I would guess it would be mixed with the fuel, wouldn’t it? Maybe sprayed at different times, but sprayed with both?
Another possibility: I don’t know enough to know if it makes a difference, but the engine block did bounce away from the crowd on impact. Maybe a lot of coolant was contained in the block and sprayed in a different direction?
Nope, not in this case. Galloping Ghost used a boil-off system. Coolant in the wing tank was sacrificed by boiling it off to cool the engine. (Note no air scoop for the cooler).
Yes, I suspect the coolant and fuel mixed and probably prevented a fire. On Friday night I saw three cylinders of the engine sitting about 130 feet from the main impact area on the side opposite the grandstand. Some very lucky people there.
This aircraft did not have a traditional P-51 radiator, rather a closed loop cooling system with a Methanol/Water ( I hope I have those two liquids right) boiler ( if you will ) that got rid of the heat via these two boiling off.
If you look at the photo's of the aircraft, their are ports just aft of the wings trailing edge(s) where these boiled off fluids would exit, as puffs of steam
The question I have is did these liquids help supress a potential greater fire.