E4-1 With HP3-1 Trim

Weave Background
Half Persian 3-1 can make a great trim to finish off European 4-1. This tutorial covers 3 ways to add Half Persian 3-1 to European 4-1.
Method I is to make a Half Persian 3-1 chain and European 4-1 patch and attach them. This is the most straightforward way to do it, but can be tricky at low ARs.
Method II is to construct the Half Persian 3-1 chain directly to the European 4-1, just like you do when making Half Persian 3-1 sheet 5. This is slightly harder, but good if you're short on space.
Method III is to add a single row of rings that change the last row of European 4-1 into Half Persian 3-1. This is good if you want to add Half Persian trim to welded maille, for instance.

Methods II and III can also be used to start a Half Persian 3-1 chain, if you like. For those two methods, you'll add the Half Persian to the bottom of the European 4-1.

You can also add Half Persian 3-1 to the other side of European 4-1.

Aspect Ratio & Ring Sizes
In order to make sure everything fits, I recommend rings with an AR of at least 4. If you don't want the European 4-1 bunch up when you add the Half Persian 3-1, you can use a larger AR for the Half Persian 3-1 rings. If you use two different ring sizes, the European 4-1 rings could have a smaller AR than 4, but try a small patch to make sure the Half Persian 3-1 rings can still fit.

Tutorial Color Scheme
For this tutorial, silver rings are European 4-1 rings. Gold rings are Half Persian 3-1 rings. Bronze rings are being added in the current step.

METHOD I

Step 1: Make a HP3-1 chain equal to the desired final length. Make a patch of E4-1 with the same number of edge rings as the HP3-1 chain. When the E4-1 is at full stretch it should be longer than the HP3-1 chain. This is ok - the E4-1 will shrink to match the length of the HP3-1 chain.

Step 2: Add a ring through the two end rings on both the HP3-1 chain and the E4-1 patch. It's a normal E4-1 connection, nothing fancy.

Step 3: Repeat...

Step 4: All the way across to the end.

METHOD II

This time we'll be adding the HP3-1 to the bottom of the E4-1 patch. This is just to make it more similar to HP3-1 Sheet 5. Also note that the E4-1 patch is 4 rows instead of 3.

Step 1: Make your E4-1 patch. Again, this should be longer than the final desired length. Note that the last row in the patch is going the opposite way as Method I.

Step 2: Put 2 closed rings on a open ring, and attach the open ring to the bottom of the E4-1 patch. This is exactly the same as constructing HP3-1 sheet 5.

Step 3: Put a closed ring on an open ring, and attach it in sheet 5 fashion.

Step 4: Repeat all the way across.

METHOD III

Again, we'll be adding the HP3-1 to the bottom of the E4-1 patch. Also note that the E4-1 patch is 5 rows instead of 3 or 4.

Step 1: Start with the E4-1 patch. Note that the bottom link row will become the first HP row. You'll be adding the other row from right to left.

Step 2: Add a ring to the two end rings. In order for it to be a Persian connection, make sure you add the ring so it goes behind the second E4-1 ring.

Step 3: Add a ring to the next 3 E4-1 rings, making sure to go behind two of the E4-1 rings and above the ring added in the previous step.

Step 4: Continue all the way across.