Pick up your ChalkBlaster and look at it for a second. It's a tube. A grip, a brush head, nothing sticking out sideways. That shape is the single hardest thing we've built, and most people never notice it.
Why ChalkBlaster is a jet fan, not a brush
When someone asks what we make, the easy answer is "an electric climbing brush". It's also wrong. The brush is the part you see. The part that does the work is a jet fan sitting inside the handle, pushing air out at high speed to lift chalk off the hold while the bristles loosen it.
Take the brush head off a ChalkBlaster and you're holding a compact jet fan. Put it back on and you're holding a tool that clears a sloper in a couple of seconds. The brush head is an attachment. The fan is the product.
What every other jet fan gets wrong for climbers
Go look at the powerful handheld jet fans you can buy today, the ones people use for cleaning keyboards or drying bike chains. Every single one is a T-shape. The motor sits across the handle, the nozzle points out the side, and the whole thing looks like a tiny hair dryer. The photo at the top of this post shows one next to a ChalkBlaster V2 handle.
A T-shape is easy to engineer. The motor has all the room it wants, the air path is short, and the battery goes in the grip. It's also bulky, awkward in a chalk bag, and useless to hold like a brush. You can't scrub a crimp with a hair dryer.
Motor sits across the handle
Simple to engineer
Bulky, hair-dryer ergonomics
Can't be used as a brush
Motor in line with the handle
Roughly 10x harder to engineer
Fits a chalk bag, holds like a brush
Fan and brush in one motion
What the I-shape costs us in engineering
ChalkBlaster V2 puts the motor parallel to the handle. Air has to come in near your hand, pass the motor, and leave through the brush head, all inside a tube you can grip. The battery, the circuit board, the switch, and the charging port have to share that same tube. Nothing gets to stick out.
That's why we say the I-shape is about 10x more complex to engineer than a T-shape. Every millimeter is contested. Make the intake too small and the airflow dies. Make the motor housing too thick and the grip gets fat. Move the circuit board and the charging port has to move with it. We've written about several of those fights on this blog already, from the air intake to the USB-C port, and they're all the same fight: keep the tube a tube.
What this means on the wall
The difference in your hand is night and day. ChalkBlaster V2 is the size of a thick brush, not a power tool. It goes in the chalk bag next to your tape. You brush and blow in one motion, with the air leaving right where the bristles are working, instead of holding a fan in one hand and a brush in the other.
Compactness was one of our four non-negotiables for V2, next to less noise than V1, the highest air velocity we can get, and a tool that's obvious to use. The I-shape is how we got the first one without giving up the other three. The final V2 prototype left our workshop for the first beta testers in early October, and it's still a tube.
Paul: "Everyone thinks I'm building a brush. I'm not. I'm building a jet fan that happens to have a brush attached. If you're serious about hardware, you can't skip the hard parts."
Quick answers
Is ChalkBlaster just a fan with bristles glued on?
No. The bristles loosen the chalk and the jet fan clears it in the same pass. The brush head is removable, and the air path through the handle is designed around the head being there.
Why not just buy a handheld jet fan and carry a normal brush?
You can, and some climbers do. You'll carry two tools, one of them shaped like a hair dryer, and you'll blow chalk from a different angle than you brush it. ChalkBlaster V2 does both from the same grip.
Does the I-shape make ChalkBlaster V2 weaker than a T-shape fan?
Air velocity is one of the four things V2 refuses to compromise on. The in-line layout is harder to build, not weaker. The hard part is ours, not yours.
SWEEP Climbing builds tools for climbers who take friction seriously.
