See I dislike stop and goes myself. I think the one thing that keeps a T&G reasonable is that you aren't spending runway coming to a full stop then accelerating back to flying speed. I guess if you have like 10,000' to work with... sure? And it really doesn't teach you much either. Essentially you are doing a normal landing with a normal intersection departure. All you save is a few moments of taxi back.
A T&G teaches you to control the airplane well through the reconfiguration and transition back to take off. Its a procedure you might have to do in an emergency some day and for that it has airmanship value. All IMO.
-G
A couple thoughts on this.
First, I was doing stop and go landings the other day on a 2700 ft grass strip. I was rolling out in about 500 ft with full stall landings and in about 700 ft with wheel landings. I easily had 2000-2200' of runway left for the subsequent take off. Neither end of the runway was obstructed.
At the home field it's a bit different. The length is only 1800 ft, and there are 80' tall trees near the approach end of 7 and houses on the approach end of 25. Touch and goes are not a great idea and stop and goes are a bad idea even in a Citabria. I've never seen the guy with the 180 Comanche based there do a touch and go either for obvious reasons.
In short, stop and goes don't need 10,000 ft of runway for most GA aircraft, but you do have to consider the aircraft, the wind, and the runway environment.
Second, one of the drills that we did during commercial training was to land a PA-28 full flap, touching only on the mains, then bring the flaps up and take off again, all without letting the nose wheel touch and while staying on the centerline. It requires the commercial candidate to 1) precisely control the aircraft, 2) understand what's happening and anticipate changes, and 3) perform while his/her attention is divided. It's a great drill in that context, But I would not suggest a student or a low time private pilot do it.
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I am also not a big fan of touch and goes in a tailwheel aircraft, especially for inexperienced pilots with limited tail wheel time. It requires all the bandwidth they have and eyes firmly out of the cockpit to ensure the aircraft rolls out straight and on centerline. Cleaning up the trim and flap then has to be done by feel, and with some division of attention that may well exceed their available bandwidth.
A stop and go is much safer as the aircraft can be reconfigured for take-off with the aircraft stopped.