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Jaba Chat Abril 2002


Novedades del motor de 8 cilindros
Festival aereo de Narromine
Motores Jabiru 
J400 Demo


Welcome to another edition of Jaba Chat. Happy Easter to you all we hope you had a well earned rest and enjoyed yourselves what ever you did over the 4 days break.
We've got lots of exciting news concerning a few of our staff members, Airshows and lots more.
Natfly Narromine 2002 Fly In was on over the Easter break with a crew of Jabiru members attending again this year. So read on to find out what is going on with Jabiru.


The 8 cylinder engine is currently in our workshop for its second inspection. The process we follow is very similar to when an engine is overhauled, the engine is fully stripped down and the crankshaft & conrod are sent away for crack testing. All remaining parts are inspected and measured checking for wear, then modifications are made where necessary.
We are pleased to say that it has all checked out well and only a few cosmetic changes are required. As we are using a lot of proven parts from the 2200 and 3300 engines it has been a fairly trouble free run.
The way the 8 cylinder is progressing we are hoping to be able to release it for sale in the later part of this year. We will have more updates in each issue of this Newsletter just to keep you informed.

Narromine Airshow

Well it was on again the Natfly Narromine 2002, like a good wine it is improving with age as we begin the story of another successful airshow for Jabiru.
Myself, Phil, Ian Bent, Debbie, Sonya, Don, Doug, Mike and Alan from Camit all made the trip in our Jabiru's. Debbie, Sonya and Laila ( Debbie's Daughter) were my passengers. 
I must start by personally thanking all staff members who attended the airshow, their assistance is very much needed and appreciated over the Easter long weekend.
We encountered a few storms on the fist leg of our journey which opened up Sonya's eyes a bid as she saw lightening strikes coming from no where. We stopped at Goondaawindi to let the storm pass and then eventually got on our way again and arrived at Narromine in the early evening.
The bad weather on Thursday and Friday delayed some arrivals, but by mid Suturday the turnaout of Jabiru's quickly filled the paddock once again.
There was huge interest in our new J200 & J400 kit model - you had to be quick to catch them on the ground, as the demo flights were continuous all the weekend. It was a great way for peoples to trust in this aircraft's capability as they got  to see it fly with 4 passengers.
Engine interest was sparked as a result of our "J" Models being powered by the 6 cylinder engine, people were amazed at its performance as its performance as it powered along with 4 peoples on board.
Natfly always provides us with the opportunity to show our fellow Australian customers how strong we are in the Ultralight and General Aviation market. Our mission is to develop and enhance affordable flying, not only in Australia, but also around the world.
Phil and I would also like to thank all our Jabiru Customers for their continual support at Narromine each year, your presence is very much appreciated.
2002 is looking good with may more Airshows to come - So see you all there!

Happy Flying 



New Engines
Engine manuals give points and tips for early engines operation. The first 25 hour shuld be run using a "straight Oil" that is one that will promote "Bed in" of the engine. The first few hours should be carefully done with due care to a number of points ( see section 4.7 in Instruction and Maintenance Manual). Even though the engine has been given a "run in" sequence and ready for flight, the process is an ongoing one. Engine revs and power should be varied with special attention to CHT and Oil temperatures. The CHT drops noticeably as the engine frees up. Avoid long steep full power climbs, climb out at a slightly higher speed than normal. Circuit work is a good way of enhancing "bed in" engine components. Aircraft engine are required to perform at continual high power setting for substantial periods of time. Early use is therefore most important to ensure a long trouble free life.
Care should also be afforded to oil temp and pressure. Engine must use an oil cooler. Oil should operate between 70 - 90°C for best results. At low temperatures contaminates are not evaporated from oil satisfactorily. Cold oil is harder to reach wearing parts on initial start up, so use of multigrade in winter is a good idea. Turning the prop a number of times before start up is also worth considering. Possibly one of the most important factors to a new engines performance is the installation. If installed in a Jabiru it is all straight forward. In various other aircraft carefull consideration must be made to many areas especially cooling.

Head Torquing and Valve Clearance.
As the engine uses "solid lifters" periodic adjustments is necessary. We do find at times the result of poorly adjusted valves when overhauling engines. The opposite also applies on engines of high times (1000 hours) that have been subjected to correct maintenance and operational procedures. In these cases valves show no stem of face wear. Now for some "technical bits". The exhaust valve face to seat contact is responsible for up to 75% of all heat transfer. When poorly adjusted valves accumulate combustion deposits on the valve face, poor sealing results and the condition wil only deteriorate. 
This only gets worse to the point of perhaps a riding valve. Temperatures therefore sky rocket in this area causing valve face distortion and further bad sealing, abnormally high temperatures, ay least severe valve face distortion and eventual failure of the valve. Exhaust temperatures are normally around 1600 - 2000°F. With poor valve sealing and clearance this temperature greatly elevates. The end result can be valve failure and disintegration and forced landing. It is therefore vital that early adjustment/checking is undertaken on a new engine until the engine "settles in " and at each 50 hourly inspection. If an exhaust valve exhibits poor sealing it is best removed and corrected.
With the later engines 1000 hours are easily attained, maintained and operated correctly. The valves used are of top quality and usually show very little wear.

Engine Jotting
Engine reliability has always been one of our ever present and ongoing goals. Engines are now firmly established. At 1000 hours only minor work is usually required however the mandatory overhaul is undertaken. A number of changes have occurred to promote more reliability and power. The 2200 engine now currently runs around 84 hp at 3300 rpm, while the 6 cylinder averages an output of around 127 hp at 3300 rpm. While output has increased no compromise has been made to reliability or structural integrity.

Last Jaba Chat the "gremlins" gave our maintenance person Greg Jack in Healsville Victoria slightly altered phone numbers, correction is as follows:

                Home: 03 5962 5776
                Mobile: 041 1 212 237

As noted earlier regular maintenance especially with valve setting, head tensioning and correct oil is important. Some flying schools change oil every 25 hours. When overhauling, the internal condition of engine usually reflects this. Usual service every 50 hours require oil and filter change. Remember a 50 hour contains many items to check with both engine and airframe. Service notes are always available though the engine shop. The Jabiru Technical Manual outlines the full inspection notes.

Probably the most talked about problem is "my engine won't rev out of perform correctly". In the vast majority of cases the problem exist with incorrect tacho readings. Tacho's now sence on 2 tags behind the flywheel fear teeth. Simply using another tacho to cross reference and calibrate usually cures the problem of wrong indications. Tachos using the 2 tag system are set up in the factory before dispatch and are "spot on". There are many other areas that can affect RPM howeverthe next one is usually a different prop.

6 Cylinder Ignition Coils
It can happen that the pilots side ignition coil can become quite hot to the point of miss-firing, so a cure is to attach a small tube approximately 10 mm diameter from the end of the air duct and guided down to the coil. This small amount of air is all that's needed to keep the coil cooler and functioning. This depends on installation and cooling heat range within the cowl. Four cylinder engines have never exhibited this situation.

A point often overlooked is that the majority of engine cooling is obtained through the oil. Good cooler installation is therefore most important. Cylinder head cooling also plays a part in this equation. Cowling design uses incoming and exiting air to promote good cooling. Gaps in the cowl cooler elements wastes good air, ensure area uses all the incoming air effectively.

Hard Luck Stories
There have been a number of engine problems caused by loose oil hoses or detachment of the oil hose from the cooler. If maintenance is undertaken in this oil area, or an engine change occurs a double check before cowling up may be in order. Clamps should not be over tightened to squash hoses nor should they be loose enough for minimum clamping action which will allow oil overload when under pressure. A check should be made of fire sleeve condition and the lay of the hoses on the bottom cowl with reference to the muffler and exhaust pipes before attaching the top cowl. Usually a good idea to run the engine and inspect all areas before cowling up and flying.

        If you push the stick forward the hoses get bigger
            If you pull the stick back they get smaller
    If you keep pulling the stick back, then they get bigger again.
        Take off are optional, landing are mandatory!

Cheers for now,
Don Richter


We now have a J400 Factory Demonstrator which we have been using for Demo flights so that customers can see how the new model performs. If you would like a demo flight in the new J400 fell free to call in and see us here at the Jabiru factory and we can organize one for you. Factory tours are also available to visitors to the Bundaberg area, call in to see us at Airport Drive, Hinkler Airport, Bundaberg Queensland and one of the staff will be more than happy to show you around.


For More Information Contact:

Jabiru Chile
Via Naranja 4230 Vitacura
Tel: 56-9-826 5210
FAX: 56-2-219 2115
Internet: info@jabiru.cl

Send mail to christian.tannen@jabiru.cl with questions or comments about this web site.
Copyright © 2002 Jabiru Chile
Last modified: May 26, 2002