Hallberg-Rassy
HR Monsun 31
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Photo being verified
We are confirming an exact hull photo for this model. Specifications and survey notes are complete.
On the live HR Monsun 31 card the overview already names Olle Enderlein and about 904 hulls, but still sells the plate as 9.4 m / 3 m / ~5200 kg. The chips below already hold another set: 1974–1982, LOA 9.36 m, beam 2.87 m. In the related strip the designer suddenly becomes Olle Bergh. Until overview stops arguing with the chips, and related stops arguing with overview, you are not yet looking at a consistent Monsun 31 this page is about.
The model is Olle Enderlein for Hallberg-Rassy (Sweden), the yard's best-seller with 904 hulls (yard). Plate: LOA 9.36 m, LWL 7.50 m, beam 2.87 m, draft 1.40 m, displacement about 4.2 t, keel about 1.9 t in a GRP pocket. The yard writes production 1973–1982; the chip starts at 1974 - teach the fork, do not erase 904. Keep live survey strengths (chainplates, cockpit teak, wiring, moisture at the encapsulated keel); close the wrong Bergh and the 9.4/3/~5200 plate. We do not invent an asking price.
At a glance
Quick facts
- Production
- 1974-1982
- LOA
- 9.36 m
- Beam
- 2.87 m
- Model
- HR Monsun 31
Key takeaways
- Best for: pocket Nordic cruiser with loyal following
- Common issue: chainplates and standing rigging calendar age
- Typical price: classic HR entry - invoices beat cosmetic refresh
Technical data
- Length overall (LOA)
- 9.36 m
- Beam
- 2.87 m
- L/B
- 3.26
- Production years
- 1974-1982
Calculations and ratios
Brochure numbers need matching units. Open a FairHelm formula page for the classical form, rule of thumb, and limits before you compare listings.
Design history
On survey check chainplate bedding and bulkhead stains, standing-rigging age by invoices, teak coamings, the wiring loom, and moisture paths at the encapsulated keel - the live checklist is already close, but without the 9.36/2.87/7.50 plate and the name Enderlein it is about another boat.
Typical problems
We close live overview 9.4 / 3 / ~5200 and related Olle Bergh against chips 1974–1982 / 9.36 / 2.87, yard Enderlein / 904 / LWL 7.50 / 4.2 t and the start-year fork 1973 vs 1974.
Annual ownership costs
Read kronor annual bands as a marina class around 9–10 m, not a yard offer. We do not invent an asking price.
Calculators for this boat
Indicative figure for weekend use. The country supplies berth and winter. The insurance line stays the Swedish planning band - not a Danish, German, or Dutch premium. Maintenance stays Swedish too. Not a marina quote.
- Netherlands (annual contract)€3,700 - €6,312
- Sweden (planning bands)€4,950 - €8,550
- Denmark (two harbours, season)€3,771 - €6,191
Antifouling
Litres need waterline length and draft. This page only has length overall and beam, so litres are not calculated here.
Open the antifouling calculatorWetted surfaceSail planAll calculators
Pre-purchase survey checklist
Beside this page: HR 29 and HR 312. Their opens are not cloned here: first fix the overview plate and the Bergh related strip to the chips and the yard Monsun.
Expert verdict
FairHelm rating: 8.0/10: Beloved Nordic pocket cruiser; buy on chainplates and rigging age, not brochure nostalgia.
Vadim Nareyko, FairHelm Editorial, Last reviewed: 2026-06-13