Doug Evans Posted January 9, 2012 Share Posted January 9, 2012 how do u work out the best suited Gear box ratio & prop size & pitch too gain the best climb & cruicse for a given hp & air craft type "Lightwng " is there anyone that know that stuff ? EG C type 3 to 1 ratio suit a 72 '' prop with 65 hp rotax what will that give climb or speed ? Cheer Doug Link to comment Share on other sites More sharing options...
fly_tornado Posted January 9, 2012 Share Posted January 9, 2012 have you tried asking another Lightwing owner or the factory? Link to comment Share on other sites More sharing options...
Doug Evans Posted January 10, 2012 Author Share Posted January 10, 2012 yes Link to comment Share on other sites More sharing options...
fly_tornado Posted January 10, 2012 Share Posted January 10, 2012 what did they say? Link to comment Share on other sites More sharing options...
RickH Posted February 20, 2012 Share Posted February 20, 2012 Hey Doug From memory the 582 rotax redlines at 6800 rpm 3:1 ratio means 2266 max prop rpm you should set the pitch of the prop so that with the Bird tied down and max throttle the engine will develope about 6400 max rpm this should allow it to reach 6800 when on the move. This means the prop is running at max efficiency for that engine prop combination . If you set the prop pitch finer than this (similar to low gear in a car) you will get better take off preformance but you risk an engine overspeed (not good) if you set prop to a courser pitch (high gear) the bird will Theoretically cruise faster but the engine will not develope it's full h.p.( also not good) Hope this is helpfull to you. Regards RickH Link to comment Share on other sites More sharing options...
Doug Evans Posted February 20, 2012 Author Share Posted February 20, 2012 Thanks Rick I was advised by rotax too run the 2.62 ratio C type so that what I end up with , my old lightwing ran 3.1 C type with a 3 blade 68" warpdrive Not shore what prop I run yet I have a 2 blade 68 " lightwing prop I will try but most likely run a 2 blade ground adjustable in the future if the old lightwing one dose not work .... Link to comment Share on other sites More sharing options...
RickH Posted February 20, 2012 Share Posted February 20, 2012 Doug My boss has an X_Air running a 582rotax with 68 inch brolga prop 3 blade which I often fly,runs damn fine. Regards Rick Link to comment Share on other sites More sharing options...
robinsm Posted February 21, 2012 Share Posted February 21, 2012 currently running Xair Standard 582 blue head. c box 3:1 Brolga 68 inch 16 degrees pitch. Runs beautifully. Link to comment Share on other sites More sharing options...
Doug Evans Posted February 22, 2012 Author Share Posted February 22, 2012 thank fellows for your input Link to comment Share on other sites More sharing options...
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