Okay, one last batch of vintage helicopter photos. My early flying was all in helicopters as a kid on a USFS helitack crew. Later on...in the 1980's...I worked on three different Spruce Budworm spray projects in Washington and Oregon. It was some of the most fun I ever had in my life but you couldn't get me to do it today even with a 45. In fact the FS probably wouldn't allow anyone to do it today for safety reasons.
The stuff sprayed was only lethal to moths and caterpillars and they had to eat it. They only eat during one of about 5 stages they go through in the worm state. Entomologists surveyed the timber areas each day to determine when the worms were ready to eat. The forest was broken up into spray blocks we marked from the air by hanging orange flagging in the tree tops.
I sat in the back of a Jet ranger and the pilot would pick out a good target tree to hang a ribbon in and make an approach to it as if he was going to land right in the top of the tree. He would flare about 10 feet away and I would throw the flagging which had a couple 2 inch washers tied on with 3 foot string. The whole thing accordion folded into a 3 inch square.
We would start the spraying at 30 minutes before sunrise and be able to spray for maybe 2 hours before the sun would cause the spray to start rising instead of falling or the wind would start to stir. My job was to chase the sprayers in a Jet ranger to help them find the spray blocks and keep them on the spray lines which could be a couple miles long. I got to be really good at reading contour maps and aerial photos. I also watched the spray nozzles to make sure one wasn't plugged or something. They were paid by the gallon and it worked out to about $1000 per minute of boom time for a Bell 205 or 212. Air speed was about 100mph and just a couple feet above the tree tops.
This is how the spray pattern should look. Helijet Bell 212


Flagging in the tree top. This is one I had hung and on a groomed snowmobile route. It stayed there for about 5 years. I would point it out to others when we were snowmobiling in the winters after that and say, "I hung that ribbon up there". It made for some good stories.

Stopping to clear a plugged nozzle. Tyee Airlines, Ketchikan. Bell 212

Sometimes I chased two sprayers. Helijet 212 and 205

Empty heading to the truck for another load.

Spooging up. That's what the pilots called the spray.
