How do i manipulate a cylinder i have inserted Hi People :) ok Thanks to Bruno's advise i have been able to move forward a lot with this project Thank you however i have hit another snag and i have tried various things in edit mode to try and do this but ot no avail so i am hoping someone can help me on this to :) as you can see in the picture i have attached there is a picture of what i am trying to copy ( starbug 1 ) and my blender model now as you can see in the first picture the engines round off at the back however my cylinders are round and squared off to go long ways so my question is how do i manipulate this shape to bend down as shown in the original starbug picture?

Many thanks

Simon
All hail Warp Tool

Keep the 3D cursor in the middle of the sphere and place a cylinder half inside the sphere. Scale both sides of the cylinder separately so they have the right diameter. 



Then give the cylinder as many edge loops as you'd like with CTRLR. Keep in mind that it will get stretched quite a bit in a moment.



Now use the warp tool (Mesh>>Transform>>Warp or spacebar). The warp tool bends all selected verts around the 3D cursor. Use the redo panel to the left to set the angle to about 60 degrees, maybe 70.

The warp tool uses the 3D cursor as it's pivot point so make sure it's still in the sphere's center. It also uses the orientation of your window to define the axis. So it's important to normally use one of the main views, ideally without perspective. In this case I use Right Ortho.



I recommend doing that on top of the sphere, finish the entire assembly (exhaust nozzle) and then rotate it from the front to 37 degrees or whatever is closest to the original. 





After that you can either use a mirror modifier or mirror around the cursor by scaling -1 using the right axis. 



Keep your objects along the axes as long as possible to make your work easier. Then place them after they're done.

Tip: Work with single meshes. Easier to select or manipulate, you can make safety copies and hide them with H. You can join them later with CTRLJ