As most of you know, I'm a Hog-O-phile as well, and fly it all the time.
I use 500 MPH dives on a regular basis with no problems. BUT, I have had a few weird experiences where I lost a wingtip at 300-400 IAS without pulling much G.. not even into tunnel vision. It seems to be sort of rare. Most times I can do stuff like pull a near-totally blacked out loop from 450 MPH with no problem. (And boy does that low 109 driver ever freak when you loop back onto his six THAT fast. <G> )
Regarding the rudder. Hog rudder is good to slow the craft, but starts to lose effectiveness over 300MPH. It works at 400.. it just doesn't do much. However, if you start a dive slow and cross control it all the way down, it keeps your speed nice and low.
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Lephturn - Chief Trainer
A member of The Flying Pigs
Visit Lephturn's Aerodrome for AH news, resources, and training data.
http://users.andara.com/~sconrad/"MY P-47 is a pretty good ship
And she took a round coming 'cross the Channel last trip
I was thinking 'bout my baby and lettin' her rip
Always got me through so far
Well they can ship me all over this great big world
But I'll never find nothing like my North End girl
I'm taking her home with me one day, sir
Soon as we win this war"
- Steve Earl