Paul Webb 3 Posted July 19, 2017 Share Posted July 19, 2017 I am new to this site but not new to flying aircraft which i have been doing for over 50 years. Built and flew Atom a couple of years ago with some success, so thought I would try the Cruiser. Build went together nicely, set all the correct angles for left head tilt and left engine thrust, blade plate at +5degrees incidence and set hang angle at -17 degrees because this worked ok on the Atom. Maiden flight went well except for the permanent tail down attitude at mid or low throttle. Changed the blade plate incidence to +3 instead of +5 but this made no difference to the tail hang problem. I did notice that the blades made according to the plan had a wider chord than the Atom and Richards cruiser photo's in RCM&E, is this creating more lift? if anyone can suggest a solution to the tail hang problem i would be very grateful. Paul Quote Link to comment Share on other sites More sharing options...
Denis Watkins Posted July 19, 2017 Share Posted July 19, 2017 Paul, Hi, help me out before I say C of G What is a Cruiser please? Quote Link to comment Share on other sites More sharing options...
Steve Jones 2 Posted July 19, 2017 Share Posted July 19, 2017 Nose up would suggest adding a little more neg shim to blades. Try adding 0.4mm. If better add a bit more Quote Link to comment Share on other sites More sharing options...
Piers Bowlan Posted July 19, 2017 Share Posted July 19, 2017 I guess the man to speak to Paul is the designer, Richard Harris. Here is a thread where you may get inspiration but when in doubt PM Rich. Welcome to the forum by the way. Edited By Piers Bowlan on 19/07/2017 17:42:23 Quote Link to comment Share on other sites More sharing options...
Richard Harris Posted July 19, 2017 Share Posted July 19, 2017 Denis, Cruiser was a free pull out plan a few years ago, here is a photo of my enlarged version which I have been using as a test bed for a two blade set up with suprisingly good results over the last month or two. Paul, Welcome to the forum, what you are explaining could be a number of things. But, if you have stuck to the plan and all angles and dangles are correct it has to be the blades as this is really the only thing that could differ. My thoughts are the same as Steve's, try adding a small amount of shim to the blades. It sounds like you are getting too much lift and when you get to a certain power level the down thrust is over coming the drag/ lift from the blades. The extra shim will kill a bit of lift from the blades which will bring the nose back in tow. I would had slithers of tape and test inbetween until you hit the sweet spot. If you have experience on the Atom then the Crusier will cause you no problems once set up, its my favourite flying autogyro to date. Let us know how it goes? Rich Edited By Richard Harris on 19/07/2017 22:45:36 Quote Link to comment Share on other sites More sharing options...
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