# Stuffing tube

> What is a stuffing tube and how should it be routed?

- Category: Boat design › Hull types
- Kind: Standard part
- Basis: Design rules and figures from the cited sources; example geometry by Xem Studio
- Page: https://xemstudio.com/objects/stuffing-tube/ · JSON: https://xemstudio.com/api/geometry?object=stuffing-tube · Plain text: https://xemstudio.com/objects/stuffing-tube/sheet.txt
- License: dimension sheet CC BY 4.0 (Xem Studio); files CC BY 4.0 or their publisher's license
- Use in every chat: add https://xemstudio.com/mcp as a connector (https://xemstudio.com/use-with-ai/)

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

## 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).

## Sizes

| 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

- Model Gas Boats: [Some tips on setting up a hydroplane hull](https://modelgasboats.com/magazine/tech-articles-mainmenu-608/369-hydro-setup-tips) — web — Publisher's page; dimensions are facts
- SV Design: [Pro Boat Stealthwake upgrades info (Feb 2022)](https://myplace.frontier.com/~sv_design/Pro%20Boat%20Stealthwakes%20Upgrades%20Info%20SVC_Feb-2022.pdf) — web — Publisher's page; dimensions are facts
- Model Gas Boats forum: [Need help setting up a mono for the first time](https://www.modelgasboats.com/forum/13-ask-the-editors-discuss-articles-general-boat-questions/21138-need-help-setting-up-a-mono-for-the-first-time) — web — Publisher's page; dimensions are facts

## Questions

**Seal it?**

Silicone, or let it leak for racing (Model Gas Boats forum).

## Fits with

- [Deep-V hull](https://xemstudio.com/objects/deep-v-hull/)
- [Modified-V (semi-V) hull](https://xemstudio.com/objects/modified-v-hull/)
- [Flat-bottom hull](https://xemstudio.com/objects/flat-bottom-hull/)
- [Cathedral (tri-hull)](https://xemstudio.com/objects/cathedral-tri-hull/)
- [Tunnel hull (tunnel catamaran)](https://xemstudio.com/objects/tunnel-hull-catamaran/)
- [Three-point hydroplane](https://xemstudio.com/objects/three-point-hydroplane/)