Thermic 75E (oz16266)
About this Plan
Thermic 75E. Radio control powered glider model, for electric. Wingspan 75 in, wing area 440 sq in.
Quote: "Steve, I am attaching a plan for a revised Thermic 100 (oz1573) called the Thermic 75E... Thanks for all you do!
Jim Zare"
Direct submission to Outerzone.
Quote: "I finally decided to create a modern version of the classic Thermic gliders. The reimagined Thermic 100 was down sized to 75” and retains the look of the original with electric power and great soaring capability. Thermic 75E Design features:
• Thermic Plan form
• 75” one piece bolt on wing (to fit into my car)
• One set of spars instead of 2
• Flat center section
• Spars built as first step in assembly to assure dihedral
• Flat bottom airfoil
• Every other wing a stab rib eliminated
• Stab airfoil and plan from original reduced to 75%
• Fin and rudder moved forward to the stab
• Fuselage constructed from 3/16” sq. balsa with 1/64” ply liners at front and bottom
Construction:
Wing: The wing is very conventional. Since it is a bolt on wing leave the sheeting off the center section until the carbon fiber wing hold down tube is epoxied in place while the wing is temporarily rubber banded to the fuselage.
The plan shows optional spoilers which are quite effective.
Stab, Fin and Rudder: The stab is built just like the original with one key difference. A slot is left at the center for the fin to slip in.
Fuselage: Build each side over the plan and glue the 1/64” ply reinforcement liner at the front. Glue formers F-4 and F-5 in place with the fuselage sides pinned vertically to the plan. Then pin the fuselage sides together at the rear over the plan and add the crossmembers etc.
Use the mounting plate from the motor you select as a drilling template for former F-1. Epoxy F-1/ F-2 in place add the 1/64” plywood bottom and fabricate the magnetic hatch..."
Update 21/10/2025: Replaced this plan with a minor revision, thanks to JimZare.
Quote: "Steve, I edited out the horizontal line that appeared on the original Thermic 75E plan that I sent you. I also showed the Cobra motor name."
Supplementary file notes
Build notes.
Previous scan version.
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User comments
I am using a Cobra 2208-26 motor with an old Graupner 7-1/2- 4 folding prop and Cobra 22 Amp speed control. I power it with a 3s 30c 800 mah Lipo pack. The motor and speed control was purchased from https://innov8tivedesigns.com here in the United States. This motor weighs 46.5 grams. I think any 22 mm motor/propeller combo that yields 150 watts would work, even less wattage if you don’t need a fast climb for a contest.JimZare - 21/10/2025
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- Thermic 75E (oz16266)
- Plan File Filesize: 382KB Filename: Thermic_75E_oz16266_.pdf
- Supplement Filesize: 70KB Filename: Thermic_75E_oz16266_build_notes.pdf
- Supplement Filesize: 384KB Filename: Thermic_75E_oz16266_previous.pdf
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Notes
* Credit field
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Scaling
This model plan (like all plans on Outerzone) is supposedly scaled correctly and supposedly will print out nicely at the right size. But that doesn't always happen. If you are about to start building a model plane using this free plan, you are strongly advised to check the scaling very, very carefully before cutting any balsa wood.
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