facthunter Posted July 23, 2025 Posted July 23, 2025 Even IF you spent weeks on courses with out significant experience on motors you have no more than a bit of an idea how it should be done. Even LAME s muck some things up. Working on YOUR OWN Plane is a good idea as you are the one dependent on it but the job must still be 100% right. It's an AEROPLANE not a Lawnmower, and your LIFE depends on it working. IF you aren't SURE check with someone who knows. Nev 3
laserfly Posted January 21 Posted January 21 I attended line maintenance at floods Found the course well run and informative learnt a lot 2 1 1
BrendAn Posted January 22 Posted January 22 25 minutes ago, facthunter said: Not really a LOT in that. Nev Seriously if you don't like you don't need to say anything. Other people might enjoy it. 1
facthunter Posted January 22 Posted January 22 IF I'd been forewarned I wouldn't have wasted 33 Minutes.. Nev
sfGnome Posted January 23 Posted January 23 Well, I enjoyed it, but I’m not an expert so I guess it was aimed more at my level. 1
BrendAn Posted January 23 Posted January 23 2 minutes ago, sfGnome said: Well, I enjoyed it, but I’m not an expert so I guess it was aimed more at my level. I did to. 1
BurnieM Posted January 23 Posted January 23 Wish that english guy would stop talking, he does not know 50% of what he thinks he does. How you view Rotax aircraft engines depends on your background. I view the 912ULS as a 40 year old low revving motorcycle engine because my background is motorcycles. Those carbs are CV carbs and commonly used before injection. Not sure why they used water cooled heads with air cooled cylinders rather than watercooled heads AND cylinders. Not latest tech but very reliable. 1
Blueadventures Posted January 23 Author Posted January 23 2 hours ago, sfGnome said: Well, I enjoyed it, but I’m not an expert so I guess it was aimed more at my level. It was good in that it showed some of the gearbox parts and others (eg overload clutch and sprag clutch). Tried to insert a bit of humour which kind of distracted the flow. Nice to watch and could have been done better and shorter. At least it is out there in the video world of Rotax information. 1
Thruster88 Posted January 23 Posted January 23 4 hours ago, BurnieM said: Wish that english guy would stop talking, he does not know 50% of what he thinks he does. How you view Rotax aircraft engines depends on your background. I view the 912ULS as a 40 year old low revving motorcycle engine because my background is motorcycles. Those carbs are CV carbs and commonly used before injection. Not sure why they used water cooled heads with air cooled cylinders rather than watercooled heads AND cylinders. Not latest tech but very reliable. I think he admitted his knowledge of rotax 900 series was limited. His knowledge of all things Cessna is remarkable. Great channel for those that like all things GA. 3
CT9000 Posted January 23 Posted January 23 5 hours ago, BurnieM said: Wish that english guy would stop talking, he does not know 50% of what he thinks he does. How you view Rotax aircraft engines depends on your background. I view the 912ULS as a 40 year old low revving motorcycle engine because my background is motorcycles. Those carbs are CV carbs and commonly used before injection. Not sure why they used water cooled heads with air cooled cylinders rather than watercooled heads AND cylinders. Not latest tech but very reliable. The reason for water cooled heads and not cylinders is because most of the heat is generated in the head. 1
BurnieM Posted January 23 Posted January 23 It is unheard of for a motorcycle to have a watercooled head and not watercooled cylinder. I understand that the cylinder generates less heat but enclosing any engine in a cowling has always created its own cooling problems. It is an odd thing to do but perhaps it is cost based. 1
facthunter Posted January 23 Posted January 23 Rotec make watercooled heads for Jabiru's. Probably only for the earlier Versions. .Nev
BrendAn Posted January 24 Posted January 24 6 hours ago, facthunter said: Rotec make watercooled heads for Jabiru's. Probably only for the earlier Versions. .Nev Don't think they will fit a 912.😁 1
BrendAn Posted January 24 Posted January 24 18 hours ago, BurnieM said: It is unheard of for a motorcycle to have a watercooled head and not watercooled cylinder. I understand that the cylinder generates less heat but enclosing any engine in a cowling has always created its own cooling problems. It is an odd thing to do but perhaps it is cost based. You said yourself they are very reliable so air cooled cylinders obviously work fine. But the zonshen 912 has full water cooling so they might have seen that as an area for improvement. 1
CT9000 Posted January 24 Posted January 24 Or they plan to sell head gaskets, which the 912 does not have. Hence the fact that a 912 has never had a head gasket fault 1 2
facthunter Posted January 25 Posted January 25 The Head to cylinder joint is a problem to some extent with ALL engines whether it has a head gasket or Not. The RR Merlin blocks have the Head and block integral as did Most earlier Bugatti's. Diesels have a Larger number of head Bolts to cope with the High Pressures. Heat transfer must be considered and also variation of thermal rates of expansion of different Metals. Stress & Distortion. Nev 1
Siso Posted January 26 Posted January 26 Head gasket problem solved. https://en.wikipedia.org/wiki/Junkers_Jumo_205 1
onetrack Posted Tuesday at 03:43 AM Posted Tuesday at 03:43 AM And the poppet valve problem solved, too! I understand the reliability of the Junkers-Jumo 205 was quite good, once initial design problems were sorted. Any problems with the 205 were more likely related to the Germans inability to acquire numerous strategic metals that were critical for high performance engines. Add in the possibility that some Jumo 205's suffered from internal sabotage, and it would have been interesting to see where the 205 could have ended up with full access to all critical metals, design improvements, and overall materials improvements. The Rootes TS3 copied the Jumo 205 design with substantial success, but noise levels and emissions were always a problem. 1
facthunter Posted Tuesday at 05:14 AM Posted Tuesday at 05:14 AM Drive gears connecting the 2 shafts Have a Job to do as well. Not easy to work on. Nev. 1
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