{"id":13713,"date":"2016-12-08T17:04:43","date_gmt":"2016-12-08T16:04:43","guid":{"rendered":"https:\/\/www.dg-flugzeugbau.de\/en\/?page_id=13713"},"modified":"2016-12-08T17:04:43","modified_gmt":"2016-12-08T16:04:43","slug":"the-procedure-starting","status":"publish","type":"page","link":"https:\/\/www.dg-aviation.de\/en\/library\/the-procedure-starting","title":{"rendered":"The Procedure of Starting the Engine of a DG-800B \/ DG-808C"},"content":{"rendered":"
When driving your car, you\u0092ve come to expect it:
\nTurn the key \u0096 engine starts up, regardless of outside air temperature, humidity and density altitude.
\nUnfortunately, this cannot be realized quite as easily in our glider engines, even though we did give it a try. Specifically, there have been a few notable incidents of start up troubles leading to a complete failure of the drive belt.
\nThe following paragraphs are mean to capture accurately just what happens during the start up phase and we hope it will enable pilots to adjust their procedures to avoid troubles.
\nInstead of choke, glider engines use a primer, a valve that, when open, directly injects fuel into the air stream in the intake. The most primitive primers consist of a simple rubber ball. Our primers are electrical and controlled by the DG DEI engine control unit. The DEI uses the temperature of the engine coolant to control the primer. If the primer switch is on \u0093Auto\u0094, you don\u0092t have to do anything as two things happen sequentially:<\/p>\n
Both the primer fuel flow and the time window of post-start up primer operation can be preset by the pilot using the DEI. Of course, we deliver our gliders with an optimized setting for these parameters except\u0085<\/p>\n
….and this gets us back to the drive belt failures which are linked to the primer function. Virtually all of these incidents occurred in the US. Why?<\/p>\n
We were initially convinced that our drive belts were absolutely fail safe as they are designed for a failure load of 4 metric tons! Who or what might tear at the drive belt with more than 9,000 pounds? Our initial hypothesis was a materials defect. Further research ruled out this hypothesis and we went through extensive brainstorming sessions and pursued a few other theories that equally turned out to be dead-end streets.
\nOur current thinking is as follows:<\/p>\n
Prior research during the design phase of the engine had actually identified this problem and it seemed that a torque-limiting clutch would be the way to go. We designed it, built it, and tested it and in fact, we still offer it as an option. The testing however revealed that the torque-limiting clutch was showing signs of slippage after every single flight. At first, we thought this wouldn\u0092t be a problem:
\nSince there was no measurable reduction in power, we figured the device was working as intended \u0096 just reducing or avoiding peak loads on the drive belt. Soon enough, however, the clutches started to come apart. On problem had been replaced by another!
\nWhile we were unable to fully explain the failure of the torque-limiting clutch, it is clear that the addition of a heavy component to the drive train alters the resonance frequencies significantly.
\nOne thing, however, did become clear and now it is your turn:
\nThe drive belt only fails after the engine is operating in a seriously over-rich condition and then misfires. Such a combustion can have so much power that if it occurs before piston dead center, the engine is immediately yanked into reverse motion and the formerly slack side of the drive belt is pulled at and fails.
\nAnd with this we are back to the start up phase:
\nYou know that you should adjust the carburetor mixture to a leaner setting if you operate in high density altitude conditions. The adjustment of the main circuit is very easy and and can be accomplished by means of the adjustment bolt and this makes sure the engine receives a slightly leaner mixture at density altitudes above 1,700 ft MSL. However, the main circuit is not what is causing our problem here. The same goes for the idle mixture adjusting screw.
\nThe only device that controls the mixture during the start-up phase is the primer and who the heck adjusts the primer???
\nWell, people should adjust it because it is so easy. The maintenance manual for the DG-800B describes in paragraph 4.32.2 (page 82) how to adjust the primer. The standard factory settings for the primer are \u00938\u0094 for the fuel flow and \u00933\u0094 for the duration of post start-up operation of the primer. Do not adjust the duration of the post start-up operation of the primer, but do reduce the fuel flow to \u00936\u0094 or \u00937\u0094 when starting up the engine in a high density altitude environment.
\nFor the DG-808C such as the one I own it is captured in the flight manual: Paragraph 7.4.3, \u0093setup\u0094 on page 7.13 how to adjust the primer \u0093dosage\u0094.
\nThe standard setting is 99% – change it to 80% just to try it out!
\nThe result of our analysis is thus as follows:<\/p>\n
And why did the failures all occur in the US?
\nSimply because most of our DG powered gliders fly in the western regions of the United States. It is hot in Arizona and you are 5,000 ft MSL in Minden. Both are high density altitude situations requiring a leaner primer mixture. Of course the pilots didn\u0092t know better then. We hope that has changed now and encourage you to experiment!<\/p>\n
– friedel weber –
\nTranslation: Kai Talarek<\/p>\n","protected":false},"excerpt":{"rendered":"
When driving your car, you\u0092ve come to expect it: Turn the key \u0096 engine starts up, regardless of outside air temperature, humidity and density altitude. Unfortunately, this cannot be realized quite as easily in our glider engines, even though we did give it a try. Specifically, there have been a few notable incidents of start […]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":13414,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":"","_trash_the_other_posts":false,"editor_notices":[],"footnotes":""},"class_list":["post-13713","page","type-page","status-publish","hentry"],"rankMath":{"parentDomain":"dg-aviation.de","noFollowDomains":[],"noFollowExcludeDomains":[],"noFollowExternalLinks":false,"featuredImageNotice":"The featured image should be at least 200 by 200 pixels to be picked up by Facebook and other social media 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