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Having gone through an avionics upgrade and a major annual where most of the deferred maintenance items were taken care of, and more recently an engine overhaul, I'm now faced with the terrifying thought of an airframe with very few things wrong with it. That means I might have to fly it instead of taking it apart. Ack!
This is the airframe stuff that should get done pretty soon:
This stuff can wait, they are nice-to-have features:
And of course there's also the inevitable "speed mods" that could be performed.
The main landing gear, although retractable, still sticks far out into the slipstream when retracted. Some folks have used Cessna 150 fiberglass wheel pants, sawed them in half and added a screw flange for attachment below the wing. This will fair in the wheel area when retracted. Here's an example:
A more elaborate fairing system is installed on Drew Peterson's highly customized 230. This version utilizes fairings attached to the gear leg itself, as well as a fixed fairing behind the tire in the retracted position.
Stock Cruisemasters have no fillet at all at the wing root. A common speed-up modification is to install Viking wing root fairings which have a considerable fillet. The popular story is that a university using a Cruisair for aeronautical research figured out that the wing root was one of the draggiest places on the aircraft and realized great speed improvements once a fillet was added. The only way to tell for sure is to try it. Here's an example as applied to a Cruisair: