Based aircraft limit values over time

[aschack]

Up until a point the based aircraft limit value increases by 5 per year and will eventually hit 600 in 2015 and now 1000 in 2035.
In 1974 the limit's 250, and it's easy to see that it won't hit 600 in 2015 by increasing 5 per year. A bit of napkin math says that if it increases at 5 per year until 1986 and from then on by 10 per year, it'll hit 600 in 2015. Can anyone confirm if this is correct? Or does it increase by 5 for longer and then increase by say 15 later on?

[Mort]

In the 80's challenge, it increased by 10 in both 1986 (315 -> 325) and 1987 (325 -> 335).

Unfortunately, I wasn't paying close attention before as the limit was less relevant.

[dmoose42]

At some point I believe it switches to 10 a year. I forget the exact year.

[schro]

The data points for 4 different years are published somewhere (check the changelog for them - I'm too lazy to do it).

The formula moves them on an annual basis on a straight line between each point, rounding to the nearest 5. 2015 to 2035 (I remember this one) is 600 -> 1000, or 20/year.

[Mort]

1955-1975: 5/year
1975-1995: 10/year
1995-2015: 15/year
2015-2035: 20/year

That would make sense I guess, but not sure how accurate it is?

[Tha_Ape]

1955-1975: 5/year
1975-1995: 10/year
1995-2015: 15/year
2015-2035: 20/year

That would make sense I guess, but not sure how accurate it is?

Between 50 and 75 some years are +10 (to get the exact number at the end of the period). The exact number is probably around 5.5 or 6, but as Sami and others said, rounded to the nearest multiple of 5.

[aschack]

The data points for 4 different years are published somewhere (check the changelog for them - I'm too lazy to do it).

The formula moves them on an annual basis on a straight line between each point, rounding to the nearest 5. 2015 to 2035 (I remember this one) is 600 -> 1000, or 20/year.

Good idea. I found it in some old changelogs, and I'm more or less right. It's increasing by 5 per year until 1985/86, then by 10 each year until 2015 when it goes to 20 per year. And starting at 100.

[aschack]

Colour me confused. It just increased by 10 going from 1974 to 1975. I officially have no idea how it works now, but if it switches back to 5/year, I'll be looking mighty silly after investing based on 10/year.

[schro]

Colour me confused. It just increased by 10 going from 1974 to 1975. I officially have no idea how it works now, but if it switches back to 5/year, I'll be looking mighty silly after investing based on 10/year.

According to that linked change log, 250 planes are added over the course of the 40 years between 1950 and 1990. Therefore, that's 6.25 per year, rounded to the nearest 5. With that math, you get 5 each year but every 4th year you get 10.

[aschack]

According to that linked change log, 250 planes are added over the course of the 40 years between 1950 and 1990. Therefore, that's 6.25 per year, rounded to the nearest 5. With that math, you get 5 each year but every 4th year you get 10.

That's a good point. I may well have been too optimistic. Time will tell...