NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Frank Reed
Date: 2025 May 21, 09:37 -0700
Gary L: Thanks for that video link. Very informative.
Here's another detailed account, released yesterday evening, passed along by a tugboat driver friend of mine:
https://www.youtube.com/watch?v=kaCol5aijgw
A few features worth seeing in this account... There's new video from the west side of the river showing details of the departure including the positioning of the tug. Also there's a good discussion of the CPP, controllable pitch propeller, which enables efficient engine operation with no significant transmission gearing. And the video creator found a nice bridge tour that leads to a discussion of the CPP control procedures. This is not an exotic technology, and, as I understand it, the common ducted "thrusters" in modern vessels that allow precise maneuvering of ferries at pier, for example, usually have propellers with variable pitch that permit rapid thrust reversal.
Frank Reed
