🚤 Turn Fin
A small fin mounted near the propeller that helps a boat corner cleanly at speed instead of spinning out or "blowing over."
What it actually does
A turn fin is the blade mounted on the side of a fast boat's hull that bites the water in a turn and stops the boat sliding sideways. Without one, a high-speed boat will not turn predictably at all — it simply skates.
In practice
Position, depth and angle all matter. A fin too deep adds drag on the straights; too shallow and the boat loses grip mid-turn. Most fast boats turn better in one direction than the other because the fin is on one side only, which is why racing courses run one way.
Worth knowing
Turn fins are sharp and they take real load. Check the mounting after every hard turn or crash — a fin that folds mid-corner ends the run.
Related terms
What a free account actually does
RC Crash Crew remembers your RC so you don't have to. Every run, every battery cycle, every breakage and every fix — kept with the rig it happened to, for as long as you own it. No cost, no advert, no catch.
🏎️ Your garage — the part that works on day one
Build each rig properly: what motor, what ESC, what gearing, what tires. Then keep its whole history in one place.
- Run log — where, how long, how it went
- Battery health — cycles, puffing, when to retire it
- Component hours — what is worn out before it fails
- Setup sheets you can copy between rigs
- Radios and model memory
- Photos, kept with the rig
🔧 When it breaks — and it will
The bit people actually search for at 9pm with a broken car on the bench.
- Crash Bay — log the damage, see what other people broke
- Repair Desk — what you did, and whether it held
- Tune — symptom in, fix out, by chassis type
- RC AI that can see your own rigs and answer about them
📍 Where to run, and what is near you
Tracks, bash spots and hobby shops, on a map, across 28 countries.
- 505 run spots
- 370 hobby shops
- Race nights and events
- Add the ones we are missing — most towns are still blank
📚 Learn it properly, free, no sign-up needed
544 things explained — and none of it is a two-line stub.
- 27 full guides, averaging 1.450 words each
- 466 glossary terms
- A wiki any trusted member can correct
- 195 models and 142 parts on file
Straight with you: the site is new and the crew is small. The tools, the guides, the map and the 505 run spots are all here and working today — the people are what is still missing. If you want a garage that remembers everything, it works from your first run. If you want a busy forum, come back later, or be one of the reasons it gets busy.