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Blackburn Velos


Torpedo Bomber Biplane / Seaplane


Aviation / Aerospace

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Image from the Public Domain.

The Greek Blackburn Velos was a modified form of the original British Blackburn Dart - revised to suit Hellenic Navy requirements.



Authored By: Staff Writer | Last Edited: 5/27/2020 | Content ©www.MilitaryFactory.com
The Blackburn "Dart" was a post-World War I, British-designed and produced, torpedo bomber biplane of 1922 that eventually found its way into the inventory of the Hellenic (Greek) Navy as the Blackburn T.3 "Velos". Blackburn Aircraft was instrumental in bringing about the indigenous State Aircraft Factory (SAF) for Greece and the new concern's first serially-produced aircraft became the Velos itself. Despite being formally founded in 1925, the SAF actually held origins back in the fighting of the Great War in 1917 but did not gain traction until well after cessation of hostilities.

Unlike the single-seat Dart, the Velos was finalized for Greek service as a two-seat floatplane while retaining most of the form-and-function of the original. Its primary over-water role was in coastal defense of Greece's vast shorelines and strategic waterways. A first-flight in prototype form was recorded in 1925 and service entry followed soon after. Serial production led to just twenty-two examples being built with the last unit retired from service in 1936.

The aircraft utilized a conventional over-under biplane wing arrangement that relied on parallel struts and cabling - the members being slightly cranked upwards from centerline. The engine was installed at the nose in the usual way while the fuselage tapered towards the rear where a single, rounded vertical tailplane was fitted. Horizontal planes were low-mounted near the base of the rudder. The crew of two sat in tandem, open-air cockpits aft of the upper wing member and, unlike the earlier Dart, the Velos could be rigged to operate as either a waterborne seaplane or land-based aeroplane.

Dimensions of the landplane form included a length of 33.5 feet, a wingspan of 48.5 feet, and a height of 12.2 feet. Empty weight reached 3,765lb against an MTOW of 6,400lb. Power was from a single Napier Lion IIB (or Lion V) series inline piston engine developing 450 horsepower and driving a two-bladed propeller unit at the nose. Performance specs included a maximum speed of 110 miles-per-hour, a cruising speed near 70 mph, a service ceiling up to 13,400 feet, and a mission endurance window of about 4.5 hours. Rate-of-climb reached 620 feet-per-minute.

Armament centered around a single 18" (457mm) torpedo or up to 4 x 230lb conventional drop bombs depending on mission need. The rear crewman was given a single 0.303" (7.7mm) Lewis Machine Gun on a trainable mounting for self-defense of the aircraft. The rear-facing machine gun, as well as the conventional bomb capability, were both qualities not found on the original Dart design.

The first lot of Velos aircraft were produced by Blackburn at Brough Aerodrome before the SAF took on the remainder of the T.3 manufacturing commitment. Later aircraft incorporated improved cooling for the Napier engine and a slightly raised position for the rear machine gunner to improved both vision and firing arcs. The first Greek-produced Velos aircraft recorded its first flight 1926 and made history for the nation. Formal Hellenic Navy operations involving Velos torpedo bombers began that same year and the fleet was operated in a frontline manner until 1934 (Blackburn Darts were given up globally back in 1933).

The advanced "T.3A" offering of 1927 was proposed by Blackburn with all-new metal floats as well as other subtle improvements. However, there proved little interest on the foreign market and just two were built for demonstration purposes before being relegated to seaplane training.


Specifications



Year:
1926
Status
Retired, Out-of-Service
Crew
2
[ 22 Units ] :
Blackburn Aircraft - UK / State Aircraft Factory (SAF) - Greece
National flag of Greece Greece
- Ground Attack
- Anti-Submarine Warfare (ASW)
- Anti-Ship
- Navy / Maritime
- Reconnaissance (RECCE)
- Training
Length:
35.50 ft (10.82 m)
Width:
48.49 ft (14.78 m)
Height:
12.30 ft (3.75 m)
(Showcased structural dimension values pertain to the Blackburn T.3 production model)
Empty Weight:
3,781 lb (1,715 kg)
MTOW:
6,393 lb (2,900 kg)
(Diff: +2,612lb)
(Showcased weight values pertain to the Blackburn T.3 production model)
1 x Napier Lion IIB inline piston engine developing 450 horsepower driving two-bladed propeller at the nose.
(Showcased powerplant information pertains to the Blackburn T.3 production model)
Max Speed:
109 mph (175 kph; 94 kts)
Service Ceiling:
14,108 feet (4,300 m; 2.67 miles)
Max Range:
323 miles (520 km; 281 nm)
Rate-of-Climb:
620 ft/min (189 m/min)
(Showcased performance values pertain to the Blackburn T.3 production model; Compare this aircraft entry against any other in our database)
STANDARD:
1 x 0.303" (7.7mm) Lewis Machine Gun on trainable mounting in rear cockpit.

OPTIONAL:
1 x 18" (457mm) aerial torpedo underfuselage OR 4 x 230lb conventional drop bombs underwing.
(Showcased armament details pertain to the Blackburn T.3 production model)
"Velos" - Base Series Name; total production of twenty-two units.
T.3 - Base Production Model; land-base or waterborne capable.
T.3A - Proposed advanced model with all-metal floats.
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