Prebuild questions for Sig 4star 120
11-09-2013, 06:33 AM
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Prebuild questions for Sig 4star 120
Hey Gang
I wander about thinking about building airplanes that I would have to buy, I just thought I should instead do the ones I already have. I am almost finished with a Telemaster I will use to teach someone to fly, then I plan to go ahead and do a Sig 120 that's been on my shelf for sometime. Having little experience with some of the newer processes I was wondering how big of a trick it would be to build it so the main wing will come apart for transport. I don't remember the exact wingspan but as I recall it's in the neighborhood of about 80"
Are there any tutorials here that anyone would know of that would help to do this.
I wander about thinking about building airplanes that I would have to buy, I just thought I should instead do the ones I already have. I am almost finished with a Telemaster I will use to teach someone to fly, then I plan to go ahead and do a Sig 120 that's been on my shelf for sometime. Having little experience with some of the newer processes I was wondering how big of a trick it would be to build it so the main wing will come apart for transport. I don't remember the exact wingspan but as I recall it's in the neighborhood of about 80"
Are there any tutorials here that anyone would know of that would help to do this.
11-09-2013, 01:24 PM
#2
Well I had an ARF that the wing parted during flight which was a two piece design. SIG replaced it with a kit, and the wing is about 84", I cut it down one bay and its 75" now, but solid. I also carved rounded tips for the wing, so if you dont and just use what comes with its about 72 or so inches wide.
If I were to make it a 2 piece wing, I would get either a carbon fiber, or aluminum tube, and either a slightly larger CF, or Fiberglass tube for each wing panel. Between the spars is where I would put the tube, and epoxy it in REALLY good, this is where the ARF failed, it used an aluminum joiner bar and plywood boxes that did not extend up past the spars. At the trailing edge I would have a metal rod glued in one panel that slid into the other panel to align them. Then at the leading edge a dowel in each panel like the plans, and the two bolts at the rear should keep them together.
If you cant find an outer tube that fits snug, you could make one on the tube you plan to use by wrapping a layer of wax or parchment around the tube and make the outer tube with fiberglass and epoxy. The length and diameter is determined by the dihedral you plan to use. If you goi flat with no dihedral then the tube can be 4-5 bays long in each wing and large enough to fit between the spars with the outer tube glued right to the spars.
Here is the wing joiner from the arf to give you some reference.
If I were to make it a 2 piece wing, I would get either a carbon fiber, or aluminum tube, and either a slightly larger CF, or Fiberglass tube for each wing panel. Between the spars is where I would put the tube, and epoxy it in REALLY good, this is where the ARF failed, it used an aluminum joiner bar and plywood boxes that did not extend up past the spars. At the trailing edge I would have a metal rod glued in one panel that slid into the other panel to align them. Then at the leading edge a dowel in each panel like the plans, and the two bolts at the rear should keep them together.
If you cant find an outer tube that fits snug, you could make one on the tube you plan to use by wrapping a layer of wax or parchment around the tube and make the outer tube with fiberglass and epoxy. The length and diameter is determined by the dihedral you plan to use. If you goi flat with no dihedral then the tube can be 4-5 bays long in each wing and large enough to fit between the spars with the outer tube glued right to the spars.
Here is the wing joiner from the arf to give you some reference.
