Eli Posted February 26, 2010 Report Share Posted February 26, 2010 I am doing some analysis on planetary gears for my rotordynamics class and now I am on a mission to find a picture of gearbox internals from a twin turbine helicopter. Does anyone have a picture or exploded diagram of how two turbines are connected to one main rotor? I am particularly interested in the gear layout. Thanks! Eli Quote Link to comment Share on other sites More sharing options...
Elvis Posted February 26, 2010 Report Share Posted February 26, 2010 You have two different possibiltes here. There are real twins, or single engine helicopters that added a combiner gearbox to make them twins ( 205/212...350/355) Quote Link to comment Share on other sites More sharing options...
marc Posted February 26, 2010 Report Share Posted February 26, 2010 They new light twin turbines (427,429) have one single big gear with two input pinions that have freewheeling clutches on them. So there is no planetary reduction at all. Quote Link to comment Share on other sites More sharing options...
Eli Posted February 26, 2010 Author Report Share Posted February 26, 2010 They new light twin turbines (427,429) have one single big gear with two input pinions that have freewheeling clutches on them. So there is no planetary reduction at all. So the freewheeling clutch allows for any small difference in turbine speed and also allow one turbine to still power the rotor if the other fails? Also, are there additional gear reductions in the transmission? I hope this is not too dumb of a question but I have never seen the inside or a helicopter gearbox. Quote Link to comment Share on other sites More sharing options...
Phil Croucher Posted February 26, 2010 Report Share Posted February 26, 2010 Is this what you need? The AS 355 - it's my copyright but you can use it. Phil Quote Link to comment Share on other sites More sharing options...
Eli Posted February 26, 2010 Author Report Share Posted February 26, 2010 Thank you Phil, that is perfect! Quote Link to comment Share on other sites More sharing options...
rotorheadrob Posted February 26, 2010 Report Share Posted February 26, 2010 That Phil is a good guy! rob Quote Link to comment Share on other sites More sharing options...
Phil Croucher Posted February 27, 2010 Report Share Posted February 27, 2010 Thanks <blush>! Look for it in the 350 book which I finally got round to starting! Would welcome any tricks and tips anyone would like to pass on! Phil Quote Link to comment Share on other sites More sharing options...
widgeon Posted February 27, 2010 Report Share Posted February 27, 2010 http://www.aaib.gov.uk/cms_resources.cfm?f...2009_G-REDL.pdf Page 5 has a good diagram of puma. Last week I could have snagged a good one of the Apache , but all i have lrft now is the tee shirt Quote Link to comment Share on other sites More sharing options...
canukav8tor Posted February 27, 2010 Report Share Posted February 27, 2010 http://www.aaib.gov.uk/cms_resources.cfm?f...2009_G-REDL.pdf Page 5 has a good diagram of puma. Last week I could have snagged a good one of the Apache , but all i have lrft now is the tee shirt Yikes, Figure 4. has the hair on the back of my neck sticking straight out!!! :shock: Quote Link to comment Share on other sites More sharing options...
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