Author Topic: Diving acceleration (Read 234 times)

BigCrate · « **on:** April 04, 2002, 11:22:54 AM »

Been flying the P-51D and F4U-1C here lately. And one thing I have noticed is if you dive one of these two planes with the throttle closed (as I am used to doing flying the 38) the acceleration isn't much better than level acceleration from 150mph. But if I keep the throttle open and I enter the dive the acceleration is like that of the 38 with throttles closed.
But if I enter a dive in a 38 with throttles open that thing picks
up speed like a falling brick!! But if the throttles are closed when I enter the dive in a 38 theres not a real big difference from op throttles than closed throttles.

My ?s

Is why does the 51 and f4 have such a big differnece in acceleration in a dive with throttles open and with throttles closed??

And why does the 38 pick up speed like a faling brick??

I know wieght has something to with it. And the P-38 comin in at 17,500lbs. Thats a heavy fighter.. But still I can't swallow that the 38's acceleration is like it is with the throtles closed and with the throttles open.

All dives in all three planes were between 40-60 dergees. Some dives were from 20k and the from 20k in a 38 were between 15-25 degrees. And dives in a 51 were at dive angles same as above.

Cw
=Twin Engined Devils=

Tac · « **Reply #1 on:** April 04, 2002, 01:26:10 PM »

ermm.. say what?

Diving with 0 manifold pressure does not accel the plane as fast as it would with full manifold. However, diving with engines OFF will accell faster in dive than with manifold 0 (props drag you I think). Regardless, the 38 is the best accel US fighter. It will INITIALLY outdive the P-47 and the P-51. Plus its so pretty nature just HAS to give way.

BigCrate · « **Reply #2 on:** April 04, 2002, 02:34:05 PM »

Heeheheheheeh Tac. What I don't understand is if i dive the 38 from above 20k with throttles chopped and a dive angle of only about 25 degrees I start buffeting and then compress shortly there after. Since the dive flaps do nothing I have to resort to use tactics like what the early model 38 drivers had to do. Even then theres not a big gap between when buffeting starts and when fully compressed. I guess what I'm saying or asking.
Is there a way keep a high speed in a 38 and not compress??
Its really a pain in the bellybutton diving on the a nme and compressing 1500 yards away. He break turns and I overshoot
badly. And you can only chase that demon so far in a 38.

Cw
=Twin Engined Devils=

Tac · « **Reply #3 on:** April 04, 2002, 02:41:40 PM »

yes. Roll with a little pull (half a gee). you can maintain 500mph (well, 490) on a dive that way with full control. Problem is, the moment you stop pulling that half a gee you will buffet and compress. Personally, if something is that low or diving so fast i'll compress I just pull up and let him go. Chances are the other guy is compressed too, or, if a pony or 190 or la7, it will run away regardless.

BigCrate · « **Reply #4 on:** April 05, 2002, 01:31:51 AM »

Tac I do a roll move with chopped throttles before i enter the dive. My speed is about 200 or 215mph. Then i just level my wings
and and dive like a bat outta hell

. I can can get a good 9k outta a dive doing that. and be about ohhhh 440mph. But thats from only about 13 or 14k. Now from say 20 or 22k I can only dive about 4 or 5k and compression sets in. Funny I thought pulling Gs. while in a dive with a 38 only made that buffeting worse. Or was it only if ya compressed and buffeting bad.

Tac so you sparil all the way down in a dive?? Man I need to wing up with one yall next time I'm up and watch what the hell yall do.

Cw
=Twin Engined Devils=