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J. P.
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+x3 part mould, no problem. how???
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Hanaldo
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Two sides and the bottom as you said. Split the sides on the radius of opposing corners and you won't have a problem getting the straight draught sections out. 
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torsten Ker
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I just wonder how you gone get the flange on the bottom outside done if you create a single part out of a single mould, 3 way slit I would recomment to do 2 moulds and glue the halves together 
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torsten Ker
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and split the sides like this, thats how I did it, sorry no picktures, that was a teenage project for my own bike at the time :-) 
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J. P.
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Thanks for the advice, I will post when I do it...
greetings from Chile
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Hanaldo
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+xand split the sides like this, thats how I did it, sorry no picktures, that was a teenage project for my own bike at the time :-) Splitting it like this not only makes the straight draft an issue for release, but it also puts the flash line right down the middle of an aesthetically important area of the bag. Splitting it down the corners means that flash line is much easier to hide, and removes the problem of releasing from a deep draft section as the mould sections will be able to 'twist' away from the component. The flange at the bottom is not an issue, you lay the sections of mould up separately before bolting them together. For wet lay that is simple, for infusion it means measuring the thickness of the original and calculating the thickness of your reinforcement under vacuum consolidation. Easy to achieve on such a small component. Alternatively if you aren't confident laying it up as a single piece, then do it as 2 components and bond it together as you say - but that doesn't affect the mould. You only need a 3 piece mould here for sure. Whether you lay the piece up as a single piece or as separate pieces doesn't change that.
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torsten Ker
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the sides were important, not the photoshop line,
I would only leave a 2inch flange and on one side of the part to be bonded to the second with a semi rigid mould to allow flexibility on demoulding with care
That saddle bag is impossible to do in one mould no matter how many splits with infusion/hand-layup when looking at the shapes and recesses
If you look at the surface, it was welded together from 3 parts, bottom, and 2 sides.
there is another snag, the bottom has too deep recesses but with lots of chemical release agent and an gentle tap using a rubber mullet that should be OK
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Hanaldo
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With respect - I disagree. How it was made originally from metal is largely irrelevant, that is a different process entirely. From what I can see in these pictures, there is nothing that makes it impossible to do as one piece. More difficult yes, but certainly not impossible. I've done several similar parts in a similar fashion, and have no doubt it can be done. At least going from these photos anyway, if there is something I can't see in the photos then that's another story.
Anyway, as I said before: one or two piece construction doesn't matter, it can still be a 3 piece mould which is what the topic question was asking.
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J. P.
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Hanaldo
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Your original finish didn't look very glossy to begin with? And it looks like you've used regular gelcoat rather than tooling gelcoat, which is ok but regular gelcoat does tend to have lower gloss retention than tooling gelcoat.
All of that said, it does look like you've had a minor release failure there as well. What release agent did you use?
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