Talk:Horsepower

message: The opening statement of the section is wrong.  Power is force times velocity, or torque times angular velocity;  that notion is not constrained to torque and angular velocity being expressed in coherent or in any units, for that matter.
But then, this just brings me to: the section as a whole is entirely confusing;  the page is talking about Horsepower (a specific unit of power, and not power itself), but then it goes about calculating power (making mistaken claims about the torque and angular velocity being required to be in certain units).  The statement after the first formula is also incorrect:  one does not require a factor;  the calculated power is the calculated power.  The statement would be correct if it was talking about calculating power in Watts;  but then, again, the whole section is confusing, as it is talking about power (not Horsepower, which is what the page is about), and to make things worse, in the Horsepower page, the calculations for power start with the assumption that the calculation must result in Watts?
I think the section should either talk about Calculating Horsepower (not sure that's the correct phrasing; in any case, Calculating power in HP units), or, if talking about Calculating power, then let's rewrite to avoid the confusion about the units;  Power is torque times angular velocity, and then go on about "if we want the result expressed in XXX units, then ... " (perhaps particular examples of units)
Then again, on third thought.... Why would this page need a section on calculating power?  There is a Wikipedia page for power, where it shows how it is calculated. Since we would never calculate power to result directly in HP (since no-one uses a unit of force that corresponds to 550 pound-force), then why talk about this?  IMHO, the only important thing (related to power and other units) in a page about 'Horespower' is the conversion factor to/from other units (notably, the Watt).
Cal-linux (talk) 17:43, 21 May 2021 (UTC)
replies: text: Agreed, and I have removed the section, which is also unsourced. This has been bothering me for a while, but it was more of a nagging feeling and hadn't really risen to the level of an objection I could articulate. Thank you for putting this in to words. GA-RT-22 (talk) 17:55, 21 May 2021 (UTC)
thread_title:  Section 2 (Calculating Power) is all wrong 

message: This article  seems to say that France no longer uses the formula given in the "Tax horsepower" section. Also I don't see why we're giving the formula for France and not for any of the other 200 countries in the world. We should just describe the concept and not give any formulae. Anyone interested in the details can click through to Tax horsepower. GA-RT-22 (talk) 13:24, 22 May 2021 (UTC)
thread_title:  Fiscal horsepower in France 

message: An anonymous editor removed this: "In 1972, the PS was replaced by the kilowatt as the official power-measuring unit in EEC directives." The edit summary says "Might be true, but is an unreferenced claim as the cited document does not exist." The document certainly does exist. Here is the title and reference: . I have not read it, but it does exist. GA-RT-22 (talk) 19:17, 5 November 2021 (UTC)
replies: text: If you took the trouble to click on the provided citation, you will discover that it says that the document does not exist. You have thus reverted an uncited claim, removal of which does not have to be discussed on the talk page. 81.157.153.208 (talk) 14:31, 6 November 2021 (UTC)
replies: text: The wording is misleading. It doesn't mean that the document "Council Directive 71/354/EEC" does not exist. It just means that the url is 404. On Wikipedia we call that a "dead link". We do not remove content just because of a dead link. See Wikipedia:Link rot. GA-RT-22 (talk) 14:46, 6 November 2021 (UTC)
replies: text:  There is no mention of an error 404 or any hint that the document used to exist but no longer does. The wording is, "The requested document does not exist.". That is not open to misinterpretation, its meaning could not be clearer. You may not have read the document at the link that you provided, but you did miss the bit that the document is no longer extant having been repealed so is not a valid cite anyway. 81.157.153.208 (talk) 17:38, 6 November 2021 (UTC)

text: I just (belatedly) added an archived link and removed the warning.  Mr.choppers | ✎  14:48, 13 August 2022 (UTC)
thread_title:  PS in EU 

message: Re this edit: 
"Already mentioned further down" is not a reason to remove this. Everything in the lead is mentioned further down; see WP:LEAD. Personally I would leave this in. GA-RT-22 (talk) 23:34, 29 November 2021 (UTC)
replies: text: Fine detail of the unit is perfectly fine in lower sections but doesn't really belong in the lead. However, I'm not super dead-set against it. I still prefer it lower down but if you do put it back in the lead then perhaps reword it.  Stepho  talk  22:33, 2 December 2021 (UTC)
replies: text: Well I'm not dead-set in favor of including it either. I'm usually a fan of short leads anyway. We've got the definition, conversion to standard units, and a bit of history, so I'll defer on this one. GA-RT-22 (talk) 22:52, 2 December 2021 (UTC)
replies: text: How strange - a civil discussion on Wikipedia :) Thanks!  Stepho  talk  00:48, 4 December 2021 (UTC)
thread_title:  Horse power output in the lead 

message: The section on NHP says it's calculated from piston area and speed, which makes it sound like it would only make sense for piston engines. But turbine engines have NHP too. How is that calculated? An example is at  which cites  as its source. GA-RT-22 (talk) 23:01, 23 August 2022 (UTC)
thread_title:  NHP for turbines 

message: The first part of this section made no sense. It effectively stated:
P1 - L1 = P2 - L2
P2 - L2 = P3 - L3
P3 - L3 = P4
therefore:
P1 - L1 = P4
where:
	P1 is gross power
	P2 is brake power at crankshaft
	P3 is power at output of transmission
	P4 is power at power at wheels;
	L1 is losses within the engine
	L2 is losses in the transmission (gearbox?)
	L3 is losses in the prop shaft, axle etc.
I have rearranged the content to the form:
P2 = P1 - L1;
P3 = P2 - L2;
P4 = P3 - L3;
I acknowledge that the expressions 'indicated horsepower', 'shaft horsepower' etc. are misnomers (should be 'indicated power', 'shaft power' etc., regardless of the units used, 'horsepower' being the unit historically used in measuring power) but I have left them in because they are in common use among some who deal with engines, hence the abbreviations 'nhp', 'ihp', 'bhp' etc. 203.23.239.198 (talk) 02:42, 25 September 2022 (UTC)
thread_title:  Measurement 

message: You are invited to join the discussion at Talk:HP Inc. § Requested move 13 May 2024.  InfiniteNexus (talk) 19:13, 22 May 2024 (UTC)
thread_title: Discussion at [[:Talk:HP Inc.#Requested move 13 May 2024|Talk:HP Inc. §&nbsp;Requested move 13 May 2024]]