I guess pressure drop relative to the length of hose is a factor depending on the final output device being used.
(Hi Sprocket it was good to meet you in Lincolnshire recently - best wishes to you
![Smile :) :)](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
)
We use torch-on-felt roofing contractors regularly, some use less and some use greater hose lengths than others, however, the propane torches that are used differ very much from say a gas fire, most torches used have broad pattern flame spread as the material being heated requires little heat to softenmelt the backing compound to a bonding grade consistency.
In observation the flame from a roofers blowtorch appears very intense, but in reality it is spread wide producing a reduced overall heat over a broad area, or so it appears to me.
Hope the Prof comes along to clarify (or shoot me down
![Unsure :unsure: :unsure:](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
).
Fire in the hold
![Stick Out Tongue :p :p](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)