---------------------------------------------------------- Europa-List Digest Archive --- Total Messages Posted Sat 05/05/18: 2 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 01:50 PM - 912ULS friction torque (jonathanmilbank) 2. 10:59 PM - Re: 912ULS friction torque (Alan Burrill) ________________________________ Message 1 _____________________________________ Time: 01:50:31 PM PST US Subject: Europa-List: 912ULS friction torque From: "jonathanmilbank" Using a calibrated fish weighing scale at 30" and after locking the crankshaft, while pulling steadily at right angles I once again got a reading of a couple of pounds over maximum; about 15 lbs instead of the recommended 13.2. I have an Airmaster hub with Warp Drive blades and the engine and gearbox have done over 200 hours since installation. The whole combination runs smoothly, with only a slight buzz while passing above 3000 rpm and which smooths out again above 4000. I've just done another oil and filter change which, as before, showed only a few pin-prick sized metal particles in the filter after being cut open. Same as always, with the particles being attracted to a strong magnet. Considering that all seems well and satisfactory, even though the anticipated reduction in friction torque with usage hasn't happened, should I be happy and just let sleeping dogs lie? What's wrong with having the torque so high? Read this topic online here: http://forums.matronics.com/viewtopic.php?p=479873#479873 ________________________________ Message 2 _____________________________________ Time: 10:59:26 PM PST US From: Alan Burrill Subject: Re: Europa-List: 912ULS friction torque =46rom the ROTAX Maint Manual: "Calculate friction torque (Nm) by multiplying the force (N) obtained on the spring scale by the distance the scale is attached from the center of the propeller (L). The friction torque must be between 30 Nm and max. 60 Nm (22 to 44.3 ft.lb). See calculation example." Where have you got the 13.2 from? Regards Alan Burrill > On 5 May 2018, at 21:50, jonathanmilbank wrote: > > > Using a calibrated fish weighing scale at 30" and after locking the crankshaft, while pulling steadily at right angles I once again got a reading of a couple of pounds over maximum; about 15 lbs instead of the recommended 13.2. > > I have an Airmaster hub with Warp Drive blades and the engine and gearbox have done over 200 hours since installation. The whole combination runs smoothly, with only a slight buzz while passing above 3000 rpm and which smooths out again above 4000. > > I've just done another oil and filter change which, as before, showed only a few pin-prick sized metal particles in the filter after being cut open. Same as always, with the particles being attracted to a strong magnet. > > Considering that all seems well and satisfactory, even though the anticipated reduction in friction torque with usage hasn't happened, should I be happy and just let sleeping dogs lie? What's wrong with having the torque so high? > > > > > Read this topic online here: > > http://forums.matronics.com/viewtopic.php?p=479873#479873 > > > > > > > > > ------------------------------------------------------------------------------------- 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.