Talk:Airspeed indicator

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"The airspeed indicator is especially important for monitoring V-Speeds while operating an aircraft. However, in large aircraft, V-speeds can vary considerably depending on airfield elevation, temperature and aircraft weight. For this reason the coloured ranges found on the ASIs of light aircraft are not used - instead the instrument has a number of moveable pointers known as bugs which may be preset by the pilot to indicate appropriate V-speeds for the current conditions."

Most small aircraft in the US do not have moveable pointers. Indicated stall speed does not vary with altitude and temperature, only weight, and only slightly within the acceptible (certified) range. I think this needs clarification.

[edit] Confusion VA vs VNO ?

One of the most important V Speeds that is not marked on airspeed indicators for light aircraft is VA
(maneuvering  speed, the speed at which full and abrupt control movement can be applied without causing structural
damage.

From the V speed page : VNO is the speed at which structural damage can occur, VA being the speed at which stall can occur during sharp turns. So either this sentence is wrong or the V_speeds page isn't very clear--Yitscar 15:04, 22 October 2007 (UTC)

From a few lines up in the article:

"The red line is preceded by a yellow band which is the caution area, which runs from VNO (maximum structural cruise speed) to VNE."

You're exactly right. A plane cruising at V_A will stall before it exceeds the positive-G load limit, but on most aircraft pushing forward can still exceed the (usually lower) negative-G limit. There also can be other aerodynamic forces below V_A that can damage the airplane, such as the lateral forces on the vertical stab that brought down American Airlines 587. Under V_NO, however, an airplane in the "clean" configuration (no flaps) can handle any aerodynamic forces, wether they come about from wind gusts or control inputs. And, unlike V_A, V_NO is marked on the airspeed indicator, by the top of the green arc. The idea that "you can't break the airplane below maneuvering speed" is a common, potentially dangerous misconception. 68.5.141.240 (talk) 05:35, 28 February 2008 (UTC)

[edit] Fair use rationale for Image:Airspeed tape.png

Image:Airspeed tape.png is being used on this article. I notice the image page specifies that the image is being used under fair use but there is no explanation or rationale as to why its use in this Wikipedia article constitutes fair use. In addition to the boilerplate fair use template, you must also write out on the image description page a specific explanation or rationale for why using this image in each article is consistent with fair use.

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BetacommandBot (talk) 23:20, 7 March 2008 (UTC)

[edit] Lift Reserve Indicator

I questions whether this section should be part of Airspeed indicator or a totally new article. A LRI is not an airspeed indicator. It also seems that the section "teaches" use of a LRI; Wikipedia is NOT a teacher. There might also be an element of commercial promotion in the section. Comments from other users welcomed.Geoffrey Wickham (talk) 04:50, 25 March 2008 (UTC)