk in the S4 plate.  As you can see, one of the 2-56 nylon screws is inserted in the front hole.  The depth of the recess can be seen in the rear hole.

To stiffen the S4 balsa plate, notice that pieces of 1/16" X 1/4" balsa strips were glued to the chord wise edges.

Today, I did the finish sanding on the horizontal tail ictured below.  The first picture shows the stab and elevator separated.  You can see the 1/16" piano wire coupler for the the two elevator halves in the center of the picture.

The second picture is a close up of right side to show the six embedded nylon hinges and the 0.31" piano wire continuous hinge pin.

The third picture shows the horizontal tail assembled.  There are left and right continuous wire pins holding the three hinges on each side together.  Retention of these pins will be the subject of a latter report.  The spruce insert on the left elevator side will be drilled and tapped with 2-56 threads for mounting the nylon control horn on the bottom.  I also added 1/16" balsa gussets to the T.E. ribs of the elevator to better support the T.E.

Now it is on to bulid the fin and rudder................Tandy

Picture 2--The long 4-40 AHCS will be for installing the engine with a plywood spacer similar to the one shown that I used on the Bomber.  This spacer is to achieve the proper balance by moving the engine forward of the firewall.

Picture 3--This is repeat of the right side of the fuselage to show the tip of the 1/8" dowel inside the white plastic insert.  The insert is threaded with 6-32 threads, but still permits the the 1/8" dowel slide through to pin the coil in place.

Picture 1--This shows the ignition cut off module made out of a small servo control arm and a Radio Shack No. 275-016A lever actuated micro switch mounted on a piece of 1/16" plywood.  The two perpendicular arms were cut off and the hole in the control arm was plugged with a piece of a dowel.  The dowel was centered drilled  and a metal sleeve was slipped in to form a bearing for the control arm to turn on.  The micro switch is shown in the on position when the wires are soldered to the center and outside lugs.

Picture 3--This shows the fuselage mount for ignition cut off module on the right side of the fuselage.  It is a piece of Lite Ply glued flush with the structure.  Notice that the two holes are lined with pieces of K&S plastic tubes sanded flush with the Lite Ply surface.  This prevents the screws from crushing the wood when they are tightened down.

Here is the lay up of the elevator I did this morning with the finished stab in front..............Tandy