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I could be wrong but I think the F4F was the last Navy plane to be tested with a terminal velocity dive.Every aircraft will have a DO NOT EXCEED speed, to include an F4F. It is shown in flight manuals as VNE and is usually indicted as a red line on airspeed indicators. It is the speed at which structural damage to the airframe can occur if abrupt maneuvers are attempted or if flown in turbulent air. Even though we know the F4F was built like a tank, given the right circumstances, you can bend or break the airframe.
Back in WW2 some parameters like VNE were sometimes not indicted in the flight manual or marked on the airspeed indicator
I believe you're correct although I remember reading that Bob Hall, Grumman's Chief Test Pilot did do some terminal velocity dive tests. I don't know if that was before or after he became Chief Test Pilot.I could be wrong but I think the F4F was the last Navy plane to be tested with a terminal velocity dive.
Test pilot took the plane up to a certain altitude and then dove down vertical or near vertical until the plane simply didn't go any faster (drag equaled thrust/gravity) and the pilot pulled out. Quite often a special test pilot was hired to do this test instead of the regular company test pilot/s. The Navy also required every design to perform a 10 turn spin to the right and a ten turn spin to the left.
The Corsair was supposed to be the first plane that didn't have to pass these tests although they tried more than once.
With planes that had the speed of the Corsair there simply wasn't enough altitude to perform these tests like they did with the biplanes and first generation monoplanes. The tests, like the spin tests, took a lot more altitude per turn of spin. The dive test was running into compressibility.
The F4F-4 had a top speed more like 318 mph and that may have been optimistic. The climb rate was a joke, a bad joke, a bad off color joke with a horrible punch line.Ah, nothing like a spirited discussion. Yes, time frame and "which version of the plane?" does matter, and answering that in detail would require pretty much a battle-by-battle accounting. My list is only a gross generalization, quickly compiled, primarily intended to answer the charge that anybody thinks that maneuverability was the Zero's only advantage. It wasn't. But on balance, the Wildcat had some crucial advantages itself. Having a working radio was actually a pretty big deal that a lot of people (most?) are unaware of.
If I recall, the F4F-4 was the version that first incorporated armor, but the dash 3 planes were retrofitted as quickly as they could get 'er done, and that process began in September 1941. I don't know how quickly they completed the job.
As for the charge that the results of training and tactics should not be credited to the airframe, there is some justice to that, but the tactics would not have worked with a plane that simply did not have any redeeming qualities. For example, I doubt that even Jimmy Thach could have figured out a way to beat Zeroes with Buffaloes. (I could be wrong, but that's my guess.)
As for the Zero's roll rate, some people seem to think that things just HAPPEN beyond a certain threshold or amount of time. Like that a Zero simply couldn't roll if was going 1mph above some magic number. My source said that roll rate began to fall off above 180 knots, which is actually 207mph, but that is only a gross generality. It may be more fair to say that at 300mph (which would be easily achieved during a diving attack) the Zero's ailerons were very, very difficult to move. The Wildcat's apparently were not (or at least not to anything like the same degree). So, at high speeds that's a Wildcat advantage. (Both planes had a top speed in level flight of about 330mph.)
They did a terminal dive test on the XF5F skyrocket. I think it was a 505 mph straight down power dive. I can give the date after I get home. They did it a couple of times a day or so apart. Don't know if they did it on the Wildcat or notI could be wrong but I think the F4F was the last Navy plane to be tested with a terminal velocity dive.
Test pilot took the plane up to a certain altitude and then dove down vertical or near vertical until the plane simply didn't go any faster (drag equaled thrust/gravity) and the pilot pulled out. Quite often a special test pilot was hired to do this test instead of the regular company test pilot/s. The Navy also required every design to perform a 10 turn spin to the right and a ten turn spin to the left.
The Corsair was supposed to be the first plane that didn't have to pass these tests although they tried more than once.
With planes that had the speed of the Corsair there simply wasn't enough altitude to perform these tests like they did with the biplanes and first generation monoplanes. The tests, like the spin tests, took a lot more altitude per turn of spin. The dive test was running into compressibility.
True, but don't forget that 300+ mph could also be attained in a dive, which was why a (relatively) safe attack tactic would be to bounce a flight of Zeroes from above (coastwatchers or radar could provide enough advance warning for the Wildcats to launch and get up high enough). The Zeroes then could not follow the Wildcats to counterattack, or if they tried, they couldn't follow the Cats in turns. But mostly they just couldn't follow because the Cats could dive faster in any case.The F4F-4 had a top speed more like 318 mph and that may have been optimistic. The climb rate was a joke, a bad joke, a bad off color joke with a horrible punch line.
Your 100% correct that the Zeros roll rate slowly got worse, but you need to be able to get over 300 mph for this to help you. With the, at best, top speed of an F4F-4 at around 318 mph you simply didn't have the power to stay above a speed where you could out turn the Zero.
Actually the Wildcat wasn't faster in a dive. I think I can find the test, but they were about equal in top speed in a dive. I was shocked as I always thought the Wildcat was faster going down hill. I'll look for the test when I get home.True, but don't forget that 300+ mph could also be attained in a dive, which was why a (relatively) safe attack tactic would be to bounce a flight of Zeroes from above (coastwatchers or radar could provide enough advance warning for the Wildcats to launch and get up high enough). The Zeroes then could not follow the Wildcats to counterattack, or if they tried, they couldn't follow the Cats in turns. But mostly they just couldn't follow because the Cats could dive faster in any case.
A few things - understand that the Zero's controls got PROGRESSIVELY stiff, there wasn't a magic number when suddenly the aircraft couldn't maneuver, and this was probably true about any pitch movements. So take that into consideration with what the physical ability of your average IJN Zero pilot was capable of. Even with your so called loop maneuver, if any Zero pilot was doing this on his own or fighting without team coordination, in the end he was not going to win.The F4F-4 had a top speed more like 318 mph and that may have been optimistic. The climb rate was a joke, a bad joke, a bad off color joke with a horrible punch line.
Your 100% correct that the Zeros roll rate slowly got worse, but you need to be able to get over 300 mph for this to help you. With the, at best, top speed of an F4F-4 at around 318 mph you simply didn't have the power to stay above a speed where you could out turn the Zero. Now a P38 was a different story, with a top speed of 390-414 mph or so it could absolutely stay above 300 mph all day long.
But even if a Zero is going fast enough he can't roll, he can still loop and I have read that this was actually their favorite way to get on another fighters tail. They simply loop up and over and drop down on the heavier fighter that can't follow the loop
Reference? I believe the Zero had a top diving speed of 410mph. Any abrupt maneuvers in the dive would more than likely cause structural damage.Actually the Wildcat wasn't faster in a dive. I think I can find the test, but they were about equal in top speed in a dive. I was shocked as I always thought the Wildcat was faster going down hill. I'll look for the test when I get home.
But if they were diving the Wildcat could get up to where it could out turn the Zero, until of course you ran out of altitude
My list is only a gross generalization, quickly compiled, primarily intended to answer the charge that anybody thinks that maneuverability was the Zero's only advantage. It wasn't. But on balance, the Wildcat had some crucial advantages itself.
Reference? I believe the Zero had a top diving speed of 410mph. Any abrupt maneuvers in the dive would more than likely cause structural damage.
Fair enough, but as stated, even at it's top diving speed, I doubt the Zero was going to do any abrupt maneuvers without risking structural damage, I'd bet dollars to donuts the F4F didn't have that issueIt isn't exactly what I remembered, wrong models, it is the Zeke 52 vs FM2 Wildcat, not an early Zero vs an F4F-4 so regard the info as you see fit.
Or perhaps the groundzero? The one with self combusting nut sacks?And this sums up your entire approach, picking and choosing evidence and misusing evidence to support your own hypothesis. I see an inverse P-39 Groundhog emerging where one or two people are making claims based on bias and picking and choosing info in support and the rest expending posts in disproving those claims. Mitsubishi A6M Groundhoggo.
Ah, no. Really.And this sums up your entire approach, picking and choosing evidence and misusing evidence to support your own hypothesis. I see an inverse P-39 Groundhog emerging where one or two people are making claims based on bias and picking and choosing info in support.
Oh I agree. I have stated in other threads that I know what the Wildcat did, but it defies explanation of how it did it. One of the aces at Guadalcanal stated that they should have been easily wiped out and he didn't understand why they didn't. I think I read that in the 2nd book of the First Team. The only thing that I can come up with that tipped the balance in favor of the Wildcat was the 50 was a great balance of hitting power, rounds per gun per minute, amount of ammo carried and the thorough teaching of deflection shooting in the US Navy.A few things - understand that the Zero's controls got PROGRESSIVELY stiff, there wasn't a magic number when suddenly the aircraft couldn't maneuver, and this was probably true about any pitch movements. So take that into consideration with what the physical ability of your average IJN Zero pilot was capable of. Even with your so called loop maneuver, if any Zero pilot was doing this on his own or fighting without team coordination, in the end he was not going to win.
Despite anything you can say about the F4F, the Zero "should have" blown it out of the sky, but as it's been beat to death so many times, tactics and the ruggedness of the aircraft made it capable of taking on the Zero and this is evident in the end results.
Now did it have a 6:1 kill ratio over the Zero during the Guadalcanal campaign? I don't believe so. Over the Zero I believe the average would be like 2:1 or 3:1 depending where and when you're talking about. Because the Zero did not overwhelm it's opponents over places like Guadalcanal and Darwin, it failed it's mission. The Zero (IJN, or for that matter the JAAF) needed at least (IMO) a 4:1 or 5:1 kill ratio to maintain aerial superiority.
My info on diving turned out to be Zero 52 vs FM2, instead of Zero 21 or 32 vs F4F-4 so feel free to process that info how you like. I will not disagree with your claim because my info was of different models of those airplanes than we were discussingAh, no. Really.
I may be guilty of quick and sloppy at times (my mom complained that that was how I built my model airplanes), but I never knowingly cherry-pick the data. I just take what I find, judge how likely it is to be reliable, and then lay it out.
A few posts upstream somebody says I am wrong about the Cat diving faster than a Zero. OK, if he's right, that's new information and I will incorporate in in future comments if necessary. But I'm not the sort of guy to cry "Fake News!" if I don't want something to be true. If I'm shown to be wrong, then I'm wrong, and I'll admit it.
If I'm shown to be wrong, then I'm wrong, and I'll admit it.
And teamworkOh I agree. I have stated in other threads that I know what the Wildcat did, but it defies explanation of how it did it. One of the aces at Guadalcanal stated that they should have been easily wiped out and he didn't understand why they didn't. I think I read that in the 2nd book of the First Team. The only thing that I can come up with that tipped the balance in favor of the Wildcat was the 50 was a great balance of hitting power, rounds per gun per minute, amount of ammo carried and the thorough teaching of deflection shooting in the US Navy.
And teamwork