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When Did LH 707-300Bs Lose The Ventral Fin?  
User currently offlineLH707330 From United States of America, joined Jun 2012, 827 posts, RR: 0
Posted (2 years 3 months 2 weeks 6 days 6 hours ago) and read 4894 times:

I've done a few photo searches, but can't find a conclusive answer to this question. I know they removed the ventral fins when they changed the flaps to the -300C standard, but does anybody know in which year this occurred? For example, l/n 333 was delivered as D-ABOS in 1962 with the fin, and was re-registered as D-ABOV a few years later. By the 1970s, the fin was gone. I'm building a model in the 1960s straight-cheatline scheme, and would like to make sure I get the fin/no-fin right.

10 replies: All unread, jump to last
 
User currently offlineAeroWesty From United States of America, joined Oct 2004, 20785 posts, RR: 62
Reply 1, posted (2 years 3 months 2 weeks 6 days 6 hours ago) and read 4835 times:

Have you seen these resources? Interesting reading:

Ultimate Boeing 707 Guide

The Boeing 707 ventral fin story



International Homo of Mystery
User currently offlineLH707330 From United States of America, joined Jun 2012, 827 posts, RR: 0
Reply 2, posted (2 years 3 months 2 weeks 6 days 5 hours ago) and read 4752 times:

Quoting AeroWesty (Reply 1):
Have you seen these resources?

Thanks, I've seen the first one, not the second. Did the -300C and -300B Adv mods take place before 1970?

[Edited 2012-08-08 22:48:39]

User currently offlinetimz From United States of America, joined Sep 1999, 6896 posts, RR: 7
Reply 3, posted (2 years 3 months 2 weeks 5 days 17 hours ago) and read 4199 times:

Just to clarify: if a 707 had a ventral fin, it kept it? The only ones that didn't have them were the ones that were built without them?

The 320B/Cs started being built without fins... maybe 1966?


User currently offlineADent From United States of America, joined Dec 2006, 1397 posts, RR: 2
Reply 4, posted (2 years 3 months 2 weeks 5 days 15 hours ago) and read 4008 times:

Not too many 707-330 in the photo database here. But all that you can see the tail clearly on show no ventral fin, but the oldest such photo is from the 70s.

You can see the small fin on the 707-230 photo from the 1961 and lot of 707-430 photos with the big fin - which kept it until at least 1977.


View Large View Medium
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Photo © Mel Lawrence


View Large View Medium
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Photo © Wolfgang Mendorf



User currently offlinetimz From United States of America, joined Sep 1999, 6896 posts, RR: 7
Reply 5, posted (2 years 3 months 2 weeks 5 days 15 hours ago) and read 3927 times:

No? 707-320Cs ever had fins, so that started around 1963.

User currently offlineskipness1E From United Kingdom, joined Aug 2007, 3297 posts, RR: 1
Reply 6, posted (2 years 3 months 2 weeks 5 days 13 hours ago) and read 3813 times:

Sorry, pedant hat on again. The B707 series is 320B and 320C, not 300B/C.
Pan Am, the launch customer got 321s, 322s for United, 323 for American, 324 for Continental etc etc. Hence 707 series is B707-120, B707-020 better known as the B720 and the B707-320.


User currently offlineViscount724 From Switzerland, joined Oct 2006, 25871 posts, RR: 22
Reply 7, posted (2 years 3 months 2 weeks 5 days 13 hours ago) and read 3703 times:

Quoting ADent (Reply 4):
You can see the small fin on the 707-230 photo from the 1961 and lot of 707-430 photos with the big fin - which kept it until at least 1977.

The first photo is a 720B (720-030B), not a 707-230. All 720s and 720Bs were built with the fairly narrow ventral fin.

The 707-420 series (R-R-Conways) kept the ventral fin permanently as far as I know. No 707-320Cs had the ventral fin and later production -320Bs had the ventral fin deleted as it wasn't needed due to changes to the wing, flaps, slats etc.


User currently offlineADent From United States of America, joined Dec 2006, 1397 posts, RR: 2
Reply 8, posted (2 years 3 months 2 weeks 5 days 12 hours ago) and read 3461 times:

Quoting skipness1E (Reply 6):
Sorry, pedant hat on again. The B707 series is 320B and 320C, not 300B/C

It looks like I copied the data on the one photo wrong. It is listed as 720-030B on the photo.


User currently offlineADent From United States of America, joined Dec 2006, 1397 posts, RR: 2
Reply 9, posted (2 years 3 months 2 weeks 5 days 12 hours ago) and read 3449 times:

Quoting Viscount724 (Reply 7):
The 707-420 series (R-R-Conways) kept the ventral fin permanently as far as I know.

The one on display at Hamburg has the ventral fin removed.

It apparently did have it while in service though - as there is a photo of one of its sister ships near the end still with the fin.


User currently offlineLH707330 From United States of America, joined Jun 2012, 827 posts, RR: 0
Reply 10, posted (2 years 3 months 2 weeks 4 days 19 hours ago) and read 3242 times:

Quoting Viscount724 (Reply 7):
No 707-320Cs had the ventral fin and later production -320Bs had the ventral fin deleted as it wasn't needed due to changes to the wing, flaps, slats etc.

Do you know in what time frame the fin was deleted?


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