Time is precious, and that's not any different with this build. There's a lot to do besides paper building and so progress is slow. But I like what I see. Since I redid the small plumbing at the side of the turbo pump manifold, I really got back into this build. This engine started out as having to end up as another version of Greelt's F-1 engine, which is, in all regards, a beaut. But after the engine bell was made, I just started freewheeling as usual. Discarding most of the parts of the paper kit, making my own and just trying to make as much detail as possible.
I have started on the big tubes around the neck of the engine. These pipes directly distribute the fuel and oxidizer to the turbo pump and the engine. The amount of fuel they needed was incredibly high so they needed to be big.
I also found out the engine went through a lot of modifications before they were used with the Saturn in the end. This version is, in a sense, becoming a bit of a Frankenstein's monster. Greelt used the rounded manifold around the engine bell, while the flown engines had a shape that more or less resembled one's back end. Also, the plumbing differs a lot between versions I have pictures of. Presuming the engine didn't change a lot after the first couple of flights, I presume the other large differences are all older versions of the engine. (if not, let me know, I really am interested in those things).
Anyway, here's some paper stuff to look at. And as usual, more after the jump.
The top end of the engine's neck is made from a cut-out paper circle which I rounded with a ball-shaped embossing tool while the circle was on my hand. The 'rivets' in the cap were done with an embossing ball too.
The start of the next pipe.