---------------------------------------------------------- Europa-List Digest Archive --- Total Messages Posted Wed 01/18/17: 1 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 12:53 AM - Re: 1.5 degrees right? (jonathanmilbank) ________________________________ Message 1 _____________________________________ Time: 12:53:40 AM PST US Subject: Europa-List: Re: 1.5 degrees right? From: "jonathanmilbank" After consulting another aviation guru and asking him to read this interesting discussion, he emailed this reply which I'll paraphrase: "...the point about differential thrust around the rotation of the blade being sufficiently problematic to be worth disregarding the recommendation to have an offset. He is concerned about a 1.5 degree offset. But in reality, if the slip ball is not kept well centred by the pilot there will be a yaw angle between the fuselage and the relative airflow and 1.5 deg seems minimal. I have never noticed any issues with strange vibrations etc from being slightly out of balance. And even more relevant, the effect he mentions isn't just about a lateral angle between prop axis and direction of airflow, the exact same situation arises when there is a vertical angle between the prop axis and the relative airflow. Obviously this angle varies as the angle of attack varies, due to flying at differing weights, speeds, and g loadings. The angle of attack can probably vary by at least 10 degrees between low and high speed flight and this makes 1.5 degrees pale into insignificance. Also if you consider the prop tip speed vs the forward speed, the effect is diluted. Of course the aircraft will be quite flyable with or without the offset, but I think there will be less yaw with power effect with the offset. It's a bit like having differential ailerons - not essential but it makes the aircraft easier and more pleasant to fly (unless you like flying upside down!) and it will require less right rudder or right brake on a take-off roll which is surely a good thing from a performance point of view." Read this topic online here: http://forums.matronics.com/viewtopic.php?p=465180#465180 ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message europa-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/Europa-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/europa-list Browse Digests http://www.matronics.com/digest/europa-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.