---------------------------------------------------------- Europa-List Digest Archive --- Total Messages Posted Tue 11/13/12: 10 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 12:32 AM - Re: Question for 914 users (conrad) 2. 02:51 AM - Re: Re: Question for 914 users (Kingsley Hurst) 3. 03:00 AM - Re: Re: Question for 914 users (Gilles Thesee) 4. 11:05 AM - rotax Tacho verses digital (graeme bird) 5. 11:18 AM - Re: rotax Tacho verses digital (Robert Borger) 6. 11:46 AM - Re: rotax Tacho verses digital (Pete Lawless) 7. 11:57 AM - Re: rotax Tacho verses digital (Frans Veldman) 8. 01:02 PM - Re: rotax Tacho verses digital (Mark Burton) 9. 01:33 PM - Re: Re: rotax Tacho verses digital (Peter Jeffers) 10. 08:07 PM - Re: Re: Question for 914 users (Kingsley Hurst) ________________________________ Message 1 _____________________________________ Time: 12:32:55 AM PST US Subject: Europa-List: Re: Question for 914 users From: "conrad" *Warning* Do not attempt to take off with the TCU disabled. If the wastegate is fully closed when the TCU is powered down you will end up over boosting your engine with the possibility of twisting a crankshaft or burning a piston kingsnjan(at)westnet.com. wrote: > Peter, > > Having said that, I can certainly try a T/O with the TCU turned off to observe what happens. > > > > Read this topic online here: http://forums.matronics.com/viewtopic.php?p=387748#387748 ________________________________ Message 2 _____________________________________ Time: 02:51:19 AM PST US Subject: Re: Europa-List: Re: Question for 914 users From: Kingsley Hurst Conrad, Thank you very much for the sage advice. Just thinking....... I don't really need to know what happens! Cheers Kingsley Sent from my iPhone On 13/11/2012, at 6:32 PM, "conrad" wrote: > > *Warning* > Do not attempt to take off with the TCU disabled. If the wastegate is fully closed when the TCU is powered down you will end up over boosting your engine with the possibility of twisting a crankshaft or burning a piston > > > > kingsnjan(at)westnet.com. wrote: >> Peter, >> >> Having said that, I can certainly try a T/O with the TCU turned off to observe what happens. > > > > > Read this topic online here: > > http://forums.matronics.com/viewtopic.php?p=387748#387748 > > > > > > > > > > ________________________________ Message 3 _____________________________________ Time: 03:00:49 AM PST US From: Gilles Thesee Subject: Re: Europa-List: Re: Question for 914 users Kingsley Hurst a crit : > > Conrad, > > Thank you very much for the sage advice. Just thinking....... I don't really need to know what happens! > Kingsley, Just to make sure. Have you checked that the throttle cables do respond correctly to the throttle lever movements ? IIRC, there have been some instances of cables buckling instead of sliding in their outer cases when one relies only on springs to open the butterflies in the carburettors. To prevent this situation, our airplanes are equipped with solid piano wire 'cables' providing some push-pull action. The carb springs are just there for peace of mind. FWIW, Best regards, -- Gilles http://contrails.free.fr ________________________________ Message 4 _____________________________________ Time: 11:05:58 AM PST US Subject: Europa-List: rotax Tacho verses digital From: "graeme bird" Interesting that compared to my new digital tacho that controls the VP prop, the rotax tacho over-reads by around 150rpm. Id trust the digital rather than the needle but I wondered if anyone else has found the same? while mentioning needles - my flight sunday took me past a couple. -------- Graeme Bird G-UMPY Mono Classic/XS FWFD 912ULS/Woodcomp 3000/W Newby: 35 hours g(at)gdbmk.co.uk Read this topic online here: http://forums.matronics.com/viewtopic.php?p=387771#387771 Attachments: http://forums.matronics.com//files/dsc01045neddles_iow_196.jpg ________________________________ Message 5 _____________________________________ Time: 11:18:05 AM PST US Subject: Re: Europa-List: rotax Tacho verses digital From: Robert Borger Graeme, Beautiful picture! Blue skies & tailwinds, Bob Borger Europa XS Tri, Rotax 914, Airmaster C/S Prop. Little Toot Sport Biplane, Lycoming Thunderbolt AEIO-320 EXP 3705 Lynchburg Dr. Corinth, TX 76208-5331 Cel: 817-992-1117 rlborger@mac.com On Nov 13, 2012, at 1:05 PM, graeme bird wrote: Interesting that compared to my new digital tacho that controls the VP prop, the rotax tacho over-reads by around 150rpm. Id trust the digital rather than the needle but I wondered if anyone else has found the same? while mentioning needles - my flight sunday took me past a couple. -------- Graeme Bird G-UMPY Mono Classic/XS FWFD 912ULS/Woodcomp 3000/W Newby: 35 hours g(at)gdbmk.co.uk Read this topic online here: http://forums.matronics.com/viewtopic.php?p=387771#387771 Attachments: http://forums.matronics.com//files/dsc01045neddles_iow_196.jpg ________________________________ Message 6 _____________________________________ Time: 11:46:05 AM PST US From: "Pete Lawless" Subject: RE: Europa-List: rotax Tacho verses digital Hi Graeme Has the Rotax tacho been calibrated? If not they are often inaccurate. Mine certainly was. Regards Pete -----Original Message----- From: owner-europa-list-server@matronics.com [mailto:owner-europa-list-server@matronics.com] On Behalf Of graeme bird Sent: 13 November 2012 19:05 Subject: Europa-List: rotax Tacho verses digital Interesting that compared to my new digital tacho that controls the VP prop, the rotax tacho over-reads by around 150rpm. Id trust the digital rather than the needle but I wondered if anyone else has found the same? while mentioning needles - my flight sunday took me past a couple. -------- Graeme Bird G-UMPY Mono Classic/XS FWFD 912ULS/Woodcomp 3000/W Newby: 35 hours g(at)gdbmk.co.uk Read this topic online here: http://forums.matronics.com/viewtopic.php?p=387771#387771 Attachments: http://forums.matronics.com//files/dsc01045neddles_iow_196.jpg -- This message has been scanned for viruses and dangerous content by MailScanner, and is believed to be clean. ________________________________ Message 7 _____________________________________ Time: 11:57:34 AM PST US From: Frans Veldman Subject: Re: Europa-List: rotax Tacho verses digital On 11/13/2012 08:05 PM, graeme bird wrote: > Interesting that compared to my new digital tacho that controls the > VP prop, the rotax tacho over-reads by around 150rpm. Id trust the > digital rather than the needle but I wondered if anyone else has > found the same? As far as I know it can be somewhat tricky to connect two tacho's at the same time. It is a weird interface, nor digital nor analogue. You can't trust either of them. If you really want to know, you'd better check the rpm against a seperate rev counter on the prop and recalculate this to engine RPM and see if it matches with any of your gauges. > while mentioning needles - my flight sunday took me past a couple. Very nice! I presume this was in the UK? Is this near land's end? Frans ________________________________ Message 8 _____________________________________ Time: 01:02:51 PM PST US Subject: Europa-List: Re: rotax Tacho verses digital From: "Mark Burton" Hi, The Rotax tacho really cannot be trusted. Many years ago, one of my customers told me that when he fitted a CSC-1/P constant speed controller, it showed 600 RPM more than the Rotax tacho! So when the customer thought he was using around 5700 RPM on takeoff he had actually been using 6300 every time. Somewhat ironic that installing the CS controller actually reduced his takeoff performance by about 10% (but hopefully prolonged the life of his 912S). The Rotax tacho has a little pot in it you can twiddle to adjust the displayed RPM but it's impossible to get at when the thing is in situ. Also, if memory serves me right, Rotax decreed that it should be calibrated something like every 50 hours! Cheers, Mark Read this topic online here: http://forums.matronics.com/viewtopic.php?p=387781#387781 ________________________________ Message 9 _____________________________________ Time: 01:33:29 PM PST US From: "Peter Jeffers" Subject: RE: Europa-List: Re: rotax Tacho verses digital My experience would show as with Mark that the Rotax RPM gauges are not to be trusted. My original was some 200rpm under reading when new. Europa re calibrated it but some 2 years later it had gone way out again. I rely on the digital readout from my EIS from Grand Rapids. Pete Jeffers -----Original Message----- From: owner-europa-list-server@matronics.com [mailto:owner-europa-list-server@matronics.com] On Behalf Of Mark Burton Sent: 13 November 2012 21:02 Subject: Europa-List: Re: rotax Tacho verses digital Hi, The Rotax tacho really cannot be trusted. Many years ago, one of my customers told me that when he fitted a CSC-1/P constant speed controller, it showed 600 RPM more than the Rotax tacho! So when the customer thought he was using around 5700 RPM on takeoff he had actually been using 6300 every time. Somewhat ironic that installing the CS controller actually reduced his takeoff performance by about 10% (but hopefully prolonged the life of his 912S). The Rotax tacho has a little pot in it you can twiddle to adjust the displayed RPM but it's impossible to get at when the thing is in situ. Also, if memory serves me right, Rotax decreed that it should be calibrated something like every 50 hours! Cheers, Mark Read this topic online here: http://forums.matronics.com/viewtopic.php?p=387781#387781 ----- No virus found in this message. Checked by AVG - www.avg.com ________________________________ Message 10 ____________________________________ Time: 08:07:37 PM PST US Subject: Re: Europa-List: Re: Question for 914 users From: Kingsley Hurst Gilles, Thank you again. Yes the levers on the carbs move in unison no matter how fast the throttle lever is advanced. The whole operation is very smooth and fluent. I'm no expert on any of this stuff I can assure you but I would expect the engine not to run smoothly if a throttle cable was to lag the throttle movement. The engine runs like a sewing machine and my only observation is that the MAP seems slower to rise than expected be it true or imaginary! Hence my dilemma. Best regards Kingsley Sent from my iPhone On 13/11/2012, at 9:00 PM, Gilles Thesee wrote: > > Kingsley Hurst a crit :! >> > > Kingsley, > > Just to make sure. Have you checked that the throttle cables do respond correctly to the throttle lever movements ? > IIRC, there have been some instances of cables buckling instead of sliding in their outer cases when one relies only on springs to open the butterflies in the carburettors. > > To prevent this situation, our airplanes are equipped with solid piano wire 'cables' providing some push-pull action. The carb springs are just there for peace of mind. > > FWIW, > Best regards, > -- > Gilles > http://contrails.free.fr ------------------------------------------------------------------------------------- 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.