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Lets take a simple example of a cube.

I want to cut open one of the face of the cube from its three edges but let the third edge connected so that it looks like a flap.

In a more detailed example:

I got a airplane model enter image description here

I want to cut the cockpit windshield along the selected edges in the following photo , please I don't want to completely cut it out but to let some edges attached to main mesh enter image description here

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    $\begingroup$ You are looking for v rip edge. $\endgroup$ – VRM Feb 7 '15 at 15:45
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This can be done using the Rip tool. Go into edit mode, select and edge or a selection of edges (or a group of vertices):

SelectEdge

Now press V. You will now get something like this:

RippedEdge

For your specific instance do not select the shown edges.

enter image description here

Every edge is made from two vertices, one on each end. When you rip them, those vertices separate from the mesh, and a new edge is created. However the vertices at the end connect to the mesh still. In your example, pressing V would make there be a single vertex connecting the two parts, instead of two edges. Use the suggested selection to get the desire result.

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  • $\begingroup$ what If I want to cut more than one edge? $\endgroup$ – user1062760 Feb 7 '15 at 16:11
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    $\begingroup$ select more than one edge :) $\endgroup$ – Bithur Feb 7 '15 at 16:12
  • $\begingroup$ unfortunately I cannot get it to work as intended, if I select just one edge and press V it also cuts other edges which share the vertices of the selected edge. what am i doing wrong? $\endgroup$ – user1062760 Feb 7 '15 at 16:29
  • $\begingroup$ Like in [this image] (i.gyazo.com/1675c388d27d12648e762dbae92cbc51.png) ripping only the edge shown in white also rips the edges shown in orange $\endgroup$ – user1062760 Feb 7 '15 at 16:33
  • $\begingroup$ @user1062760 You are ripping Vertices, which are connected by edges. Selecting an edge tells Blender which vertices to rip. Think of it that way. $\endgroup$ – VRM Feb 7 '15 at 16:36
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There is a "edge split" tool in the "edge" menu that does just that. Select all the canopy edges and split them, and Bob will be your uncle.

However, if you do that, you will end up with duplicate edges around the canopy, which will be difficult to handle.
First you will need to be in face mode to make sure you select the proper ones (i.e the ones tied to the aircraft or the ones tied to the canopy)
Second, to animate the canopy you will need to rotate all these edges along the hinge, which is pretty awkward to do.

I think it would be easier to separate the canopy from the airframe and then rotate it around the hinge (as a separate object) to open and close it.

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