I have only landed the A-4 on the Forrestal, but it lands fine for me...at least as far as any FSX plane lands fine on the boat.
Some things that may help:
1. Before anything else, you can always cheat a little. The straight in approach requires much less fiddling than the normal day pattern, so you can practice flying the ball a bit before working the pattern.
2. You MUST be trimmed up on speed. Bolters in real life are often as not attributable to not being on speed (calm deck assumed here). The Virtavia A-4 actually holds speed pretty well, so trim it. If every time you look back at the indexer, you are fast or slow you ARE NOT trimmed. That's the hardest thing to learn about the carrier approach and even though FSX is much more forgiving with the effect of eye to hook distance than a real plane I think it is even more prone to bouncing, especially if you make a dive for the deck.
3. If you are flying the pattern, hit those numbers! There is nothing to look at out the window until you are at about the 45, so hawk your gauges. (From memory) 600ft at the 180, 450ft at the 90, 325-375 at the 45. If you fly a good approach turn, on speed, you will wind up rolling out on glideslope with a centered ball and with the proper energy state. It should help your ball flying immensely.
4. Make three part power corrections and scan. If you are low, you must obviously add power to increase your energy state. In most flying regimes, you can crack on a bit of power. Not in a carrier approach. The width of the ball on touchdown is about three feet. It is very sensitive (and increasingly so as you get closer to it). So, if you need to add power:
a. Crack a little power on...
b. Take the exact same amount of power off...
c. Put half the power correction back on.
Remember, you aren't trying to climb here, just get back up on glideslope and resume the same rate of descent, minus a little. If you cob the power on, and leave it there you will get way more of what you wanted, than you wanted. Think of it as adding (or subtracting) a "packet" of power.
What goes along with this is scan. If your left hand is idle on a carrier approach, then you are about to be doing something wrong. Scan meatball, lineup, and AOA, meatball, lineup, and AOA.... If you are high then a little off, a little on, and half back off. Scan. If you are low, a little on, a little off, and half back on. Over and over and over until you hit the deck, go mil and, the boss says:
"Hey, you can go to idle anytime there.....you aren't making the boat go any faster!"
I know what you're thinking: "What if I'm right on speed and on glideslope? Why would I move my left hand then?"
One of the weird things about the ball is that, like any glideslope, the vertical size of the "center" gets smaller as you get closer. So, if you are seeing a centered ball at the start, it will probably not stay there as you continue along, unless you are really, really, (really) lucky. Therefore, you will still probably want to make a small correction to get to the upper side of the centered indication, or what is known as a "cresting ball". This is a ball that is ever so slightly high. With a cresting ball, you know exactly where you are in the center of the ball...at the upper end, and you can work that crest all the way to the deck. This also complies with the old Naval Aviator wisdom that:
"If you can't be good.....be high."
5. Lineup: Remember that the angle of the deck is canted off the centerline of the ship's direction of travel. So, if you flew a perfect straight line starting down the center of the angle, the ship would not be there when you arrived. It would be several yards to your right. Thus the commonly heard:
"Right for lineup."
from the LSO.
Scan lineup every few seconds. Imagine the centerline of the landing area extending right between your legs. As soon as you SENSE (because you won't likely see it if you stare at it) the centerline moving one way or another, put in a quick wingdip as a correction. Don't put a big turn on. Just dip the wing, Level it. and scan again. Also, it will help to roll out at the start with the ship's wake under your left armpit. If you are rolling out in the middle of the wake, you are not on centerline.
As I stated a few pages ago, I personally recommend flying with autorudder on here. It just seems that the Virtavia model is just a tiny bit unresponsive in yaw (personal opinion), without rudder and this is a 1 second wingdip, not a coordinated turn. If you prefer to leave the autorudder off, just put in a quick touch of rudder and take it right back out.
In the end, just like the other facets of the approach, make small discrete corrections, scan to give them time to take effect, and make further corrections from there.
:salute

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