Author Topic: Stipa-Caproni  (Read 1837 times)

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Offline Scotaidh

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Stipa-Caproni
« on: September 03, 2018, 03:16:50 am »
Stipa-Caproni



Between World War I and II, airplane designers tried tons of experimental ideas, some barely looking like airplanes and few coming out successful. One of the most interesting was the Stipa-Caproni, which looks like a cartoon, but the Stipa-Caproni was actually an important forerunner to modern jets.

The body of the airplane was a ducted fan with a small engine inside. The tube body doesn't look complex, but is the result of intense calculations by designer Luigi Stipa. When air entered the front of the tube, the propeller compressed it and shot the air out the back, providing thrust. Surprisingly, the airplane flew really well, with pilots reporting it to be incredibly stable, with no control issues. In fact, it was so stable, pilots sometimes had a hard time getting it to change direction. Ask any pilot, and they will tell you changing direction mid-flight? A tad important.

Stipa's design was nothing short of revolutionary, but it never caught on. The biggest issue was payload. There was no room for storing passengers, freight, or weaponry, and as world powers built their forces leading up to World War II, payload was critical for new airplanes. Even though the Stipa-Caproni never caught on, it was still an important link between propeller planes and jet engines. Modern turbofan engines use the same principles that Stipa discovered, so when you fly on a big airliner, you are flying on a direct and mobile descendant of this stubby Italian plane.

https://youtu.be/mQ0ZQesixms
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Offline zenrat

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Re: Stipa-Caproni
« Reply #1 on: September 03, 2018, 03:59:26 am »
The Caproni CA 183bis had a DB 605 of 1,250 HP in the nose driving two three-blade contra-rotating props with a 700 HP Fiat A.30 radial behind the cockpit driving a Campini compressor expected to furnish a 60 MPH boost of jet thrust for an optimistic maximum speed of 460 MPH with a range of 1242 miles.

http://italianaircraftwwii.blogspot.com/2015/03/caproni-campini-ca183bis.html
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Offline NARSES2

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Re: Stipa-Caproni
« Reply #2 on: September 03, 2018, 06:39:40 am »
I was aware of the Caproni ducted fan prototype (when I was a kid I just assumed it was a very early jet) but haven't seen that photo before. Neither have I seen those plans for the Ca183 bis.

Cheers lads  :thumbsup:
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Offline loupgarou

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Re: Stipa-Caproni
« Reply #3 on: September 03, 2018, 09:27:19 am »
I was aware of the Caproni ducted fan prototype (when I was a kid I just assumed it was a very early jet) but haven't seen that photo before. Neither have I seen those plans for the Ca183 bis.

Cheers lads  :thumbsup:

It looks like a modern photo. And the plane has a roll-cage behind the cockpit, not present in the original one. It appears someone had the guts to build a flying replica?
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Offline kitnut617

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Re: Stipa-Caproni
« Reply #4 on: September 03, 2018, 11:44:28 am »
I was aware of the Caproni ducted fan prototype (when I was a kid I just assumed it was a very early jet) but haven't seen that photo before. Neither have I seen those plans for the Ca183 bis.

Cheers lads  :thumbsup:

It looks like a modern photo. And the plane has a roll-cage behind the cockpit, not present in the original one. It appears someone had the guts to build a flying replica?

Googling it, it is a modern photo. The one in the photo is a 3/5th scale replica built in Australia that flew in 2001 according to the article.
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Offline NARSES2

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Re: Stipa-Caproni
« Reply #5 on: September 04, 2018, 05:56:27 am »
I was aware of the Caproni ducted fan prototype (when I was a kid I just assumed it was a very early jet) but haven't seen that photo before. Neither have I seen those plans for the Ca183 bis.

Cheers lads  :thumbsup:

It looks like a modern photo. And the plane has a roll-cage behind the cockpit, not present in the original one. It appears someone had the guts to build a flying replica?

Googling it, it is a modern photo. The one in the photo is a 3/5th scale replica built in Australia that flew in 2001 according to the article.

I realised it was probably a replica and after I'd looked at it a little more thought "it looks a little smaller as well". Cheers for the confirmation and extra info  :thumbsup:
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Offline joncarrfarrelly

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Re: Stipa-Caproni
« Reply #6 on: September 04, 2018, 09:35:33 pm »
I was aware of the Caproni ducted fan prototype (when I was a kid I just assumed it was a very early jet) but haven't seen that photo before. Neither have I seen those plans for the Ca183 bis.

Cheers lads  :thumbsup:

The Stipa-Caproni isn't a ducted fan in the normal sense, the propeller is in front of the
hollow fuselage pushing the air through what was is in effect a giant a venturi tube, the entrained
air is accelerated by the interior profile of the tube, incidentally the tube also turned out to act
as an annular wing.
The profile, length, and action of a ducted fan is different as the propeller/fan is set back from
the leading edge of the duct, and with the blade tips as close to the duct walls as possible for the
highest efficiency. The duct is also, generally speaking, relatively short in relation to fan diameter
and any venturi effect is minimal, unlike the Stipa concept wherein generating a venturi effect was
the point.
« Last Edit: September 05, 2018, 12:54:46 pm by joncarrfarrelly »
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Offline NARSES2

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Re: Stipa-Caproni
« Reply #7 on: September 05, 2018, 06:30:04 am »
Ah. Cheers Jon  :thumbsup:
Decals my @r$e!

Offline Mossie

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Re: Stipa-Caproni
« Reply #8 on: September 05, 2018, 07:58:30 am »
Not a type I knew about, nice to see something new. :thumbsup:

Imagining a dogfight double with a Gee Bee.....
I don't think it's nice, you laughin'. You see, my mule don't like people laughin'. He gets the crazy idea you're laughin' at him. Now if you apologize, like I know you're going to, I might convince him that you really didn't mean it.

Offline NARSES2

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Re: Stipa-Caproni
« Reply #9 on: September 06, 2018, 06:16:22 am »


Imagining a dogfight double with a Gee Bee.....

Interestingly the Racing G.B. is up next   :angel:
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Offline pirx

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Re: Stipa-Caproni
« Reply #10 on: September 06, 2018, 07:42:43 am »


Imagining a dogfight double with a Gee Bee.....


New Dora Wings Granville P-45B "Bee killer":




https://www.facebook.com/media/set/?set=a.2242983029265595&type=3&__tn__=-UC-R

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Re: Stipa-Caproni
« Reply #11 on: September 06, 2018, 12:15:11 pm »
Now there's a sharkmouth for you!  :thumbsup:
Any aircraft can be improved by fitting longer wings, and/or a longer fuselage

...and I'm not a closeted 'Take That' fan, I'm a REAL fan! :)

Regards
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Offline Mossie

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Re: Stipa-Caproni
« Reply #12 on: September 06, 2018, 01:47:51 pm »
Neeeeeowww dakka dakka dakka!!! :mellow:
I don't think it's nice, you laughin'. You see, my mule don't like people laughin'. He gets the crazy idea you're laughin' at him. Now if you apologize, like I know you're going to, I might convince him that you really didn't mean it.

Offline kitnut617

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Re: Stipa-Caproni
« Reply #13 on: September 06, 2018, 08:59:26 pm »
Neeeeeowww dakka dakka dakka!!! :mellow:

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Offline Mossie

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Re: Stipa-Caproni
« Reply #14 on: September 07, 2018, 12:24:59 am »
Awwwwww....!!! :angel:
I don't think it's nice, you laughin'. You see, my mule don't like people laughin'. He gets the crazy idea you're laughin' at him. Now if you apologize, like I know you're going to, I might convince him that you really didn't mean it.