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Waco DKS / HKS / UKS / VKS / YKS / ZKS / C-72

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YKS-7

 

When Waco released its slightly larger custom cabin series, those original Cabin series aircraft it continued to produce were re-designated as 'Waco Standard Cabin series', with the final designation letter changing from C to C-S to S. For instance in 1935 the YKC became the YKC-S, then the YKS-6 in 1936. All three were indistinguishable from each other. Waco used numeric suffixes like -7 to indicate a sub-variant introduced in 1937 and so on. The standard cabin can be subdivided again into three groups, early examples having a boat-tail skylight (QDC, OEC & UEC), mid series aircraft with a faired skylight (CJC, UIC, UKC, YKC) or late examples with no skylight (DJC-S, HKS, ZKS, UKC-S UKS-7, VKS-7, YKC-S, YKS-6 & 7, ZKS-6 & 7). All of the types built under the C-S and S designators lacked a skylight though the skylight could be faired over on earlier aircraft. Later types were also slightly longer than earlier models.
 
 Waco-ZKS-01
Waco ZKS-6
 
From about 1937, all S series aircraft had wings lacking leading and trailing edge cutouts. Externally, the S series differed from the Custom or later C series in continuing with early C series features such as ailerons on both wings, linked by a prominent strut, and square edged rear side windows. Like most Waco aircraft, the S series were available with many different engines (identified by the first letter of the type designation).
 
The S series proved to be popular with both commercial and private pilots and over 50 were still airworthy in 2001, including examples of the CPTP VKS-7F version. During the Second World War several S series aircraft were impressed by the USAAF as the UC-72K or UC-72M and used as Liaison, executive light transport and instrument refresher training aircraft. Two VKS-7 became UC-72D, one YKS-7 became UC-72K, and two ZKS-7 became UC-72M, in 1942.
 
 Waco-YKS-02
1936 Waco YKS-6
 
The 29 ZKS-6 & 7 built were re-designated from ZKC-S in 1936.
 
 Waco-YKS-03
Waco YKS-6
 
65 YKS-6 built and 21 ZKS-7 1937 (ATC 626) built at $5,695, one was converted to HKS-7 (300 HP Lycoming R-680-13 in 1947).
 
 Waco-YKS-04
Waco YKS-7 NC19371
 
One YKS-7 was impressed by the USAAF as UC-72K in 1942 (NC19353) and one to the USN (09784).

 

Probably only one DKS-6 was built, in 1936.
 
Waco-HKS-01
 Waco HKS-7 NC50662
 
The HKS-7 and HPF-7 of 1948 were not Waco production, but UKS (HKS-7) and UPF (HPF-7) modified with 300hp Lycomings (hence the "H") and issued an STC. Two were reported as converted, NC29998 and NC32065, the latter reregistered NC50662.
 
Waco-HPF-01
Waco HPF-7 NC32065

 

Two of the 1937 UKS-7(ATC 648) were built, NC17721 and a CF- registered example, priced at $5,980.
 
Waco-UKS7-01
Waco UKS-7 NC17721

 

Eighteen 1937 VKS-7 (ATC 648) were built at $5,980, of which two were impressed by USAAF as UC-72D (NC2307 and NC20955. Twenty-one VKS-7F cross-country trainers with controllable-pitch propeller went to the CPTP, with some repowered with 250hp W-670.
 
 Waco-VKS-01
Waco VKS-7F NX31658

 

Six 1934 ZKS/ZKS-6 (ATC 533) were built; NC49, NC14050, NC17456, NC17460, CF-BDK, CF-BBQ, the ZKS-6 appearing in 1936. Redesignated ZKC-S Standard in 1935.
 
 Waco-ZKS-02
Waco ZKS-6 NC330TC
 
Eighty-six YKS-7/ZKS-7 were built, of which two ZKS-7 were impressed by the USAAF as UC-72M (NC2628, NC20954) and two as UC-72P (NC20909, NC20950). The 1937 ZKS-7 (ATC 626) was priced at $6,435.
 
 Waco-ZKS-03
Waco ZKS-7 NC17701

 

Gallery

 

Variants:
 
DKS-6 
Engine: Wright R-760, 285hp
Seats: 4
 
HKS-7
Date: 1939, 1947
Engine: Lycoming R680-13, 300 hp (224 kW)
Length OA: 25'3"(7.70m)
Span (upper): 33'3"(10.13m)
Span (lower): 28'3"(8.61m)
Maximum Speed: 168 mph (270 km/h)
Empty weight: 2,020 lb (916 kg)
Max gross weight: 3,250 lb (1,474 kg)
Maximum load: 1,322 lb (600 kg)
Price: $7,600
 
UKC / UKC-S / UKS-6
Engine: Continental R-670, 2100NaN0p
40 built.
 
UKS-6
Engine: Continental R-670-K, 210 hp (157 kW)
2 built
 
UKS-7
Date: Jun 1937
Engine: Continental W-670-K, 225 hp (168 kW)
Length OA: 25'3"(7.70m)
Span (upper): 33'3"(10.13m)
Span (lower): 28'3"(8.61m)
Maximum Speed: 147 mph (237 km/h)
Empty weight: 1,907 lb (865 kg)
Max gross weight: 3,250 lb (1,474 kg)
Maximum load: 1,343 lb (609 kg)
Price: $5,890
 
UKS-7
Engine: Continental W-670M, 225hp
Wingspan: 33'3"
Length: 25'3"
Useful load: 1343 lb
Max speed: 147 mph
Cruise speed: 130 mph
Stall: 50 mph
Range: 500 mi
Seats: 4-5

 

VKS-7
Engine: Continental R-670-B, 2250NaN0
 
VKS-7
Date: Jun 1937
Engine: Continental W-670M, 240 hp (179 kW)
Length OA: 25'3"(7.70m)
Span (upper): 33'3"(10.13m)
Span (lower): 28'3"(8.61m)
Empty weight: 1,917 lb (870 kg)
Max gross weight: 3,250 lb (1,474 kg)
Maximum load: 1,333 lb (605 kg)
Maximum Speed: 149 mph (240 km/h)
Cruise speed: 133 mph
Stall: 50 mph
Range: 530 mi
Seats: 4-5
Price: $5,890
18 built
 
VKS-7
Date: 1938
Engine: Continental W-670M, 240 hp (179 kW)
Length OA: 25'3"(7.70m)
Span (upper): 33'3"(10.13m)
Span (lower): 28'3"(8.61m)
Maximum Speed: 145 mph (233 km/h)
Empty weight: 1,960 lb (889 kg)
Max gross weight: 3,250 lb (1,474 kg)
Maximum load: 1,290 lb (585 kg)
Price: $7,770
18 built
 
VKS-7F
Date: Jun 1937
Engine: Continental W-670M, 240 hp (179 kW)
Length OA: 25'3"(7.70m)
Span (upper): 33'3"(10.13m)
Span (lower): 28'3"(8.61m)
Height: 8 ft 6 in (2.59 m)
Wing area: 244 ft2 (22.69 m2)
Empty weight: 2,256 lb (1,023 kg)
Max gross weight: 3,250 lb (1,474 kg)
Maximum load: 994 lb (451 kg)
Maximum Speed: 145 mph (233 km/h)
Cruise speed: 127 mph (204 km/h)
Range: 518 miles (833 km)
Service ceiling: 13,000 ft (3,962 m)
Rate of climb: 850 ft/min (4.3 m/s)
Crew: 1
Capacity: 3 or 4 passengers
Price: $12,500
Built for Civilian Pilot Training Program as navigational trainer
F designates use of flaps

21 built

 

YKS-6
Date: 1936
Engine: Jacobs L-4, 225 hp (168 kW)
Length OA: 25'4"(7.72m)
Span (upper): 33'3"(10.13m)
Span (lower): 28'3"(8.61m)
Maximum Speed: 144 mph (232 km/h)
Empty weight: 1,809 lb (821 kg)
Max gross weight: 3,250 lb (1,474 kg)
Maximum load: 1,441 lb (654 kg)
Price: $4,995
 
YKS-7
Date: Feb 1937
Engine: Jacobs L-4M/MB, 225 hp (168 kW)
Length OA: 25'3"(7.70m)
Span (upper): 33'3"(10.13m)
Span (lower): 28'3"(8.61m)
Empty weight: 1,882 lb (854 kg)
Max gross weight: 3,250 lb (1,474 kg)
Maximum load: 1,368 lb (621 kg)
Maximum Speed: 146 mph (235 km/h)
Cruise speed: 130 mph
Stall: 50 mph
Range: 590 mi
Seats: 4-5

Price: $5,695

 
ZKS / ZKS-6
Engine: Jacobs L-5, 285hp
Wingspan: 33'3"
Length: 25'4"
Seats: 4
 
ZKS-6 
Engine: Jacobs L-5, 225 hp (168 kW)
 
ZKS-7 
Engine: Jacobs L-4, 225 hp (168 kW)
 
ZKS-7
Date: Feb 1937
Engine: Jacobs L-5, 285 hp (213 kW)
Length OA: 25'3"(7.70m)
Span (upper): 33'3"(10.13m)
Span (lower): 28'3"(8.61m)
Empty weight: 1,928 lb (875 kg)
Max gross weight: 3,250 lb (1,474 kg)
Maximum load: 1,322 lb (600 kg)
Maximum Speed: 153 mph (246 km/h)
Cruise speed: 136 mph
Stall: 50 mph
Range: 560 mi
Seats: 4-5
Price: $6,135
 
 
 

 

 

 


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