Smokestack Lighting Question for industrial modelers

The total skiny:

https://www.flashtechnology.co...ghting-requirements/

I did not read through it but perhaps your answer is in there.

"The train I ride on ..."

Everything you need to know about Smokestack Lightning is right here:

https://youtu.be/HTDjD_UdJYs?l...HTDjD_UdJYs&t=60

DAB

Did some searching and found an official FAA downloadable PDF document here

https://r.search.yahoo.com/_yl...5uy4JXJBOuw0XwS8U1A-

More or less says the flashing lights flash about 30 times per minute and they flash in sync with each other.

A stack at a power plant I previously worked at had red lights on side continuously lit during night with the top light flashing to alert aircraft.

As an aside, the original switching device slowly rocked a horizontal tube filled with mercury.  Tipped one direction contact was made and the other direction contact broken to create the slow "flashing" effect.  The pace of the flashes (e.g., once per 5 seconds) for towers > 200' is printed on aviation maps.  It shows the pilots where the towers are for avoidance but also provides them landmarks by which to navigate. 

@Todds Architectural Models's guide seems to suggest all lights flashing at once at 20-40 flashes per minute but that guide isn't very clear.

@BillYo414 posted:

@Todds Architectural Models's guide seems to suggest all lights flashing at once at 20-40 flashes per minute but that guide isn't very clear.

Typically obstruction lights flash nominally at 30 times a minute.  The range of 20 to 40 goes back to a time when flashers were mechanical with a bunch of variation.  Solid state flashers have been around for over 30 years and are pretty accurate.

@JET posted:

Did some searching and found an official FAA downloadable PDF document here

https://r.search.yahoo.com/_yl...5uy4JXJBOuw0XwS8U1A-

More or less says the flashing lights flash about 30 times per minute and they flash in sync with each other.

Thanks, but the link didn't actually do anything.

I downloaded something like this awhile ago and now can't seem to find it. 

I am fairly sure that FAA regulations have changed over time regarding this particular situation.

Regardless, thank you for looking for me.

George

Maybe your antivirus software is blocking something, I just clicked on it in your post and it opened a window to download  and save    AC_70_7460-1L_.pdf

@Rich883 I kind of thought 20-40 seemed like a big range and that all the lights I have ever seen looked the same. So that explains it.

@JET posted:

Maybe your antivirus software is blocking something, I just clicked on it in your post and it opened a window to download  and save    AC_70_7460-1L_.pdf

Thank you.  That was exactly the problem - an overzealous ad-blocker.

George

Interesting stuff!

Thank you all for your contributions to this topic.

George

It takes the FAA 90 pages to tell you that a tower over 200 feet should have flashing lights!