---------------------------------------------------------- Europa-List Digest Archive --- Total Messages Posted Mon 04/26/21: 5 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 01:03 AM - Re: Re: Cruise speed data for Monowheel with 912ULS (D McFadyean) 2. 03:04 AM - Re: Cruise speed data for Monowheel with 912ULS (JohnFrance) 3. 05:06 AM - Re: Re: Cruise speed data for Monowheel with 912ULS (D McFadyean) 4. 07:01 AM - Re: Re: Cruise speed data for Monowheel with 912ULS (Pete Jeffers) 5. 09:22 AM - Re: Cruise speed data for Monowheel with 912ULS (n7188u) ________________________________ Message 1 _____________________________________ Time: 01:03:18 AM PST US From: D McFadyean Subject: Re: Europa-List: Re: Cruise speed data for Monowheel with 912ULS That would be a simple summary and allows access to a fuller potential of the engine. But ignores the additional work that has been published recently; if you're running 98 RON then you can do much what you like above 4000rpm. Possibly until any further data is published, such as detail of any resonant bands. Roll-on R3. Duncan McF. > On 25 April 2021 at 22:58 Griffo wrote: > > > > Soooo! > After all that, the advice remains; > For fixed pitch propellers (including ground adjust) - setting pitch to get a minimum 5200 rpm Static - will give you 5200 rpm on initiating take off (WOT) with the engine speed climbing as air speeds increases. Adjust climb angle to keep engine rpm below red line. > Cruise Climb & Cruise should be at a minimum of 5200 rpm. > I a nut shell - Rotax 91 engines thrive on /love rpm - you are not doing them any favours operating below the Rotax recommended engine speeds. > > -------- > 46 > > > > > Read this topic online here: > > http://forums.matronics.com/viewtopic.php?p=501517#501517 > > > > > > > > > ________________________________ Message 2 _____________________________________ Time: 03:04:38 AM PST US Subject: Europa-List: Re: Cruise speed data for Monowheel with 912ULS From: "JohnFrance" <77alembert@gmail.com> Just out of interest, when I search for SL-912-016R1 I only find the 2016 version even on the Rotax site. What am I missing? Regarding propeller settings on my mono, WOT static is 5400 rpm, WOT at 3500 near ISA conditions 5500 rpm, WOT climb @ 65 kts 5200. Cruise @28 MAP 135 kts and 5100 rpm using 20 ltr m/hr. The consumption is higher than I would like so I am now throttling back to around 27,2 which is around 5000 rpm. The propeller is a ground adjustable EProps V20 1,6m diameter. I hope this is useful. -------- Europa mono Nr 192 Read this topic online here: http://forums.matronics.com/viewtopic.php?p=501520#501520 ________________________________ Message 3 _____________________________________ Time: 05:06:26 AM PST US From: D McFadyean Subject: Re: Europa-List: Re: Cruise speed data for Monowheel with 912ULS https://www.flyrotax.com/services/technical-documentation.html > On 26 April 2021 at 11:04 JohnFrance <77alembert@gmail.com> wrote: > > > > Just out of interest, when I search for SL-912-016R1 I only find the 2016 version even on the Rotax site. What am I missing? > > Regarding propeller settings on my mono, WOT static is 5400 rpm, WOT at 3500 near ISA conditions 5500 rpm, WOT climb @ 65 kts 5200. Cruise @28 MAP 135 kts and 5100 rpm using 20 ltr m/hr. > The consumption is higher than I would like so I am now throttling back to around 27,2 which is around 5000 rpm. > The propeller is a ground adjustable EProps V20 1,6m diameter. > > I hope this is useful. > > -------- > Europa mono Nr 192 > > > > > Read this topic online here: > > http://forums.matronics.com/viewtopic.php?p=501520#501520 > > > > > > > > > ________________________________ Message 4 _____________________________________ Time: 07:01:43 AM PST US From: "Pete Jeffers" Subject: RE: Europa-List: Re: Cruise speed data for Monowheel with 912ULS Hi Revision 1 of this service letter was published in 2016 and refers to amongst others the 912 UL and 912 ULS. Revision 2 of the same SI was issued this year and refers to amongst other Rotax engines to the 912ULS. Critically not to the 912 US (80HP). Perhaps this may help. Pete -----Original Message----- From: owner-europa-list-server@matronics.com [mailto:owner-europa-list-server@matronics.com] On Behalf Of JohnFrance Sent: 26 April 2021 11:04 Subject: Europa-List: Re: Cruise speed data for Monowheel with 912ULS Just out of interest, when I search for SL-912-016R1 I only find the 2016 version even on the Rotax site. What am I missing? Regarding propeller settings on my mono, WOT static is 5400 rpm, WOT at 3500 near ISA conditions 5500 rpm, WOT climb @ 65 kts 5200. Cruise @28 MAP 135 kts and 5100 rpm using 20 ltr m/hr. The consumption is higher than I would like so I am now throttling back to around 27,2 which is around 5000 rpm. The propeller is a ground adjustable EProps V20 1,6m diameter. I hope this is useful. -------- Europa mono Nr 192 Read this topic online here: http://forums.matronics.com/viewtopic.php?p=501520#501520 -- This email has been checked for viruses by AVG. https://www.avg.com ________________________________ Message 5 _____________________________________ Time: 09:22:08 AM PST US Subject: Europa-List: Re: Cruise speed data for Monowheel with 912ULS From: "n7188u" I want to thank all of you that participated in this discussion. I personally have to say I have learned a lot in the subject of operating a Europa with a GA prop. I think that of particular value has been all the data received regarding RPM/MAP and speeds for the Europa monowheel. The discovery of the latest Rotax SL-912-016 is of particular interest. I still need to read this SL in detail but the chart presented is a total departure from all the information presented in the past. If I interpret it correctly, with RON 95, you have to be at 5500 RPM to be 100% sure you will not have a detonation event at WOT. On the other hand, anything over 4000 RPM with RON 98 @ WOT is safe. In the usual Rotax way, it leaves you scratching your head but I welcome the change. For now I decided to switch to premium 93 octane (US) straight E10 fuel. I was using 50-50 ethanol free 90 and premium 93 but in light of this chart I think the gain is safety, while I experiment with my prop, is huge if using the higher grade gasoline. But one set of data is of particular interest to me and would like to discuss further: JohnFrance: Your claim of being able to cruise at 5100/28" at 135 kts (indicated?) while still climb 5200/WOT at 65 kts is amazing and want to learn more. I do have a DUC Swirl that makes similar claims and once I finish testing my Woodcomp (which is not looking very impressive so far) I will try the DUC. But would like to learn more about this EProps V20. Great thread guys. this info is so important for those getting started with operating a Europa. (my next topic will be fuels :) ) Best Regards, Chris Read this topic online here: http://forums.matronics.com/viewtopic.php?p=501525#501525 ------------------------------------------------------------------------------------- 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.