---------------------------------------------------------- Europa-List Digest Archive --- Total Messages Posted Fri 10/30/15: 11 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 03:03 AM - Re: Rotax 912S mixture vs mag drop (jonathanmilbank) 2. 05:47 AM - Re: Rotax 912S mixture vs mag drop (rampil) 3. 10:54 AM - Tri Gear Main Wheels (Kelvin Weston) 4. 11:15 AM - Re: Tri Gear Main Wheels (Richard Wheelwright) 5. 12:07 PM - Re: Tri Gear Main Wheels (Steve Hagar) 6. 01:34 PM - Re: Tri Gear Main Wheels (Robert Borger) 7. 01:54 PM - Re: Tri Gear Main Wheels (Kelvin Weston) 8. 02:43 PM - Europa XS Simulation for Android. (Steve) 9. 05:32 PM - Re: Europa XS Simulation for Android. (rampil) 10. 06:07 PM - BRS (Wladimir Kummer) 11. 08:26 PM - Re: BRS (Fred Klein) ________________________________ Message 1 _____________________________________ Time: 03:03:51 AM PST US Subject: Europa-List: Re: Rotax 912S mixture vs mag drop From: "jonathanmilbank" From: "Erich Trombley" Feb 27, 2009 Subject: large mag drop on both mags, 912uls While I can't speak to the 912ULS (I have a 914), I can share this story with you. I too had mag excessive drop (600 + rpm) but only on one mag. I tried everything I could think of including new spark plugs, plug wires, swapping coils, purchasing a new coil, and overall conducting a very methodical diagnostic test program. All to no avail. I could not figure out what was going on with the engine. To make matters worse the problem seemed to have resolved itself without me changing anything. I was pulling my hair out. As silly as this is going to sound, it turned out to be mixture. Yes, mixture. Interesting it was a function of ambient temperature. All of my testing was conducted on the trailer in an unheated garage with the garage door wide open and it was cold. It was only after the ambient temps increased that the problem seemed to have gone away, however, I hadn't made that connection yet. Not realizing what was going on and with the problem having seemed to have fixed itself I made arrangements with a flight instructor to conduct a flight with me the following morning. Well, as you can probably see where this is going, we got to the airport in the morning and put the plane together. I started up the plane and conducted a mag check. The problem was back, yet I hadnt changed a thing. Also, I might add that even with the excessive mag drop the engine ran very smooth. As such, the instructor suggested we take it up and see how it performed in the pattern. There were no issues on the take-off roll and we continued with the flight. After one circuit in the pattern, I performed a mag drop on downwind... perfect not even 100 rpm drop. The engine was running perfectly, although I did not know why. It was during the Rotax class I learned why. The instructor asked if anyone had experienced significant mag drop. I raised my hand, Yes, yes, I have, I proclaimed. The instructor proceeded to walk me down a path asking other questions such as, was the first time I noted the problem in the winter season or was it year round, winter, I replied. I also noted that the drop was much worse on one mag. He then asked if it was a 914, "yes" I stated. The problem surfaced on the first flight of the winter season. In the four years prior to this incident the problem never surfaced. However, the summer preceding this winter flight I installed an inter-cooler. As ambient temps drop the air becomes denser, and with this density change the engine gets leaner. It is the lean condition that causes the excess mag drop. The inter-cooler only served to exacerbate the situation, further cooling the inlet air. The 914 differs from the 912 on the arrangement of the mags. On the 914 the top plugs of all cylinders are connected one mag and the bottom plugs to the other mag. On the 912 it is my understanding that one mag is connected to two top plugs and two bottom plugs (opposing cylinders) with the other mag controlling the other two top and bottom plugs. The cylinder heads of both the 912 and 914 are such that only one of the two plugs per cylinder is optimized for ideal flame propagation/combustion (top I believe). Hence with the 914 when you isolate the top plugs via a mag drop you will note a greater mag drop than with the bottom circuit offline. With the 912 would see equal mag drops since two top plugs and two bottom plugs are taken offline with each mag, thus cancelling out the differences in the head design. With a lean mixture the drop is more pronounced. The fix, change the needle valve setting to enrich the mixture. Problem solved. Good luck with diagnosing the problem. Please keep us posted on your progress. Erich Trombley N28ET Classic Mono 914 Read this topic online here: http://forums.matronics.com/viewtopic.php?p=448373#448373 ________________________________ Message 2 _____________________________________ Time: 05:47:55 AM PST US Subject: Europa-List: Re: Rotax 912S mixture vs mag drop From: "rampil" Yes, and you might see the increased air density effect at Furnace Creek (L06) as well with a airfield altitude of -220 feet. (But probably not in summer, I've seen OATs in excess of 120F there). Keeping with the western paradigm, please allow me to share an aphorism taught in medical schools: "When you are in cabin without windows on the high plains of Colorado and you hear the massed hoof beats of a herd outside, your first thought should not be of Zebras!" Altered air mass and cylinder charge effects occur but I thought it relevant to point out that they are rarely the life safety issue of a faulty ignition system. Remember another great aphorism in the immortal (but probably apocryphal) words of Willy Sutton (1901-1980): That's where the money is!" -------- Ira N224XS Read this topic online here: http://forums.matronics.com/viewtopic.php?p=448375#448375 ________________________________ Message 3 _____________________________________ Time: 10:54:39 AM PST US Subject: Europa-List: Tri Gear Main Wheels From: "Kelvin Weston" Hi All Just fitted the Tri Gear main wheels to the main gear legs for the first time. However, the slotted main axle nut spins on so far that it is completely clear of the pre-drilled split pin hole. Picture attached. Anyone else have this problem? I assume the answer is to drill a new hole for the split pin but how easy will that be in the hardened steel axle. I have a pillar drill and some cobalt drills but have experienced problems with hardened steel before. Any advice on a solution? -------- Regards Kelv Weston Kit 497 kelv@kdweston.biz Read this topic online here: http://forums.matronics.com/viewtopic.php?p=448386#448386 Attachments: http://forums.matronics.com//files/axle_117.jpg ________________________________ Message 4 _____________________________________ Time: 11:15:29 AM PST US From: Richard Wheelwright Subject: Re: Europa-List: Tri Gear Main Wheels How about just adding another washer behind the nut Sent from my iPhone > On 30 Oct 2015, at 17:53, Kelvin Weston wrote: > > > Hi All > > Just fitted the Tri Gear main wheels to the main gear legs for the first time. > However, the slotted main axle nut spins on so far that it is completely clear of the pre-drilled split pin hole. Picture attached. > > Anyone else have this problem? > > I assume the answer is to drill a new hole for the split pin but how easy will that be in the hardened steel axle. > I have a pillar drill and some cobalt drills but have experienced problems with hardened steel before. > > Any advice on a solution? > > -------- > Regards > > Kelv Weston > Kit 497 > kelv@kdweston.biz > > > > > Read this topic online here: > > http://forums.matronics.com/viewtopic.php?p=448386#448386 > > > > > Attachments: > > http://forums.matronics.com//files/axle_117.jpg > > > > > > > ________________________________ Message 5 _____________________________________ Time: 12:07:17 PM PST US From: Steve Hagar Subject: Re: Europa-List: Tri Gear Main Wheels Make a spacer dude! -----Original Message----- >From: Kelvin Weston >Sent: Oct 30, 2015 10:53 AM >To: europa-list@matronics.com >Subject: Europa-List: Tri Gear Main Wheels > > >Hi All > >Just fitted the Tri Gear main wheels to the main gear legs for the first time. >However, the slotted main axle nut spins on so far that it is completely clear of the pre-drilled split pin hole. Picture attached. > >Anyone else have this problem? > >I assume the answer is to drill a new hole for the split pin but how easy will that be in the hardened steel axle. >I have a pillar drill and some cobalt drills but have experienced problems with hardened steel before. > >Any advice on a solution? > >-------- >Regards > >Kelv Weston >Kit 497 >kelv@kdweston.biz > > >Read this topic online here: > >http://forums.matronics.com/viewtopic.php?p=448386#448386 > > >Attachments: > >http://forums.matronics.com//files/axle_117.jpg > > ________________________________ Message 6 _____________________________________ Time: 01:34:27 PM PST US Subject: Re: Europa-List: Tri Gear Main Wheels From: Robert Borger Keiv, Go to ACS or one of the wheel/brake manufacturers (MATCO, etc.) and obtain suitable spacers. Blue skies & tailwinds, Bob Borger Europa XS Tri, Rotax 914, Airmaster C/S Prop (75 hrs). Little Toot Sport Biplane, Lycoming Thunderbolt AEIO-320 EXP 3705 Lynchburg Dr. Corinth, TX 76208-5331 Cel: 817-992-1117 rlborger@mac.com > On Oct 30, 2015, at 6:53 PM, Kelvin Weston wrote: > > > Hi All > > Just fitted the Tri Gear main wheels to the main gear legs for the first time. > However, the slotted main axle nut spins on so far that it is completely clear of the pre-drilled split pin hole. Picture attached. > > Anyone else have this problem? > > I assume the answer is to drill a new hole for the split pin but how easy will that be in the hardened steel axle. > I have a pillar drill and some cobalt drills but have experienced problems with hardened steel before. > > Any advice on a solution? > > -------- > Regards > > Kelv Weston > Kit 497 > kelv@kdweston.biz ________________________________ Message 7 _____________________________________ Time: 01:54:46 PM PST US Subject: Europa-List: Re: Tri Gear Main Wheels From: "Kelvin Weston" Hi Richard I did consider packing it out with washers but the newer nut design, with the integral flange, does not specify the use of any washers. I believe the integral flange of the nut is being used to stop the bearing grease seal rotating and I was a little concerned that this might not be achieved with a stack of washers. The MATCO procedure is to tighten the axle nut until the grease seal does not rotate, although Europa specify a torque value of 150 in lbs for the nut in the build manual. I will try a stack of washers or a spacer and see what happens. If I can achieve the stationary grease seal then it is certainly easier than drilling the axle. Thanks for the reply. -------- Regards Kelv Weston Kit 497 kelv@kdweston.biz Read this topic online here: http://forums.matronics.com/viewtopic.php?p=448392#448392 ________________________________ Message 8 _____________________________________ Time: 02:43:26 PM PST US Subject: Europa-List: Europa XS Simulation for Android. From: Steve Fly N914XS before? Now you can again as I've written the attached free simulator for it. https://play.google.com/store/apps/details?id=com.stevokeano.angrycanyon Using an NACA23012 airfoil with symmetrical stabs (Is the NACA23012 close to our wing?). No flaps yet... It's perhaps a little over powered, but fly's great once you get used to the mode 2 RC joysticks. Sorry, I cannot afford apple developer Kit at the moment so its only available FREE on Android. Please note NO permissions are needed on your Android device just hours of your time flying the plane! Tata, Steve Kean PPSEL03 N914XS https://play.google.com/store/apps/details?id=com.stevokeano.angrycanyon ________________________________ Message 9 _____________________________________ Time: 05:32:00 PM PST US Subject: Europa-List: Re: Europa XS Simulation for Android. From: "rampil" Hi Steve! The Apple development system is FREE. Xcode is a free download and is the IDE for iOS and OSX. What costs money is the ability to distribute your product via the App Store. Have fun! -------- Ira N224XS Read this topic online here: http://forums.matronics.com/viewtopic.php?p=448398#448398 ________________________________ Message 10 ____________________________________ Time: 06:07:18 PM PST US From: Wladimir Kummer Subject: Europa-List: BRS Hello, Do you know of any Europa with a BRS? Im considering installing one in my MotorGlider. Still have the fuse top not bonded so I figure would be a not so difficult mod. Any ideas? Best Wladimir Kit no. A193, XS Motorglider Joinville - SC - Brazil ________________________________ Message 11 ____________________________________ Time: 08:26:02 PM PST US From: Fred Klein Subject: Re: Europa-List: BRS > On Oct 30, 2015, at 6:06 PM, Wladimir Kummer wrote: > > Do you know of any Europa with a BRS? I=99m considering installing one in my MotorGlider. Still have the fuse top not bonded so I figure would be a not so difficult mod. > > Any ideas? I suggest a first step would be to contact Boris at BRS and spell out your desires. You may be familiar with the methods used to embed the harness in linear recesses and cover them w/ break-away FG surface skins in the Cirrus. I suspect those would be challenging to retrofit into the Europa pre-moulded fuselage; however, the extent to which that is necessary would depend upon C of G considerations. As an alternative, potentially, a hard point of sufficient strength could be established between the two doors which would minimize the necessary harness, but such calculations are way above my pay grade. Though I can only speculate, my hunch is that the weight of the installation would suck up all of your baggage allowance and a good portion of weight allocated for fuel. Consider also the fact that the BRS system is intended to save lives, not airframes, and few if any of the Cirrus aircraft which have descended beneath a chute ever fly again. Finally, consider the extent of the testing necessary for such a system to be deamed to be effective and reliableare you really prepared to go there? 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