Still working on it. The data supported the position that the throttle position never changed, the RPM's dropped, and the fuel pump voltage increased. Thus causing the tailpipe fires.

However, there appears a chance that I caused the problems over time feeding too much propane into my engines over time. Something I had no idea could cause a problem.

When all of the data comes back, and the engines have been inspected and wheels placed in a micrometer and checked out, I will start a new thread in the jets section describing what happened, and how others can gain from my experiences.

For years I have been stupidly telling other modelers to follow my lead on propane starts. So far my advice has been sounds except for one detail. The object of a good safe start is to use as little propane as possible to get the engine going.

Again, this will all be explained in great detail in about two to three weeks in the jets section.

I sent all four of my engines down to Mexico to be reviewed, and have had multiple conversations with Felipe about them.

We have both agreed that whatever the causes we will get down to it and come up with a plan for this not to happen again.

Also, keep in mind that the weather conditions at Waco were extrememly HOT. When Artes sets an engine ramp up speed, they do so at 6000 MSL and try to set for the whole world. I'm certain that on that particular day, my engine ramp up speed was too agressive for that day. That also played a lot into the issues I had.

So stand by, I'll share it all once I know for sure.

Sean