Started messing with my smoke Jacks. Not all the chimneys are the same. There will be some trimming involved to get them that way. I had to increase the angle of the flu so it would sit plumb on the roof. I'm still using my carboard roofs for any template work.
If you notice, the right flu is slightly longer than the left. The right flu is also the one I modified to sit plumb. The back side (left) was left alone and I removed about 1/16" on the front (right) side. I will make all the flu's the same length when I get all 5 completed.
This is the unmodified funnel clearance, but with the correct angle on the dangle.
I removed 1/8" from this funnel to give me a bit more clearance.
This is the modified funnel clearance. If I need to drop it down, there is enough funnel inside the flu to make that happen. But for right now, the funnels will be cut 1/8" shorter.
I found that about 4"x4" should almost center the smoke stack on the engine with the center of the flu.
I have no plan to glue the funnel to the flu. There is enough of a clearance fit that shouldn't be necessary. The only gluing will be the chimney cap. I won't be gluing the jack to the roof either. If something where to happen, it could move accordingly without causing any damage. Basically it'll just sit there. Each smoke jack will be fitted to each spur/bay individually, just so I can ensure it is centered on the center rail of the track.
