Themis 35

1. ✓Fits the 250 mm cube213.4 × 213.4 × 179.5
2. ✓Prop tip gap to the duct throat >= 2.0 mm (swept circle)2.47 mm
3. ✓Every prop reaches its full 45 mm radius (>= 44.5 mm)44.99 mm
4. ✓Swept prop discs clear of every other part, cables included, by >= 1.0 mm2.65 mm
5. ✓Pod sits >= 15 mm above the duct inlet crowns17.7 mm
6. ✓Downward camera's 127 deg diagonal view is unobstructedclear
7. ✓H-Flow's 42 deg view is unobstructedclear
8. ✓Feet are the lowest point, >= 5 mm below both lenses6.0 mm
9. ✓Camera fairing stays outside all four duct jetsclear
10. ✓No cable crosses a duct inlet0 found
11. ✓Pod electronics, battery and cables sit inside the streamlined skin60 parts
12. ✓No two pod component envelopes overlap0 found
13. ✓Every printed and carbon part exports as a watertight mesh22 parts
14. ✓Every printed and carbon part exports as one connected piece

Duct exit blocked outside each motor's wake: 7.6–7.9% on motors 1, 3 and 4; 12.8% on motor 2, which carries the H-Flow blister. The pod shades 19.3–20.0% of each inlet from above, 17.7 mm over the lips.

1. ✓Fits the 250 mm cube203.5 × 206.7 × 152
2. ✓Prop tip gap to the guard >= 2.0 mm (swept circle)2.42 mm
3. ✓Every prop reaches its full 45 mm radius (>= 44.5 mm)44.99 mm
4. ✓Swept prop discs clear of every other part, cables included, by >= 1.0 mm1.95 mm
5. ✓Pod sits >= 15 mm above the duct inlets22.2 mm
6. ✓Downward camera's 127 deg diagonal view is unobstructedclear
7. ✓H-Flow's 42 deg view is unobstructedclear
8. ✓Feet are the lowest point, >= 5 mm below both lenses7.0 mm
9. ✓Camera board clears the guard by >= 1.0 mm3.72 mm
10. ✓No cable crosses a duct inlet outside the plate's shadow (motor leads follow their arm)0 found
11. ✓Pod electronics, battery and cables sit inside the streamlined skin60 parts
12. ✓Every printed part and the drilled arm plate export as watertight meshes13 parts

With the motors inverted the arm plate sits upstream of each prop, covering 12.2–21.0% of the inlet (most on the front ducts, under the camera prongs). The guard's braces cross 2.0–2.5% of each exit. The pod shades 17.9–19.0% of each inlet from 22 mm above the guard. The H-Flow bridge's lip reaches 3.2 mm ahead of the guard.

• Thrust is estimated, not measured: 3.6–4.9:1 assumes 650–900 g per motor on 4S. Bench-test one motor, prop and ESC before buying the set.
• Lines marked Estimate need checking on delivery. They include the lens, the camera board's weight and hole pattern, the UWB board's mass and the capacitor size.
• The UWB board's antenna orientation on the hat needs a bench check: Qorvo's modules range most evenly with the antenna upright.
• Pi port heights come from the Pi 4. The PM02's size comes from a retailer, not Holybro.
• Structural strength, vibration modes, thermals in the pod and cable bend radii are not analysed. The ESC stack is now hard-mounted: on its silicone grommets the pod and battery would have rocked at an estimated 10–20 Hz.

• GEPRC publishes no drawing of the V2. The arm plate's outline and the guard's height (24 mm, ±3) are read off its photos: measure a kit before printing the pylon, bridge and feet.
• Thrust is estimated as on the custom frame (3.7–5.1:1). The guard is a slotted bumper rather than a shaped duct, so expect no thrust gain from it.
• The arm plate needs four Ø3.2 mm holes drilled for the ESC and pylon: the stock 25.5 mm pattern doesn't take the 20×20 ESC.
• Inverted motors take the CW props on the CCW positions: a prop turned upside down spins the other way.
• The H-Flow bridge's lip is the first thing to touch a wall head-on, 3.2 mm ahead of the guard.
• Shared with the custom frame: the estimated lines, the UWB antenna's orientation, Pi port heights, the PM02's size, and the unanalysed structure and thermals.