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Gemini GT-40 build

Old 01-21-2013, 07:36 PM
  #1  
jim19
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Default Gemini GT-40 build

I am in the process of building a Gemini GT-40 and decided to post a thread on the construction of this model. The one being built will be powered by 2 OS .45 engines and will be using SpringAir retracts. First pic shows the layout of the basic fuselage components with doublers glued to the fuselage sides and bulkheads. Pic 2 shows the fuselage assembly beginning with the main bulkheads epoxied in and the wing mounts installed (fuselage has been taken off jig for theses pics). Pic 3 shows the remaining bulkheads, stabilizer saddle and nosegear mount installed. Pic 4 shows the fuselage top sheet installed. Pic 5 shows the elevator and rudder pushrod outer tubes installed. Pic 6 shows the aft fuselage bottom sheeting, forward fuselage sheeting and nose block installed.
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Old 01-22-2013, 04:04 PM
  #2  
jim19
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Default RE: Gemini GT-40 build

Pic 1 shows the basic wing components. doublers are glued to the nacelles and wing ribs as required. Pic 2 shows the wing structurally built and taken off the jig. This wing is built in three sections. Center section is ready to align to the fuselage. Pic 3 shows the flag jigs in place with the airframe side flap hinges epoxied in place. Pic 4 shows the main gear mount installed and the cutouts for the wheel well. Pic 5 shows the inner sheeting installed for shaping the wheel well. Rib is also cutout for serrvo installation and lower cap strips installed.
Old 01-22-2013, 04:08 PM
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jim19
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Default RE: Gemini GT-40 build

Don't know why the pics didn't show up in the last post, but here they are.
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Old 01-23-2013, 08:17 PM
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jim19
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Default RE: Gemini GT-40 build

Pic 1 shows whell well lining (1/16" balsa) installed and bottom of wing sheeted. Pic 2 shows forward nacelle top installed and top of wing sheeted. Pic 3 shows tank and servo access cover in place and botom aft nacelle assembled. Pic 4 shows top aft nacelle assembled.
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Old 01-23-2013, 08:19 PM
  #5  
jim19
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Default RE: Gemini GT-40 build

Pic 1 shows whell well lining (1/16" balsa) installed and bottom of wing sheeted. Pic 2 shows forward nacelle top installed and top of wing sheeted. Pic 3 shows tank and servo access cover in place and botom aft nacelle assembled. Pic 4 shows top aft nacelle assembled.
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Old 01-24-2013, 08:26 PM
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jim19
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Default RE: Gemini GT-40 build

Pic 1 shows aileron hinged (not glued in) and set in place. Pic 2 shows flap guide wire in place and surface side flap hinges in place. Guide wire aligns these hinges. Pic 3 shows flap set in place and hinges epoxied in flap. Pic 4 shows wingtip installed.
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Old 01-26-2013, 02:23 PM
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jim19
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Default RE: Gemini GT-40 build

Simple cowling assembly. Pic 1 shows cowl mounts installed and engine temp mounted. Spinner backplate is tack glued to spinner ring using 3/32" balsa spacers. Pic 2 shows cowl side attached to nacelle and glued to spinner ring. Pic 3 shows cowl top and bottom attached to cowl and glued to spinner ring and cowl side. Once glue has cured, spinner backplate and engine are removed. Pic 4 shows balsa triangle fillers in place. Pic 5 shows cowl sanded to shape.
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Old 01-30-2013, 02:16 PM
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jim19
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Default RE: Gemini GT-40 build

Pic 1 shows wing center section in place on the fuselage, forward wing pegs and wing mount bolts installed. Pic 2 show bottom sheeting installed and wing bolt holes counterbored for recessed bolts. Pic 3 shows center section top sheeting installed and cut out for flap servo and servo wiring. Pic 4 shows main turtledeck bulkheads and turtledeck sides glued in. Pic 5 shows remaining bulkheads glued in and side pulled together for proper contour. Pic 6 show turtledeck top sheeting installed.
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Old 01-30-2013, 02:20 PM
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jim19
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Default RE: Gemini GT-40 build

Pic 1 shows empennage assembly assembled, rudder and elevators sanded to taper at trailing edge. Hinges are in place but not glued in. Pic 2 shows ventral fin installed. Pic 3 shows empennage set in place for check fit. Model is now ready for filler (light-weight spackiling compound) where needed and final sand, then covering.
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Old 01-30-2013, 07:07 PM
  #10  
hoops
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Default RE: Gemini GT-40 build

Jim, you make it all look so simple and straight forward.
Nice work.
Old 02-04-2013, 03:34 PM
  #11  
jim19
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Default RE: Gemini GT-40 build

This Gemini GT-40 is finished. Model is assembled, engines, retracts and radio installed.
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