---------------------------------------------------------- Yak-List Digest Archive --- Total Messages Posted Sat 06/26/21: 2 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 11:41 AM - Pneumatic Rigid Line Replacement (Rico Jaeger) 2. 08:29 PM - Re: Pneumatic Rigid Line Replacement (W LANNON) ________________________________ Message 1 _____________________________________ Time: 11:41:08 AM PST US From: Rico Jaeger Subject: Yak-List: Pneumatic Rigid Line Replacement Hey, All! I need to replace some problematic original Russian rigid air lines. I wou ld like to do that with a more flexible aluminum tubing. Has anyone else do ne this? And do you have any recommendations on what to use and where to ge t it? Thanks so much=85 Fly safe! Rico Jaeger 915 S 11th Ave Wausau, WI 54401 715. 529.7426 // Yak 52 / N21YK. ^/---//-X Hangar 21 / AUW. // // Ryan PT-22. ^/---//-X Hangar 35 / AUW. // EAA #345804 Warbird #13705 ________________________________ Message 2 _____________________________________ Time: 08:29:01 PM PST US From: W LANNON Subject: Re: Yak-List: Pneumatic Rigid Line Replacement Hi Rico; With no personal experience of the YAK 52 (or similar) I am assumi ng your are referring to the general pneumatic system which on the CJ6 uses alum. alloy tubing, mostly 6 mm and 8 mm OD with a wall thickness of 1mm. Also assuming these use the same end flaring process as the CJ. If all that is correct then it is a fair assumption that the tubing materia l is an equivalent to the US std. 5052 alloy. I think we can assume with a high degree of confidence that this is true for the CJ6. Another factor tha t would tend to include the Yak series in this assumption is the fact that both aircraft use the flare system for joint fitting. US std. 5052 is suppl ied in the correct hardness to allow for excellent flares, sufficient stren gth for low pressure systems and workability for bending and forming. In using the US std. 5052 tube as a replacement there are some things to co nsider. For the 1/4" 5052 X 0.035": 1. Wall burst failure would be at lower pressure than the original 6 mm X 1 mm. due increased wall area and slightly reduced thickness. Probably not o f major concern within the system pressure range. To ensure there is no red uction there is a 0,050" wall thickness available. 2. Modification of metric nut to fit over - 4 AN tube sleeve requires very careful analysis! 5052 tubing comes in 12 ft. lengths. There is another 1/4" tubing available on the US market. It comes in roll f orm, likely 3000 series alum. and should never be used in any aircraft syst em. Too thin, weak and soft. From: "Rico Jaeger" Sent: Saturday, June 26, 2021 11:40:48 AM Subject: Yak-List: Pneumatic Rigid Line Replacement Hey, All! I need to replace some problematic original Russian rigid air lines. I woul d like to do that with a more flexible aluminum tubing. Has anyone else don e this? And do you have any recommendations on what to use and where to get it? Thanks so much Fly safe! Rico Jaeger 915 S 11th Ave Wausau, WI 54401 715. 529.7426 // Yak 52 / N21YK. ^/---//-X Hangar 21 / AUW. // // Ryan PT-22. ^/---//-X Hangar 35 / AUW. // EAA #345804 Warbird #13705 ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message yak-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/Yak-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/yak-list Browse Digests http://www.matronics.com/digest/yak-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.