Never ever do that with your planesman. You want every bit of ability from him, so that your air refills the fastest possible.

Taking off rookies is advisable for torpers (front as well, once you hit the torp reload cap at 850k TA), and of course, you should have a ghosted BO (1 rookie only on him, nothing else).

You should burn your experts on engine instead of planesman. Plus side you need to put as much vet on planesman as well but I think 130-150 vets is more than enough. 

Planesman did not have the cap, right? Same as enginner? 

If you reduce the crew on a planesman, you run the risk of starting a game with an empty tank of air.

If you reduce the crew on a torpedo man, you will have more duds.

If you reduce the crew on your BO, then your SD will go down.

If you burn off experts in your engies, then your oh speed and time will go down.  

Yes Planesmen don't have actual caps, but at higher levels they have effective caps because you get tiny reductions in air reload time as your planesman improves.   Again, you have to be a smart player to really need that reload time.  

So my suggestion is to keep everyone fully loaded and live with the loss of a knot.  It really doesn't impact you if you play smart.  Now if you just go running around the board, chasing BBs like they are beautiful blonds, it probably won't do you much good to have one more knot anyway.  Instead, learn to predict where players will be and be waiting for them.   

plansman is only sailor in nf which dont work with less than 90% crew so you can weight off just 10% of recruits
Weight off your BO and torp sailors
BO dont nead recruits at all
Torp sailors you just put on cap , torps very easy reach cap


 

Your planesman is only level 64, it is not helpful by burning expert.

when you get better submarine, you will have extra support slot for engineer which help you move faster.