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2. Blackburn B-20 - Wikipedia

   en.wikipedia.org/wiki/Blackburn_B-20

   The Blackburn B-20 was an experimental aircraft, first flying in 1940, that attempted to drastically increase the performance of flying boat designs. Blackburn Aircraft undertook an independent design study based on a patent filed by their chief designer, John Douglas Rennie [1] for a retractable pontoon float that formed the planing hull.

3. Grumman Gulfstream II - Wikipedia

   en.wikipedia.org/wiki/Grumman_Gulfstream_II

   A highly modified GII used to flight test systems hardware for the Broad Area Maritime Surveillance (BAMS) UAV contract bid, seen here taxiing at Mojave. The Gulfstream II (G-II) is an American twin engine business jet designed and first built by Grumman, then Grumman American and finally Gulfstream American.

4. Cirrus SR20 - Wikipedia

   en.wikipedia.org/wiki/Cirrus_SR20

   In 2004, Cirrus introduced the SR20 G2 (Generation 2) and in 2008, the SR20 G3 (Generation 3). Both were defined by airframe modifications, G2 by fuselage and G3 by wing/landing gear changes. In 2012, "60/40 flex seating" was introduced, allowing up to three passengers in the rear with a split fold-down seat arrangement.

5. Stabilizer (ship) - Wikipedia

   en.wikipedia.org/wiki/Stabilizer_(ship)

   Diagram of retractable fin stabilizers on a ship. Ship stabilizers: a fixed fin stabilizer (foreground centre) and bilge keels (left background). Ship stabilizers (or stabilisers) are fins or rotors mounted beneath the waterline and emerging laterally from the hull to reduce a ship's roll due to wind or waves.

6. List of flying boats and floatplanes - Wikipedia

   en.wikipedia.org/wiki/List_of_flying_boats_and...

   A small number of seaplanes have retractable beaching gear, which is not capable of being used for landings and takeoffs, but these remain flying boats or floatplanes and are not amphibians. Many floatplanes, especially those since 1945, can have either conventional floats for operating just from water, or amphibious floats, which have ...

7. Azimuth thruster - Wikipedia

   en.wikipedia.org/wiki/Azimuth_thruster

   Retractable thrusters are used as auxiliary propulsion for dynamically positioned vessels and take-home propulsion for military vessels. Underwater-mountable thrusters are used as dynamic positioning propulsion for very large vessels such as semi-submersible drilling rigs and drillships .