Dave's All The World Fenestrons

Dave's All The World Fenestrons

Fan-in-Fin anti-torque devices (also called Fenestrons, FanTails or Tailfans) have become more popular on helicopters, replacing tail rotors. Quite a number of such designs are now in production. This page attempts to list the technical specifications of all known experimental and production Fenestrons.

Last revised: March 9 2006

Manufacturer
Aerospatiale
Aerospatiale
Aerospatiale
Aerospatiale
Aerospatiale
Aerospatiale
Aerospatiale
Aerospatiale
Aerospatiale

Model
SA341
SA342
SA330Z
SA360
SA365C
SA365N
SA365N1
SA366G
AS350Z

First Flight
1967
1973
1975
1972
1975
1979
1982
1980
1987

Fan Diam (Ft)
2.3
2.3
~4.75
2.95
2.95
2.95
3.6
3.6
2.95

Hub Radius Ratio
0.3
0.3
~.3
0.44
0.44
0.44
0.37
0.37
~.4

Fan/TR Diam Ratio
0.368
NA
~.47
NA
NA
NA
NA
NA
0.48

Fan Speed (RPM)
5774
5774
?
4693
4693
4693
3665
3740
4247

Tip Speed (ft/sec)
695
695
?
725
725
725
691
705
656

# Fan Blades
13
13
11
13
13
13
11
11
10

# Stator Blades
0
0
0
0
0
0
0
0
11

Rotation
BBA
BBA
BBF
BBF
BBF
BBF
BBF
BBF
BBF

Blade Spacing
Equal
Equal
Equal
Equal
Equal
Equal
Equal
Equal
?

Design Power (hp)
?
?
?
?
?
?
?
?
?

Design Thrust (lb)
249
?
?
?
?
?
?
?
?

Fan Airfoils
16-series
63A-series
?
63A-series
63A-series
63A-series
63A-series
63A-series
OAF series

Min Blade t/c
0.06
0.09
?
0.09
0.09
0.09
0.12
0.12
0.095

Max Blade t/c
0.18
0.18
?
0.14
0.14
0.14
0.12
0.12
0.139

Blade Twist (deg)
-12.5
-7
?
-7
-7
-7
-7
-7

Blade Airfoils Cli
?
?
?
?
?
?
0.4
0.4
?

Blade Chord (in)
1.536
1.536
~2.3
1.71
1.71
1.71
3.03
3.03
~2.2

.75R Re @SLS
.426M
.426M
?
.495M
.495M
.495M
.836M
.853M

Fan Solidity
0.46
0.46
~.28
0.40
0.40
0.40
0.49
0.49

Device Loading (lb/ft^2)
60
?
?
?
?
?
?
?
?

Lip Rad (Fan Diam)
.08
?
?
0.1
0.1
0.1
0.069
0.069
?

Duct Length:
?
?
?
?
?
?
?
?
?

Min (Fan Diam)
0.42
0.42
?
0.40
0.40
0.40
0.34
0.34
?

Max (Fan Diam)
0.42
0.42
?
0.46
0.46
0.46
0.41
0.41
?

VT Area (ft^2)
26.30
26.30
?
19.08
19.08
19.08
21.02
21.02
10.79

VT AR
2.31
2.31
?
1.35
1.35
1.35
1.49
1.49
1.26

VT Span (in)
95
95
?
61
61
61
67
67
44

Aircraft GW (lb)
3750
4190
14110
6173
6614
8377
9039
8796
4960

Power Avail (hp)
592
858
3116
1050
1400
1172
1172
1360
732

Manufacturer
Eurocopter
Eurocopter
Eurocopter
Eurocopter
Eurocopter
Eurocopter

Model
EC120
EC130
EC135
EC155
EC565
EC635

First Flight
1995
2000
1994
1997
1984
1994

Fan Diam (Ft)
2.46
3.28
3.27
3.60
3.60
3.27

Hub Radius Ratio
?
?
~.36
?
?
~.36

Fan/TR Diam Ratio
NA
NA
0.52
NA
NA
0.52

Fan Speed (RPM)
4567
?
3545
?
3665
3545

Tip Speed (ft/sec)
588
?
607
?
691
607

# Fan Blades
8
10
10
10
11
10

# Stator Blades
11
11
11
0
0
11

Rotation
BBF
BBF
BBF
BBF
BBF
BBF

Blade Spacing
Unequal
Unequal
Unequal
Unequal
Equal
Unequal

Design Power (hp)
?
?
?
?
?
?

Design Thrust (lb)
?
?
?
?
?
?

Fan Airfoils
OAF series
?
OAF series
OAF series
63A-series
OAF series

Min Blade t/c
?
?
?
?
0.12
?

Max Blade t/c
?
?
?
?
0.12
?

Blade Twist (deg)
?
?
?
?
-7
?

Blade Airfoils Cli
?
?
?
?
?
?

Blade Chord (in)
2.25
?
1.968
?
3.03
1.968

.75R Re @SLS
?
?
?
?
.836M
?

Fan Solidity
0.39
?
~.42
?
0.49
~.42

Device Loading (lb/ft^2)
?
?
?
?
?
?

Lip Rad (Fan Diam)
?
?
?
?
0.069
?

Duct Length:
?
?
?
?
?
?

Min (Fan Diam)
?
?
?
?
0.34
?

Max (Fan Diam)
?
?
~.33
?
0.41
~.33

VT Area (ft^2)
9.64
?
11.52
?
21.02
11.52

VT AR
1.59
?
1.01
?
1.49
1.01

VT Span (in)
47
?
41
?
67
41

Aircraft GW (lb)
4409
5291
5511
11219
9039
5511

Power Avail (hp)
732
848
900
1703
1172
900

Manufacturer
Guimbal
Kamov
Kawasaki
Mil
Mitsubishi
Sikorsky
Sikorsky
Sikorsky
Bell

Model
Cabri G2
Ka-62
XOH-1
Mi-24
MH2000
S-67
H-76
RAH-66
407

First Flight
1992
1995
1996
1975
1997
1974
1990
1996
2004

Fan Diam (Ft)
1.77
3.9
3.609
?
3.609
4.66
3.937
4.5
3.33

Hub Radius Ratio
0.35
0.5
~.3
?
0.375
0.4
0.4
0.4
?

Fan/TR Diam Ratio
NA
NA
NA
?
NA
0.44
0.49
NA
0.615

Fan Speed (RPM)
5734
?
3504
?
?
3000
2935
2865
?

Tip Speed (ft/sec)
531
?
662
?
?
732
605
675
?

# Fan Blades
7
11
8
8
10
7
8
8
?

# Stator Blades
0
0
0
?
0
0
0
0
7?

Rotation
BBF
BBF
BBF
?
BBF
BBF
BBF
BBF
?

Blade Spacing
Equal
Equal
Unequal
?
Equal
Equal
Equal
Equal
?

Design Power (hp)
?
?
?
?
?
835
?
328
?

Design Thrust (lb)
?
?
?
?
?
2100
1624
2347
?

Fan Airfoils
?
?
64A-series
?
64A-series
16-series
64-series
64-series
?

Min Blade t/c
?
?
0.12
?
0.12
0.03
0.1
0.1
?

Max Blade t/c
?
?
0.12
?
0.12
0.33
0.22
0.22
?

Blade Twist (deg)
?
?
-11
?
-7
-31.8
-7
-7
?

Blade Airfoils Cli
?
?
0.45
?
0.45
.4-1.2
0.3
0.3
?

Blade Chord (in)
1.5
?
4.72
?
3.43
5
6.06-6.73
6.6
?

.75R Re @SLS
.318M
?
1.25M
?
?
1.46M
1.50M
1.78M
?

Fan Solidity
0.31
?
0.56
?
0.50
0.4
0.64
0.622
?

Device Loading (lb/ft^2)
?
?
?
?
?
123
133
148
?

Lip Rad (Fan Diam)
?
?
0.07
?
?
0.1
0.075
0.075
?

Duct Length:
?
?
?
?
?
?
?
?
?

Min (Fan Diam)
?
0.43
0.40
?
?
0.41
0.46
0.43
?

Max (Fan Diam)
?
0.43
0.40
?
?
0.47
0.46
0.43
?

VT Area (ft^2)
?
12.45
?
?
?
58.90
24.10
?
?

VT AR
?
1.29
?
?
?
4.12
2.35
?
?

VT Span (in)
?
48
?
?
?
187
90
?
?

Aircraft GW (lb)
1212
12900
7700
22000
10000
16030
10500
10088
5000

Power Avail (hp)
150
2600
1600
4400
1752
3000
1605
2053
813

Dave, caught in the act of gathering more information!

Created and maintained by David Lednicer

Manufacturer	Aerospatiale	Aerospatiale	Aerospatiale	Aerospatiale	Aerospatiale	Aerospatiale	Aerospatiale	Aerospatiale	Aerospatiale
Model	SA341	SA342	SA330Z	SA360	SA365C	SA365N	SA365N1	SA366G	AS350Z
First Flight	1967	1973	1975	1972	1975	1979	1982	1980	1987
Fan Diam (Ft)	2.3	2.3	~4.75	2.95	2.95	2.95	3.6	3.6	2.95
Hub Radius Ratio	0.3	0.3	~.3	0.44	0.44	0.44	0.37	0.37	~.4
Fan/TR Diam Ratio	0.368	NA	~.47	NA	NA	NA	NA	NA	0.48
Fan Speed (RPM)	5774	5774	?	4693	4693	4693	3665	3740	4247
Tip Speed (ft/sec)	695	695	?	725	725	725	691	705	656
# Fan Blades	13	13	11	13	13	13	11	11	10
# Stator Blades	0	0	0	0	0	0	0	0	11
Rotation	BBA	BBA	BBF	BBF	BBF	BBF	BBF	BBF	BBF
Blade Spacing	Equal	Equal	Equal	Equal	Equal	Equal	Equal	Equal	?
Design Power (hp)	?	?	?	?	?	?	?	?	?
Design Thrust (lb)	249	?	?	?	?	?	?	?	?
Fan Airfoils	16-series	63A-series	?	63A-series	63A-series	63A-series	63A-series	63A-series	OAF series
Min Blade t/c	0.06	0.09	?	0.09	0.09	0.09	0.12	0.12	0.095
Max Blade t/c	0.18	0.18	?	0.14	0.14	0.14	0.12	0.12	0.139
Blade Twist (deg)	-12.5	-7	?	-7	-7	-7	-7	-7
Blade Airfoils Cli	?	?	?	?	?	?	0.4	0.4	?
Blade Chord (in)	1.536	1.536	~2.3	1.71	1.71	1.71	3.03	3.03	~2.2
.75R Re @SLS	.426M	.426M	?	.495M	.495M	.495M	.836M	.853M
Fan Solidity	0.46	0.46	~.28	0.40	0.40	0.40	0.49	0.49
Device Loading (lb/ft^2)	60	?	?	?	?	?	?	?	?
Lip Rad (Fan Diam)	.08	?	?	0.1	0.1	0.1	0.069	0.069	?
Duct Length:	?	?	?	?	?	?	?	?	?
Min (Fan Diam)	0.42	0.42	?	0.40	0.40	0.40	0.34	0.34	?
Max (Fan Diam)	0.42	0.42	?	0.46	0.46	0.46	0.41	0.41	?
VT Area (ft^2)	26.30	26.30	?	19.08	19.08	19.08	21.02	21.02	10.79
VT AR	2.31	2.31	?	1.35	1.35	1.35	1.49	1.49	1.26
VT Span (in)	95	95	?	61	61	61	67	67	44
Aircraft GW (lb)	3750	4190	14110	6173	6614	8377	9039	8796	4960
Power Avail (hp)	592	858	3116	1050	1400	1172	1172	1360	732

Manufacturer	Eurocopter	Eurocopter	Eurocopter	Eurocopter	Eurocopter	Eurocopter
Model	EC120	EC130	EC135	EC155	EC565	EC635
First Flight	1995	2000	1994	1997	1984	1994
Fan Diam (Ft)	2.46	3.28	3.27	3.60	3.60	3.27
Hub Radius Ratio	?	?	~.36	?	?	~.36
Fan/TR Diam Ratio	NA	NA	0.52	NA	NA	0.52
Fan Speed (RPM)	4567	?	3545	?	3665	3545
Tip Speed (ft/sec)	588	?	607	?	691	607
# Fan Blades	8	10	10	10	11	10
# Stator Blades	11	11	11	0	0	11
Rotation	BBF	BBF	BBF	BBF	BBF	BBF
Blade Spacing	Unequal	Unequal	Unequal	Unequal	Equal	Unequal
Design Power (hp)	?	?	?	?	?	?
Design Thrust (lb)	?	?	?	?	?	?
Fan Airfoils	OAF series	?	OAF series	OAF series	63A-series	OAF series
Min Blade t/c	?	?	?	?	0.12	?
Max Blade t/c	?	?	?	?	0.12	?
Blade Twist (deg)	?	?	?	?	-7	?
Blade Airfoils Cli	?	?	?	?	?	?
Blade Chord (in)	2.25	?	1.968	?	3.03	1.968
.75R Re @SLS	?	?	?	?	.836M	?
Fan Solidity	0.39	?	~.42	?	0.49	~.42
Device Loading (lb/ft^2)	?	?	?	?	?	?
Lip Rad (Fan Diam)	?	?	?	?	0.069	?
Duct Length:	?	?	?	?	?	?
Min (Fan Diam)	?	?	?	?	0.34	?
Max (Fan Diam)	?	?	~.33	?	0.41	~.33
VT Area (ft^2)	9.64	?	11.52	?	21.02	11.52
VT AR	1.59	?	1.01	?	1.49	1.01
VT Span (in)	47	?	41	?	67	41
Aircraft GW (lb)	4409	5291	5511	11219	9039	5511
Power Avail (hp)	732	848	900	1703	1172	900

Manufacturer	Guimbal	Kamov	Kawasaki	Mil	Mitsubishi	Sikorsky	Sikorsky	Sikorsky	Bell
Model	Cabri G2	Ka-62	XOH-1	Mi-24	MH2000	S-67	H-76	RAH-66	407
First Flight	1992	1995	1996	1975	1997	1974	1990	1996	2004
Fan Diam (Ft)	1.77	3.9	3.609	?	3.609	4.66	3.937	4.5	3.33
Hub Radius Ratio	0.35	0.5	~.3	?	0.375	0.4	0.4	0.4	?
Fan/TR Diam Ratio	NA	NA	NA	?	NA	0.44	0.49	NA	0.615
Fan Speed (RPM)	5734	?	3504	?	?	3000	2935	2865	?
Tip Speed (ft/sec)	531	?	662	?	?	732	605	675	?
# Fan Blades	7	11	8	8	10	7	8	8	?
# Stator Blades	0	0	0	?	0	0	0	0	7?
Rotation	BBF	BBF	BBF	?	BBF	BBF	BBF	BBF	?
Blade Spacing	Equal	Equal	Unequal	?	Equal	Equal	Equal	Equal	?
Design Power (hp)	?	?	?	?	?	835	?	328	?
Design Thrust (lb)	?	?	?	?	?	2100	1624	2347	?
Fan Airfoils	?	?	64A-series	?	64A-series	16-series	64-series	64-series	?
Min Blade t/c	?	?	0.12	?	0.12	0.03	0.1	0.1	?
Max Blade t/c	?	?	0.12	?	0.12	0.33	0.22	0.22	?
Blade Twist (deg)	?	?	-11	?	-7	-31.8	-7	-7	?
Blade Airfoils Cli	?	?	0.45	?	0.45	.4-1.2	0.3	0.3	?
Blade Chord (in)	1.5	?	4.72	?	3.43	5	6.06-6.73	6.6	?
.75R Re @SLS	.318M	?	1.25M	?	?	1.46M	1.50M	1.78M	?
Fan Solidity	0.31	?	0.56	?	0.50	0.4	0.64	0.622	?
Device Loading (lb/ft^2)	?	?	?	?	?	123	133	148	?
Lip Rad (Fan Diam)	?	?	0.07	?	?	0.1	0.075	0.075	?
Duct Length:	?	?	?	?	?	?	?	?	?
Min (Fan Diam)	?	0.43	0.40	?	?	0.41	0.46	0.43	?
Max (Fan Diam)	?	0.43	0.40	?	?	0.47	0.46	0.43	?
VT Area (ft^2)	?	12.45	?	?	?	58.90	24.10	?	?
VT AR	?	1.29	?	?	?	4.12	2.35	?	?
VT Span (in)	?	48	?	?	?	187	90	?	?
Aircraft GW (lb)	1212	12900	7700	22000	10000	16030	10500	10088	5000
Power Avail (hp)	150	2600	1600	4400	1752	3000	1605	2053	813