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[motorjet]

I have found in trying to operate from large carriers with either the Douglas XTB2D or the Yokosuka D4Y that the take-off ends up in the drink consistently. The Skypirate will drop into the drink even without a load of ordnance while I can get the D4Y to launch without any bombs. I tried this on Essex, Graf Zeppelin, and the Taiho with and without catapult assistance. I am assuming that since these planes are equipped with tailhooks that they are supposed to launch at least from large carriers with a load of ordnance. Is there an adjustment that could be made to the flight models to these and any other plane that might have this issue?
Thank you, I really enjoy playing with the work you guys do on this game!

[Baumann89]

I have launched the XTB2D very often with 4 torpedos without problems.
I have used the Essex class and catapult and the plane took off quiet well.

[gunny0134]

Catapult...

But unfortunately...

  ''Taihō's original design specified installation of two catapults on her forward bow for power-assisted take-offs. However, as the Imperial Japanese Navy had not developed a workable catapult for carrier decks by the time of Taihō's construction, these were eventually deleted from the requirements. The IJN instead opted to use rocket-assisted take-off gear (RATOG) when necessary. This consisted of two solid-propellant (cordite) rockets attached to either side of a plane's fuselage. Generating 700 kgf (1,500 lbf) of thrust for three seconds, they were able to get an aircraft airborne in a much shorter distance than normally required.'' (from Wikipedia)

Therefore, it would be desirable for the D4Y family to operate only on the ground.

However, it is worth paying attention to 'Rocket-assisted take-off gear (RATOG)' here.

In fact, D4Y2(s) of ten010 requires a very long runway, even on the ground...

If RATOG can be attached to D4Y2(s) of ten010, it is considered that it can be operated more appropriately on the ground and can be operated on the carrier.

Thank you.

RATOG's Attachment Case : Me-321


PS 1) TB2D-1 taking off with catapult from carrier without problems.


PS 2) D4Y2 barely taking off after passing a lot of the runway.

[Vampire_pilot]

This is nothing for a hotfix, as this is no bug. If this is a feature request for RATO on the D4Y, it should be in the request section for a modder to take it up.

The early D4Y was known to be difficult to operate and needed at least a large fleet carrier (which weren't around much later in the war after Midway). It was not suited for smaller carriers. In any case, you have to trade weight. 100% fuel + heaviest loadout will not work without catapult.

I was curious though, here I am taking her off Akagi with 50% fuel and a 500kg bomb with take-off flaps setting (torque, flutter and stall set to ON). Going some 150km/h at the end of the deck. Maybe that could be squeezed with full flaps setting. So it is possible. The 250kg bomb may not be not as impressive but more suited for carrier ops with this plane.

Of course the carrier is doing its job too: Going full speed, headed into (mediocre) wind at 2m/sec. You could squeeze these values a bit more I suppose with stronger winds.





edit: seems like 4220 something kg and full flaps is the useful player limit. I could scratch her away with 4350kg (500kg bomb + 60% fuel) but that is a close call with the waves.

~4100kg (250kg+2x60kg, 50% fuel) is just about the end of comfortable. I managed to pull out easily and all AI of my flight also made it.

4250kg (60% fuel) was possible for AI but not really comfortable. Which, according to wikipedia, is apparently the max. design takeoff weight. So you can easily overload this plane.

[Vampire_pilot]

I think I found the actual "issue" with this plane.
The fuel load is absolutely exaggerated in terms of weight. The value in the FM is set to 1540kg of fuel  Actually, the figure I could find in a quick and dirty search was an internal fuel capacity of 1070 liters, which is roughly-puffly 800kilos and would actually be ~ 50% fuel load. So my above settings with 50% fuel weight seem about correct, as you can meet the given maximum take-off weight with a heavy loadout.
No idea how this high number came along. It would not even be that much with the two 300l additional tanks...

Honestly, if you can't take off a plane decently, check your weights (tab key). It is very often the key to the issue.

[motorjet]

After reading all of the responses, I went into my sample carrier mission and adjusted the speed of the carrier to 80kph and reduced the fuel to between 50-70% on both planes with various loadouts. I have successfully operated both planes from large flattops. I also tried flying the D4Y in a pilot career mission and that worked simply by reducing fuel which is good being that the carrier speed is what mission generator sets for it.
Thanks for the help, guys. 

[Vampire_pilot]

Good! 80kmh might be a bit too fast, mine was doing 55, the Akagi could do even slightly more, just below 60.

But after reading up on the D4Y, the thing is, the -2 indeed held 1540 liters (not kg) of fuel. But the point still holds. You have to trade your weight: bomb load or fuel. You rarely need fuel for 7 or 8 hours of flight.

[gunny0134]

I think it would be better to fix the FM for all users.