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Anonz263x
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Why did Boeing design the 707 to have a shorter landing gear than the DC-8?

Thu Apr 01, 2021 8:47 am

Why wasnt the 707 designed with a taller landing gear like the DC-8, considering it how it competed with it, and it could have allowed future stretching of the 707 without mass redesign?
 
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SEPilot
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Re: Why did Boeing design the 707 to have a shorter landing gear than the DC-8?

Thu Apr 01, 2021 9:47 am

The question is backwards. It should be why did Douglas design the DC-8 with longer landing gear than the 707? The 707 came first. As for the 707, landing gear is heavy and expensive, and making it longer than necessary adds cost and reduces payload. But perhaps Douglas had the foresight to envision stretching the DC-8; it was comparitavely easy with the DC-8 but extremely difficult with the 707. But in the end it didn’t help; the 707 far outsold the DC-8. The DC-8 lasted longer, but that did not make much money for Douglas.
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SEU
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Re: Why did Boeing design the 707 to have a shorter landing gear than the DC-8?

Thu Apr 01, 2021 10:03 am

Ah the burning question of 2021 so far

I believe it could be something similar to the reason the 737-200 was so slow, due to ease of access and maintenance to the airframe.
 
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Polot
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Re: Why did Boeing design the 707 to have a shorter landing gear than the DC-8?

Thu Apr 01, 2021 11:07 am

If I had to speculate, Douglas may have made their gear longer to better match the heights of their previous commercial props, specifically the DC-6/7 (which of course needed the height for adequate prop clearance). Trying to keep ground handling and maneuvering characteristics between the DC-8 and their earlier planes similar was one of Douglas’s goals to ease pilot/airline transition to jets.


Boeing’s props were far less commercially successful, and the tanker was driving many design decisions.
 
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dlednicer
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Re: Why did Boeing design the 707 to have a shorter landing gear than the DC-8?

Sat Apr 03, 2021 10:33 pm

A Boeing old timer told me that they picked the height of the door sill above the ground on the 707 to match that of the DC-6.
 
FGITD
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Re: Why did Boeing design the 707 to have a shorter landing gear than the DC-8?

Sat Apr 03, 2021 10:59 pm

dlednicer wrote:
A Boeing old timer told me that they picked the height of the door sill above the ground on the 707 to match that of the DC-6.


If I had to venture any guess, this explanation would make more sense than most. 707 was already a huge technological leap for airlines. So having it at a height that their ground equipment already worked at would be a major bonus. As seen with the 380, airports and airlines aren't wildly fond of having to acquire new infrastructure for one specific type.
 
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NWAROOSTER
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Re: Why did Boeing design the 707 to have a shorter landing gear than the DC-8?

Sat Apr 03, 2021 11:01 pm

SEU wrote:
Ah the burning question of 2021 so far

I believe it could be something similar to the reason the 737-200 was so low, due to ease of access and maintenance to the airframe.


Boeing probably built the 737 closer to the ground as it was to be a DC-9 competitor and they both used the same power plant which was the JT8D. which was small enough to fit under the wing and yes it was easier to maintain under the wing. I do NOT think Boeing ever thought the 737 in various versions would still be built fifty years later. If Boeing did they would have started designing a replacement about the time they a 727 was to be replaced. They did not and are still cobbling together new versions of the 737 which came out as the 737-100 in about 1966 for Lufthansa and Malaysian Airlines. It shortly was stretched into the 737-200 and now being built as the 737 MAX. In my opinion, the 737 should have been replaced after the completion of the 737 NG.
Procrastination Is The Theft Of Time.......
 
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ikolkyo
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Re: Why did Boeing design the 707 to have a shorter landing gear than the DC-8?

Sun Apr 04, 2021 10:22 pm

NWAROOSTER wrote:
In my opinion, the 737 should have been replaced after the completion of the 737 NG


As we all are aware of, this WAS the plan.
 
LH707330
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Re: Why did Boeing design the 707 to have a shorter landing gear than the DC-8?

Mon Apr 05, 2021 3:35 am

I think there were two main drivers:
1. The 707 shared much in common with the tanker and they wanted them to use existing GSE and be lighter, hence the lower gear.
2. Timing: in 1952 when they launched the 367-80, the engine thrust and traffic made a 5Y fuselage with 100-120 seats a big plane. The first 707s were twice as heavy as their forebears. Douglas was able to watch what Boeing was doing and respond against a known quantity: they chose to go larger than the original 707 and by that time probably anticipated further engine growth. At that point it made sense to bake in enough for the stretch, but it hampered sales of the earlier short-body DC-8s that were heavier than their Boeing equivalents. Had DC stretched the 8 earlier (1962ish), the jet age could well have developed very differently.
 
aeromoe
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Re: Why did Boeing design the 707 to have a shorter landing gear than the DC-8?

Tue Apr 06, 2021 8:23 pm

NWAROOSTER wrote:
new versions of the 737 which came out as the 737-100 in about 1966 for Lufthansa and Malaysian Airlines.
It was not Malaysian Airlines...it was Malaysia-Singapore Airlines.
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744SPX
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Re: Why did Boeing design the 707 to have a shorter landing gear than the DC-8?

Wed Apr 07, 2021 5:07 am

The 707 gear is still significantly longer than the 737 gear, and it gave enough ground clearance to fit the CFM-56 without having to squish the nacelle and push it into the wing like the 737. Also, the 707 has a deeper lower fuselage than the 737 (or DC-8) which also contributes to its longer gear length than the 737.

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