The weaves of the JPL3x family are progressions to [weave=Jens Pind] (JPL3), as e.g. [weave=Jens Pind Linkage 5x2] is to [weave=Jens Pind Linkage 5]. They are in fact not only JPL descendants, but also related to Half Persian chains, as if one ring row is removed, a normal HP(x*2)in1 weave is the result -
in case of JPL3x1.5 this is [weave=Half Persian 3 in 1].
in case of JPL3x2 this is [weave=Half Persian 4 in 1].
in case of JPL3x2.5 this is [weave=Half Persian 5 in 1].
in case of JPL3x3 this is [weave=Half Persian 6 in 1].
See also the references given in JPL5x2's weave description.

3x1.5: Ring size and AR used for submission example are: 1.6mm BA coiled on 9 mm mandrel, final ID ~ 9.6 mm, AR ~ 6.0; the geometric lower AR limit is at around 5.7, but that results in a distorted weave; it looks and behaves better if the AR is slightly increased to around 6.2. And while there is no JPL-typical upper AR limit, the weave becomes imho already too floppy to look good if AR is increased to 6.5 or above.

3x2: Ring size and AR used for submission example are: 1.6mm BA coiled on 9 mm mandrel, final ID ~ 9.6 mm, AR ~ 6.0, where this weave looks and behaves best. The lower AR limit when the chain is near to be stiff, e.g. for sculptural purposes is at AR 5.7. Much higher ARs are possible, as this weave is structural locked and has no JPL-typical upper AR limit, but then the weave can be squished flat.

3x2.5: Ring size and AR used for submission example are: 1.6mm BA coiled on 17/32" mandrel, final ID ~15 mm, AR ~ 9.4; what is also near the lower AR limit when the chain is near to be stiff. Higher AR behavior wasn't tested yet, but should be similar to [weave=Jens Pind Linkage 3x1.5], so higher ARs should be avoided, despite the fact that there's no JPL-typical upper AR limit.

3x3: Ring size and AR used for submission example are: 1.6mm BA coiled on 17/32" mandrel, final ID ~15 mm, AR ~ 9.4 what is a bit loose; this weave looks best near the lower AR limit when the chain is near to be stiff, what happens at around AR 9.0, what was achieved with a 1/2" mandrel for that wire.