Thanks for the answer to my question Bernd.

It has been my experience that limber holes are needed for bilge water to drain to the lowest point in each compartment so it can be easily removed.

I worked as a Shipwright building timber monohulls from 1973 to 1981 and have seen the condition of many of them after all these years. The epoxy/timber boats with good ventilation have had the longest life. Some of them look almost new on the inside after 45-years.

One common problem I have seen on the boats with poor ventilation is mildew on the inside surfaces. The boats with good ventilation did not generally have this problem. The main way we installed adequate ventilation was to ensure each compartment had at least two openings (ventilators or hatches) to the outside of the hull. Lockers and cabinets also need at least 2 openings for adequate airflow to the inside of the hull to stop condensation and mildew. When faced with watertight bulkheads, we installed a low inspection port and a deck ventilator or hatch to induce air flow through the compartment. Both the inspection port and the ventilator would normally be closed when underway to provide watertight integrity.

Over the long life of these boats, epoxy slowly absorbed water. I know this because of the slight discoloration of the timber under the epoxy where bilge water was left. By inducing good ventilation, bilge water evaporates and there is minimal absorbtion of water into the epoxy. Dry wood is stronger and less likely to rot.

Here is a real-life example of the situation. One boat I built in 1977 of cold molded Western Redcedar, okoume plywood and Sitka spruce was sweet smelling with zero rot or mildew until it suddenly began having problems after 27-years. Mildew damaged the inside paint and there were a few small areas of rot in 2 deck beams and a small area of plywood decking. All of these problems were in the forward 1/3 of the hull. The problem developed because the owner closed off the forward cowl ventilator and kept the forward hatch closed tight when moored. The two aft ventilators and companionway vent kept the after portion of the boat in good condition. Closing off all ventilation forward caused the problem. After repairs, the owner keeps the ventilation open forward when moored. 16-years later, he has not had any more problems.

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stephane blanchette?
montreal canada kd860

Hi Bernd, no I didn't receive them. I have asked Stephane to send them. Thankyou very much and stay safe.

Did you received the drawings? I have big problems with my internet connection. If not ask Stephan to send you the relevant drawings
Stephan I permit you to send the necessary drawings

Bernd

Hi Stephanie, Thanks for your reply Bernd is trying to send them to me.

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Hi Bernd, no I did not receive them. I have have checked in spam etc but don't have them. Can you please try again.
Thanks Bernd
Craig

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stephane blanchette?
montreal canada kd860

You got the drawings or? I was sending them 3 days ago.?
Bernd

Hi David

No holes were not absolutely necessary. If good in the epoxy and the area is closed on a try day, no proplems over a long time periode.

Bernd

Hello 860 builders. I am rebuilding my mast and my rigger who will supply all parts needs the mast and sail drawings. I have misplaced my plans. Can someone please take photos of these two plan sheets and send them to me. It will be very helpful. I am unable to download the plans files atm.
Thanks in advance
Craig

Both Dominico and Zee have wonderful photos of DUO 900 builds. The hulls do not seem to have limber holes in the bilges or ventilation cutouts in the bulkheads. Is this per plan? I can't imagine a timber boat having a long life without these features even when epoxy coated.

David

The following photos have been uploaded to the DUO 800S Australia album of the [email protected] group.

• DF03CCAF-5FBB-4779-B520-95465E865514.jpeg
• 69F01907-544E-4139-B0BB-D4C8C9B0857D.jpeg

By: Zee

Added other new photos of the Kd Duo900 Italy
/g/K-designs-Multihull-Sailboats/album?id=256248

He'll Bernd & everyone, I am about to re ring my mast and cannot find the plan drawing. The rigger who is supplying all the gear needs the plan drawings. As I'm working from a phone atm could someone take photos and send them to me please. I won't be able to download files.
Thanks for your time.?
Regards Craig

Hi Domenico

You are a hard worker. Is it still warm enough to work outside?
Give me a reason, why you do not like the Aluminium beams.?
I am busy to draw the wood/carbon?glass fiber beams. But I?
can tell you one thing. The mast beam is more complicated as a hull

Cheers

Bernd