Author Topic: Curtiss-Wright CW-21 Ecuador  (Read 5946 times)

Offline GTX_Admin

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Re: Curtiss-Wright CW-21 Ecuador
« Reply #15 on: February 24, 2015, 02:59:28 AM »
I have an article somewhere talking about CW-21B operations in SE Asia.  It didn't fair too well and had structural issues as well (IIRC).  Mind you, they were going up against the Japanese forces at the peak of their power/capability.  I think it would have worked well in Sth America.
« Last Edit: February 24, 2015, 03:02:39 AM by GTX_Admin »
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Offline Acree

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Re: Curtiss-Wright CW-21 Ecuador
« Reply #16 on: February 26, 2015, 09:55:40 AM »
One last CW-21 variant:  this was the CW-21E supplied to Venezuela (among others).  The CW-21E was a progressive development of the CW-21A designed to rectify some of its faults.  Equipped with an 1150 hp Allison V-1710-39 engine and six .30 caliber machine guns, and a new retractable tailwheel, the CW-21E was the best all-around version of the CW-21. 
« Last Edit: February 26, 2015, 04:50:11 PM by Acree »

Offline elmayerle

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Re: Curtiss-Wright CW-21 Ecuador
« Reply #17 on: February 26, 2015, 11:26:55 AM »
Very nice, indeed!!  I like the looks of this one.

Offline Acree

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Re: Curtiss-Wright CW-21 Ecuador
« Reply #18 on: February 26, 2015, 03:35:14 PM »
OK, ONE more CW-21.  Seemed to me as though that float-fighter CW-21C would be pretty attractive to the Netherlands East Indies, so here is one....

Offline perttime

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Re: Curtiss-Wright CW-21 Ecuador
« Reply #19 on: February 26, 2015, 04:18:47 PM »
I really like the look of the CW-21E (with 1150 hp Allison V-1710-39). I feel it is quite cartoonish with the "big nose and chin". The increased side-area up front might affect stability and you'd need a bigger tail too?

To me, the radial powered ones look more balanced from the practical point of view.

Offline Logan Hartke

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Re: Curtiss-Wright CW-21 Ecuador
« Reply #20 on: February 26, 2015, 09:37:25 PM »
Now THAT I really like. Very nice.

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Logan

Offline jcf

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Re: Curtiss-Wright CW-21 Ecuador
« Reply #21 on: February 26, 2015, 11:51:31 PM »
I really like the look of the CW-21E (with 1150 hp Allison V-1710-39). I feel it is quite cartoonish with the "big nose and chin". The increased side-area up front might affect stability and you'd need a bigger tail too?

Very likely based on the problems the P-40 had in that arena, which led to a number of experiments of revised vertical tail design,
which led to the enlarged fin of the K series and, ultimately, to extending the fuselage length.

The first quick'n'dirty fix would probably have been a dorsal fillet.
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Offline Acree

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Re: Curtiss-Wright CW-21 Ecuador
« Reply #22 on: February 27, 2015, 02:07:30 AM »
Quote
Very likely based on the problems the P-40 had in that arena, which led to a number of experiments of revised vertical tail design,
which led to the enlarged fin of the K series and, ultimately, to extending the fuselage length.

The first quick'n'dirty fix would probably have been a dorsal fillet.

I completely agree.  HOWEVER, I tried a quick look at a dorsal fillet - it was aesthetically unsatisfying.  It MIGHT also be less-than effective due to being entirely in the wake of the cockpit canopy and down-sloping rear fuselage.  So, I tried an enlarged fin - UGLY. It would also add stress to an already-weak rear fuselage.  The only real solution would be an extended rear fuselage, taking the opportunity to strengthen the structure: what you would be left with would be a mediocre and uninteresting fighter that bears almost no resemblance to the original CW-21.  It would almost certainly have lost the one thing the CW-21 stood out for - an insane rate of climb. 

So, for all those reasons, I have decided to end CW-21 development with the E-model, even though its snaking tendencies would have made it an inaccurate gun platform. 

Chuck
« Last Edit: February 27, 2015, 02:11:06 AM by Acree »

Offline perttime

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Re: Curtiss-Wright CW-21 Ecuador
« Reply #23 on: February 27, 2015, 02:30:58 AM »
... I tried a quick look at a dorsal fillet - it was aesthetically unsatisfying.  It MIGHT also be less-than effective due to being entirely in the wake of the cockpit canopy and down-sloping rear fuselage.  So, I tried an enlarged fin - UGLY. ...
I was thinking that making the rear fuselage slope less might help with adding side area to the back - but probably still need more fin and rudder. That would be a pretty thorough redesign.... a different type

Offline elmayerle

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Re: Curtiss-Wright CW-21 Ecuador
« Reply #24 on: February 27, 2015, 06:28:55 AM »
Part of the problem with the later P-40's was spillage from the radiator inlet creating turbulence back along the airframe.  One of the reasons, or so it's reported, that Donovan Berlin left Curtiss for Fisher is that he knew of this problem but could never get approval from management to modify the design to eliminate the problem.  I could see the same thing occuring here.