Author Topic: For HTC only : P-38 minor fix request  (Read 780 times)

Offline bolillo_loco

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For HTC only : P-38 minor fix request
« Reply #15 on: January 15, 2002, 03:46:45 AM »
on the flaps, really? I thought that combat flaps were 8 degrees, is that half flaps? wow.

on the dive/dive flaps problem tac is talking about. leon badboy smith posted this chart a while back. I think that he said it was estamated, but if you look at the line for speed when buffet was encounterd, it matches the placard limit for the 38 fairly close. how accurate is this graph? thanks.

Quote
Originally posted by Badboy
I found a minute to search through my Lockheed data and turned this up.

     

Chart was signed and dated April 1942. I have one other dated 1940, but it was estimated and quite optimistic.

Leon "Badboy" Smith

Offline Tac

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For HTC only : P-38 minor fix request
« Reply #16 on: January 15, 2002, 11:10:13 AM »
bolillo, the AH 38 is only missing the second effect of the dive flaps. That is, if deployed at high speeds it should pull the nose up by itself, the faster you go the harder it will pull nose up. 2-3 or even 4 g's depending on speed. The first effect , preventing the nose from being tucked under is already taken care of in AH (though weakly, I still dont get it how elevator trim pulls nose up so darn quick when pulling the stick to nose up does zilch.. I thought trim and stick did the same thing... move the elevator!).

That chart is from 1942? Hehe, mustve been an early 38. Cool.

"Actually, you are correct that the P-51B will fire, say, 4 bullets before the P-38L will fire 4 bullets. However, as noted above in combat you never fire only 4 bullets. In other words you are correct in theory, but the timeframe is so tiny it doesn't matter in practice (we're dealing with like 1/6 of a second here).

What is happening, is with every 4 rounds fired per X time, the P-51B takes the lead but the P-38L catches up before the P-51B fires its next 4 rounds. Look at it this way--the P-51B will fire 4 bullets before the P-38 does, but the P-38 will fire its 4 off before the P-51B starts on the next 4. Technically, the P-51B will fire 200 rounds faster than the P-38 will (as you suspect it should)--but the time difference will be something like 1/6 of a second because the P-38 is catching up to the P-51B every 4th round. The P-51B will NOT be able to fire bullet number 201 before the P-38 has fired number 200. In any case, the difference is never greater than 2 bullets and will not make any difference whatsoever in combat."

Maybe im stupid, but what you said makes no sense. 1 plane firing off all 4 bullets first but the other one fires all 4 of his before the 1st one fires the next bout of 4 bullets... both planes are firing the same gun, same ROF.. that would mean that that the 2nd plane, the 38, has faster refire rate to do that?.

That 1/6th of a second is vital for me. For the 51B is lobbing TWO bullets at target and hitting it.. in a snapshot or in a 6 shot that means he can put twice the damage in half the time my 38 can (at convergence of course). And when you hitting a moving target, any concentrated hit damage is dispersed over the enemy plane. Think 51B shooting a zeke thats flying in a tangent and crossing in front of the 51b's nose. Zeke is at 51b convergence.

For discussion sake, make believe the zeke is 200 inches long.

As zeke flies by 51b shoots all guns, firing 2 bullets at a time per gun bank. That means that the first hits on its nose it will take two .50's , next pair of rounds coming in a split second after hit it 2 inches from where the first one hit (zeke is moving fast)... and so on and on. Since 51B is shooting both gun banks with 2 bullets, the zeke will receive 100 impacts of two bullets each (two bullets hitting at same spot doing more damage), thats 200 rounds total (200/2=100, 2rnd per hit =200 bullets) that hit the zeke.

If it was the p-38 that zeke wouldve received only 1 bullet every 2 inches (same guns, same refire rate, but the 38 does not lob 2 bullets at a time). 200/2 = 100 , 1 rnd lobbed at a time =100rnds hitting the target, 1 bullet hole per 2 inches . That all = half the bullets on target and for all that matters, less than 1/4th damage because the 51b's 2 bullets hitting at same time in same spot have increased damage. Both planes firing at "convergence".

and of course, the zeke flies off leaking fuel, oil and burning a mighty fireball... and will still fight for 10 more minutes until its engine dies ;) :D

"I hope I explained this in a way that makes sense. I know what I'm trying to say, but I am having difficulty putting my thoughts into words."

I know the feeling...me too :D :p

Offline Urchin

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For HTC only : P-38 minor fix request
« Reply #17 on: January 15, 2002, 11:27:53 AM »
Well Tac, here is what I got out of it.  
At the instant of firing

P51-Bang, Bang (inboard) - a split second later the other two fire Bang, Bang (outboard)

P38- Bang, Bang, Bang, Bang.  

What he is saying is that although the 2 inboards may fire before your #2 gun fires, your #3 and #4 guns fire BEFORE his two inboards fire again, thus you are putting the same amount of lead on the target.  

So yes, you are lagging a very slight bit behind the P-51B because of the way the guns fire, but it isnt like the P-51B can put out twice as much firepower as you can.  Well, unless you both just tap the fire button to send out 1 (or 2 in the P-51B's case) round at a time.

Offline J_A_B

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For HTC only : P-38 minor fix request
« Reply #18 on: January 15, 2002, 12:01:55 PM »
Thanks Urchin, you do a better job explaining it than I do.


BTW, the time difference for P-38 and P-51B is actually more like 1/12 a second and the difference in number of bullets should never be greater than 1.   This is why it doesn't affect snapshots--you've never shot a plane down with 1 .50 bullet  :)  It's the other 199 you hit it with that's killing the NME.

But yes, unfortunately the Zero will just fly away burning no matter how many times you shoot it.  It must be that ultra-light sponge material they're built out of, it absorbs our bullets and is also fire resistant.  :)

J_A_B

Offline Guppy

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For HTC only : P-38 minor fix request
« Reply #19 on: January 15, 2002, 05:01:35 PM »
Quote
Originally posted by bolillo_loco
on the flaps, really? I thought that combat flaps were 8 degrees, is that half flaps? wow.
I'm not actually sure what the maximum flap extension was. I'd suspect that, given the available settings were 0%, "combat" and 100%, the combat setting just got called 50% for simplicity. :)

Offline BigCrate

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For HTC only : P-38 minor fix request
« Reply #20 on: January 16, 2002, 11:12:39 PM »
I think what tac is trying to say here.. Is give us more control over the planes we fly.... IE flap retraction and dive speed and dive flaps.. Ok no dive speed I'm usingthe same source as badz did in the dive flap discussion.. its my I just printed and sent it to badz 3 years ago :) anyway. ok level speed in a 38 was .6 mach.
and operational dive speed was .68-.71 mach.
and terminal dive speed IE wings rip off and u die in a big fireball :). was .9 mach just bout the speed of sound!
Ok on flaps this is gonna hurt tac's cause.. But it is the truth.
This is out of a flight manual for the P38H P38J-5 and F5b-1
and the date is June 25th 1943

max airspeed (indicated) with full flaps extended is 150mph.

max airspeed (indicated) with 50% flaps extended is 250mph.

Ok that 50% flaps at 250mph restriction but it saids nothing about a notch of flaps deployed above 250mph.. In AW you could deploy 1 notch of flaps above 250knots and up to bout 350knots
(i think it has been a while since I flew AW3)
and on dive flaps yall just ned to look at the site

http://www.p-38online.com/cmprs.html

Hey HTC i'll be dropping in monday or tuesday to give yall some 38 stuff.. I'm not trying to tell yall how to do your jobs just to how to model the 38 :)..



My greatest wish is to fly a P-38L before I die!
CW
=Twin Engined Devils=

Offline Tac

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For HTC only : P-38 minor fix request
« Reply #21 on: January 17, 2002, 10:54:12 AM »
"Ok on flaps this is gonna hurt tac's cause.. But it is the truth"

eh?

The only thing I want is to stop the fowler flaps from RETRACTING by themselves. If they must rip out or make my plane shake harder than fatty's cellullite if I forget to retract them, so be it. But this crap of flaps retracting in the middle of a turnfight and making the plane spin is just intolerable. You can have up to 3 notches of flap deployed from 150mph to 250mph, and in a turnfight, where the 38 is most likely to be doing high and low yo-yo's instead of flat turning, the 250 mph mark is constantly "touched" for a brief time, almost never going above 260 or 270mph before the next manouver bleeds the speed back into the 200 mph range.. but just the "touching" the 250mph tick mark, the flaps pull up by themselves, either spinning your plane or pulling you out of the manouver you're doing because the wing dipped hard (beggining of spin) and you have to stop the manouver to prevent the spin... which effectively gives the guy you're chasing an EXCELLENT chance of getting on your 6 without any effort.

Offline BigCrate

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For HTC only : P-38 minor fix request
« Reply #22 on: January 17, 2002, 12:55:36 PM »
Sry tac taking my head out of my bellybutton now :)
But we do need more control over the aircraft we fly..
If they had auto flap retraction in ww2 alot more pilots would have been killed. Most of the fighter pilots flying is done by riding the ragged edge of his aircraft and if using the the flaps above 250mph to stay alive or to get a kill or diving till just b4 the wing fly off and u become a hugh fireball. WELL SO BE IT HTC!
And thats my 2 cents :)

CW
=Twin Engined Devils=