Clamber
Four measurements you can take with a tape, a phone and a stopwatch, in a building that was never designed to be climbed around. SQUEEZE: will a body pass that hole, in which of seven postures, with how much clearance — head-first, on its belly, turned sideways — read against the code's own minimum openings, and how long your group takes to get through it. CHUTE: a slide as a block on an inclined plane — exit speed, time down, the flat run-out it would take to stop, the sideways load in a curve — and the field exercise that matters, SOLVING the real coefficient of friction backwards from a timed ride. MEMBER: a found bar, pipe, tube or plank checked for bending and deflection off its measured section, with the load at which each check runs out, and a standing note that the member is never what fails. CLIMB: rise against going gives a pitch, a pitch gives a name — stair, ship's ladder, fixed ladder, free climb — and the body's own knee, hip and reach say who in your group can make the move. Every reading drops into a FIELD LOG that exports as CSV or a printable field sheet. Client-side: no account, no upload, works on a phone with no signal.
will a body pass that hole
A hole in a plate is 0. A tube is as long as the tube.
Reference rows load into the sliders — then correct them with a tape. — source: CARRIED, ROUNDED, UNVERIFIED — a teaching row keyed to the ANSUR II (2012) summary statistics (US Army, n = 6,068), not read back from the published report and not your cohort. Check it against the report, or better, measure the person standing next to you. Stature 1,756 mm, bideltoid 492 mm, chest depth 243 mm, hip breadth 348 mm, head 152 × 197 mm.
Belly crawl — passes, 12.5″ clear.
- Walk through — source: Shoulder breadth across, full standing height through. No compression anywhere.NO
needs 69.1″ through, has 24.0″ — -45.1″ · 2 s to travel
- Stoop — source: Shoulder breadth across; bent at the waist stands about 0.75 × stature.NO
needs 51.8″ through, has 24.0″ — -27.8″ · 3 s to travel
- Duck-walk — source: The wider of shoulders and hips across; a deep squat stands about 0.62 × stature.NO
needs 42.8″ through, has 24.0″ — -18.8″ · 6 s to travel
- Sidle (turned sideways) — source: Turned side-on the shoulders run ALONG the slot, so the slot only has to admit your chest depth — at full standing height.NO
needs 69.1″ through, has 24.0″ — -45.1″ · 8 s to travel
- Hands and knees — source: Shoulder breadth across; on all fours the back sits at about 0.42 × stature.TIGHT
needs 29.0″ across, has 30.0″ — +1.0″ · 7 s to travel
- Belly crawl — source: Shoulders roll — one forward, one back — for about 10 %; the thickness is chest depth plus an inch of arm.PASS
needs 17.5″ across, has 30.0″ — +12.5″ · 13 s to travel
- Head-first, one arm leading — source: One arm up and one back rotates the shoulder girdle out of square — about 15 % off the breadth, 8 % off the depth with the lungs emptied. The committing one.PASS
needs 16.5″ across, has 30.0″ — +13.5″ · 23 s to travel
PASS is 2″ of clearance or better; TIGHT is anything down to zero. A screening geometry check — it has no ribcage, no friction and no way of knowing whether you can get back out.
- Flat postures need the chest free to rise. A person wedged on the exhale cannot inhale to push — which is why the belly and head-first rows assume empty lungs and why they are the last two to try.
Writes the squeeze answer, its numbers and your note into the field log. It changes nothing on this page.
Read this once. Clamber is a set of screening calculations for a studio afternoon, not a safety assessment. Every posture, coefficient, allowable and ratio in it is a stated model over numbers you typed — hover any of them to see which. It does not know what the thing is made of, how old it is, what has rusted, or what is holding it up. Decide with your eyes and your hands; use the tool to argue about what you found.