What number of Green LDB's gaurantees a 90% chance or better of defeating an Daytime AIR 40 drop? No fortifications or other factors are present.

Depends. I'll answer you when you clarrify things a little, please.

First; are you talking about the individual Air Regiments or the Russian Air 40 division?
Second; LDB's are always considered as 'green' for morale, and any combat modifications.
Third; no factors are present at all? No terrain, no leaders, no TPL, etc?

And I don't feel like a poll is necessary for this. I can give you an exact answer, instead, if you prefer.

I had intended the question to be for a generic Air Reiment of which an AIR 40 might be among them.

NO terrain except city. I would consider this question to for a city drop. No other terrain.

TPL is an intersesting question. I would think its just part of the "grey areas" one has to think about when picking how many LDB's to put in a city.

Air Regiments, pending on nationality, range at 70, 73, and 75 OFR, before any modifications.
You specified for; 'line' experience, day drop, and city terrain. So I didn't count anything else.
The hard part, was figuring out the so called "90% chance of success". The combat tables beyonde the first decimal place are not in the rules set. I'm not a statistician either, and it's been a long time since I was in school.
Normally, I like sure things, but to each his own. Sometimes one can't do all he wants to do, within a set of orders (which happens to me, nearly all the time, any ways).

So, I'd say, that if you were facing:

- Russian; build at least 7, significant chance you'll need 8, LDB's.
- British; build 8 LDB's.
- American / German; build at least 8, slight chance you'll need 9, LDB's.


When I expanded this from the; 'green' Russian AIR 40R, against City TPL of 5 with a field marshal in the city - to - the 'elite' German AIR 40, with 5 AA and City TPL, accompinied by a field marshal against just plain LDB's; I found out a few things.

Interesting...