Pre-1945 Martin flying boat projects

[Vahe Demirjian]

The Martin Model 141 has been discussed at the designation number 141 page, but I've come upon the following unbuilt Martin flying boat projects:

Martin 128: diesel powered 4 engine flying boat
Martin 134: 2 engine passenger flying boat
Martin 142: catamaran type flying boat for US Navy
Martin 147: 4 engine flying boat for US Navy
Martin 148: 4 engine flying boat for Pan Am
Martin 150: streamliner flying boat for Pan Am
Martin 152, 153, 154, 155: large flying boats for Pan Am
Martin 163: large 250,000 pound, 4 engine flying boat 1937

Does anyone have drawings or specs for these designs?

 

[hesham]

At First,

we have to merge those topics.

https://www.secretprojects.co.uk/threads/various-martin-commercial-flying-boat-and-airliner-projects.2346/

 

[hesham]

A more Info from the book; Martin Aircraft 1909-1960;

152 was 61000 1b flying boat
153 was 100000 1b transatlantic flying boat
154 was 54000 1b flying boat
155 was 55000 1b flying boat