ECU Programming Shouldn't Be Changed on Viking Engines - Zenith Aircraft Builders and Flyers2024-03-29T08:51:01Zhttps://zenith.aero/forum/topics/those-who-can-and-those-who-can-t?xg_source=msg_forum_disc&feed=yes&xn_auth=noI. An personally attest to th…tag:zenith.aero,2018-10-26:2606393:Comment:6512912018-10-26T03:19:04.231ZRandy & Theresa Cechinihttps://zenith.aero/profile/RandyCechini
<p>I. An personally attest to the programming change being the issue. Before his forst</p>
<p>flight I was contacted by the builder as I am in Colorado as well. Wanted to come by and take a look at my build (750 STOL Viking 110). When he was there he asked to hook up to the ECU and take a copy of the existing parameters. He had the right equipment to do so. I didn’t see an issue so I let him. After all this surfaced I of course was concerned that mine may have been corrupted by him. Did lots of…</p>
<p>I. An personally attest to the programming change being the issue. Before his forst</p>
<p>flight I was contacted by the builder as I am in Colorado as well. Wanted to come by and take a look at my build (750 STOL Viking 110). When he was there he asked to hook up to the ECU and take a copy of the existing parameters. He had the right equipment to do so. I didn’t see an issue so I let him. After all this surfaced I of course was concerned that mine may have been corrupted by him. Did lots of testing on the ground and it ran as silky smooth, cool and just damn mesmerizing as the day I first started it. I will be starting another build in the next year or so (750 HD) and the ONLY correct choice to me is the Viking. I am very interested (Drooling) over the larger turbo versions!!! Thanks Jan! Absolutely GREAT product!!!</p> The important thing is: Don'…tag:zenith.aero,2018-10-12:2606393:Comment:6491732018-10-12T01:03:39.337ZJan Eggenfellnerhttps://zenith.aero/profile/JanEggenfellner
<p>The important thing is: Don't make it smaller than standard for the first flight. I always make my first flights without a cowling. The engine does not need a cowling. The cowling is only there to increase airspeed and for looks. Tie everything down and fly without the cowling until all parameters are good. Then install the cowling and compart to the obtained parameters. Do the best you can to mimic the cooling that was available without the cowling, for the engine and gearbox. The…</p>
<p>The important thing is: Don't make it smaller than standard for the first flight. I always make my first flights without a cowling. The engine does not need a cowling. The cowling is only there to increase airspeed and for looks. Tie everything down and fly without the cowling until all parameters are good. Then install the cowling and compart to the obtained parameters. Do the best you can to mimic the cooling that was available without the cowling, for the engine and gearbox. The slight tapering towards the rear is not detrimental</p> John,
Very nice. Looks like…tag:zenith.aero,2018-10-11:2606393:Comment:6489282018-10-11T15:57:53.229ZLoren Warnerhttps://zenith.aero/profile/LorenWarner
<p>John,</p>
<p>Very nice. Looks like a good addition even if our louvers do work.</p>
<p>John,</p>
<p>Very nice. Looks like a good addition even if our louvers do work.</p> Loren,
Here's an alternative…tag:zenith.aero,2018-10-11:2606393:Comment:6489862018-10-11T12:26:40.018ZJohn Austinhttps://zenith.aero/profile/JohnLAustin
<p>Loren,</p>
<p>Here's an alternative way to prevent nose wheel debris from being thrown up - it not only would protect the radiator, it keeps the entire belly clean:</p>
<p><a href="http://storage.ning.com/topology/rest/1.0/file/get/2060785309?profile=original" target="_self"><img class="align-full" src="http://storage.ning.com/topology/rest/1.0/file/get/2060785309?profile=RESIZE_480x480" width="375"></img></a></p>
<p><a href="http://storage.ning.com/topology/rest/1.0/file/get/2171059377?profile=original" target="_self"><img class="align-full" src="http://storage.ning.com/topology/rest/1.0/file/get/2171059377?profile=RESIZE_480x480" width="375"></img></a></p>
<p>Trucker girl sticker is optional! …</p>
<p>Loren,</p>
<p>Here's an alternative way to prevent nose wheel debris from being thrown up - it not only would protect the radiator, it keeps the entire belly clean:</p>
<p><a href="http://storage.ning.com/topology/rest/1.0/file/get/2060785309?profile=original" target="_self"><img width="375" src="http://storage.ning.com/topology/rest/1.0/file/get/2060785309?profile=RESIZE_480x480" width="375" class="align-full"/></a></p>
<p><a href="http://storage.ning.com/topology/rest/1.0/file/get/2171059377?profile=original" target="_self"><img width="375" src="http://storage.ning.com/topology/rest/1.0/file/get/2171059377?profile=RESIZE_480x480" width="375" class="align-full"/></a></p>
<p>Trucker girl sticker is optional! ;>)</p>
<p>John</p>
<p>N750A</p> With regards to our Alaska 75…tag:zenith.aero,2018-10-11:2606393:Comment:6489802018-10-11T03:40:14.574ZLoren Warnerhttps://zenith.aero/profile/LorenWarner
<p>With regards to our Alaska 750 STOL, we recently found that enclosing the underside of the radiator did prove to be a problem, and have recently addressed the problem. Since we still want to protect the radiator from debris that may be tossed up from the nose wheel, we have replaced the full cover with louvers. We're waiting to test.</p>
<p>With regards to our Alaska 750 STOL, we recently found that enclosing the underside of the radiator did prove to be a problem, and have recently addressed the problem. Since we still want to protect the radiator from debris that may be tossed up from the nose wheel, we have replaced the full cover with louvers. We're waiting to test.</p> Yan,
The installation of the…tag:zenith.aero,2018-10-11:2606393:Comment:6490752018-10-11T00:54:31.057ZJonathan Fayhttps://zenith.aero/profile/JonathanFay
<p>Yan,</p>
<p>The installation of the radiator in the video liked on the Viking home page <a href="https://www.vikingaircraftengines.com/installation.html" target="_blank">https://www.vikingaircraftengines.com/installation.html</a> shows Garry Simmons installation and it has some clear narrowing from front to back. Not nearly what Colorado install picture has, but still narrowed. Is this example video wrong? Should we not be following it? I used that install video as the basis for my install,…</p>
<p>Yan,</p>
<p>The installation of the radiator in the video liked on the Viking home page <a href="https://www.vikingaircraftengines.com/installation.html" target="_blank">https://www.vikingaircraftengines.com/installation.html</a> shows Garry Simmons installation and it has some clear narrowing from front to back. Not nearly what Colorado install picture has, but still narrowed. Is this example video wrong? Should we not be following it? I used that install video as the basis for my install, I did ensure I had at least a 3" opening, but given the use of the rubber attach points in the video, the aft end narrows. The other video that Alissa pointed me to for the Alaska 750 STOL also has a narrowing and additionally he fully enclosed the exit air with only an outlet in the rear, is that going to be problematic for him?</p>
<p>I am going do double check my measurements be it would be good to get some clarifications on weather we should be following the advice of these two examples.</p>
<p></p>
<p>Thanks</p>
<p>Jonathan</p> Did some calculations on the…tag:zenith.aero,2018-10-11:2606393:Comment:6490702018-10-11T00:23:12.518ZJan Eggenfellnerhttps://zenith.aero/profile/JanEggenfellner
<p>Did some calculations on the reduced airflow,</p>
<p>Reduced air flow of 33% due to reduced opening size, then reduced air density in Colorado of almost 40% ( 12.25 kg/cu meter @SL vs 7.36 kg/ cu meter @ 5000 ft) resulting in a big decrease of air molecules flowing thru the radiator to cool the coolant.</p>
<p>Net air flow vs SL air flow with reduced opening size =.66(reduced opening) X (1-.40)(air density @5000ft)=.39 (61% less air molecules to cool the engine!!)</p>
<p>Then if you climb to…</p>
<p>Did some calculations on the reduced airflow,</p>
<p>Reduced air flow of 33% due to reduced opening size, then reduced air density in Colorado of almost 40% ( 12.25 kg/cu meter @SL vs 7.36 kg/ cu meter @ 5000 ft) resulting in a big decrease of air molecules flowing thru the radiator to cool the coolant.</p>
<p>Net air flow vs SL air flow with reduced opening size =.66(reduced opening) X (1-.40)(air density @5000ft)=.39 (61% less air molecules to cool the engine!!)</p>
<p>Then if you climb to 8000ft in Colorado (3000 ft AGL), cooling is reduced even further!</p>
<p>The 3” opening height is critical to maintaining air flow thru the radiator</p>
<p>Also, the height at the back of the radiator box should not taper down. There has to be enough room for the airflow to turn 90 degrees to pass thru the radiator. If there is a taper, it will choke the air flow thus reducing the air flow thru the radiator even further.</p>
<p>Moral to the story. Maintain a minimum of a 3” opening , no taper to the air box to achieve the required airflow thru the radiator (and required cooling) </p>
<p></p>
<p>The output of the engine also is reduced with altitude but not to the extent to cover up the above. </p> tag:zenith.aero,2018-10-11:2606393:Comment:6489792018-10-11T00:17:08.132ZJan Eggenfellnerhttps://zenith.aero/profile/JanEggenfellner
<p><iframe width="560" height="315" src="https://www.youtube.com/embed/ojJTlYH0sKs?wmode=opaque" frameborder="0" allowfullscreen=""></iframe>
</p>
<p><iframe width="560" height="315" src="https://www.youtube.com/embed/ojJTlYH0sKs?wmode=opaque" frameborder="0" allowfullscreen=""></iframe>
</p> NORMAL RADIATOR INSTALLATION …tag:zenith.aero,2018-10-10:2606393:Comment:6488772018-10-10T00:29:05.634ZJan Eggenfellnerhttps://zenith.aero/profile/JanEggenfellner
<p style="text-align: center;"><span style="font-size: 14pt;"><strong>NORMAL RADIATOR INSTALLATION </strong></span></p>
<p></p>
<p><a href="http://storage.ning.com/topology/rest/1.0/file/get/2171049932?profile=original" target="_self"><img class="align-full" src="http://storage.ning.com/topology/rest/1.0/file/get/2171049932?profile=RESIZE_1024x1024" width="721"></img></a></p>
<p>Normal radiator installation</p>
<p></p>
<p><a href="http://storage.ning.com/topology/rest/1.0/file/get/2171050674?profile=original" target="_self"><img class="align-full" src="http://storage.ning.com/topology/rest/1.0/file/get/2171050674?profile=RESIZE_1024x1024" width="721"></img></a></p>
<p>Normal radiator installation hardware stud…</p>
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<p style="text-align: center;"><span style="font-size: 14pt;"><strong>NORMAL RADIATOR INSTALLATION </strong></span></p>
<p></p>
<p><a href="http://storage.ning.com/topology/rest/1.0/file/get/2171049932?profile=original" target="_self"><img width="721" class="align-full" src="http://storage.ning.com/topology/rest/1.0/file/get/2171049932?profile=RESIZE_1024x1024"/></a></p>
<p>Normal radiator installation</p>
<p></p>
<p><a href="http://storage.ning.com/topology/rest/1.0/file/get/2171050674?profile=original" target="_self"><img width="721" class="align-full" src="http://storage.ning.com/topology/rest/1.0/file/get/2171050674?profile=RESIZE_1024x1024"/></a></p>
<p>Normal radiator installation hardware stud</p>
<p></p>
<p></p>
<p style="text-align: center;"><span style="font-size: 14pt;"><strong>CUSTOMER MODIFIED RADIATOR INSTALLATION</strong></span></p>
<p><a href="http://storage.ning.com/topology/rest/1.0/file/get/2171051676?profile=original" target="_self"><img width="721" class="align-full" src="http://storage.ning.com/topology/rest/1.0/file/get/2171051676?profile=RESIZE_1024x1024"/></a></p>
<p>Typical size of Zenith angle used to secure radiator baffle</p>
<p></p>
<p><a href="http://storage.ning.com/topology/rest/1.0/file/get/2171052440?profile=original" target="_self"><img width="721" class="align-full" src="http://storage.ning.com/topology/rest/1.0/file/get/2171052440?profile=RESIZE_1024x1024"/></a></p>
<p>Builder attempt to increase aircraft performance by reducing cooling air intake by about 1/3 of needed opening as tested by Viking Aircraft Engines. Aft portion of radiator airflow is 1/4 of original system</p>
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<p></p> I too wish we could learn mor…tag:zenith.aero,2018-09-10:2606393:Comment:6451502018-09-10T03:59:17.765Zcharlie rosenzweighttps://zenith.aero/profile/charlierosenzweig
I too wish we could learn more about the complete story. Truthfully no one has enough information on the cause of the off airport landing to have an informed opinion.
I too wish we could learn more about the complete story. Truthfully no one has enough information on the cause of the off airport landing to have an informed opinion.