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I've found a very interesting article - Camouflage of 17-pr Gun Mounted in Sherman Tank
http://web.inter.nl.net/users/spoelstra/g104/firefly-cam.htm
As it appeared there was a problem with gun recognizing! Coz enemy fire immediately concentrated on tank equipped with such gun. Just wonder how German disguise Panther`s barrel?
And here is article itself:
The 17-pr gun barrel is approx twice the length of that of the 75mm gun previously mounted. A tank so armed is therefore easily recognizable and when used in support of tanks armed with 75mm gun, is likely to be a target for concentrated enemy fire.
In early October, 1944, G(Cam) Eighth Army were asked for advice on the disguise of the 17-pr gun.
Two methods have been adopted as follows:
Method A.
A false muzzle brake is fitted approximately half-way along the barrel; its distance from the turret being equal to the length of a 75mm gun. The forepart of the barrel is then "countershaded" with white paint to reduce its visibility. The result is an apparent reduction in the length of the barrel. The use of the false muzzle brake was found essential to provide a clear cut termination of the untreated portion of the barrel.
Method B.
A dummy 75mm gun is mounted on the wireless box at the rear of the turret. When the tank is not in action the turret is reversed. The dummy gun is then at the front of the tank and the 17-pr is concealed with foliage behind. Method A can be employed alone, but its use was also recommended in conjunction with Method B to disguise the 17-pr when in action and to reduce visibility of the portion which cannot be covered when the gun is not in action.
17-prs on Sherman tanks are therefore being treated as in Method A whether Method B is employed or not.
A demonstration of both methods was given at RICCIONE on 18 Oct. It was attended by representatives from armoured formations etc., who were asked to state which of the two methods was preferred. Method A met with general approval, whereas reactions to Method B were, as was expected, somewhat varied.
Objections to Method B included the following:-
(a) The danger of both guns being observed.
(b) The possible difficulty, in close country, of rotating the turret in order to bring the 17-pr into action.
(c) The probable adverse effect on confidence of tank crews of moving into action with the turret and 17-pr in the reverse position. Method B, however, was thought good enough to make it worth while manufacturing dummy 75mm guns for use when thought practicable. It was considered that, whatever its limitations might be, it was at least a good method of concealing the identity of the 17-pr Sherman in any concentration area under observation.
50 dummy 75mm guns have been manufactured up to the present date and 24 have so far been fitted.
Copy of a drawing issued to formations showing methods of painting the barrel and fitting of dummy 75mm gun is shown at Appendix "F".
"Method of painting in conjunction with false muzzle brake"
"Method of fixing dummy 75mm gun on rear of turret"
"Position of 17 pr when not in action"
http://web.inter.nl.net/users/spoelstra/g104/firefly-cam.htm
As it appeared there was a problem with gun recognizing! Coz enemy fire immediately concentrated on tank equipped with such gun. Just wonder how German disguise Panther`s barrel?
And here is article itself:The 17-pr gun barrel is approx twice the length of that of the 75mm gun previously mounted. A tank so armed is therefore easily recognizable and when used in support of tanks armed with 75mm gun, is likely to be a target for concentrated enemy fire.
In early October, 1944, G(Cam) Eighth Army were asked for advice on the disguise of the 17-pr gun.
Two methods have been adopted as follows:
Method A.
A false muzzle brake is fitted approximately half-way along the barrel; its distance from the turret being equal to the length of a 75mm gun. The forepart of the barrel is then "countershaded" with white paint to reduce its visibility. The result is an apparent reduction in the length of the barrel. The use of the false muzzle brake was found essential to provide a clear cut termination of the untreated portion of the barrel.
Method B.
A dummy 75mm gun is mounted on the wireless box at the rear of the turret. When the tank is not in action the turret is reversed. The dummy gun is then at the front of the tank and the 17-pr is concealed with foliage behind. Method A can be employed alone, but its use was also recommended in conjunction with Method B to disguise the 17-pr when in action and to reduce visibility of the portion which cannot be covered when the gun is not in action.
17-prs on Sherman tanks are therefore being treated as in Method A whether Method B is employed or not.
A demonstration of both methods was given at RICCIONE on 18 Oct. It was attended by representatives from armoured formations etc., who were asked to state which of the two methods was preferred. Method A met with general approval, whereas reactions to Method B were, as was expected, somewhat varied.
Objections to Method B included the following:-
(a) The danger of both guns being observed.
(b) The possible difficulty, in close country, of rotating the turret in order to bring the 17-pr into action.
(c) The probable adverse effect on confidence of tank crews of moving into action with the turret and 17-pr in the reverse position. Method B, however, was thought good enough to make it worth while manufacturing dummy 75mm guns for use when thought practicable. It was considered that, whatever its limitations might be, it was at least a good method of concealing the identity of the 17-pr Sherman in any concentration area under observation.
50 dummy 75mm guns have been manufactured up to the present date and 24 have so far been fitted.
Copy of a drawing issued to formations showing methods of painting the barrel and fitting of dummy 75mm gun is shown at Appendix "F".
"Method of painting in conjunction with false muzzle brake"
"Method of fixing dummy 75mm gun on rear of turret"
"Position of 17 pr when not in action"
