Uploaded January 2025 | Updated September 2026, 1 hour ago

---

New year, new project. I love the design of the little 309cc Redrup radial engine, so lets start building one.
___________________

These are affiliate links, so if you purchase through then, a small percentage of the profits will contribute to the channel. It costs no extra for you. Thanks.
Buy Bill Fairney's Biography of Charles Redrup
USA Link - amzn.to/4beyjg4
EU Link - amzn.to/3Qx0JbB

Buy Steve Chastains DIY Piston book New:
stephenchastain.com/store
Buy Steve Chastains DIY piston book used:
USA Link - amzn.to/4hjkZZz
EU Link - amzn.to/3EbAXql

UHU liquid metal
EU-link - amzn.to/4hkITEd
____________________
If you enjoy my content and would like to support my channel... I'd really appreciate it.
Please join me on Patreon and help build this community.
patreon.com/RotarySMP
or sign up for youtube memberships using the "JOIN" button above.
or please just buy me a coffee...
tinyurl.com/5cv2yscb
____________________
If you are interested in a Bambu Lab printer or filament, please use this affiliate link which will get you a discount, and Bambu will share a small portion of their profit to help support my channel. Thanks.
shrsl.com/2o4uj-2yn7-1cwx9
________________
00:00 - Intro
00:18 - Why start a new project?
00:59 - Charles Redrup
01:23 - The 1920 Redrup radial
05:53 - Starting the CAD model
07:22 - Modelling the piston
09:35 - 3D printed pattern and core moulds
13:41 - Making cores
_______________
Music
Florian - The Stomp
Sabbo - Trees in the Breeze
Tomer Ben Ari - On the Morning Joy