Flying Geese Quilt Block Tutorial: The One-Stitch Fix
Welcome to Straight Stitching, where I will share my passion for quilting. If your flying geese keep coming out just a little too small - points shy of the seam line, units that don't quite reach the size your pattern promised - you are in very good company. Today I want to walk you through a flying geese quilt block tutorial built around one small change that makes the biggest difference. We'll use Block 9 of my 2026 Mosaics & More Block of the Month, a mosaic star called Mosaic No. 3, as our project.
To make a flying geese quilt block, draw a diagonal line on two small squares, align one square in each corner of a background rectangle, and sew one stitch length behind the line - not on it. Flip, press, and trim. Sewing behind the line gives you room so your finished unit matches your pattern's size.
Prefer to sew along? Watch the full Block 9 tutorial here.
What We're Making: A Mosaic Star from Two Simple Units
One of the things I love about traditional mosaic blocks is how honest they are. There's no mystery construction hiding inside - Mosaic No. 3 is built from exactly two units you may already know: half square triangles and flying geese. The half square triangles form the four corners and the pinwheel at the center. The flying geese form the star points. That's it.
That simplicity is by design. My Block of the Month program deliberately returns to standard units month after month, because repetition is how beginner quilters get better. You don't need a new trick every time you sit down at your machine. You need another chance to practice the fundamentals - and a block that rewards you with a finished mosaic star at the end.
In the video, we sewed this block in Art Gallery Fabrics Pure Solids: Marmalade, Raspberry Rose, and Snow. (Thank you to Art Gallery Fabrics for generously providing the fabric for this year's series.) The finished block measures 12 inches - 12½ inches unfinished - and everything in this tutorial scales to whatever block you're working on.
Half Square Triangles Four at a Time
Before we get to the geese, the corners. If you've been sewing along with the series, you've used the four-at-a-time method several times this year, and this block uses it twice - once for the corner units (HST1) and once for the pinwheel center (HST2).
Here's the method in three steps:
Layer two squares right sides together - in our block, Marmalade and Snow - and sew a quarter of an inch around all four sides of the square.
Make two diagonal cuts, corner to corner in both directions.
Press and trim. You'll have four identical half square triangles, ready to trim down to the size your pattern calls for.
That trimming step matters more than it seems. Every unit in this block gets squared up before assembly, and here's why: your block can only be as accurate as its smallest piece. If you don't have written instructions in front of you, use this self-check from the video - make sure every subunit you sew is the same size as its neighbors.
For more practice with half square triangles, my Starry Duo pattern and Sew Sampler pattern, are built on the same foundations you're using here.
Flying Geese One at a Time: The Stitch and Flip Method
Now the star points. There are several ways to make flying geese - four-at-a-time no-waste methods, paper piecing, specialty rulers - but for this block we're making them one at a time with the stitch and flip method, because it's the most forgiving place for a beginner to start.
Here's how it works:
Gather your pieces. Each flying geese unit needs one background rectangle (the "sky") and two small squares that will become the points - what I like to call the wings. In our block, that's a Snow rectangle with one Marmalade square and one Raspberry Rose square.
Draw a diagonal line on the wrong side of both small squares.
Align the first square in one corner of your rectangle, right sides together, and pin it so it doesn't shift while you sew. For our block, Marmalade goes on the left and Raspberry Rose on the right.
Sew behind the line. This is the heart of the whole tutorial, so let's slow down here.
Why You Sew Behind the Line (Not On It)
Here is the one-stitch fix. When you sew stitch and flip units, don't sew directly on your drawn line - sew just a smidge behind it, about one stitch length toward the corner.
Why? Because when you flip that corner triangle up and press it, the fold of the fabric takes up a tiny bit of room. If you sewed exactly on the line, your flipped triangle lands just short of the edge - and your flying geese unit comes out a little smaller than the size listed in your pattern. Sewing one stitch length behind the line gives you that little bit of wiggle room to maneuver, so when you flip the corner up, it covers the rectangle completely and your unit measures true.
If your geese have been mysteriously shrinking on you, this is almost certainly the reason. It's not your machine, and it's not your skill. It's one stitch of breathing room.
Once you've flipped and pressed, check that the triangle covers the corner - in the video I looked at mine and called it "near perfect," and near perfect is exactly the standard I want you to hold. Then trim the excess fabric behind the flipped corner, lining your ruler up on the quarter-inch line. And yes, save those scraps - those little trimmed triangles add up, and we'll find a use for them.
Repeat with the second square on the opposite corner, then make four geese total. If you're comfortable, chain piece them to save time.
Assembling the Mosaic Star
With all your units made and trimmed, assembly is the calm part:
Center: Sew your HST2 units into a pinwheel - two pairs first (the top and bottom of the pinwheel), then join the pairs into the center unit.
Layout: Place your HST1 units in the four corners and your flying geese on the four sides, points facing out from the pinwheel.
Rows: Flip, pin, and sew each row with a quarter-inch seam, press, then join row one to row two, and row two to row three.
That's Mosaic No. 3 - 12½ inches unfinished, 12 inches finished, and every bit of it made from skills you now own.
Frequently Asked Questions
Why do my flying geese come out too small?
Most often because you sewed directly on your drawn line. The fold of the flipped fabric takes up room, shrinking the unit. Sew one stitch length behind the line instead, and your geese will match your pattern's listed size.
What is the stitch and flip method in quilting?
Stitch and flip means sewing a small marked square to the corner of a larger piece, then flipping the square over the seam and pressing it to form a triangle corner. It's a beginner-friendly way to make flying geese and other angled units without cutting triangles.
How do you make four half square triangles at once?
Layer two squares right sides together, sew a quarter inch around all four sides, then cut corner to corner in both diagonal directions. Press the four resulting units open and trim each to the size your pattern requires.
What size is the Mosaic No. 3 block?
It measures 12½ inches square unfinished and finishes at 12 inches once sewn into a quilt.
Can I still join a Block of the Month program partway through the year?
Yes. When you join the 2026 Mosaics & More BOM Club, you get every previous month's video and written pattern, and the blocks come together quickly enough to catch up comfortably.
Keep Your Geese Flying Straight
If your points don't match perfectly yet, that's okay - you now know the one small change that makes the biggest difference. To keep it beside your machine, I've put the whole method on a single printable page: the Flying Geese Cheat Sheet, with the stitch and flip steps, the sew-behind-the-line tip, and a trimming reference. Enter your email below and I'll send it straight to your inbox.
Get the Free Flying Geese Cheat Sheet →
Happy Stitching,
Tiffany