Welcome Driftless. The Cessna 140 is an excellent airplane to learn in and continue flying in many situations. It is faster than similar powered Cubs, Champs, etc. and the gear is a bit wider but also springier. Both pilots can see better than in tandems, where the instructor has to pretty much rely on what you see out front. Don't get your heart set on one airplane, however, until the pre-buy and actually visiting the owner gives you a much better picture of what is good, bad, and ugly. MTV is up your way and would be able to give more specific advice on airplane model particulars.
I was lucky enough to be the first Army ROTC cadet to use the ROTC Flight Program to get a Commercial rather than Private license. I wasn't approved until 01 Jun of my senior year. I flew 36 hours at Downtown Airport in Springfield. Missouri that June all in the Cessna 140A graduating and being commissioned 24 Jun after the commercial check ride in the 140. I had soloed in a 90 hp SuperCub at Jeffco in 63 and liked that airplane better for flying solo, but preferred to instruct in side by side. I also taught crop dusting from the back seat of SuperCubs and the lack of good visibility in the direction of flight was exciting but less comfortable.
There are two way to keep all airplanes going straight, both on short final and on the surface. The first is to let gust spread on short final or the natural tendency with cg behind the gear of the airplane to want to switch ends on the ground and then correct with rudder yaw. With that technique the instructor will be a little tighter on the controls with you and that means you will not likely learn as quickly. We learn best by doing. The second technique is dynamic proactive rudder movement continuously on taxi, takeoff, short final, landing, roll out, and taxi back to tiedown. If you have read my posts, this is what I call tail wagging which gives much better preventive control than wing wagging. Ailerons are a serious distraction to learning to control the beast part of the beast. Yes, MTV, we need aileron into the wind and more of it as we slow down. That is seperate from rudder work and that is where confusion begins. There are many places, like short final, where coordination of aileron and rudder are just wing wagging. Anyway, while dynamic proactive prevents the instructor from riding the rudder so closely and allows you to learn much faster, he is a little further behind on taking over completely to save the airplane from a bad miscalculation on your part. The beauty of dynamic proactive (walking the rudder pedals) is that it prevents and both gross movement (best when slow) and fine movement (best when fast) always work so long as we are dynamic with either the gross or fine. What I am saying is that you don't have to worry about how much as you do with the reactive technique. Thus the airplane will give you time to learn. The other way it is totally up to the individual instructor when you will actually learn. From that point, regardless of technique, you are on your own.
It is not that hard. You can practice dynamic proactive by balancing a broom with the end of the handle on your palm. Don't practice dynamic proactive in your automobile. Unfortunately we all have too much muscle memory to turn with the yoke. That only works well in the Ercoupe.
Have fun.
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