Jump to content

  • Log in with Twitter Log in with Windows Live Log In with Steam Log In with Google      Sign In   
  • Create Account

Photo
- - - - -

FOKKER D.XXI PERFORMANCE / TIMELINE


  • Please log in to reply
13 replies to this topic

#1 CORSNING

CORSNING

    Forum Guru

  • Forum Guru
  • PipPipPipPipPip
  • 2,570 posts
  • Joined 4 Years and 29 Days
  • 182 topics
  • LocationClyde, Ohio, USA

Posted 12 June 2016 - 08:20 PM

Fokker D.XXI Finland 11/11/1939

 

     The following information is from Finnish Aces of WWII an Osprey publication by Kari Stenman.

This information was sent to me by my good friend Michele M. Gaetani.

 

Altitude / Speed / Climb Avg. / Time to Alt.

Meters / kph-mph / avg. fpm./ min.' sec."

S.L.       355 - 221

1,000    369 - 229   2,812      1' 10"

2,000    383 - 238   2,812      2' 20"

3,000    397 - 247   2,812      3' 30"

4,000    407 - 253   2,812      4' 40"

5,000    412 - 257   2,187      6' 10"

6,000    413 - 257   1,790      8' 00"

 

Service Ceiling: 9,500 m. (31,160 ft.)

 

Range: 950 km. (590 mls.)

 

Armament: 2 x 7.7 mm./500 rpg./fuselage + 2 x 7.7 mm./300 rpg./wings.

 

Wing Area: 174.375 sq. ft.

 

Combat Weight: 2,050 kg. (4,510 lbs.)

 

Engine: Bristol Mercury: 840 hp.

 

Wing Loading: 25.86+lbs./sq. ft. (this figure is better than the A6M5, though higher than A6M2/3)

 

Power Loading: 5.369 lbs./hp.

220px-Fokker_D.XXI_%28FR-110%29.jpg

Wikipedia: Aviation Museum of Central Finland


Edited by CORSNING, 01 July 2016 - 05:58 PM.


#2 CORSNING

CORSNING

    Forum Guru

  • Forum Guru
  • PipPipPipPipPip
  • 2,570 posts
  • Joined 4 Years and 29 Days
  • 182 topics
  • LocationClyde, Ohio, USA

Posted 12 June 2016 - 08:41 PM

Fokker D.XXI  Finland 17/05/41 Pratt & Whitney R-1535

 

     Michele Gaetani has supplied the following information which comes from the publication listed above.

 

Altitude / Speed / Climb Avg. / Time to Alt.

Meters / kph - mph / avg. fpm. / min.' sec."

S.L.        342 -  213  

1,000      351 - 218    1,875      1' 45"

2,000      360 - 224    1,875      3' 30"

3,000      354 - 220    1,712      5' 25"

4,000      346 - 215    1,458      7' 40"

5,000      335 - 208    1,158    10' 30"

6,000      320 - 199       691    15' 15"

 

Service Ceiling: 9,000  m.(29,520 ft.)

 

Range: 880 km. (550 mls.)

 

Armament: 4 x 7.7 mm. in wings.

 

Wing Area: 174.375 sq. ft.

 

Engine: Pratt & Whitney R-1535: 825 hp.

 

Combat Weight: 2,050 kg. (4,510 lbs.)

Fokker_D.XXI.jpg

Wikipedia

 

Wing Loading: 25.86+lbs./sq. ft.

 

Power Loading: 5.467-lbs./hp.


Edited by CORSNING, 01 July 2016 - 06:00 PM.


#3 CORSNING

CORSNING

    Forum Guru

  • Forum Guru
  • PipPipPipPipPip
  • 2,570 posts
  • Joined 4 Years and 29 Days
  • 182 topics
  • LocationClyde, Ohio, USA

Posted 12 June 2016 - 08:49 PM

Fokker D.XXI Timeline

 

 

14 November 1934: The D.XXI design is placed before the Netherlands Army Air Division. It was

      designed by Ir. Schatzki and his team in close liaison with Rolls-Royce Ltd. to meet the

     requirements of a specification drawn up by the Royal Netherlands Indies Army.

 

Early 1935: The Army Air Division (Luchtvaortafdeling - LVA) Signed a contract for one prototype.

 

27 March 1936: 1st flight of D.XXI, FD-322 prototype at Welschap airfield near Eindhoven piloted by Fokker's

     Czech chief test pilot, Emil Meinecke.

     Engine: Bristol Mercury VI-S: 645 hp.

     Armament: 2 x 7.62 mm. M.36 FN Browning machine guns in the fuselage/500 rpg. + 2 x 7.62 mm. M.36

           machine guns in the wings./300 rpg.

 

Note: The D.XXI was a sturdy monoplane of simple construction, easily flown and possessing no serious vices.

 

12 November 1936: DF-322 was delivered to Soesterberg for test trials against the Koolhoven Fk-58.

 

Note: The first flight of the Koolhaven Fk.58 was not until September 1938.

 

During 1937: The Netherlands Government voted to expand the LVA. 36 D.XXIs powered by the Bristol

     Mercury VII or VIII (830 hp.) were ordered.

 

During 1937: Finland's government ordered 7 D.XXIs and acquired a manufacturing license. Production

     began at the Valtion Lentokonetehdas (State Manufacturing Factory).

 

20 July 1938: 1st flight of LVA (Netherlands) production D.XXI No.212. The following information comes

     from " War Planes of the Second World War, Fighters Vol.3 by William Green.

     Engine: Bristol Mercury VIII: 830 hp.

     Loaded Weight: 4,519 lbs.

     Wing Area: 174.375 sq. ft.

     Armament: 4 x 7.9 mm. FN Browning machine guns/300 rpg.

     Maximum Speed: 286 mph. (no altitude given).

     Climb: 1,000 m./1.15 min. (2,853 fpm. avg.),   3,000 m./3.4 min. (2,916 fpm. avg. 1,000-3,000 m.),

          6,000 m./7.5 2,400 fpm. (3,000-6,000 m.).

     Service Ceiling: 37,900 ft.

Note: I would like to stress at this time that this is general published material. I do not have any official

     documentation to validate any of these figures.

 

August 1938: One D.XXI powered by the Klimov M-25 flew at El Carmoli by the Spanish Republican forces

     that managed to escape the Nationalist forces that overran the assembly plant in Spain. The M-25A was

     capable of 725 hp. and the M-25V was capable of 750 hp. I do not know at this time which was installed

     in the D.XXI produced in Spain at this time.

 

8 September 1939: The last of the original 36 ordered by the LVA are delivered.

 

30 November 1939: Russia invades Finland. The Finnish Air Force has forty-five D.XXIs on hand. Forty-one

     D.XXIs were on strength with Fighter Squadron HLeLv.24.

 

1 December 1939: Lieutenant Eino Loukkanen in FR-104 recorded the first "kill" of an SB-2.

 

During 1939: Denmark ordered two D.XXIs and took out a manufacturing license for the Royal Army Aircraft 

     Factory in Copenhagen: Producing three aircraft in 1939 and 7 more in 1940. Engine was the Mercury

     VI-S: 645 hp. and armament was 2 x 20 mm. Madsen cannon.

 

9 April 1940: The Danish Aviation Troops had eight D.XXIs in service with No.2 Eskadrille when

     Germany invaded Denmark.

 

10 May 1940: Twenty-eight D.XXIs were operationally combat ready when Germany invaded the Netherlands.

     There were heavy losses on the first day, however the Fokkers destroyed 37 of 55 invading Ju 52/3m

     troop transports of KGr.zbV.9.

 

11 May 1940: Eleven D.XXIs were still operational and gathered together at Buiksloof.

 

14 May 1940: Eight Netherlands Fokkers were still operational.

 

1941: The Finnish government ordered production of fifty D.XXIs. The Bristol Mercury engines were no longer

     available. Pratt & Whitney R-1535 twin wasps were used. The vertical tail surface was increased. The

     engine bearers were shortened to maintain the center of gravity due to the heavier engine. The fuselage

     guns were moved to the wings. The canopy was extended to improve pilot vision. P&W 1535: 825 hp.

     Wing Area: 172.223 sq. ft.

     Armament: 4 x 7.9 mm. in wings.

     Combat Weight: 4.821 lbs.

     Maximum Speed: 272 mph./9,000 ft. (438 kph./2,743 m.)

     Climb: 1,000 m./1.4 min (2,343 fpm. avg.),   3,000 m./4.5 min. (2,117 fpm. avg. from 1,000 m.-3,000 m.)

    

     The information on this aircraft has been very interesting to me. It is easy to get caught up in the

flamboyant fighters like the Spitfire, Mustang and Bf.109. It is another world all together when you research the rugged soldiers that trudged on early in the invasion like the D.XXI, B-534, Gladiator and many other unsung heroes that didn't have the state of art performance but manage to do their jobs past their so called

expected abilities.


Edited by CORSNING, 20 March 2017 - 05:00 PM.


#4 Armand

Armand

    About the same age as another old Fokker: The F-27

  • Forum Guru
  • PipPipPipPip
  • 1,592 posts
  • Joined 3 Years, 6 Months and 30 Days
  • 108 topics
  • LocationAbout 20 nm east of BLL

Posted 12 June 2016 - 10:47 PM

Armament:
As the Finnish as well as the Danes mounted 20mm cannons under the wings (Oerlikon relatively the Danish Madsen), it might have been a standard option :-/

#5 Heräkulman Ruhtinas

Heräkulman Ruhtinas

    Advanced Member

  • Regulars
  • PipPipPip
  • 327 posts
  • Joined 2 Years and 28 Days
  • 12 topics
  • LocationRiga, Latvia

Posted 15 June 2016 - 06:45 PM

Of Finnish Fokkers, only the 7 planes of Series 1, which was built in the Netherlands, had the option for cannon installation. 


  • CORSNING and Armand like this

-<HR>-

Heräkulman Ruhtinas

Prince of Heräkulma

 


#6 Heräkulman Ruhtinas

Heräkulman Ruhtinas

    Advanced Member

  • Regulars
  • PipPipPip
  • 327 posts
  • Joined 2 Years and 28 Days
  • 12 topics
  • LocationRiga, Latvia

Posted 15 June 2016 - 07:28 PM

And:

 

Wing Loading: 25.86+lbs./sq. ft. (this figure is better than the A6M5, though higher than A6M2/3)

 

 

FAF states that Fokker was not turning as well as Soviet planes of the time (1939-40; I-15, -153, -16) in spite of low wing loading but could escape by diving, later diving speed was found inadequate mostly because the drag caused by fixed landing gear (we had one prototype with retractable gear). All in all, Finns avoided fighter furballs during winter war and concentrated on bombers.


  • CORSNING likes this

-<HR>-

Heräkulman Ruhtinas

Prince of Heräkulma

 


#7 CORSNING

CORSNING

    Forum Guru

  • Forum Guru
  • PipPipPipPipPip
  • 2,570 posts
  • Joined 4 Years and 29 Days
  • 182 topics
  • LocationClyde, Ohio, USA

Posted 15 June 2016 - 08:10 PM

Warplanes of the Second World War, Fighters Vol.1 &3 by William Green:

     " The Fokker D.XXI was a tough dependable aircraft. It remained in service with the Finnish Air Force until 1947, and

were not officially declared surplus until 1952."

 

     " Owing to the increased loaded weight (and the decrease in horse power), the P & W R-1535-powered

D.XXI had a slightly reduced performance and was not so maneuverable as the Mercury-powered model."


Edited by CORSNING, 16 June 2016 - 07:06 PM.


#8 Heräkulman Ruhtinas

Heräkulman Ruhtinas

    Advanced Member

  • Regulars
  • PipPipPip
  • 327 posts
  • Joined 2 Years and 28 Days
  • 12 topics
  • LocationRiga, Latvia

Posted 15 June 2016 - 08:52 PM

William Green:

     " The Fokker D.XXI was a tough dependable aircraft. It remained in service with the Finnish Air Force until 1947, and

were not officially declared surplus until 1952.

 

It was though relegated to reconnaissance and fighter training duties from 1942, and when equipped with P&W Wasp it had rather anemic performance (725hp vs 840hp of Mercury) also it was prone to wingtip stall, we lost few planes due that.


  • CORSNING likes this

-<HR>-

Heräkulman Ruhtinas

Prince of Heräkulma

 


#9 Armand

Armand

    About the same age as another old Fokker: The F-27

  • Forum Guru
  • PipPipPipPip
  • 1,592 posts
  • Joined 3 Years, 6 Months and 30 Days
  • 108 topics
  • LocationAbout 20 nm east of BLL

Posted 23 July 2016 - 09:12 PM

2nd week in April 1940: The Danish Aviation Troops had eight D.XXIs in service with No.2 Eskadrille when Germany invaded Denmark.

The actual date is April 9th - Still kept in mind over here!

 

Thank you Armand. I appreciate the help. Information added, Jeff :) 
 


Edited by CORSNING, 24 July 2016 - 12:48 PM.

  • CORSNING likes this

#10 CORSNING

CORSNING

    Forum Guru

  • Forum Guru
  • PipPipPipPipPip
  • 2,570 posts
  • Joined 4 Years and 29 Days
  • 182 topics
  • LocationClyde, Ohio, USA

Posted 24 July 2016 - 12:52 PM

Sorry Armand, I was sending a reply to your post and the next thing I knew your post was gone.???

 

I must have hit edit instead of MultiQuote with my reply. :(


Edited by CORSNING, 24 July 2016 - 01:05 PM.





0 user(s) are reading this topic

0 members, 0 guests, 0 anonymous users