I was partnered in a T210R for about a year. We bought the airplane new in the Fall of 1985. It was quite a traveling machine, but frankly not a lot of fun to fly. This was back in the day before engine analyzers were common, so running LOP was not common, either.
Here are just some random thoughts, recollections from 30 years ago:
>It was heavy in all respects, especially in pitch with only 2 aboard. With a full load, pitch forces were much less. This brings out an important issue: when you get checked out in it, make sure you fly it fully loaded with aft CG part of the time, because it's an entirely different airplane with aft CG vs. forward CG.
>The flaps on a 210 do not provide nearly the lift of the semi-Fowler flaps of other Cessna singles. You'll notice that there's not as much change in the book stall speeds with flaps extended vs. no flaps, compared to other Cessna singles. Consequently, you can't slow down quite as much on the approach, and it will break ground later on the take off, even with flaps extended 10 or 20 degrees. Using the POH approach speed figures does work quite well, however.
>The built-in oxygen system has many places for leaks to occur, so that needs to be maintained. To save on oxygen, there are now kits which allow the use of Flow-meters and Oxymizer cannulas with the stock oxygen system--highly recommended, instead of oxygen masks, up to 18,000'.
>If you shove the throttle forward too fast, the engine will overspeed a little before the governor catches it. Newbie 210 pilots can be detected by the waaWAAwaa sound when they're first starting to roll. With all that power out front, too fast a throttle will also yaw the airplane to the left enough that the nose tire will wear out much quicker as you apply more needed right rudder. So apply the throttle more slowly, and let the airplane build up some rolling speed before pushing the throttle in all the way. You won't give away your newbie status, you'll save the tire, and the airplane will be easier to control.
>With no gear doors, the gear extension speed (Vlo) and gear down speed (Vle) are the same, and it's pretty high, just below normal cruise. So by reducing throttle just a little and slowing the airplane only about 5-10 knots, you can drop the gear, which acts as a reasonably OK speed brake.
>As with all Cessna single retracts, it's important to understand how the gear extension system works. It's electro-hydraulic, which means that there is a tiny motor which turns a hydraulic pump, which extends and retracts the gear. That brings up several issues:
*If the gear switches aren't working correctly, that little pump can burn out by continuing to run after the gear has reached its full travel.
*If there are any hydraulic leaks, the reservoir will get lower with each cycling, and pretty soon the gear won't go up or down.
*During preflight, it's critical that the landing gear switch is down before turning on the master. But (and this isn't in the POH that I recall) it's also critical that the emergency gear lever is down all the way. It's designed so that the telescoping lever can't be pushed in unless it's down all the way, but there's enough slop in it that it is possible to cram the telescoping lever back without it being down all the way. If that happens, there will be enough bleed through that the electric pump can't develop enough pressure to get the gear down and locked.
*For emergency gear extension, my recollection is that the circuit breaker should be pulled, then put down the switch lever, then extend the telescoping lever of the emergency gear lever, and then pump and pump and pump--it seems to take forever. I've done it during training while shooting an ILS by hand, but if I had a gear problem for real, I'd want to stay out of the pattern, get the gear down, and then come back for the landing.
I think the single hardest thing for most people transitioning from slower Cessna singles is getting used to the speed of a 210. It's a fast airplane, and it will take you awhile to acclimate to that. But there's no reason at all to be concerned, just be prepared. Start letting down sooner, start slowing down sooner, and get it down to the speeds you're used to using, well before you get to your intended landing destination. But don't be surprised if that takes you a good many hours before you're comfortable with it.
Cary
(edit)PS--I just thought of another point. If you're used to the left/both/right fuel valve of a 172 or 182 and you normally leave it on "both", you have to develop a reliable means of remembering to switch tanks, because the T210 has only left or right (and off). For me, that is to switch every half hour. Others use every hour. But especially if you're using the autopilot, you won't notice the wing getting heavy as the other one runs low on fuel. I had a friend who pranged his T210 while doing some lower level "reconnaissance" at about 1000' AGL--he was looking at some rural property to buy--he was slow cruising on autopilot and he ran one tank out. Before he could get it restarted on the other tank, he had no choice but to set it in. Luckily, he found a reasonably flat place to set down and did relatively minimal damage to the airplane.
C