The Yellow Flag of Quarantine

Ships have used flags for signalling for centuries. One of the more obscure flags is the Quarantine Flag, the purely yellow flag shown above. It’s a specialised flag like the better-known diver’s flag. Its use has changed over the years; a brief summary of that use comes from here:

There is no signal in the International Code of Signals for ‘quarantine’ (indeed the word ‘quarantine’ does not appear in the code). Today ships signal either ‘ My vessel is “healthy” and I request free pratique’ with a single Q (Quebec) flag or ‘I require health clearance’ with the double signal QQ (Quebec Quebec). Either is correct for a vessel yet to be cleared for pratique (pratique is permission to do business at a port, granted to a ship that has met quarantine or other health regulations). The Q (Quebec) flag is square in shape and pure yellow. Continuing to fly either of these signals indicates a vessel is yet to receive clearance (and is thus effectively in quarantine). Once the local authorities have determined that the ship’s health problems have been resolved and removed a quarantine order, the ship may strike the signal and raise the national ensign for the port they are entering.

In the days of COVID-19, this flag should be getting a workout. So if your vessel (or house, etc.) is under quarantine (like some of the people taking this course) you should strike whatever flag you might be flying and hoist this one.

Belmont Harbour in Chicago — Construction and architecture

Belmont Harbor is located in the heart of beautiful Lincoln Park and is one of the largest harbors in the Chicago Harbors system. A favorite among families and long-time boaters, the harbor is surrounded by acres of park space and a beautiful skyline view to the south. There are 818 slips, mooring cans, and star […]

via Belmont Harbour in Chicago — Construction and architecture

Belmont Harbour is the main location for the Chicago Yacht Club, which played a central role in the Warringtons’ yachting history for most of its duration.  It’s located in Lincoln Park; the Chicago Yacht Club merged with the Lincoln Park Yacht Club in the early 1920’s, and the CYC adopted the Lincoln Park’s burgee as its own.

An aerial photo of Belmont Harbour in the late 1940’s or early 1950’s is below.  More photos from that era of the Chicago Yacht Club are here.

Belmont Harbor

Belmont Harbor, Chicago, late 1940’s or early 1950’s.

Case Study: Accurate Performance Predictions for Marine Propellers — Another Fine Mesh

This case study presents the benchmark validation of CFD simulation results of the Potsdam Propeller Test Case (PPTC) using CFD Support’s TCFD flow solver with a Pointwise mesh. PPTC is a marine propulsor that was extensively measured by SVA Potsdam. The aim of this benchmark was to evaluate the combined use of TCFD with Pointwise […]

via Case Study: Accurate Performance Predictions for Marine Propellers — Another Fine Mesh

Built for the Crimea – Broken up at Charlottetown: The Long Life of the Steamer M.A. Starr — Sailstrait

Today warships are rarely converted for commercial use but up until 1900 many naval vessels were not much different in design from their civilian counterparts. One ship with a naval beginning was a regular sight in Charlottetown harbour for more than twenty years – and may still be resting beneath the harbour’s sand and mud. […]

via Built for the Crimea – Broken up at Charlottetown: The Long Life of the Steamer M.A. Starr — Sailstrait

Happy Fourth of July from Chet Aero Marine

Yacht Ensign

The Yachting Ensign, which graced many of the boats the Warrington family voyaged on during their years on the water.

Some examples of that can be seen below, on our yachts and others.