Remember the GUNNERS skill is ONLY if you have other gunners on the airframe.
So something like the P-38G has pilot only - no extra gunners, so putting anything there is a waste.
A B-17 has 6 extra gunners... the points to change a single gunner to expert is a lot, something like 220 for the first, 330 for #2, 440 for #3 etc, so to get a full compliment of experienced gunners is a lot of points when you have a lot of guns.
A plane like a Jap KI-45 has one extra gunner so the training is not too bad there.
You can see how many gunners you have by opening the crew training window and look in the footer of the window and it will say how many gunners you have - if it is the P-38G you will see Additional Gunners - 0
B-17 would show Additional gunners - 6
If you have a plane with a gunner and you train them to something - then you move the crew to a different plane with no extra gunners, points spent are locked.
So I try to (but not totally successful) keep my planes with more than one crew training in planes with more than one crew.
Unfortunately like the British Wellingtons, great planes in tier 1 and 2 but there slow assed - wooden bombers, and once you get to the third Wellie, your truly hosed, and I spent crew slots on them, I've moved one crew to a Beaufighter and I guess I'll do the same when I get the other and/or the Mosquitoes.
But yes, ground crew does have a HUGE impact.
c. Ground services (11068 to max)[02.03.00]
- Repair speed (2138 to max) The mechanic's skill. The rate at which the aircraft is repaired in the hang and at the airfield.
note: This skill can save a lot of money on repair fee on planes that have short repair time and high cost but to make this skill useful, make sure to disable autorepair (on the lower left of the main hangar screen) or it will repair your plane as soon as the battle end without taking advantage of the skill.
50 levels in repair speed skill with halve the time required to repair a plane, further qualification training will reduce it even more.
- Repair rank (2189 to max) The mechanic's skill. The maximum rank of aircraft that the mechanic can repair.
Note: The plane will repair anyway in the hangar or at an airfield if your repair rank isn't as high as your plane but the repair speed skill won't make the repair any faster until your repair rank is at least as high as your plane's rank.
- Reload speed (5441 to max) The armorer's skill, the speed at which the weapons are reloaded in the air and at the airfield.
Note: This is one of the most important skill in arcade mode. This works on bombs as well as guns.
I'll list the reload time of the German bomber he-111 h-6 (same reload time as the h-16 version)as an example.
With 0 level in reload speed skill the bombs reload time is 1:19 seconds
With 5 levels in reload speed skill the bombs reload time is 1:16 seconds
With 50 levels in reload speed skill the bombs reload time is 53 seconds
With 50 levels and expert qualification in reload speed skill the bombs reload time is 44 seconds.
With 50 levels and ace qualification in reload speed skill the bombs reload time is 39 seconds.
- Healing speed (1300 to max) The medic's skill, the speed at which pilots and gunners who are wounded are healed.
Note: I'm not sure what the difference is between this skill and the vitality skills from the other tabs.
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