File:Ailettes bristol pour fusée à eau.jpg
![File:Ailettes bristol pour fusée à eau.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/5/56/Ailettes_bristol_pour_fus%C3%A9e_%C3%A0_eau.jpg/407px-Ailettes_bristol_pour_fus%C3%A9e_%C3%A0_eau.jpg?20201122103256)
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Summary
[edit]DescriptionAilettes bristol pour fusée à eau.jpg |
Français : Exemple d'ailettes bristol posée sur une fusée à eau 0,5L à petit culot. Ces ailettes sont juste scotchées sur la bouteille. Leur rigidité est suffisante. La fabrication de fusées à eau dotées de telles ailettes d'empennage peut constituer la solution en milieu scolaire. |
Date | |
Source | Own work |
Author | Bernard de Go Mars |
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Annotations InfoField | This image is annotated: View the annotations at Commons |
On remarque ici le petit dé de mousse de polystyrène qui maintient écartées les deux faces de l'ailette.
Ces quatre ailettes ont été fixées ici au bas d'une fusée de 0,5L à petit culot ; il faut se souvenir, en effet, que la traînée de culot d'une fusée (et de toutes sortes de projectiles) est particulièrement forte. Réduire la surface du culot peut donc apparaître comme une nécessité (même si la plupart des fusées à eau sont des fusées imitatives,c.-à-d. qu'elles visent à ressembler aux vraies fusées, lesquelles présentent généralement de très forts culots).
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 10:32, 22 November 2020 | ![]() | 2,141 × 3,149 (912 KB) | Bernard de Go Mars (talk | contribs) | Uploaded own work with UploadWizard |
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Metadata
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Camera manufacturer | Panasonic |
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Camera model | DMC-TZ6 |
Exposure time | 1/30 sec (0.033333333333333) |
F-number | f/3.8 |
ISO speed rating | 125 |
Date and time of data generation | 11:09, 22 November 2020 |
Lens focal length | 7.9 mm |
Orientation | Normal |
Horizontal resolution | 180 dpi |
Vertical resolution | 180 dpi |
Software used | Ver.1.1 |
File change date and time | 11:09, 22 November 2020 |
Y and C positioning | Co-sited |
Exposure Program | Normal program |
Exif version | 2.21 |
Date and time of digitizing | 11:09, 22 November 2020 |
Meaning of each component |
|
Image compression mode | 2 |
APEX exposure bias | 0 |
Maximum land aperture | 3.44 APEX (f/3.29) |
Metering mode | Pattern |
Light source | Fine weather |
Flash | Flash did not fire, compulsory flash suppression |