Snapdragon 670 Buyer's Guide
The Snapdragon 670 is a 22-foot masthead sloop first built by Thames Marine in 1963 and designed by David Feltham in-house. On the used market she appears as a small, shallow-draft twin-keeler whose 2.67-foot maximum draft and 1,450-pound ballast in a 3,240-pound hull make her a forgiving coastal camp cruiser rather than a performance boat. With no production-end year on record and a builder that ceased trading in 1981, surviving examples are now several decades old and deserve a careful look beneath the gelcoat.
What to Inspect
The twin-keel attachment is the feature that warrants a buyer's attention: because the ballast is split into two external foils rather than a single fin, each keel root is a separate hull penetration carrying a large share of the 1,450-pound ballast load. On a fiberglass hull, examine both keel-to-hull joints for hairline crazing, rust staining from ballast, or movement when the boat is lifted. The fiberglass construction itself should be sounded for softness, particularly around the keel roots and the chainplate areas where the masthead rig's 238 square feet of sail load enters the deck. The 22-foot overall length and 8-foot beam confirm she is a pocket cruiser, so check the deck for aged gelcoat crazing and the mast step for compression. Her 5.84-knot hull speed reflects the 19-foot waterline, a useful reference when assessing whether engine or rig upgrades have been attempted. Beyond those keel roots, standard age-related checks apply rather than model-specific faults.
Buyer's Takeaway
- Sound both keel roots for delamination or movement
- Check chainplate beds for deck cracking under rig load
- Confirm the trailer and mast-step condition before towing
- Verify the bilge is dry given the twin-keel ballast
- Inspect deck gelcoat and mast step for age-related wear
- Note hull speed limit when judging any claimed upgrades
Price & volume trends
Monthly asking-price and listing-volume trends for the Snapdragon 670. The line shows the median ask each month; the bars show how many listings appeared.
Monthly breakdown · 2 rows
| Month | Listings | Median ask | Δ vs. last mo. |
|---|---|---|---|
| Sep 25 | 1 | $5,172 | — |
| Oct 25 | 1 | $3,846 | -25.6% |
Comparable models
Similar length, displacement, and era. Open a row to compare that model's market page.
Similar boats to compare
2 similar designs| Model | LOA | Median ask | Listings · 12 mo | Active · 90 d |
|---|---|---|---|---|
| Sabre Yachts 27 | 27' | $ 5,968 | 10 | 1 |
| Westerly Centaur 26 | 26' | $ 6,798 | 8 | 2 |