This datum varies as it is based on the eye level of the users. These include thermostats, alarm systems, the occasional wall mounted iPad, and any other screen-read device. There are a host of devices which cater more to the eye than to the hand. No sense in forcing alignment just for the sake of principle. Cabinets are their own beast, and we’ve found a kit of parts that works. In the past, we have wrangled the alignment of cabinet heights and door/window header heights (and have made it work), but the detailing and coordination during construction is fussy and quickly becomes a time-suck. While cabinet countertop surfaces maintain a consistent datum with other elements of a project, we’ve found that the top of full-height cabinets need to operate on their own. Adhering to this datum also makes the exterior wall framing straight-forward. This dimension is based on standard door and window heights as well as effective sight-lines within the structure. There are of course exceptions, but for the most part this is a common datum on our projects. It’s not necessary in the strictest sense, but it does wonders for reducing visual clutter, streamlining the user experience, and creating a predictable set of instructions for the construction.ĭoor and window head heights are typically set at 80″ or 84″. The thinking is that anything a person would reach out to grasp should all be within the same plane- predictable to the point that you could maneuver around your house in the dark. Years ago, we made the decision to align these elements across the board, and we haven’t looked back. The objects we interact with in a space (switches, plugs, knobs) are maintained along their own datum. Outside, common adjacencies involve guardrails and windows, so it helps to have a common horizontal geometry between the two for visual harmony. This datum line becomes all the more prominent inside as the backsplash band begins at the countertop level. It also defines a consistent location for horizontal window mullions and other built-in surfaces. This mid-range datum is defined primarily by guardrail and countertop standard heights. Today’s post covers the horizontal datum lines we adhere to on our projects along with a bit of rationalizing.
While not everything on a project can be perfectly aligned all the time (placement follows function), we find that there are horizontal datum bands that can effectively guide the placement of just about everything required of an interiors package. We’ve covered the subject in multiple posts and today’s post takes a closer look at the importance of simply lining things up. For aircraft with a Type Certificate Data Sheet, the equipment list is a separate document.The subject of alignment and reducing visual clutter is well-tread territory in the world of modernism, as well as the pages of this blog.
The Aircraft Specifications typically included the aircraft equipment list. Aircraft certified since 1958 fall under the FAA and have their weight and balance information contained in a document known as a Type Certificate Data Sheet. Aircraft certified prior to 1958 fell under the Civil Aeronautics Administration, and had their weight and balance information contained in a document known as Aircraft Specifications. The location of the datum is identified in the Aircraft Specifications or Type Certificate Data Sheet. Datum location and its effect on positive and negative arms. Figure 4-1 shows an aircraft with the leading edge of the wing being the datum. The manufacturer has the choice of locating the datum where it is most convenient for measurement, equipment location, and weight and balance computation. It might be located at or near the nose of the aircraft, a specific number of inches forward of the nose, at the engine firewall, at the center of the main rotor shaft of a helicopter, or any place that can be imagined. For example, it would not be a good idea to have the datum be the tip of the propeller spinner or the front edge of a seat, because changing to a new design of spinner or moving the seat would cause the datum to change. There is no fixed rule for the location of the datum, except that it must be a location that will not change during the life of the aircraft.
For example, the fuel in a tank might be 60 inches (60″) behind the datum, and a radio on the flight deck might be 90″ forward of the datum. For each aircraft make and model, the location of all items is identified in reference to the datum. If the datum was viewed on a drawing or photograph of an aircraft, it would appear as a vertical line which is perpendicular (90 degrees) to the aircraft’s horizontal axis. The datum is an imaginary vertical plane from which all horizontal measurements are taken for balance purposes, with the aircraft in level flight attitude.
0 kommentar(er)
