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Author
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Topic: engine damage
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bjorn
Pilot
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posted 04-24- 05:23 AM
  
If on a radial engine, a cylinder is shot off (well, cyl head blown off or cyl holed or so,) what would the visuals from distance be? Any at all? Thin smoketrail? What can one guesstimate the power degrading to?A hole in the centre of the radial engine? Quite a lot of oil, I gather. Very short lifetime remaining due to lacking lubrication. How much power degrade until it fails? How long can one expect it to run? Am I completely lost in my speculations? I never had this fascination for engines that so many seem to share, so I'm a bit lost in this department.
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/Bjorn. _
/Bjorn. IP: Logged |
jedi
Pilot
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posted 04-24- 09:46 AM
An actual missing cylinder would cause an oil leak I would think. That would be a bluish or whitish smoke trail, and maybe an oily canopy a la the 109 model. You could also have an obProb of a fire. As for engine degradation, well, R2800 had, what, 18 cylinders, so 10% would be reasonable. Maybe a little bitty explosion visually. Hehe I guess you could make little tiny rockets that shoot out of the cowling  You could also change the fuel consumption so that the engine would only run for a few more minutes in this condition, or change the engineFuelSource to 'none to simulate a seizure. ------------------
--jedi-- IP: Logged |
Laika 801
Pilot
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posted 04-24- 04:50 PM
This slowly (?) turns into a science. All I know is that if you want single parts/sides of the engine damageable (nice word) you need more than one "hit-detector" objects for the "engine". And if I think about it, you could need this also for the tank, for the fuse, for the ailerons/elevators/rudder for the pilot, and for the wheels/gears (I.e. if the fuse gets hitīs near the pilot it might wound or kill the pilot, or if you hit the fuse/wings from the bottom you migh lost one or both gears etc.)
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Jaguar
Pilot
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posted 04-24- 05:18 PM
It dpends on what Cylinder you want to come off. If the bottom one comes off, then your screwed for oil. It would drain out really fast. If the top one came off, then You would retain the oil for a prolonged period of time. ala P-47's flying home with 1 cylinder shot off. Not sure what leaking oil looks like. I have always though it looked like a black smoke trail, but I have nothing to back this up.As for what the cylinder blowing off would look like, the forces in there is so great, you barely even see the cylinder fly off. There would just be a hole in the cowing all of a sudden  A fire would most likely start up because you still have the fuel/air mixture going through the intake manifold to the missing cylinder, and a live wire from the spark plug hanging out in the open, exposed to the mixture. At those voltages the spark would be really pretty I'm not sure about power degration, but I would hazard a guess that you would loose a little over 1/9th of the power (we are talking 9 cyl engines right?). Something I rember from Recip. enging shop that might interest you is that, on average, the actuall piston reaches 32Mph while moving in the cylinder. The stroke is less than a foot, so the forces in there are HUGE! (that was on a Lycoming O-320.... small 4 cyl engine used on cessna 172s. Just imagine how large the forces are in a big 9 Cyl. eng!) ------------------
Cheers!
Jaguar
The FS Hangar
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bjorn
Pilot
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posted 04-24- 05:48 PM
Laika, Fortunately I'm not going to model it that closely. It'd frankly be too much work, and probably CPY intensive too.Jag, it's actually 18 cyls (two rings of 9 behind each other.) Yeah, enormous forces for sure.
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/Bjorn.
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