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2017-11-20

NOTES

 
     
 

EFW  N-20  Aiguillon

 
     
  The story which didn't happen ... outside Atlantic Air Combat  
     
  See also : AAC Data Sheet
 
Illustrations :
 EFW20B.Layout
 EFW20B.Loads.Pylons
 EFW20B Loads HVAR
 EFW20B.Loads.Bombs
Illustrations :
 EFW20.Loads.Missiles
 EFW20B.Pack.Recce
 =
 =
Illustrations :
 Original N-20.10 Project
 =
 =
 =
 

INTRODUCTION

During the second word war, Switzerland maintained an armed neutrality based on imported or licensed aircrafts and to a lesser extent to a local design.  After the end of the war, the Swiss industry tried to catch up with the swift technological evolution, and this endeavour lead to the development of two aircrafts which didn't see production but will be cheated into AAC, together with a licensed design

Bf109E3 Emil

D3800 Morane

C3604 Xxxxxx

EFW N20A Aiguillon

FFA P16 Arbalte

VAK-191 Sperber

The EFW N-20.10 Aiguillon

The N-20 was a tailless, swept-wing prototype aircraft which first flew in the shape of a scaled down demonstrator in 1951, with the full scale aircraft being rolled out in April 1952.

The N-20 was to be powered by 4 Pulzer manufactured Armstrong Siddeley Mamba SM5 engines of 3,300 lbf thrust each, and armed with 220mm cannons and a weapons bay holding a variety of interchangeable weapons packs.  However, the development of both engine and aircraft lost government support and the project was shelved in 1952.

The AAC N-20B Aiguillon - The Story which ... didn't happen outside Atlantic Air Combat

It would be understatement to say the Swiss were disappointed with the performances of the Mamba jet, as its initial variant didn't even offer half the announced thrust.   A Saphire powered variant was thus considered (re: the N-20.20 Harpon project) but as it would involve a considerable redesign of the wing, more engine options were considered.

Year Maker Power
Dry (lbf)
Power
Wet (lbf)
Aircraft
mm
Length
mm
Weight
lb/@
  Weight
TOTAL
SFC-Dry
lb/lbf/Hr
SFC-Wet
lb/lbf/Hr
- Westinghouse J30WE20 1600.lbf - F1H1.Phantom 530 2570 705.lb 4 2820 1.18  
1952 AS Viper.201 2500.lbf - GAF Jindivik 624 1625 550.lb 4 2200 1.09 -
- Teledyne J100CA101 3050.lbf - Ryan AQMR 627 1224 430.lb 4 1720 0.94  
- Westinghouse J34WE17 2360.lbf 4850.lbf - 686 2840 1200.lb 4 4800 1.04 1.75
1947 Westinghouse J34WE30 3150.lbf 4225.lbf F6U1 Pirate 686 2840 1200.lb 4 4800 1.04 1.75
1951 Westinghouse J34WE34 3250.lbf - F2H2.Banshee 686 2840 1200.lb 4 4800 1.04  
  Westinghouse J34WE36 3400.lbf - - 686 2840 1200.lb 4 4800 1.04  
1949 AS.Mamba SM01 1365.lbf - N2010.Aiguillon 737 2217 780.lb 4 3120 0.80  
- AS.Mamba SM05 3300.lbf 4850.lbf - - 737 2217 780.lb 4 3120 0.80 1.35
  Bristol Orpheus.1 3284.lbf - --- 823 1854 790.lb 4 3160 1.057 -
1954 Westinghouse J46WE8B 4600.lbf 6000.lbf F7U3.Cutlass 860 5000 2100.lb 4 8400 1.01 2.50
1953 SNECMA Atar.101C 6167.lbf - Mystere IIC 890 3680 2026.lb 2 4052 1.09  
1953 AS Saphire.5a 7500.lbf - --- 950 3404 2600.lb 2 5200 0.85 ???
1953 AS Saphire.5aR 7500.lbf 9200.lbf --- 950 3404 2600.lb 2 5200 0.85 ???
  AS Saphire.6 8300.lbf - Hunter.F2 950 3404 2600.lb 2 5200 0.85  

But while the prototype was proceeding with its test flights, British engineers proved they were good at what they were doing, and step by step reached the promised performances.   Meanwhile, Pulzer had come to terms with their plenum chamber post combustion concept which increased thrust by close to 50%.   With all other teething troubles being ironed out of the N-20.10 Aiguillon production was authorized in 1954 with HS825 30mm guns replacing the HS804 20mm guns initially scheduled as internal armament.

Photo by Sandstein Photo by Sandstein Photo by Sandstein Photo by Sandstein

The AAC N-20B Aiguillon - Variants and Specifications

While a monotype, the Aiguillon  was developped in five variants, according to the internal weapons pack it carried, their armament being supplemented with the two internal guns and external stores hung under four pylons :

EFW20B Aiguillon Weapons Bay Wing Pylons (4) Applications
EFW20B10/N20B various bombs loadouts (2 to 16) air-to-ground
EFW20B20/N20C 04 30mm guns (265 rpg) air-to-ground air-to-air
EFW20B30/N20D 36 51mm FFAR air-to-ground air-to-air
EFW20B40/N20E 02 500 litres fuel cells AIM4C or AIM9B air-to-air
EFW20B50/N20R 01 500 litres fuel cells + 4 cameras reconnaissance

Specifications

The specifications N-20.10 are reminded below with data shown in red being guesstimated.  With AAC referring to specific mass ratio for fuel and ammunition, weights are thus re-calculated the AAC way.

THE DATA BELOW IS STILL BEING WORKED ON.   ESPECIALLY, ILLUSTRATIVE DRAWINGS ARE NEEDED TO FINALIZE THE BOMB BAY LOADOUTS AND UNDERWING PYLONS (JULY 11, 2015)

N20 Aiguillon   N20.10 N20BCD MTOW N20E MTOW N20R MTOW
Length   41'00" 41'00"   41'00"   41'00"  
Span   41'04" 41'04"   41'04"   41'04"  
Height   12'00" 12'00"   12'00"   12'00"  
Wing area   673 ft 673 ft   673 ft   673 ft  
Weight: empty   14440.lb 14440 lb 14440 lb 14440 lb
Weight: CREW 1 200.lb 1 200.lb 1 200.lb 1 200.lb
Engine AS Mamba 4 SM-5 SM-5   SM-5   SM-5  
Power SFC:0.80 4 3300 lbf 3300 lbf   3300 lbf   3300 lbf  
Power:extra SFC:1.35 4 4850.lbf 4850.lbf   4850.lbf   4850.lbf  
Speed: max   591.kn 594.kn   594.kn   594.kn  
Speed: MACH [@35000.ft]   1.03 1.03   1.03   1.03  
Speed: cruise     495.kn   495.kn   495.kn  
Speed: landing     85.kn   85.kn   85.kn  
Speed: stall     80.kn   80.kn   80.kn  
Take off run (STOL)     1500.ft   1500.ft   1500.ft  
Climb.rate (ft/min)   18700 18700   18700   18700  
Ceiling   52500.ft 52500.ft   52500.ft   52500.ft  
Range (indicative, fuel max)   648 nm            
Fuel int.:Total 2950 litres 650.gal 4940.lb 650.gal 4940.lb 650.gal 4940.lb 650.gal 4940.lb
Guns: 20mm 2HS804 200 rpg 229.lb ---   ---   ---  
Guns: 30mm 2HS825 120 rpg - 120 rpg 238.lb 120 rpg 238.lb 120 rpg 238.lb
Radar     AN/APS-19   AN/APS-19   AN/APS-19  
IRD     IRD   IRD   IRD  
Weight: COMBAT   19809.lb 19818 lb 19818 lb 19818 lb
Weapons bay : maximum                
Weapons bay : BOMBS                
50.kg  16  110.lb 1760.lb 16  110.lb 1760.lb        
113.kg  6  250.lb // 6  250.lb 1500.lb        
227.kg  4  500.lb // 4  500.lb 2000.lb   //   //
340.kg  2  750.lb // 2  750.lb 1500.lb        
400.kg  2  880.lb 1760.lb 2  880.lb 1760.lb        
454.kg  21000.lb // 21000.lb 2000.lb        
900.kg  12000.lb // 12000.lb 2000.lb        
Weapons bay : GUN Pack                
Guns: 30mm 4HS825 714.lb              
Ammunition 265 rpg 1051.lb 1765.lb   1765.lb   //   //
Weapons bay : FFAR pack                
Rocket 3687mm ?????              
Rocket 3651mm 4 magasines //   1765.lb   //   //
Weapons bay : RECCE Pack                
Cameras   882.lb              
Fuel Cell 1 500 litres 883.lb 1765.lb   //   // 110.gal 1765.lb
Weapons bay : FUEL Pack                
Fuel Cell 1 500 litres 883.lb              
Fuel Cell 2 500 litres 883.lb 1766.lb   // 220.gal 1766.lb   //
Pylon: Wings                
Inner (Wet) Max 22000.lb // 22000.lb 4000.lb 22000.lb 4000.lb 22000.lb 4000.lb
Inner: fuel 2230.gal 21938.lb // 460.gal 3876.lb 460.gal 3876.lb 460.gal 3876.lb
Outer (dry) Max 2250.lb // 2250.lb 500.lb 2250.lb 500.lb 2250.lb 500.lb
HVAR 6 rails 6150.lb // 6150.lb 900.lb 6150.lb // 6150.lb //
Weight: MTOW Re:N20.20) 26279 lb 21575.lb   27218.lb   26084.lb   25818.lb

Additional Notes (AAC only)

Bomb Bay
With the available illustration regarding the projected N-20.10 showing 50kg and 400 kg bombs, it is assumed these represent the extreme ends of Aiguillon bomb bay capacity.  Intermediate bombs, in size and weight, are thus an extrapolation.

Internal Guns and Guns Pack
The same illustration refers to different weapons for the standard internal set up, and the content of the belly gun pack.  The 20mm HS804 is thus traded in favour of the 30mm HS825 to standardize the aircraft equipment.   The HS825 if of the same family of guns (thus not a high fire rate revolver cannon).   Litterature about the HS825 is scarce, with a few references made to a rof of 950-1000 rpm and... reliability problems.   In AAC, the HS825 is down rated at 900 rpm (see: List of guns).

Guns Pods
Along with the adoption of the HS825 as yet another 30mm gun type, comes the associated gun pod.  Based on the specs of the DEFA gun pod, it holds 250 rpg for a total weight of 800 lbs (see: List of guns).

FFAR Pack
The N-20.10 illustration isn't easy to decypher as far as the rocket pack is concerned : it's made of four rotating magasines, and there is a hint showing appertures at the front end of the "FFAR Pack", suggesting these rockets were fired directly from the rotating magasines....   It is assumed the front magasines were offset to port and starboard and mounted higher up in the compartment, in order for the after magasines to fire under the front ones.   Illustration (blown up view of a FD scale drawing).

Litterature refers to "8.7cm" rockets, but no traces of such a weapon has been found.   Besides, the size shown for the rockets seems more consisent with Oerlikon 51mm (2") rockets.   They are likewise referred to for the "N20B" in AAC.

Range/Loiter Time  (Cruise speed = 66% power: 3300 lbf 4= 13200 lbf 0.660.800(SFC)0.132=920 gal/hour)
The basic rule reminded above is the standard AAC math (cruise speed being reached at 66% power)
            [A]
650.gal
[A+B]
760.gal
[A+B]
870.gal
[A+C]
1110.gal
[A+B+C]
1220.gal
[A+B+C]
1330.gal
[A] Internal fuel   650.gal   Time 0.706 h 0.826 h 0.946 h 1.206 h 1.326 h 1.446 h
[B] Belly fuel pack 1110.gal 110.gal   Range 349.nm 409.nm 468.nm 597.nm 656.Nm 716.nm
[B] Belly fuel pack 2110.gal 220.gal     647.km 757.km 867.km 1105.km 1215.km 1325.km
[C] Drop tanks : 2230.gal 460.gal                
   

Useful Links
Various sources have been used to assemble this fantasy extrapolation of the Aiguillon, some of them are listed below.
http://www.eichhorn.ws/html/body_n20_aiguillon.htm http://i.planepictures.net/101/52/1297680086.jpg
http://www.aviationsmilitaires.net/v2/base/view/Model/839.html http://www.raes-hamburg.de/Downloads/SwissAerospace02.12.2008.pdf

Quick Non-Comparison Table and Feedback
To save time, a quick "non-comparison" table has been prepared, not as much to justify the chosen performances but to put them into perspective.  If anyone wish to share constructive comment, please feel welcome to do so with pierre.deveaux@laposte.net.  

      N-20B Aiguillon FB6 Hunter A-32A Lansen F-84F  Thunderstr. F3H-2 Demon
Year 1954 1956 1955 1954 1956
Engine SM-5 Mamba RA28 Avon RA07.Avon J-65W3 J71A2
Thrust (dry) 13200.lbf 10050.lbf 7621.lbf 7220.lbf 9700.lbf
Thrust (wet) 19400;lbf // 10352.lbf // 14750.lbf
Weight: empty 14440.lbs 14124.lbs 16380.lbs 14000 lbs 21287 lbs
Weight: MTOW 27220.lbs 24600.lbs 30000.lbs 28000 lbs 39000 lbs
Wing area 673 ft 349 ft 403 ft 325 ft 519 ft
Speed: Max Mach 1.03 Mach 0.94 Mach 0.93 Mach 0.94 Mach 1.07
Climb rate 18700 ft/min 17200 ft/min 11811 ft/min 8200 ft/min 14350 ft/min
Ceiling 52500 ft 50000 ft 45900 ft 46000 ft 42650 ft
Fuel: internal 650 gallons 404 gallons 771 gallons 475 gallons 1256 gallons
Guns (internal) 230mm 430mm 420mm 650cal 420mm
Ammunion 120 rpg 150 rpg 180 rpg 300 rpg 150 rpg
Warload Summary 7400 lbs 7400 lbs 6600 lbs 6000 lbs 6000 lbs
External Loads HVAR Outer Inner Fusel Inner Outer HVAR
N20B Aiguillon 7160.lb 450.lb 250.lb 2000.lb 2000 lb 2000.lb 250.lb 450.lb
FB-6 Hunter 7400.lb 700.lb 1000.lb 2000.lb - 2000.lb 1000.lb 700.lb
A32A Lansen 6600.lb 850.lb 500.lb 1320.lb 1320 lb 1320.lb 500.lb 850.lb
F84F Thunder. 6000.lb [600.lb] 1000.lb 2000.lb - 2000.lb 1000.lb [600.lb]
F3H2 Demon 6000.lb - 1500.lb 2000.lb - 2000.lb 1500.lb -

Serial Numbers - Swiss Air Force (Real...Cheated)
Created in 1936, the Swiss numbering for aircraft is based on a prefix (ex: "J" for ) and a number where the first digit identifies the aircraft, and the following digits the aircraft itself.  In some instances the first of these following digits may identify a sub-type.

Inconsitencies
While initially started in the 9xx serie when two USAF P-51D were interned during the war, when purchased in quantities, the type was allocated the 2xxx.   Their removal from service in 1958 immediately followed by the return to active service of several WWII assets saw the P-51D renumbered in the 9xx serie again - it seems the reason for the first shift was that more than a hundred of airframes had been acquired which would have lead the P51 numbers beyond its allocated block.  It can only be assumed that less than 100 airframes being returned to service allowed the re-use of the 9xx block but no official records show any justification.

Logically, the N20 Aiguillon should have been allocated a new digit but wasn't.  When allocated the 13xx serie, it showed as if it was a sub-type of the Vampire/Venom which naturally it wasn't.  So even a Swiss clock may have a hickup....

Type

Qty

Type Name Start Cheated End Cheated

Qty

Serial

to

Serial Serial

to

Serial
TR

52

Bu133C Jungermeister 1937 - 1968 -

-

U.49

U.100 -

-

-
LL

18

Bf108 Taifun 1938 - 1959 -

-

A.201

A.218 -

-

-
TM

3

Ju52 Aunt Ju 1939 - 1981 -

-

A.701

A.703 -

-

-
FF

10

Me109D1 - 1939 - 1949 -

-

J.301

J.310 -

-

-
FF

30

Me109E1 - 1939 - 1949 -

-

J.311

J.340 -

-

-
FF

50

Me109E3 - 1939 - 1949 >>1968

50

J.341

J.390 -

-

-
FF

8

Me109E3 - 1945 - 1949 -

-

J.392

J.399 -

-

-
FF

13

Me109G6 - 1944 - 1949 -

-

J.701

J.713 -

-

-
LL

5

Fi156 Storch 1940 - 1963 >>1968

5

A.96

A.100 -

-

-
FF

84

MS406 D3800 1940 - 1959 -

-

J.3

J.84 -

-

-
FF

100

MS506 D3801 1940 - 1959 -

-

J.101

J.200 -

-

-
FF

97

MS506 D3801 1940 - 1959 >>1968

97

J.201

J.297 -

-

-
FF

10

MS506 D3801 1944 - 1959 -

-

J.91

J.100 -

-

-
FF

9

MS506 D3802 1944 - 1959 >>1968

9

J.406

J.414 -

-

-
RF

160

EKW C36 - 1942 - 1987 -

-

C.401

C.460 -

-

-
TR

26

P2-05 - 1947 - 1979 -

-

U.103

U.128 -

-

-
TR

26

P2-06 (weapons) 1946 - 1981 -

-

U.132

U.157 -

-

-
FF

4

DH100 Vampire Mk1 1947 - 1974 -

-

J.1001

J.1004 -

-

-
FF

75

DH100 Vampire FB6 1949 - 1974 -

-

J.1005

J.1079 -

-

-
FF

3

DH100 Vampire FB6 1960 - 1974 -

-

J.1080

J.1082 -

-

-
FF

100

DH100 Vampire FB6 1951 - 1974 -

-

J.1101

J.1200 -

-

-
TM

3

C45F Expeditor 1945 - 1967 -

-

B.6

B.8 -

-

-
FF

130

P51D Mustang 1948 - 1958 -

-

J.2001

J.2130 -

-

-
FF

112

P51D Mustang 1948 - 1958 >>1968

79

-

-

- J.901

J.979
RF

15

F6D Mustang 1948 - 1958 >>1968

9

-

-

- J.981

J.989
TR

3

TP51D Mustang 1948 - 1958 >>1968

3

-

-

- J.991

J.993
TR

40

AT6/SNJ Texan/Harvard 1949 - 1968 -

-

U.301

U.340 -

-

-
FF

1

EFW N20 Aiguillon 1952 - 1952 -

-

-

-

- J.1301

-

-
FF

3

EFW N20 Aiguillon 1952 - 1952 -

-

-

-

- J.1302

J.1304
FF

96

EFW N20 Aiguillon 1953 - >>> >>1968

96

-

-

- J.1305

J.1400
TR

3

DH115 Vampire T55 1953 - 1990 -

-

U.1201

U.1203 -

-

-
TR

7

DH115 Vampire T55 1954 - 1990 -

-

U.1204

U.1210 -

-

-
TR

20

DH115 Vampire T55 1958 - 1990 -

-

U.1211

U.1230 -

-

-
TR

9

DH115 Vampire T55 1968 - 1990 -

-

U.1231

U.1239 -

-

-
LL

2

L18C Grass Hopper 1952 - 1975 -

-

V.651

V.652 -

-

-
LL

4

L18C Grass Hopper 1964 - 1975 -

-

V.653

V.656 -

-

-
FF

125

DH112 Mk1 Venom FB50 1954 - 1984 -

-

J.1501

J.1625 -

-

-
RF

24

DH112 Mk1 Venom FB50R 1956 - 1984 -

-

J.1626

J.1649 -

-

-
FF

100

DH112 Mk4 Venom FB54 1956 - 1984 -

-

J.1701

J.1800 -

-

-
TR

12

P3-03 - 1954 - 1990 -

-

A.803

A.813 -

-

-
TR

60

P3-05 (weapons) 1956 - 1990 -

-

A.814

A.873 -

-

-
LL

7

Do27 - 1958 - 2008 -

-

V.601

V.607 -

-

-
FF

100

F58 Hunter F6 1958 - 1994 -

-

J.4001

J.4100 -

-

-
FF

30

F58 Hunter FGA.9 1971 - 1994 -

-

J.4101

-

J.4130 -

-

-
FF

22

F58 Hunter FGA.9 1974 - 1994 -

-

J.4131

-

J.4152 -

-

-
TR

8

T68 Hunter T68 1974 - 1994 -

-

J.4201

-

J.4208 -

-

-
HH

10

SA313 Alouette II 1958 - 1992 -

-

V.41

V.50 -

-

-
HH

20

SA313 Alouette II 1964 - 1992 -

-

V.51

V.70 -

-

-
FF

4

FFA P16 - 1959 - 1960 -

-

J.3001

J.3004 -

-

-
FF

96

FFA P16 - 1963 - >>> >>1968

96

-

-

- J.3005

J.3100
FF

1

MD550 Mirage IIICS 1962 - 1978 -

-

J.2201

- -

-

-
FF

36

MD550 Mirage IIICS 1966 1964<< 1999 -

-

J.2301

J.2336 -

-

-
FF

1

MD550 Mirage IIIRS 1964 - 2002 -

-

R.2101

- -

-

-
FF

17

MD550 Mirage IIIRS 1968 1964<< 2002 -

-

R.2102

R.2118 -

-

-
FF

2

MD550 Mirage IIIBS 1964 - 2003 -

-

J.2001

J.2002 -

-

-
FF

1

MD550 Mirage IIIBS 1969 - 2003 -

-

J.2003

-

- -

-

-
FF

1

MD550 Mirage IIIBS 1972 - 2003 -

-

J.2004

-

- -

-

-
FF

2

MD550 Mirage IIIDS 1983 - 2003 -

-

J.2011

-

J.2012 -

-

-
SAM

683

BL64 Bloodhound 1964 - 1999 -

-

-

-

- -

-

-
FF

8

EFW N30 Sperber 1964 - >>> >>1968

8

-

-

- J.5001

J.5008
HH

24

SA319 Alouette III 1964 - 2010 -

-

V.201

V.224 -

-

-
HH

60

SA310 Alouette III 1972 - 2010 -

-

V.225

-

V.284 -

-

-
 
___________