ORIGINAL: proptop
I just had a thought about timing/pipe "holding back" the r.p.m.
Just wondering...
If an angine looses it's prop, and you have a shaft run, can't the engine's r.p.m. go waaaayyyy beyond it's "normal" range?
I'm thinking if you put a fairly clean airplane like the Patriot into a WFO screaming full throttle dive, the engine isn't really gonna hold things back much
and the r.p.m. could go well beyond what could be considered the "normal" operating range. (no matter what the timing #'s are or the pipe "says"
)
I'm not talking astronomical r.p.m. figures now...but maybe 20K or thereabouts?
Whadoyathink?
you bring up an interesting point. What is the difference in a shaft run rpm and the rpm of an airplane capable of a high terminal velocity pointed straight down? I have seen evidence that there is a difference but can not explain why a zero load opens up another can of worms. Maybe one of the engine gurus can help us out. As Combatpigg stated earlier, enough weight in a dive will push an engine past it's normal timing limits.