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Author Topic: Ambrosini (Sergio Steffanuti) Pre-War Projects and Prototypes  (Read 22676 times)

Offline Maveric

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Ambrosini (Sergio Steffanuti) Pre-War Projects and Prototypes
« on: November 09, 2007, 05:28:12 am »
Hi all,

we all know Sergio Steffanutti for his aircraft S.S.3 and S.S.4, but there must be also a S.S.1 and S.S.2. Do you have some informations about this aircraft/projects? Who knows a short biography of Sergio Steffanutti? ???

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Offline hesham

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Re: Ambrosini (Sergio Steffanuti) Pre-War Projects and Prototypes
« Reply #1 on: November 09, 2007, 11:49:57 am »
Hi Maveric,

for SS.1 and SS.2 ,a small info about them on;
http://en.wikipedia.org/wiki/Ambrosini_SS.4

Offline Apophenia

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Re: Ambrosini (Sergio Steffanuti) Pre-War Projects and Prototypes
« Reply #2 on: November 09, 2007, 12:27:15 pm »
Maveric,

Attached is an SS.2 model by Giampaolo Sellitto (and fully deserving the name "Anitra"!).
original: http://www.cmtonline.it/XV_Mostra_Images/0333.JPG

For SS.2 drawing and colour profile, see: Aerofan No.45 1989/5-6 "First Canard of Stefanutti" .

You might also try No.36 1987/4 "The Ambrosini-Stefanutti Family of Aircraft", and
No.51/52 1991/1 "The Second Stefanutti Canard".

Not sure about the SS.1

Online Sundog

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Re: Ambrosini (Sergio Steffanuti) Pre-War Projects and Prototypes
« Reply #3 on: December 05, 2009, 09:20:43 pm »
With all of the talk on the XP-55, I was wondering if anyone had more information on the Ambrossini (SAI) S.S.4? I always thought it was a really nice looking canard fighter.

Also, when I say more info, I mean with regards to any possible existing detail drawings and the like. There is enough info on the net about it's very short lived history. ;)
« Last Edit: December 05, 2009, 09:24:10 pm by Sundog »

Offline CAO 700

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Re: Ambrosini (Sergio Steffanuti) Pre-War Projects and Prototypes
« Reply #4 on: December 06, 2009, 04:43:21 am »
Really a nice aircraft. Some pictures:









Offline Bailey

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Re: Ambrosini (Sergio Steffanuti) Pre-War Projects and Prototypes
« Reply #5 on: December 06, 2009, 05:41:27 am »
Three view of said aircraft.

Regards Bailey
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Offline Justo Miranda

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Re: Ambrosini (Sergio Steffanuti) Pre-War Projects and Prototypes
« Reply #6 on: December 06, 2009, 07:33:43 am »
Additional info

Offline AeroFranz

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Re: Ambrosini (Sergio Steffanuti) Pre-War Projects and Prototypes
« Reply #7 on: December 06, 2009, 08:13:37 am »
A few more details from volume 2 of "Dimensione cielo"

Armament was supposed to be 2x20mm and 1x30mm cannons
fuel tanks between pilot and engine and in inner wing panels

The SS.2 motorglider testbeds (there were 2, built at Guidonia in 1935) were powered by a 16CV Keller two cylinder engine.
In 1937, one of the airframes was modified with the addition of a second seat (becoming the SS.3) and a 38 CV C.N.A. engine (initially rated at 26CV). The SS.3 was flown extensively and made cross-country flight between Rome and Milan.
The SS.4 crashed on March 8, 1939. The loss of the aileron was due to vibrations transmitted from the engine, which was bolted directly on the airframe, as well as to defective installation of the said part.
All modern aircraft have four dimensions: span, length, height and politics.   TSR.2 got the first three right - Sir Sydney Camm

Offline redstar72

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Re: Ambrosini (Sergio Steffanuti) Pre-War Projects and Prototypes
« Reply #8 on: April 20, 2012, 02:35:15 pm »
Drawing from L+K 17/1995, by Martin Salajka:
Best regards,
Alexander

Offline Maveric

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Re: Ambrosini (Sergio Steffanuti) Pre-War Projects and Prototypes
« Reply #9 on: April 20, 2012, 11:38:44 pm »
I have pics from the S.S.2 and S.S.3, but without other informations. Can anybody tell us more about other Steffanutti aircraft? Was the S.S.4 the last S.S.-design? What´s about the S.S.1...
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Offline Justo Miranda

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Re: Ambrosini (Sergio Steffanuti) Pre-War Projects and Prototypes
« Reply #10 on: April 21, 2012, 06:36:34 am »
S.S.2 and S.S.3 info here...sorry no drawings  :-\

Offline Justo Miranda

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Re: Ambrosini (Sergio Steffanuti) Pre-War Projects and Prototypes
« Reply #11 on: April 21, 2012, 06:51:02 am »
S.7

Offline Justo Miranda

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Re: Ambrosini (Sergio Steffanuti) Pre-War Projects and Prototypes
« Reply #12 on: April 21, 2012, 07:01:25 am »
S.7 "Freccia"
« Last Edit: April 21, 2012, 09:40:24 am by Justo Miranda »

Offline Justo Miranda

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Re: Ambrosini (Sergio Steffanuti) Pre-War Projects and Prototypes
« Reply #13 on: April 21, 2012, 07:05:44 am »
Freccia -Marboré

Offline Justo Miranda

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Re: Ambrosini (Sergio Steffanuti) Pre-War Projects and Prototypes
« Reply #14 on: April 21, 2012, 07:28:50 am »
S.A.I. 7

Offline Justo Miranda

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Re: Ambrosini (Sergio Steffanuti) Pre-War Projects and Prototypes
« Reply #15 on: April 21, 2012, 07:33:59 am »
S.A.I.10

Offline Justo Miranda

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Re: Ambrosini (Sergio Steffanuti) Pre-War Projects and Prototypes
« Reply #16 on: April 21, 2012, 08:34:47 am »
S.A.I. 107 (Fighter)

Offline Justo Miranda

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Re: Ambrosini (Sergio Steffanuti) Pre-War Projects and Prototypes
« Reply #17 on: April 21, 2012, 08:49:38 am »
S.A.I. 107 (Racer)

Offline Justo Miranda

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Re: Ambrosini (Sergio Steffanuti) Pre-War Projects and Prototypes
« Reply #18 on: April 21, 2012, 09:15:02 am »
S.A.I.207

Offline Justo Miranda

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Re: Ambrosini (Sergio Steffanuti) Pre-War Projects and Prototypes
« Reply #19 on: April 21, 2012, 09:37:16 am »
S.A.I.403

Offline Justo Miranda

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Re: Ambrosini (Sergio Steffanuti) Pre-War Projects and Prototypes
« Reply #20 on: April 21, 2012, 09:43:18 am »
S.A.I.404

Offline Maveric

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Re: Ambrosini (Sergio Steffanuti) Pre-War Projects and Prototypes
« Reply #21 on: April 21, 2012, 10:16:11 am »
Justo, fantastic...
...you are my HERO ;)
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Offline Skyblazer

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Re: Ambrosini (Sergio Steffanuti) Pre-War Projects and Prototypes
« Reply #22 on: April 21, 2012, 10:48:05 am »
Thanks Justo, I know so little about Italian aircraft, and some of these are just fantastic designs!!!

Offline Justo Miranda

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Re: Ambrosini (Sergio Steffanuti) Pre-War Projects and Prototypes
« Reply #23 on: April 21, 2012, 11:05:55 am »
Thanks

Offline AeroFranz

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Re: Ambrosini (Sergio Steffanuti) Pre-War Projects and Prototypes
« Reply #24 on: April 21, 2012, 03:04:45 pm »
This is AWESOME material, and once again, Thanks Justo. However  I suggest we rename the thread to include all Stefanutti's projects  :)
All modern aircraft have four dimensions: span, length, height and politics.   TSR.2 got the first three right - Sir Sydney Camm

Offline hesham

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Re: Ambrosini (Sergio Steffanuti) Pre-War Projects and Prototypes
« Reply #25 on: April 21, 2012, 03:07:21 pm »
S.A.I.404


But we know that,


SAI-404 was a bomber ?,and this aircraft may be,SAI-503 improved version
of SAI-403.

Offline XP67_Moonbat

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Re: Ambrosini (Sergio Steffanuti) Pre-War Projects and Prototypes
« Reply #26 on: April 21, 2012, 03:32:20 pm »
Wow! That looks like something outta DUCK TALES!
In God we trust, all others we monitor. :-p

Offline Justo Miranda

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Re: Ambrosini (Sergio Steffanuti) Pre-War Projects and Prototypes
« Reply #27 on: April 21, 2012, 07:27:50 pm »
 :)

Offline redstar72

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Re: Ambrosini (Sergio Steffanuti) Pre-War Projects and Prototypes
« Reply #28 on: April 21, 2012, 10:32:46 pm »
A bit more on SAI-207:
Best regards,
Alexander

Offline Maveric

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Re: Ambrosini (Sergio Steffanuti) Pre-War Projects and Prototypes
« Reply #29 on: April 22, 2012, 12:39:25 am »
Good question hesham... :(
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Offline robunos

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Re: Ambrosini (Sergio Steffanuti) Pre-War Projects and Prototypes
« Reply #30 on: April 22, 2012, 01:17:05 am »
Quote
Wow! That looks like something outta DUCK TALES!


Moonbat, plz........................................................... ;)   ::)   ;D


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Offline Jemiba

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Re: Ambrosini (Sergio Steffanuti) Pre-War Projects and Prototypes
« Reply #31 on: April 22, 2012, 01:37:07 am »
Folks, thanks for your contributions, but please, it would be quite good, to stay with
the
original question and if straying OT, at least to stay with the appropriate section .
I think, I'll clean up a little bit merge this and maybe some other topics to a general
"Ambrosini pre-war types and projets" thread and move the Vindex to the existing thread
in
the post-war section.
« Last Edit: April 23, 2012, 09:03:52 pm by Jemiba »
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Offline Grey Havoc

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Re: Ambrosini (Sergio Steffanuti) Pre-War Projects and Prototypes
« Reply #32 on: April 22, 2012, 02:06:16 am »
S.A.I.404


But we know that,


SAI-404 was a bomber ?,and this aircraft may be,SAI-503 improved version
of SAI-403.

Was the SAI-404 meant to be for the Maritime Reconnaissance & Torpedo Bomber roles, perhaps?
(You can answer this once the thread carve up has taken place.)
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Offline hesham

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Re: Ambrosini (Sergio Steffanuti) Pre-War Projects and Prototypes
« Reply #33 on: April 23, 2012, 03:01:00 pm »
Hi Grey;


the SAI-404 was a proposal in the Regia Aeronautica 1938 competition
for Long Range Bomber;


http://www.secretprojects.co.uk/forum/index.php/topic,236.msg1659.html#msg1659

Offline hesham

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Re: Ambrosini (Sergio Steffanuti) Pre-War Projects and Prototypes
« Reply #34 on: April 23, 2012, 04:46:55 pm »
Also Ambrosini projects;

Ambrosini SAI.8 :reconnaissance flying boat. 
    ,,          SAI.9 :reconnaissance bomber.

Offline Apophenia

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Re: Ambrosini (Sergio Steffanuti) Pre-War Projects and Prototypes
« Reply #35 on: April 23, 2012, 07:19:30 pm »
But we know that, SAI-404 was a bomber ?,and this aircraft may be,SAI-503 improved version
of SAI-403.

This stuff does get confusing. Skybolt said elsewhere that "The [SAI] 504 was an evolution of the 404a, which was an evolution ot the 404."
http://www.secretprojects.co.uk/forum/index.php/topic,7835.msg68757.html#msg68757

We can probably assume that by late 1942, SAI Ambrosini felt safe in 'recycling' the 404 designation from a failed 1938 proposal. So, the second SAI.404 concept was an enlarged variantion on the Dardo theme (with Bf 109 influence) powered by an Isotta-Fraschini Zeta.

But what was the SAI.404a? Further confusion springs from planned construction methods. Is it true that the Zeta-powered SAI.504 was to be of wooden construction? Does the Bf 109 influence mean that  the SAI.404 to have been of all-metal construction? Or are all of those construction material notes confusing matters with the SAI.503, a Zeta-powered, wooden outgrowth of the SAI.403?  :o

Offline Maveric

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Re: Ambrosini (Sergio Steffanuti) Pre-War Projects and Prototypes
« Reply #36 on: April 24, 2012, 11:46:33 am »
Any drawing for the S.A.I.503 :o
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Offline Nico

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Re: Ambrosini (Sergio Steffanuti) Pre-War Projects and Prototypes
« Reply #37 on: May 29, 2012, 04:54:09 am »
...coming back to the SS.1 problem, none really knows what it was. Someone think that the SS.1 (for Sergio Stefanutti 1) was the subject of the degree thesis of the young engineer; according to others, the SS.1 was a scale flying model of the SS.2.
Nico

Offline hesham

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Re: Ambrosini (Sergio Steffanuti) Pre-War Projects and Prototypes
« Reply #38 on: March 21, 2013, 06:34:04 am »
Also Ambrosini projects;

Ambrosini SAI.8 :reconnaissance flying boat. 
    ,,          SAI.9 :reconnaissance bomber.


Amrosini SAI.9 was a twin engined overland observation aircraft project.


http://www.aeronautica.difesa.it/storiaTradizione/ufficioStorico/Documents/documenti/Direzione%20Costruzioni%20Aeronautiche.pdf

Offline hesham

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Re: Ambrosini (Sergio Steffanuti) Pre-War Projects and Prototypes
« Reply #39 on: April 20, 2013, 05:55:49 am »
Hi,


the SS.2 and the SS.3.

Offline topspeed3

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Re: Ambrosini (Sergio Steffanuti) Pre-War Projects and Prototypes
« Reply #40 on: April 25, 2013, 11:30:51 pm »
http://max3fan.blogspot.com/

http://mesoslaunch.blogspot.fi/

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Offline roadrunner2

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Re: Ambrosini (Sergio Steffanuti) Pre-War Projects and Prototypes
« Reply #41 on: June 20, 2014, 12:44:17 am »
I find a drawing of the SS2:



some where here
www.baronerosso.it/forum/cultura-aeronautica-e-aeromodellistica/144252-interessa-loggetto-196.html

Where can I find the article of the Aerofan n°45.
I need dimentions, lengh wingspan.....and an other drawing....

Offline hesham

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Re: Ambrosini (Sergio Steffanuti) Pre-War Projects and Prototypes
« Reply #42 on: June 20, 2014, 07:02:22 am »
Great find Roadrunner.

Offline blackkite

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« Last Edit: June 25, 2016, 06:11:49 pm by blackkite »

Offline blackkite

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« Last Edit: June 26, 2016, 01:16:09 am by blackkite »

Offline blackkite

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Re: Ambrosini (Sergio Steffanuti) Pre-War Projects and Prototypes
« Reply #45 on: June 26, 2016, 01:03:41 am »
I think this drawing is the correct one. We see head rest in front view wind shield.
https://forum.warthunder.com/index.php?/topic/197784-sai-ambrosini-ss4/
This aircraft had a complicated front wing.
I imagine that this aircraft had engine cooling problem at zero speed /taxing condition, too.
" spec                    metric              english
   wingspan                12.32 meters        40 feet 5 inches
   wing area               17.5 sq_meters      188.4 sq_feet   
   length                  6.74 meters         22 feet 2 inches
   height                  2.48 meters         8 feet 2 inches
   empty weight            1,800 kilograms     3,968 pounds
   normal loaded weight    2,446 kilograms     5,392 pounds
   max speed at altitude   540 KPH             335 MPH / 290 KT
 The program came to an abrupt end the next day, 8 March, when Colombo took the machine up for a second flight. An aileron malfunctioned and Colombo tried to set the machine down in available open space; he ran into a tree and was killed, with the aircraft totaled. There was some consideration of building a second prototype, but it didn't happen. The initial flight had not demonstrated any particular superiority to fighter aircraft of conventional configuration, and there had been increasing misgivings about the project anyway. How was the pilot to bail out, for example, without getting chopped to pieces by the rear-mounted propeller? There were also concerns about engine cooling, rearward view, and that the engine would crush the pilot if the aircraft ran into something on the ground. Steffanutti went on to develop lightweight fighter aircraft of conventional configuration."

http://www.secretprojects.co.uk/forum/index.php/topic,2911.30.html

Large three side view drawings
http://www.secretprojects.co.uk/forum/index.php?action=dlattach;topic=2911.0;attach=87568;image
http://www.secretprojects.co.uk/forum/index.php?action=dlattach;topic=2911.0;attach=87570;image
Source
http://www.secretprojects.co.uk/forum/index.php/topic,2911.0.html
« Last Edit: June 26, 2016, 03:38:29 pm by blackkite »

Offline blackkite

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« Last Edit: June 26, 2016, 05:00:50 am by blackkite »

Offline blackkite

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Re: Ambrosini (Sergio Steffanuti) Pre-War Projects and Prototypes
« Reply #47 on: June 26, 2016, 09:24:33 pm »
SAI Ambrosini S.404
https://it.wikipedia.org/wiki/SAI_Ambrosini_404
Auto translation
"During the competition of 1938 for a military aviation authorities held B.G.R. participated: Caproni Ca. 204 and Ca. 211, The Cantieri Riuniti dell'adriatico (C.R.D.A.) with the CANT z. 1014, FIAT with g. 30B, Piaggio with p. 112 and Sai Ambrosini which he compiled an innovative aircraft, the s. 404, inspired by the experience of 30 years of engineer Luigi Stipa.
Luigi Stipa, in fact, flew its Stipa-Caproni which was characterized by a sort of fuselage-nacelle-tunnel enclosing engine and propeller to increase efficiency of the propulsion system, giving the characteristic name turbine wing plane, then called ducted propeller. This aircraft was jokingly labeled "troublemakers" or "plane plane barrel";
' plane which can be regarded as a forerunner of aircraft. "
("High Speed Aerodynamics and Jet Propulsion" ed. Princetown University Press)
To it, as mentioned, was inspired by the design of the s. 404.
According to one source, deserving of further checks, the Sai-Ambrosini 404 was flown on 19 September 1940 to March 1941 and tested by the November 20, 1940 with the armament. His poor flying qualities, especially at low speeds, the aircraft was unmanoeuvrable, together with the tendency to overheating of motors in tandem, made faint interest military bodies.
Technical dscription
S.404 had a metal structure with welded steel tubing for the fuselage while the wings were built instead of aluminum, were planned 8 crewmen. It had a wingspan of 24 m, with a total surface area of 90 m ² a wing loading of 178 kg/m ² and with an overall length of 12.9 m; It was also an unbraced twin tail. The payload was expected to 9000 kg, while that at full load was 16 276 kg.
Engine
It was fitted with Isotta Fraschini Asso XI engines 4 gearless from 840 HP, seats in tandem in the fuselage of the bomber. Three-blade contra-rotating propellers through four, placed in tandem at the entrance of the two side tubes, had a good rate of climb and takeoff. Engine cooling radiator was placed on the inner surface of pipes with the ability to shut off the flow over it.
The aircraft had a top speed of 475 km/h and a maximum range of 4000 km.
Armament
Its armament was 12.7 mm machine guns 8 with 400 rounds per gun.
Operational history
Had no operational use; its development was stopped for her poor flying qualities and for the tendency to overheating of motors.
The Leonardo da Vinci Museum in Milan is a life-sized model of a ducted propeller engined reminiscent of SAI Ambrosini 404.
Variants
Would result from historical archive funds AM-Direction Aircraft» the existence of two 404 built or designed by SAI Ambrosini, SAI ambrosini 404 large RADIUS bomber, described above, and the single-seater fighter Aircraft engine SAI Ambrosini s. 404 Isotta Fraschini Zeta from 1 200-1 400 HP, [4] the latter designed in August 1942, with estimated speed of 670 km/h and armed with two 12.7 mm machine guns and two 20 Safat from Mauser from mm. "

Another site.
http://raigap.livejournal.com/211724.html?thread=444684
Auto translation.
"Draft heavy bomber S.A.I. s. 404 was offered as part of a competition in the year 1938 Regia Aeronautica. Unlike other competitors offering quite traditional schemes and trehmotornyh four-engined aircraft company Societa Aeronautica Italiana (Ambrosini) offered one of the most original projects. The new bomber was based on experience gained in designing and testing of experimental aircraft "Stipa". Despite the fact that in 1933 year project cancelled in mind poor indicators firm Ambrosini still struggled to receive much better performance.
The project S. 404-fuselage concept lay pipes installed inside the engine with a tractor propeller. In 1938 year scheme largely finalized. For the bomber was developed a short and wide fuselage, fuselage sides which were fixed tunnel sections. The engines were mounted inside the fuselage, and inside the "tunnels" were only screws. At the ends of the sections was the tailplane (twin). The main wheels folded chassis and rack in the lower part of the tunnel section and fuselage, tail wheel-tail niche.
The powerplant consisted of four radial engine Isotta Frascini "Asso" (840 HP) Although the total power s. 404 looked worse, its takeoff weight was estimated at 16276 kg that was 4.5 -8.5 tonnes less competitors. Bomber design speed was approximately 475 km/h and at an altitude of 4000 meters
The s. 404 anticipated four firing points with a total number of seven 12.7 mm 0.303 machine guns. In the fore cabin Navigator installed one machine gun, and in the tail and two nadkryl′evyh turelâh had two machine guns. According to the technical requirements of the bomb load was 2000 kg.
Consideration of the project took place in the year 1939. Representatives from D.G.C.A. (Direzione Generale delle Costruzioni) very ambiguously regarded s. 404, questionable aerodynamics of aircraft, as well as landing and maneuverability at low speeds. As a result, the project was cancelled, and major efforts have concentrated on the traditional scheme”
« Last Edit: June 27, 2016, 12:51:25 am by blackkite »

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« Last Edit: June 27, 2016, 12:41:05 am by blackkite »

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Re: Ambrosini (Sergio Steffanuti) Pre-War Projects and Prototypes
« Reply #49 on: June 27, 2016, 05:05:27 am »
S.S.2.
« Last Edit: June 27, 2016, 05:13:40 am by blackkite »

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Re: Ambrosini (Sergio Steffanuti) Pre-War Projects and Prototypes
« Reply #50 on: August 08, 2016, 05:57:02 am »
Hi! Stipa three side view drawing.

http://richard.ferriere.free.fr/3vues/C-3vues.html

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Re: Ambrosini (Sergio Steffanuti) Pre-War Projects and Prototypes
« Reply #51 on: October 17, 2016, 05:19:37 am »
Hi,

here is early Ambrosini SS.4 design with radial engine.

http://www.letletlet-warplanes.com/2009/09/17/italian-aircraft-types/


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Re: Ambrosini (Sergio Steffanuti) Pre-War Projects and Prototypes
« Reply #54 on: January 06, 2017, 02:09:23 am »
Wow really a amazing video!! :o Thanks for sharing. :D

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Re: Ambrosini (Sergio Steffanuti) Pre-War Projects and Prototypes
« Reply #55 on: February 06, 2019, 04:38:44 am »
« Last Edit: February 06, 2019, 04:41:07 am by hesham »

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Re: Ambrosini (Sergio Steffanuti) Pre-War Projects and Prototypes
« Reply #56 on: February 08, 2019, 04:57:29 am »
Wait! What? Is that a Zeta engine with a turbocharger? The word 'stratosferico' seems to be written at the top.

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Re: Ambrosini (Sergio Steffanuti) Pre-War Projects and Prototypes
« Reply #57 on: February 08, 2019, 07:18:06 am »
Wait! What? Is that a Zeta engine with a turbocharger? The word 'stratosferico' seems to be written at the top.

The direct link;

https://forum.warthunder.com/index.php?/topic/197858-progetto-tech-tree-aerei-italiani/&page=158

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Re: Ambrosini (Sergio Steffanuti) Pre-War Projects and Prototypes
« Reply #58 on: February 09, 2019, 01:18:03 pm »
Thank you Hesham for an interesting link:

"Stefanutti (quello degli Aerfer ) nel settembre 1942 presento' il progetto di un caccia stratosferico per intercettare i bombardieri americani. Progetto totalmente originale aveva la cabina stagna, elica di grosse dimensioni, impianti di riscaldamento, guscio centrale della fusoliera blindato con acciaio 6mm, trasparenti di grosso spessore. Motore IF Zeta RC110 1200cv a vari ristabilimenti di potenza. Velocita' stimata in 660km/h , carico alare di soli 132 kg/mq , salita a 10000 in 13'48", tangenza 14300. Armamento vario ...da 4x20 a 4 da 12.7+2x20 .

"Il tutto era probabilmente classificato SAI 307 . Benche le caratteristiche mi paiono assai ottimiste ( l'aereo era mi paiono pesante , 3820 kg e il motore non troppo prestante ) il progetto era interessante anche se ovviamente era troppo tardi per svilupparlo."

My Italian is not very good, but I have translated the above as follows.

"In September 1942, Stefanutti (the one with Aerfer) presented his project for a stratospheric fighter to intercept American bombers. This totally original project had a pressure cabin, a large propeller, a heating system, and a cockpit with 6-mm steel armor and very thick transparencies. A 1200-hp Isotta-Fraschini Zeta RC110 engine “with various power recoveries.” Top speed was estimated at 660km/h, wing loading at 132 kg/sq-m, rate of climb to 10000 m at 13 minutes, 48 seconds, and service ceiling at 14,300 m. Armament varied from 4x20-mm cannon to 2x20-mm cannon plus 4x12.7-mm machine guns.

"The whole was probably classified as the SAI 307. Although the [quoted] characteristics seem rather optimistic (the airplane would have been pretty heavy, 3820 kg and the engine none too strong), the project is interesting although obviously too late for development."

The phrase "a vari ristabilimenti di potenza" (“with various power recoveries”?) puzzles me. But I think it must refer to the engine supercharger's ability to maintain power up to and beyond its critical altitude.

I think that the supercharger was likely mechanical rather than an exhaust-driven turbo. Although the drawing does not rule out the latter, I think it looks more like a Daimler-Benz type hydraulically driven mechanical supercharger.

Interesting in any case.
« Last Edit: February 09, 2019, 01:21:31 pm by iverson »

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Re: Ambrosini (Sergio Steffanuti) Pre-War Projects and Prototypes
« Reply #59 on: February 09, 2019, 03:15:14 pm »
Thank you dear Iverson.