What’s on the Drag & Lift poster
A 5-row table: Body · Drag coefficient · Note.
Drag force = ½ρV²ACd. Values are for the turbulent regime, frontal area.
- Flat plate, face on — about 1.2 — Almost all pressure drag
- Smooth sphere — about 0.47 — Drops near Re 3×10⁵
- Cylinder, cross flow — about 1.2 — Sheds vortices
- Modern car — 0.25 to 0.35 — Frontal area
- Streamlined aerofoil — about 0.04 — At a low angle
Drag goes as velocity squared, so the power to overcome it goes as velocity cubed. Speed is expensive.
Questions about the Drag & Lift poster
- What’s on the Drag & Lift poster?
- A 5-row table: Body · Drag coefficient · Note. Drag force = ½ρV²ACd. Values are for the turbulent regime, frontal area. Flat plate, face on — about 1.2 — Almost all pressure drag; Smooth sphere — about 0.47 — Drops near Re 3×10⁵; Cylinder, cross flow — about 1.2 — Sheds vortices; Modern car — 0.25 to 0.35 — Frontal area; Streamlined aerofoil — about 0.04 — At a low angle. Drag goes as velocity squared, so the power to overcome it goes as velocity cubed. Speed is expensive.
- Who is the Drag & Lift poster for?
- Drag & Lift belongs to the Mechanical Engineering section rather than to a school year, because engineering is not something one grade owns. Anyone learning thermofluids can pin it up — a beginner, a student mid-course, or someone revising years later.
- When should you use the Drag & Lift poster?
- Vehicle, wind load and fan calculations, or any external flow estimate. A wall chart earns its place by being glanceable from where the work is happening, so Drag & Lift belongs on the wall where that engineering work actually happens, within glancing distance, rather than filed away.
- What other posters go with Drag & Lift?
- Bernoulli's Equation, Continuity and Entropy & Irreversibility sit alongside Drag & Lift in the Mechanical Engineering section. Printed together they make a wall rather than a single sheet, which is how a reference set actually gets used.Bernoulli's EquationContinuityEntropy & Irreversibility
- Is the Drag & Lift poster free to download and print?
- Yes. Drag & Lift downloads as a free PDF with no account, no email and no watermark, like everything else in the Mechanical Engineering section. Print as many copies as you like for a home, a classroom, a library or a tutoring group; reselling the file is the only thing the licence rules out.Read the licence
- What size does the Drag & Lift poster print at?
- Drag & Lift is a vector PDF laid out for US Letter, and prints on A4 with Fit to page — the same file, no separate download. Because every mark on it is drawn rather than photographed, it stays sharp enlarged to A3, A2 or A1 at a copy shop. Colour carries emphasis only, so a greyscale print of Drag & Lift loses nothing.Printing guide
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