Link webs: a second crank throw on the first crank pin — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/tri-clamp-rd-link-webs/  (CC BY 4.0)
Basis: Design values (pin radii and angles set by the engines' kinematics); Ø3 dowel pins (ISO 8734)
Catalog version: 2026-10-20

Sizes: see table below
- The web is pressed on crank pin 1 (which is pressed in the crank disc) and carries crank pin 2. The power con-rod runs on pin 1 between the disc and the web; the displacer drive runs on pin 2 outside the web. The shaft ends at the disc, so nothing crosses the con-rods' path.
- Beta web: pin 2 at the same 10 mm radius, 90° from pin 1. Gamma web: pin 2 at 7 mm, 45° from pin 1; with the bell crank's own lag the displacer leads the power piston's volume by close to a quarter turn.
- Turn the web over to swap which way pin 2 leads: the web is the same both ways.

part  pin1_radius_mm  pin2_radius_mm  angle_deg  thickness_mm
rd-link-web-r10-90  10.0  10.0  90.0  14.0
rd-link-web-r7-45  10.0  7.0  45.0  14.0

Files elsewhere (not hosted by Xem Studio; license as stated by the publisher):
- Long Earth Society: Engine builds — web, video — LES site — https://longearthsociety.com/engineering/

Free files (CC BY 4.0, Xem Studio; STEP + STL, 2 parts): https://xemstudio.com/files/hardware/tri-clamp-rd-link-webs/index.json
API: https://xemstudio.com/api/geometry?object=tri-clamp-rd-link-webs