Talk:Contra-rotating propellers

message: Question : should this page include examples of and discuss tandem rotor helicopters? To me these are two different but similiar things : propellers give thrust to a fixed wing aircraft ( or whatever ) and tandem rotor are a special type of helicopter. 145.253.108.22 10:11, 11 January 2007 (UTC)
replies: text: I don't think tandem rotors should be discussed here because they are counter-rotating, not contra-rotating; the article explains the difference. In fact, barring objection in the next few days, I'll remove the reference to the tandem rotor helicopters (unless I forget).  Quickfoot 22:39, 23 February 2007 (UTC)
replies: text: Would it not be appropriate to mention tandem rotor helicopters that have coaxial rotors? This seems to fit the contra-rotating idea to me. See Helicopter and Coaxial rotors. SmokeySteve (talk) 08:18, 15 June 2008 (UTC)

text: Yes, any instance of coaxial rotors rotating opposite directions should be mentioned here. Binksternet (talk) 14:13, 15 June 2008 (UTC)
thread_title: Tandem rotor helicopters

message: I'm no expert in contra-rotation but wouldn't there be a small loss of efficiency caused by the second prop biting into the turbulent stream of the first prop? If so, it's worth a brief mention. Binksternet (talk) 17:23, 20 November 2007 (UTC)
thread_title: Turbulence between props

message: somebody should get the citations for this and put it in the main article.  minimizing turbulence is not the main advantage...
crucial to producing even supersonic air trust with CR props is the fact that when two CR blades meet, each going at near-supersonic absolute speed (e.g. relative to the ground), *relative to each other* they are actually moving twice as fast. so if the first blade pushes the air up to say 800kmh, the second one can give a ferocious 2nd slap to the already moving air because it actually hits it at +1600kmh. with 20'000hpXengine the TU95, e.g., could go supersonic without its CR blades going supersonic.  —Preceding unsigned comment added by 82.154.64.226 (talk) 22:27, 22 July 2008 (UTC)
replies: text: For anyone interested, Hermann Glauert was involved in investigating the theory of propellers - including contra-rotating propellers, back in the 1920s - "Hermann Glauert FRS, FRAeS (1892 – 1934)" - he said that there is a slight efficiency increase from using a CR propeller. So apart from the anti-torque and blade length advantages, there is also some gain in efficiency over a single airscrew.  — Preceding unsigned comment added by 80.4.57.101 (talk) 21:13, 23 February 2012 (UTC)
thread_title:  simple physics of CR props 

message: Can someone please either:  Create a section on marine propellers, OR split off another article specifically about contra-rotating marine propellers.  — Preceding unsigned comment added by Pmarshal (talk • contribs) 16:41, 9 July 2011 (UTC)
replies: text: I've fixed the link at USS Albacore (AGSS-569) to refer to what info WP has on marine contra-rotating props, not sure what other page(s) need this change.  There is a hatnote on this page, but it would be better titled "... (aircraft)".  DexDor (talk) 20:16, 9 July 2011 (UTC)
thread_title:  Several articles xref contra-rotating marine propellers point here but there is no mention in the article 

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replies: text: - Ahunt (talk) 01:36, 1 December 2016 (UTC)
thread_title:  External links modified 

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