Editing Pusher configuration (section)

==== Center of gravity and landing gear considerations ====
To maintain a safe [[center of gravity]] (CG) position, there is a limit to how far aft an engine can be installed.<ref>{{cite web |first= J. Mac|last= McClellan|title= Flashback to 1981: A Look Back at the Lear Fan|work= Flying|date= 24 June 2006|url= http://www.flyingmag.com/pilot-reports/turboprops/flashback-1981-look-back-lear-fan?page=0,1|access-date= 20 October 2011|url-status= live|archive-url=https://web.archive.org/web/20110905231551/http://www.flyingmag.com/pilot-reports/turboprops/flashback-1981-look-back-lear-fan?page=0,1|archive-date= 5 September 2011}}</ref> The forward location of the crew may balance the engine weight and will help determine the CG. As the CG location must be kept within defined limits for safe operation load distribution must be evaluated before each flight.<ref>{{cite web|title=Cozy Mk IV|first1= Brien|last1= Seeley|first2= C.J.|last2= Stephens|others= The CAFE Board|publisher= CAFE Foundation|work= Aircraft Performance Reports|url= http://cafefoundation.org/v2/pdf_cafe_apr/Cozy%20IV%20APR.pdf|url-status= dead|archive-url= https://web.archive.org/web/20101027001413/http://cafefoundation.org/v2/pdf_cafe_apr/Cozy%20IV%20APR.pdf|archive-date= 27 October 2010}}</ref><ref group="note">In the case of the Cozy IV, a side-by-side four-seater, an absent copilot must be balanced with 20 kg (40 lb) in the nose of the aircraft (Cafe Aircraft Performance Report)</ref>

Due to a generally high thrust line needed for propeller ground clearance, negative (down) pitching moments, and in some cases the absence of prop-wash over the tail, a higher speed and a longer roll may be required for takeoff compared to tractor aircraft.<ref>{{cite web|first= David|last= Odum|date= 2003|url= http://www.airplanezone.com/Oshkosh/Scrapbook2003/Prescott_Pusher.html|title= Oshkosh 2003 Scrapbook|website= www.airplanezone.com|publisher= Airplane Zone|url-status=live|archive-url= https://web.archive.org/web/20120425061601/http://www.airplanezone.com/Oshkosh/Scrapbook2003/Prescott_Pusher.html|archive-date= 25 April 2012}}</ref><ref>http://www.kitplanes.com/magazine/pdfs/Grinvalds_Orion_0409.pdfOrion{{dead link|date=January 2018 |bot=InternetArchiveBot |fix-attempted=yes }} V1(rotation speed): 65 kn</ref><ref>{{cite tech report|first= Lester H.|last= Berven |title= BD-5 Flight Test Program Report|institution= Bede Aircraft Corporation|via= Journal of the Society Of Experimental Test Pilots|url=http://www.bd5.com/testberven.htm |url-status=live |archive-url=https://web.archive.org/web/20111119134850/http://bd5.com/testberven.htm |archive-date= 19 November 2011}}</ref> The [[Burt Rutan|Rutan]] answer to this problem is to lower the nose of the aircraft at rest such that the empty center of gravity is then ahead of the main wheels. In [[autogyro]]s, a high thrust line results in a control hazard known as [[power push-over]].