For San Diego 89. Here’s the thread on the Boxcar and the jet use that you mentioned.
viewtopic.php?f=3&t=72255&start=0I suppose a take-off from a long runway might be done without starting the jet to save fuel, but the single engine performance, even empty with the Box was so marginal that I doubt that anyone did it very often. Most tanker contracts paid for the fuel as did the Fish Haul people, so there was no need to worry about that unless you were really low on fuel and couldn’t refuel until the next stop.
The H&P Boxcars that I flew in had to run both recips at a considerable amount of power while starting the jet. P2V tankers with the same J34s usually had an extra generator on the engines to help with starting them. I don’t remember if we ran the APU during jet starts or not, but I’m pretty sure that we did. On the Fish Haul with a load the jet was run until reaching cruise altitude and it felt like someone had dropped the landing gear when the jet was throttled back and shut down.
The jet would be run to full thrust before brake release, but at low airspeeds the jet doesn’t put out much thrust, so even with both recips at max power and maybe with water injection take-offs from a short runway on a hot day with no wind could be exciting. With tankers you could jettison the load. With the Fish Haul we used 115/145 avgas and water injection on the recips and the jet was a must until you had some altitude to play with.