Twin hull flying boat designs

the ground effect could be helpful in taking off, once it develops enough speed & airlift it can rise above the ground effect limit of 150m (500ft)

And get high enough to launch Fritz X glider bombs from out of AAA range. I like the way you're thinking;)
 
I was thinking more of something like a double hull Do26. Using six rather than three engines it could lift a lot of fuel, than shut down the rear engines (or one rear and two front, whatever) and cruise for a lot of time on just half the engines to save fuel. it would have huge range a be a great airborne spotter/shadower to lead submarines.
But I guess a twin Kawanishi H6K might have the range for VLR Pacific missions.
The twin H8K on that Japanese magazine does seem too monstrous....
And a double Z501 Gabbiano with three engines would be cool...

I think you're mixing up Do-24 and Do-26. Do-24 was 3 engines in front of the wing. The Do-26 was a mailplane/ATL whatever with 2 pushers and 2 tractors over the wing. Double them up and you get the equivalent to the BV222 Wiking or the BV238 monstrosity.
 
I think you're mixing up Do-24 and Do-26. Do-24 was 3 engines in front of the wing. The Do-26 was a mailplane/ATL whatever with 2 pushers and 2 tractors over the wing. Double them up and you get the equivalent to the BV222 Wiking or the BV238 monstrosity.

I was actually thinking about the Do26 with an extra pair of engines. (ence the three front, three rear engines. It had diesels, so it was already a long range machine. It would not be as monstrous as the above mentioned creatures, thanks to a slender hull. and would be doable in 1940.
 
hmmm a do-24 double hull would be interesting with extended covering over the section in between and one of the engines centermounted, that would also provide the flow for the ground effect.
 
The plan was for a CANT Z511 to take off from France, refuel from a UBoat, drop some teams of combat frogmen with manned torpedoes from X flotilla MAS and have them mine ships in New York.
That way the NY Italians would be safe and could cheer from the riversides.:cool:

That just makes me feel disturbed.;)
 
I tend to think the drawbacks outweigh the benefits, but...what about a pair of very narrow hulls, on the P-82 model? For a long-range patrol/seaplane fighter?
 
I tend to think the drawbacks outweigh the benefits, but...what about a pair of very narrow hulls, on the P-82 model? For a long-range patrol/seaplane fighter?

A seaplane twin mustang, so to speak...
It would have to come from Macchi if Italian, and maybe from Supermarine, if British.
 
Wakarimas.

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The story so far...

1936 - Italian Navy issues request for a Very Long Range MPA. Savoia Marchetti tries to update its S55, but eventualy cooperates with CANT in producin a twin hull flying boat, essencialy a couple of Z501 hulls with the larger wing (enlarged further) and three engines of the Z508. The machine takes off with all its engines, to be able to lift its huge fuel load, then cruises with two engines. The Aircraft is called the SMZ101.
1938 - Fear of carrier fighter interception leads to a request for a Very long Range seaplane fighter to protect the SMZ101. Macchi tries an experimental double hull evolution of its M41 biplane seaplane fighter, then develops a monoplane version. A very elegant machine, with two slim hulls and powered by two Fiat A74 engines. Armed with four 12.7mm, the MC99 machine proves surprisingly fast and manouvrable.
1940/43 - The SMZ101bis, in service in small numbers, proves so succeful as a ASW aircraft that larger number of a "ter" version are introduced. The MC99 is extremly succeful in action against RN Fulmars and a bis version with DB601 engines is tried. in 1942 the final 995 version with DB605 engines enters production. The most curious version was a double seater (a bubble cockpit in each hull) night fighter with german radar.
A few SMZ101ter operated over the Atlantic in support of the italian submarine operations. They were extremely succeful and were regarded by the RN as posing a therat as serious as the LW Condors. Dornier tested an experimental German bigger equivalent, based on a double hull Do26 with six engines, but it remained a prototype.

macchi_m-41.jpg
 
It doesn't look that threatening.

The M-41 fighter has an heritage dating back to the Lohner L of 1915 and ending in it's ultimate expression, the Supermarine Sea Otter. Doubling the hull at least doubles the drag. As a monoplane, it would still rely on a number of drag-inducing struts which would restrict it's performance. Mario Castoldi recognized the limitations of the design when he designed the Schneider Trophy racers.

ZMZ101.jpg
 
It doesn't look that threatening.

The M-41 fighter has an heritage dating back to the Lohner L of 1915 and ending in it's ultimate expression, the Supermarine Sea Otter. Doubling the hull at least doubles the drag. As a monoplane, it would still rely on a number of drag-inducing struts which would restrict it's performance. Mario Castoldi recognized the limitations of the design when he designed the Schneider Trophy racers.

It would look threatning to a submarine or to a convoy. And it certanly looks cool on the thread. As usual, its great that you take the time to ilustrate other people sugestions.
In terms of drag and usable internal volume, I guess the engine naceles negate the "two slim hulls vs two floats+one fuselage" equation. But I like this better than the OTL Z506. (I still like the Fiat RS14 better, though)

p1.jpg
 
I think an interesting technology might-have-been was the Blackburn B.20 with retractable lower hull. The only problems would have been weight, complexity, and the facts that it was butt-ugly, designed and built by Blackburn, and powered by Vultures. But conceptually intriguing.
 
Ursinus Fighte Seaplane

I always thought that this was a very interesting seaplane design especially for world war one .
ursinus_03.jpg
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Retractable floats. The equivalent for a twin hull flying boat would be a retractable engine mount. To heavy to be worth the bother, I'm afraid...
 
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