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Stuffing tube

Name: Stuffing tube dimension sheet
Creator: Xem Studio
License: https://creativecommons.org/licenses/by/4.0/

What is a stuffing tube and how should it be routed? · Standard part · basis: Design rules and figures from the cited sources; example geometry by Xem Studio

Also called: rc boat stuffing tube, flex shaft tube, stuffing tube angle, stuffing tube seal, drive tube, shaft tube rc boat, stuffing box

Exact dimensions. True size, with no printing tolerance added.

sizes: 2 in table

Notes

The stuffing tube carries the flex shaft from motor to strut through the hull and keeps water out. Keep it as straight as possible from hull exit to strut (Model Gas Boats).
One RC mono uses a 7 mm x 210 mm tube with 31 mm exiting the transom; strut offset creates a slight S-bend (SV Design; Model Gas Boats forum).

Stuffing tube size chart

parameter	value or range	source
Stock tube	7 mm dia x 210 mm, 31 mm exit	SV Design (Stealthwake)
Exit target	up to 57 mm (~10% of length)	SV Design (Stealthwake)

Where the files are

Other publishers' files are linked, not hosted. "verify" = check the license at the link before commercial use.

Model Gas Boats	Some tips on setting up a hydroplane hull	web	Publisher's page; dimensions are facts
SV Design	Pro Boat Stealthwake upgrades info (Feb 2022)	web	Publisher's page; dimensions are facts
Model Gas Boats forum	Need help setting up a mono for the first time	web	Publisher's page; dimensions are facts

Xem scan

File coming

No downloadable true-size file yet: the published figures do not fix the whole shape, and Xem never guesses a number. A measured scan is planned; request it and it moves up.

Let your AI pull this. Add https://xemstudio.com/mcp to Claude, ChatGPT, Cursor or any MCP client (free, no account, one minute) and it can look up exact sizes, mating fits and free STEP/STL from every chat.

Set it up →

Plain text: sheet.txt · JSON: /api/geometry?object=stuffing-tube

Schematic, not to scale.