Latécoère flying boats

Hi! Latécoère 520 and 523. There are three 523 types named l'Algol, l'Aldébaran and l'Altair? Radiator design were different,too?

http://picssr.com/tags/latecoere/page4
https://www.the-blueprints.com/blueprints/modernplanes/modern-l/30741/view/latecoere_523/
http://www.seawings.co.uk/Late523plansgal.htm
http://www.airwar.ru/enc/flyboat/late523.html
http://www.master194.com/forum/viewtopic.php?f=16&t=7236&start=0

https://en.wikipedia.org/wiki/Lat%C3%A9co%C3%A8re_521

"520 The initial design of the 520 series, powered by 4 × 1,000 hp (750 kW) Hispano-Suiza 18Sbr W-18 engines in tandem pairs."

"523 Three armed maritime patrol aircraft named l'Algol, l'Aldébaran and l'Altair, operated by Vichy French forces."

Hi! 521.
https://www.youtube.com/watch?v=qKJQtnUulDo

https://hiveminer.com/Tags/aircraft%2Clatecoere/Timeline

http://socks-studio.com/2013/11/30/flying-boats-2-latecoere-521-lieutenant-de-vasseau-paris/

http://www.amicale-aixoise.com/images/hydravions/

Hi! Latécoère 300 series.

https://en.wikipedia.org/wiki/Lat%C3%A9co%C3%A8re_300

Laté 300 : Mailplane with Hispano-Suiza 12Nbr engines, one built.

Laté 301 : Mailplane with Hispano-Suiza 12Nbr engines, three built.

Laté 302 : Maritime reconnaissance aircraft with Hispano-Suiza 12Ydrs engines, three built.

http://all-aero.com/index.php/contactus/5898-latecoere-late-300-late-301-late-302
"The Latécoère 300.01 was the company’s first four-engined flying-boat and flew originally in 1931, but sank in the Etang de Berre, near Marseilles, later that year. When salvaged it was re-built and named Croix du Sud (First flight 7 October 1932) with four 650 hp / 484.4kW Hispano-Suiza 12NBr water-cooled engines in tandem pairs. On 31 December 1933 Croix du Sud set up a new international class record by flying the 2,285 miles (3,679 km) from Berre to St Louis (Senegal) in just under 24 hours.
It operated the Air France South Atlantic mail service between Dakar, Senegal and Natal, Brazil. It completed 23 missions before being lost at sea on December 7, 1936. The pilot was the famous French aviator Jean Mermoz.

Three improved Latécoère 301 aircraft with 485-kW (650-hp) Hispano-Suiza l2Nbr engines were built during 1935-6, incorporating changes made to the Late 300 in 1935, including increased wing dihedral and enlarged tail surfaces. The all-metal two-step hull accommodated a four-man crew with sleeping accommodation, mail load and most of the fuel.

The first of the 301s was lost, the remaining two were used in South Atlantic service until 1939. In 1939 the last remaining 301 was converted to military service, joining the 302s in patrol duties in West Africa.

The basic type’s long-range performance attracted the attention of the French Navy, and in 1936 the French naval air service received three examples of the Latecoere 302, a fully navalised version of the Latécoère 301, with 930-hp / 693kW Hispano-Suiza 12Ydrs engines, between 1935 and 1936. They had machine-gun posts in bow and two beam positions, as well as two in the engine nacelles. Bomb load was 300kg. The aircraft supported a crew of four and included sleeping accommodations. Fuel and payload were stored inside the hull.

Late 302 equipped Escadrille E4 at Berre, joined by the last civil but militarised Late 301 in August 1939. These were operated in the patrol role, operating from West Africa together with a single navalised Latécoère 301 until scrapped in 1941."

Picture source.
https://www.pinterest.co.uk/pin/434738170258876469/?lp=true
https://aerofred.com/details.php?image_id=87211
http://www.lesitevideo.net/cat/late300/


What was Latécoère 300M?
302's nose shape was interesting.

https://www.youtube.com/watch?v=J4zl60v4j4U

Hi! 302 model.
http://ttsuji.xsrv.jp/FR_O_Latecoere302.html

"At first, 302 had two turret in the main wing, but the air flow became unstable when the turret was put out, so this turret ended up being removed."

https://picclick.co.uk/1930s-France-Latecoere-302-Flying-Boat-Unused-Military-201802280412.html
Perhaps finally 302 had two turret middle of the engine nacelle. It's very hard for me to imagine nose shape exactly.

Hi! Latécoère 30.(I think so based on Latécoère Les avions et hydravions, DOCAVIA 34, page 109)

This site is about Latécoère 300. But three side view is Latécoère 30.
http://www.airwar.ru/enc/flyboat/late300.html

Latécoère 300 three side view source.
http://oscarbyalpinestars.blogspot.jp/2009/07/

Latecoere 521 and 523 had different shape radiator.