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Building a Sig Mid-star 40
 
Author: Juergen W Stolte

At the beginning of 2007 I got myself a kit to build a Mid Star 40 plane. It sat around for a short while as I finished a rebuilt and complete recovering of an LT40.

When I opened the plan for the wings I had my first surprise. Part of the left wing panel was attached to the right panel and the remainder was shown below it. Since I was going to start with the right one anyhow, I did not give it too much thought. The pieces for the right wing fit nicely together and it did not take all that long before the wing was glued together.

Working on the left wing was a different matter. Now that I was acutally ready to build it I had to give it some thought. Cutting out the missing part and attaching it to theright wing drawing in my opinion was a stupid idea by SIG. Why could they not have put one whole side above the other?

I decided to use the right wing drawing to build the left side. It was not until I glued the first three ribs onto the lower spar that I realized that the rib spacing is idfferent on the tip than in the center. I had to break them loose again, mark the proper spacing onto the plans and start over again. Needless to say I was not very happy with SIG's design. From there on the wing came together as easy as the other one.

Before I joined the two sides I was trying to figure out how to ensure the wing dowel will line up with the slots in the two center ribs. I could see that I could very well make a mess, drilling without seeing where I was going. I decided the best way for me was to install the dowel in one wing section before gluing the two together. It worked for me.

I didn't make any notes about problems with building the fuselage and I do not recall having any. Things must have gone according to the instructions.

Finishing the wing using the instructions, lining it up to drill and tapp for the wing bolts went well. I encountered no problems.

For awhile I started to cover the fuselage, stabillizer and fin before joining them. Too make the final assembly a lot easier, I used 1/8 inch dowels to locate the stab and fin on the fuselage after lining them up with the wing and fuselage. It makes it easy to remove the excess eepoxy when joing them without have the parts shift.

A bit of a setback was the separation of the canopy from its base after joining them with caulking as recommended by SIG. I fixed that with a strip of black self adhesive decal. There was also a bit of a problem finding an old servo tray because SIG does not include one with the kit, recommending using one from a radio kit.

A challenge was to cut slots into the tapered 5/32 inch rudder and aileron blades. The balsa was so thin that even pushing the Easy Hinges in cut through the remaining balsa. It also makes it impossible to install screws to hold the shock absorbing fuel tubing for the tail wheel on the rudder. I ran fiberglass tape over the tubing and up on both sides of the rudder before covering. I hope that I do not need to repair it.

A real disappointment is the hardware SIG includes with the kit. I thought slotted screws went out with the French Revolution. An easy way of perforating the control surfaces when installing the self tapping screws witht he control horns.

In my opinion to make an ok kit into a great kit, it would need to fix that arrangement on the wing plan and have a good look at the hardware included with the kit.

I should find out soon how well it does in the air.
 

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Mid-Star#1
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Mid-Star#10
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Mid-Star#101
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Mid-Star#111
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Mid-Star#12
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Mid-Star#13
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Mid-Star#14
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Mid-Star#15
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Mid-Star#17
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Mid-Star#18
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Mid-Star#21
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Mid-Star#23
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Mid-Star#24
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Mid-Star#25
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Mid-Star#26
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Mid-Star#27
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Mid-Star#3
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Mid-Star#4
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Mid-Star#5
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Mid-Star#51
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Mid-Star#52
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Mid-Star#71
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Mid-Star#81
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Mid-Star#9
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Mid-Star#91
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Mid-Star-#2
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Mis-Star#61

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