Anyway, one major attribute of a push-pull tube is its capability for transferring control movements through a single link (tube) positively and in direct proportion to the control input.Ī single push-pull tube can transfer either tension or compression loads (stresses) whereas a control cable system can only handle tension loads. It is also said in those ancient tomes just referenced that push-pull tubes eliminate the problem of varying cable tensions (even if the problem is no problem. Another aircraft several years its junior likewise seems to defy the need for "frequent (or infrequent) adjustment".Įven though cable control systems are without this alleged fault, there are some aircraft designs that are better suited to push-pull control systems. However, I happen to have a personal acquaintance with one 14 year old homebuilt aircraft that has not had its control cables adjusted in all those years. In the years to follow, one writer after another perpetuated that same spiel as gospel.
I guess some expert, many years ago through logical reasoning, figured that such tension changes must take place in cables and duly recorded his conclusions as fact for posterity.
#Pulltube max manuals
Some very authoritative books and manuals state in absolute terms that the main disadvantage of using cables for control linkages is that their tension must be adjusted frequently due to stretching and temperature changes. FIRST, LET ME set the record straight on one thing in the matter of push-pull control systems vs.
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