Bristol Blenheim - Aircraft of World War II

WAKEN · 07-11-2007, 08:35 AM

Searching the web for the maximum speed of the Bristol Blenheim I and IV I get a lot of differing figures, upto 285mph for the the Mk I and upto 295mph for the Mk IV. What were the top speeds of the 2 types?

Thanks,

Neil

Wurger · 07-11-2007, 09:17 AM

Hi,
According to S/S publication no.88 prototype of Blenheim max. speed - 281 mph
mass-produced Mk.I max speed - 279mph
Mk.IV max speed - 266 mph

Graeme · 07-11-2007, 06:34 PM

And to complicate a simple question further...

From flight reports from Boscombe Down:

The Blenheim Mk 1, with standard engines, had a 'true' top speed of 274 mph @ 13,000ft. This was using Rotol (standard) propellers (2750rpm +5psi).
With careful cleaning, smoothing (including wing fillets) and engine boosted from +5psi to +9psi, speed increased to 296mph (true).

The Blenheim Mk IV, demonstrated a maximum speed of 255 mph @ 2,000ft. Flight testing also revealed different speeds depending on the manufacturer. A Blenheim Mk IV produced by Avro, for example proved to be 5 mph faster than the original Bristol-made aircraft.

The report goes on to mention that better speeds were expected utilising a special paint, called Camotint.

Does anyone know anything about Camotint?

Wurger · 07-12-2007, 02:39 PM

You really complicated this question ,Greame.

But it seems that these speeds of Blenheim MK.I and IV are almost similar.As you have mentioned above, these depended on many conditions (altitude kinds of propelers,paints,bombloads,etc....

WAKEN · 07-13-2007, 06:41 AM

Thanks for your replies Graeme and Wurger.

07-11-2007, 08:35 AM	#1
WAKEN Senior Member Join Date: Jan 2006 Posts: 102	Bristol Blenheim Searching the web for the maximum speed of the Bristol Blenheim I and IV I get a lot of differing figures, upto 285mph for the the Mk I and upto 295mph for the Mk IV. What were the top speeds of the 2 types? Thanks, Neil

07-11-2007, 09:17 AM	#2
Wurger Siggy Master Join Date: Jun 2005 Location: Poland Posts: 15,985	Hi, According to S/S publication no.88 prototype of Blenheim max. speed - 281 mph mass-produced Mk.I max speed - 279mph Mk.IV max speed - 266 mph __________________

07-11-2007, 06:34 PM	#3
Graeme Senior Member Join Date: May 2007 Posts: 2,082	And to complicate a simple question further... From flight reports from Boscombe Down: The Blenheim Mk 1, with standard engines, had a 'true' top speed of 274 mph @ 13,000ft. This was using Rotol (standard) propellers (2750rpm +5psi). With careful cleaning, smoothing (including wing fillets) and engine boosted from +5psi to +9psi, speed increased to 296mph (true). The Blenheim Mk IV, demonstrated a maximum speed of 255 mph @ 2,000ft. Flight testing also revealed different speeds depending on the manufacturer. A Blenheim Mk IV produced by Avro, for example proved to be 5 mph faster than the original Bristol-made aircraft. The report goes on to mention that better speeds were expected utilising a special paint, called Camotint. Does anyone know anything about Camotint? Last edited by Graeme; 07-11-2007 at 06:45 PM. Reason: Camotint, not comotint

07-12-2007, 02:39 PM	#4
Wurger Siggy Master Join Date: Jun 2005 Location: Poland Posts: 15,985	You really complicated this question ,Greame. But it seems that these speeds of Blenheim MK.I and IV are almost similar.As you have mentioned above, these depended on many conditions (altitude kinds of propelers,paints,bombloads,etc.... __________________

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07-13-2007, 06:41 AM	#5
WAKEN Senior Member Join Date: Jan 2006 Posts: 102	Thanks for your replies Graeme and Wurger.