but the engines have components that would present air resistance and drag.
may be insignificant to affect the overall flight characteristic ??
pardon my ignorant question, thanks.
COMAC C919
- Thread starter Deino
- Start date
may be insignificant to affect the overall flight characteristic ??
pardon my ignorant question, thanks.
An engine takes air that’s going slower in front of it and makes it go faster behind it. You can erase the drag contribution from that interaction because that drag is accounted for in the net thrust your engine provides.but the engines have components that would present air resistance and drag.
may be insignificant to affect the overall flight characteristic ??
pardon my ignorant question, thanks.
I should add,
I should add, there are effects on the overall flow field around the wings from the engine actively moving air from the front of the engine to the back, but you’re not going to be able to capture that with a static wind tunnel mode. This part of aerodynamic study requires either live testing or CFD modeling.
Technically it's more accurate to say that an engine burns liquid fuel (and incoming air) into a lot more air which has to be pushed out the rear of the engine.
When a liquid turns into a gas, it expands to occupy 1000x more volume.
I’m talking about this in the context of aerodynamic study here.
By the way, any news regarding its current production? what is the next aircraft and when will it be ready
Also, ... seems like delays again:
So far, the C919, China’s attempt to rival Airbus SE and Boeing Co, has completed only 34 certification tests out of 276 planned, Yang Zhenmei, a Civil Aviation Administration of China (CAAC) official, told reporters.
Reuters in September reported COMAC has found it harder to meet certification and production targets for the C919 amid tough U.S. export rules, according to three people with knowledge of the programme.
China Eastern Airlines Corp Ltd said in August it expected to receive its first C919 by the end of the year, but that would require the model to be certified.
COMAC is years behind its initial certification schedule and it did not take the C919 to China’s biggest air show in Zhuhai in September.
C919 Chief Designer Wu Guanghui last month recommended CAAC continue to focus on certification as a priority for next year and asked it to step up resources to help with the delivery and commercial operations of the plane.
Also, ... seems like delays again:
China regulator says more testing needed to certify C919 aircraft
BEIJING/SYDNEY (Reuters) - China’s aviation regulator said on Friday that there is still a huge amount of testing to be done for the home-grown narrowbody C919 aircraft to be certified, raising doubt over planemaker COMAC’s year-end target.So far, the C919, China’s attempt to rival Airbus SE and Boeing Co, has completed only 34 certification tests out of 276 planned, Yang Zhenmei, a Civil Aviation Administration of China (CAAC) official, told reporters.
Reuters in September reported COMAC has found it harder to meet certification and production targets for the C919 amid tough U.S. export rules, according to three people with knowledge of the programme.
China Eastern Airlines Corp Ltd said in August it expected to receive its first C919 by the end of the year, but that would require the model to be certified.
COMAC is years behind its initial certification schedule and it did not take the C919 to China’s biggest air show in Zhuhai in September.
C919 Chief Designer Wu Guanghui last month recommended CAAC continue to focus on certification as a priority for next year and asked it to step up resources to help with the delivery and commercial operations of the plane.
Is this a CAAC problem, or a COMAC deficiency? 34 out of 276 tests sounds like C919 is years away from certification.
This is shit. It means they are way behind schedule even without sanctions.