Sep 23, 2026 · 1h 7m
Fountain pens turn fluid dynamics into a personal ritual
The Fluid Dynamics of Fountain Pens
The episode shows how capillary action, air pressure and nib design make an everyday writing tool a compact lesson in engineering and preference.
- 1Fountain pens balance capillary action, surface tension and air pressure to deliver ink without overwhelming the page.
- 2Flexible nibs and vintage filling systems reveal how mechanical design shapes handwriting, line variation and writing speed.
- 3The discussion connects misleading language, aircraft flight and early culture to the limits of simple explanations.
Don't miss
Hannah Fry turns the fountain pen’s feed, breather hole and nib into a clear demonstration of the delicate balance governing ink flow.
The brief
Hannah Mary Fry introduces Michael David Stevens to her fountain-pen collection, using affordable, vintage and luxury instruments to ask why writing tools became objects of taste.
The core lesson is fluid dynamics in miniature: nib channels, feeds, breather holes, capillary action and air pressure must cooperate to keep ink moving at the right rate.
Vintage Waterman pens and Parker filling mechanisms make the engineering tangible, while flexible gold nibs show how design changes line variation, writing speed and feel.
Luxury brands such as Montblanc and Pelikan sharpen the episode’s central tension: price and prestige matter less than weight, stiffness, width and personal preference.
The conversation then widens from misleading words and flawed explanations of flight to the emergence of language, culture and the first salt-seasoned food.
Featuring
Hannah Mary Fry
Michael David Stevens
Pelikan
Soul DustBooks & mentions
Listen to the full episode and explore every guest, topic, and moment on PodLume.