King air From United States of America, joined May 1999, 107 posts, RR: 0 Reply 1, posted (13 years 4 months 1 week 6 days 17 hours ago) and read 976 times:
They were flattened on the bottom for ground clearance. This shape was found to actully increase air flow into the engine. If you were to stand next to one on a ramp you would see just how close they come to the ground. If the cowling was round it would scrape the ground on taxi way bumps and some landings.
FDXmech From United States of America, joined Mar 2000, 3251 posts, RR: 36 Reply 4, posted (13 years 4 months 1 week 6 days 12 hours ago) and read 931 times:
To increase ground clearance, the engine gearbox is mounted on the left side of the engine rather than the bottom of the engine. With the gearbox on the side of the engine they were able to produce an oval nacelle. The engine itself is round.
Southern From Australia, joined Jul 2000, 198 posts, RR: 0 Reply 5, posted (13 years 4 months 1 week 6 days 4 hours ago) and read 913 times:
it took me a while to find out too but when i was down on the tarmac the engines were very close to the ground, if they were round it would scrape against the ground when you land or are taxing as the wing would bounce
RayChuang From United States of America, joined Jun 2000, 7860 posts, RR: 5 Reply 8, posted (13 years 4 months 1 week 5 days 9 hours ago) and read 864 times:
However, you might want to note that the engine nacelle on the 733/734/735 are unique to that plane because of the gear design, which was almost identical to 731/732's. This was so it could accommodate the much wider fan blade of the CFM56 engine without causing ground clearance problems.
The 736/737NG/738/739 models lack this nacelle design, since the new wing and landing gear design on the Next-Generation 737 no longer requires the flattened bottom on the nacelle itself.
Spaceman From United States of America, joined Jul 2000, 534 posts, RR: 0 Reply 11, posted (13 years 4 months 1 week 5 days 9 hours ago) and read 857 times:
I think Boeing made a desigh flaw of making the 737 so short. It is litterally half as tall as other airplanes. To make it worst they have to make engines which are not round at the bottom so it won't scrape the ground. It makes look awkward and weird too.
Runway From United States of America, joined Jun 2005, 0 posts, RR: 0 Reply 12, posted (13 years 4 months 1 week 3 days 8 hours ago) and read 837 times:
The Boeing 737 has been one of the most sucessful commercial aircraft ever built. The first series were built with a low bypass engine that are by todays standards a little too noisy and less fuel efficient than newer ones.
The best way to solve this (problem), without designing a whole new a/c is to equip them with new engines, like CFM56, or V2500. These are high bypass engines that require a large fan for thrust, which in its self would fit under the wing, however some acc had to be repositioned inside the cowl, and the cowl cut to give it reasonable ground clearance.
AKelley728 From United States of America, joined Dec 1999, 2139 posts, RR: 6 Reply 13, posted (13 years 4 months 1 week 2 days 22 hours ago) and read 827 times:
There is no 'design flaw' in the 737 being so short. If you would've looked at the history of the 737 before making such a remark you would see that it's short for a reason.
When the 737 was designed it was built with rural airports in mind. Airports that wouldn't have alot of support equipment around. The 737 is short so that most everything is within easy reach of ground operators. I could go on and on, maybe a ramp rat can elaborate further?
FDXmech From United States of America, joined Mar 2000, 3251 posts, RR: 36 Reply 14, posted (13 years 4 months 1 week 2 days 20 hours ago) and read 816 times:
You would think FOD would be more prevalent in an engine so close to the ground as opposed to one higher up. But it has been my experience that the 737-300 had relatively few incidents of FOD ingestion as opposed to the MD80 which suffered frequently from fan damage. The MD80 is legendary for the main tires kicking FOD into the engine intakes. The 737 with its engines in front of the main gear isn't as susceptable.