Peterson Chamfering Stem Tenons

[Kyle Weiss]

I'm the farthest thing from a Pete expert there is.

However, I did notice, having checked out plenty of newer (as in, the last few years) Petersons, and many of them up until recently didn't have that "trumpted" shape at the tenon in the stem (also known as "chamfered") where a 45° funnel is added to aid in draft dynamics.

The Peterson event at my Tinder Box allowed me to see plenty of pipes, and a majority of them had chamfered tenons, the only exceptions usually being System pipes. My new Killarney had a stem that was partially chamfered, and others were edited all the way to the edge.

My Fermoy 80S I got some months back, didn't have any chamfering. So, I continued where the Killarney (Red) left off, and added this feature to my Fermoy (Thurston), and even on Dinky, my 70s Pete 80S. It seems to cut down on the turbulence and moisture condensation in many pipes, not just Petes. I notice many "better" pipes (i.e., more expensive) often employ this feature.

It makes me wonder why they didn't do this sooner (perhaps they have), and why they started now...or, why some are only partially done.

Pete experts, what say ye?

8)

 

[Anonymous]

It isn't just on Petes, Kyle. Any time you have much more headspace than the thickness of a business card, +/or a mismatch between the diameter the shank is drilled to vs. the entrance diameter in the tenon, you create turbulence, which creates condensation. Fluid mechanics. GLP's done some riffs on it.

Countersinking the end of the tenon cuts down on this.

In a "system" Pete, the whole point is to create turbulence and precipitate the moisture out of the smoke stream. Putting a metal (cooler temperature) stinger into the picture condenses still more.

:cat:+ :face:
OREO & YAK

 

[SpeedyPete]

I've modified all my pipes, where possible, like this. On most of them it made a difference (stopped the gurgling and/or smoked drier) but a few of them did not respond in any way.

 

[Kyle Weiss]

Yep, I noted it wasn't just in Petes, and yes, Peterson was into trapping the moisture in a different area, rather than bowl or stem--which, good on them. Still, it makes me wonder why they suddenly changed it up.

I notice my Petes doing better with this countersunk feature at the tenon, so I'm glad they're starting to do this in the factory...hopefully it'll be a more consistent effort.

8)