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#11
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In article ,
Elliot Wilen wrote: Or generally, is there some reason that some jets are designed with gear doors that stay open, while others have doors that close after the gear are extended? Apart from what's already been mentioned I can add that the gear bay can contain things which you want to access during normal handling on the ground. On Draken for example the ground crew data entry panel is in the nose gear bay. That's why they open almost 180 deg. And speaking of air brakes, Gripen's front nose gear door doubles as one -- but only on the single seat version. -- Urban Fredriksson http://www.canit.se/%7Egriffon/ 1) What is happening will continue to happen 2) Consider the obvious seriously 3) Consider the consequences - Asimov's "Three Laws of Futurics", F&SF, Oct 74 |
#12
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The RA-5C's doors (nose and main) closed after gear extension.
The system was pretty nice in that on hydraulic failure all the gear would free-fall after manual release, since all of the gear extended to the rear (of course, the doors wouldn't close in this case). If I remember correctly, it was a PMCF check to drop the gear manually (the non-essential systems had hydraulic power removed when the the cockpit "hydraulic" switch was in "flight" position) and then switch to "land" position and retract them, just to verify operation. Don't know why North American went to the trouble of retracting them - might have had something to do with the airflow around the control surfaces, or reducing drag for single-engine operation. The main gear doors were pretty big - maybe they stood a chance of damage on landing - but the nose gear door? Frank "Elliot Wilen" wrote in message om... In another online forum, it has been claimed that on the F-18, F-14, F-4, and possibly F-8, A-7, A-6, and A-4, all the landing gear doors stay open when the gear are extended. While typically (or at least in most other military jets), some of the landing gear doors open only during extension/retraction, and are closed while the gear are extended. Can anyone comment on the extent to which this is true? If so, there's an obvious pattern of this characteristic appearing in fighter/attack jets which were originally designed for the Navy. Is this due to Navy "culture" or somehow related to a safety/reliability issue for carrier-based operation? Or generally, is there some reason that some jets are designed with gear doors that stay open, while others have doors that close after the gear are extended? (The only reasons I've seen that make sense are simplicity versus air drag and, in some cases, ground clearance.) Many thanks in advance. --Elliot Wilen |
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