Close this search box.

8 recurring technical problems on catamarans that Karver can help you solve

If you sail aboard a sailing catamaran on a regular basis, you have most certainly met all or part of the problems related to the deck equipment that we are going to list now.

Everyone knows it, the absence of heel of the catamarans does not make it possible to be naturally alerted that it is time to reduce the sails. Consequences: the efforts in the rigging are significant and suitable deck equipment request suited loads. Multihulls habitability and comfort also make them very popular for long trips. Intensive use is an important additional factor that puts strain on the various equipment on board, deck equipment included.

1- My reef lines are breaking

On a multihull, it is not uncommon to spend more time with one reef in the mainsail than with the full mainsail. The reefing line is very stressed and if you don’t take the trouble to move the wear points, it will eventually break.
Karver Solution: Replace traditional reefing lines with KHR reefing hooks. If there is a hook to install on board, this is the one to choose. The use of a lock makes it possible to eliminate the high load jammers and to use a basic rope of smaller diameter, no more reef line length to manage. If the choice of the KHR is made at the early design of the boat, its use also becomes a budgetary saving. KHR video.


2- My halyards are slipping in the jammers. Covers wear out quickly.

If you meet this problem, the jammer is not suitable. That doesn’t mean it’s a bad product though. The loads are just too high, and the jammer does not have the capacity to handle this load. This is what leads some shipyards to use a 2:1 sheaved halyard to divide the forces or to use halyards with larger diameters or better quality.
Karver solution: we have designed a KJ 3-jaw high load jammer (which has won several innovation awards) with a conical shape. The design of these jaws makes it possible to hold the rope over 360° without flattening it and over a large surface. Thanks to the use of the conical shape, the more it pulls, the more it holds! 3 other major advantages to this market benchmark: 1) The KJ can be controlled remotely. 2) The entire cone separates from its support without tools for quick and easy cleaning. 3) Several shipyards integrate the cone directly into the deck, the mast, the boom, etc. to clear the deck or get closer to the element to be checked and reduce the stretch of the ropes. KJ video.


3- I can’t find satisfactory solutions for the use of a staysail.

Several brands have chosen to have a staysail permanently in position, but this means accepting the inconvenience caused when you want to tack or gybe, the presence of weights permanently in the upper parts of the boat and the obstruction of the deck plan.
Karver solution: Although we are able to offer a staysail furler (KRS), we advocate the use of a removable staysail on a textile forestay and on a flying furler (KF). This solution is 8 to 10 times lighter than a conventional headsail reefing furler. Installation is simple. The sail is rolled up and can stay in position for several days if necessary. If you already have a furler on board for your gennaker or any other sail, it is usually possible to use it and will allow you to furl/unfurl your sail safely from the cockpit. If it is quite possible to use a halyard to obtain sufficient tension, we recommend the use of a lock (KMH: internal or KFH: external). The lock avoids the use of a high-load halyard jammer, a top-of-the-range halyard and above all makes it possible to eliminate the elasticity of the halyard which results in a slack luff (sag or luff sag) and a sail not very efficient when slacking. In addition, it is also possible to use our KJSK staysail tensioning kit. This is a product that incorporates the high load jammer, the sheaves for the 3:1 purchase and the deck attachment system. When the staysail no longer has its place on deck, it is stowed with its purchase and jammer. The deck is completely clear.


4- I have to climb up to the halyard point of my mainsail to disconnect and store my square top batten in its lazzy bag.

A large proportion of catamarans are fitted with a square-headed mainsail in order to increase the sail area in light winds in order to avoid the use of engines as much as possible. The geometry of square-headed mainsails does not allow them to be easily stored in a lazzy bag. In many cases, you must climb up to the top batten and disconnect it manually.
Karver solution: we have designed a gaff lock (KGL) which can be adapted to many headboard cars models (Harken, Antal, Z, …). It is a simple and reliable system fitted with a 2:1 halyard sheave. The easiest way is to watch the video to understand how it works. Gaff lock video.


5- My genoa headsail furler gets damaged quickly and/or is hard to use.

A catamaran is naturally less rigid than a monohull and the reefing furlers are therefore subject to more stress. In addition, the course of the furling line is more complex with sometimes large angles which bring a lot of friction.
Karver solution: Use our new KRS headsail reefing furler and its very low friction furling line blocks. The KRS headsail reefing furler has been (eco)designed to be tougher than our competitors. Drums are wider to reduce the efforts during furling. Blocks for the passage of the line are real bearing blocks which reduce friction. Finally, it is a full options headsail reefing furler with black anodized elliptical profiles.


6- The maneuvers friction is tough.

At a time when many shipyards are talking about “easy sailing” and imagining sophisticated systems to automate, motorize or electrify our operations, we recommend taking particular care to eliminate friction. Each return angle of a halyard, a sheet, a sheave is a potential source of friction.
Karver Solution: Replace the basic sheaves (no bearing or friction bearing) with ball bearings sheaves. Using our KDS sheaves, KBO or KBR blocks is a good start. Use our KSO fairlead organizers instead? Align the furling lines using our KRO open rings. Run furling lines with our KBS stanchion blocks. For units up to 45 to 50 feet, the use of our KPW winches makes it possible to divide the effort by 3. This attention to every detail will allow you to avoid the use of electric winches and find pleasure in operating. KPW winch video.


7- My dinghy is hard to pull up on davits.

If you are unable to use the sheet winches to raise your dinghy, it is likely that you will need to use winches dedicated to the davits. These winches are often sized in relation to the low load to be lifted and require a lot of effort.
Karver solution: Replace all size 16 to 40 winches with our KCW45. The Compact KCW45 has the dimensions of a size 20 winch but the power of a size 45. For larger units, using a KPW winch makes it even more relevant. The KPW is also amazing for pulling up daggerboards effortlessly. KCW winch video.


8- My halyards twist

Given the sail surfaces and workloads, the halyards are often 2:1 and sometimes even 3:1. 3 disadvantages to this practice: 1) You take 2 or 3 times longer to hoist the sail. 2) Once hoisted, you end up with a big pile of rope that you must wrap and store. 3) The halyards sometimes twist to the point of blocking the sails at the masthead.
Karver Solutions: Our best advice is to go back to simple halyards (1:1) probably a little more technical and more expensive with our KJ jammers or to use locks when possible. Another solution if you are attached to the use of halyards: install one of our small eye-eye swivels at the mast head.


We could complete the list with solutions to less frequent or less important problems. Contact us and share your issues. We are always very happy to be able to provide solutions. Come and meet us in our agencies in Honfleur (head office) or Lorient (sales department / showroom) or at boat shows.

The International Multihull / Multihull Boat Show will open its doors from April 12 to 16 and again this year Karver will be present.

Article written by Tanguy de Larminat. Tanguy is the managing director of Karver. It is also a specialist in cruising multihulls. He is a professional sailing instructor and skipper. He has several transatlantic crossings in catamarans to his credit and managed Catana’s customer service (deliveries & after-sales service) for 4 years as well as a refit yard for 12 years in the south of France.

Pays de livraison

Les prix et les disponibilités des produits varient en fonction de l’adresse de livraison.
Veuillez sélectionner votre pays afin d’ajuster ces informations :

Country delivery

Prices and availability of products vary depending on the delivery address.
Please select your country to adjust this information:

: 1. Article one: Contract formation 1.1 Conflict between general terms and conditions of sale and general terms and conditions of purchase: The present general conditions of sale define the terms of execution and the conditions of sale between KARVER and its customers. To place an order implies a full and complete adhesion to the general conditions of sale described below. Sales are always made by mutual agreement between the parties as set forth below. These provisions cannot be modified by contrary stipulations contained in the general conditions of purchase of the customer or any other document without written agreement of the parts. 1.2. Consent: 1.2.1. Offer: Karver products’ offers accomplished by quotations can only be valid if they have been accepted in the indicated delay. All offer made by Karver will only become irrevocable after written confirmation by Karver to the client’s purchase order. 1.2.2. Acceptance: this can be done according to the forms and uses in force in commercial matters and in particular by mail, fax, telephone, internet or e-mail. 1.3. Cancellation: any request for cancellation of an order for any reason whatsoever may be examined only by payment of a cancellation indemnity set at fifteen percent (15%) of the net price excluding tax of the order. For custom orders, deposits will not be refunded. 2. Article two: Sold goods KARVER reserves the right to apply at any time any modification that it deems useful to its products without prior notice 3. Article three: Settlement terms 3.1. Terms of payment: The invoices are payable at the headquarters of KARVER Honfleur by credit card or wire transfer. 3.2. Payment period: 3.2.1. Principle of the will of the parties: The payment periods can be set freely by the parties but cannot exceed 60 days. 3.2.2. 30-day payment: The payment of KARVER products by customers who already have an account with KARVER is made on the thirtieth day following the date of receipt of the goods (Article L.144-6 of the French Commercial Code). 3.2.3. Special deadlines: Payment for Karver products ordered by new customers or customers who do not have an account with KARVER will be made in full payment before shipping. 3.3. Late payment penalties: 3.3.1. Methods of calculation: The sums not paid at the due date will result in the payment of monthly indemnities equal to 5 times the legal interest rate on the amount of the sum due, the payment of the totality of the remaining will stay due and deliveries will be suspended. In addition, a lump sum compensation for recovery costs of 40 euros is applied in accordance with Decree No. 2012-1115 of 2 October 2012 for any late payment over 10 days. 3.3.2. Late payment penalties are applied if the sums due are paid after the payment date shown on the invoice. Penalties are due without any reminder being necessary. They run automatically on the day following the date of payment on the invoice, or failing this, on the thirty-first day following the date of receipt of the goods. 3.4. Discount for upfront payments: There would be no additional discount for payment granted before shipping. 3.5. In the event of cessation of payment, bankruptcy filing, settlement or declaratory judgment against the client, the latter shall notify KARVER without delay so that an identification and an inventory of Karver products sold but not yet fully paid and cashed can be established and that the ownership clause can potentially be established. 3.6. In case of unpaid of all or part of a term, KARVER, without losing any of its rights may require the return of all products corresponding to orders not yet paid. 3.7. Karver may claim in the hands of the sub-purchasers the price or part of the price of products sold by Karver to the customer which have not been fully paid or cashed. In this case the customer agrees to provide any relevant information regarding to the sub-purchasers. 4. Article four: Price schedules, discounts and rebates 4.1. Prices: prices are “ex works”, packaging included, at the rate in force at the time of the order. Karver reserves the right to modify its rates according to currency fluctuations, raw materials or cost price. 5. Article five: Orders 5.1. The general conditions of sale apply to all sales, by signing the order, the customer accepts unconditionally the conditions of sale and waives any application of its General Conditions of Purchase. 5.2. Our orders are final from the moment they are confirmed in writing. Any modification can be taken into account only if it arrives in writing before the shipment of the products. In case of order modification our deadlines can be postponed. Similarly, if our buyer does not accept the change, the down payments will not be returned. 5.3. In case of late payment KARVER may suspend all outstanding orders without prejudice or any other actions. 6. Article six: Jurisdiction For all disputes relating to sales made by Karver and the application or interpretation of these Terms and Conditions of Sale, only the Commercial Court of Lisieux (France, 14) will be competent. 7. Article seven: Force Majeure KARVER is not liable in the event of fire, flood, interruption of supply of energy, raw materials or spare parts, as well as total or partial strikes of any kind impeding the smooth running of the company, such as transport strikes, postal services … The occurrence of a case of force majeure has the effect of suspending the execution of the contractual obligations of KARVER. 8. Article eight: OWNERSHIP RESERVE CLAUSE : 8.1. KARVER expressly reserves the ownership of the KARVER products delivered and designated in the sales contract until full payment of their price in principal and interest. 8.2. The goods will remain the property of KARVER until full payment of their price, but the buyer is responsible for them as soon as they are physically delivered, the transfer of possession entails the transfer of the risks as well. Signing this document, the buyer undertakes to subscribe an insurance contract guaranteeing the risk of loss, theft or destruction of the goods. 8.3. The transfer to the buyer, the disadvantages, the risks of loss or the deterioration of the products are subject to the retention of title. In case of application of the reserve of the property after the partial payment, the installments paid will be our property in counterpart of the depreciation undergone by the products. 9. Article nine: Delivery, receipt, returns 9.1. Receipt of products 9.1.1. KARVER deliveries are made by private carriers mandated by Karver at the expense of our customers. In the case of a carrier mandated by our customer, the goods will be transported at the expense and risk of it. 9.1.2. In case of apparent defect or failure the customer will have to make findings and reservations with his postal services on the transport receipt. 9.1.3. Deliveries can only be made if KARVER’s clients are up to date with their obligations. 9.1.4. Lateness cannot entail a cancellation of an order or any claim for damages. 9.1.5. All claims regarding apparent defective and non-conformity of products must be received within 8 days of delivery of the products. The client must then provide all the justifications on the reality of the defect and leave to KARVER any possibility to note the defect itself and to remedy it. 9.2. Delivery times Delivery times are given for information only and without guarantee. A delay does not entitle the buyer to cancel the sale, to refuse the goods or to receive damages. 9.3. Returns No return of Karver products can be made by the customer without the express written consent of KARVER. Returning costs will be borne by KARVER only in the event that an apparent defect is actually noted by the latter. Unless prior authorization, only the carrier chosen by KARVER is authorized to return the products concerned. 10. Article ten: The lack of conformity of the goods 10.1. The goods travel at the risk of the customer to whom it belongs to check the good condition at the time of delivery. This verification must relate to the quality, quantities and references of the goods and their conformity with the order. No claim will be taken into account after a period of fifteen days from the day of delivery. 10.2. Goods with a recognized defect of conformity, reported within 8 days, is subject to replacement or restoration, to the exclusion of any compensation, for any reason whatsoever. 11. Article eleven: Warranty Karver products are warranted for pre-sale defects making our material unsuitable for the intended use or which reduce such use so much that the buyer would not have acquired it or will not would have given a lower price if he had known them, in accordance with the provisions of articles 1641 and following of the civil code. The customer can only benefit from the guarantee if he notifies KARVER by registered letter as soon as possible. 11.1. Contractual Warranty: Karver products are warranted against defects in material or confection for a period of one (1) year from the date of delivery to the Professional Customers and two (2) years to the Private Customers from the date of sale. Under this warranty, the only obligation incumbent upon KARVER will be the free replacement or repair of the product or item found to be defective by its services to the exclusion of any other indemnity or damage and interest, the possible shipping costs being the responsibility of the customer. Defects and deteriorations caused by natural wear and tear, by an external event (product not adapted to real loads, assembly not conforming to the technical instructions of KARVER, defective maintenance, abnormal use or in competition …) or by a modification of the product not specified or specified by KARVER are excluded from the warranty. In the same way the guarantee will not play for the visible defects. 11.2. Legal guarantee: Under the guarantee of hidden defects, KARVER will only have to replace without charge the defective products excluding the repair of any other damage, shipping costs will be paid by the customer. 12. Article twelve: Use of the products Our buyers declare to have all the technical competences, to have taken note of our documentation to have been perfectly informed on the use, the handling, the dangers of the products and in case of doubts to appeal to one of our technicians. No other warranty than those contained in our documentation will be able to be declared to the customers. 13. Article thirteen: Custom, customized products: For professionals, our custom products are designed with their technical teams and meet the specific instructions that are communicated to them by them. Therefore, they are excluded from any warranty and their sale is made at the risk of the buyer who cannot, in particular, invoke a hidden defect. 14. Article fourteen : Spare parts: The duration of availability of our spare parts is at least 3 years from the date of purchase by the private customer. This indication is included in our user manuals.


Register our newsletter :