CLOSE-UP VIEW: IGNITION OF FINAL RING
outside ring of fuel consumed, these students ignite the inner circle around the fragile
The students got inside the paper house. However, due to the
heavy load of uncomfortable smoke, they emerged and simply hopped across the backing fire,
in the foreground, as it consumed another 10 feet of fuel. What they graphically proved was
this: When dealing with backing fire (flames burning into the wind, where the heat is
directed down into the ground), the downward and away direction of the heat allows safe
passage through flames inside this sort of arranged and prepared ground.
Remember, with this method, head fires are not allowed to
happen. There is no head of heat free-running, because the ignition patterns are set only
inches in front of circular control lines. They simply cannot ever get strong and escape.
Metered application is designed to control heat release.
Note that the straw and hay are littered at least a foot deep.
This is an exceptionally heavy load of light, fast-generating fuel.
There was a 12 mph wind during these burns. Head fires
developed 8' long flame lengths when allowed to run free. Left alone, these developed the
power and speed to destroy the fragile home on our first lay-out of a house on an acre of