Bay III
The Radial
Nine cylinders · air-cooled
Pull it through
Cylinders arranged like spokes around a single throw of the crank — so every one meets clean air.
Spooling up…
- 1Cooling fins, each jug
- 2Single crank throw (hub)
Data plate
- Cylinders
- Nine, single row
- Cooling
- Air, over barrel fins
- Firing order
- Every other cylinder
- Before start
- Pull through for lock
Pilot’s notes
With the jugs splayed out radially, each finned barrel sits directly in the slipstream, which is how a radial sheds its heat without a drop of coolant. Oil drains into the bottom cylinders when it sits, so you pull the prop through by hand before a start to clear any hydraulic lock before it bends a connecting rod.
Airmanship · watch for
Hydraulic lock
Oil pooled in a lower cylinder will not compress — turn the prop by hand first, and if a blade stops solid, stop and drain it rather than force it.
Take it further
Read the deeper logbook guides, compare vetted gear, or carry it as original merch in the shop.