Multihull Plans

Hello all! I have just recently become interested in RC sailing as i have recently moved and no longer get to sail “the real thing.” I have been looking over these forums as well as the ones at There are many links to plans for Freight Train, Ghost Train, Snapdraggon, Water Resist, Nightmare the box trimaran, however nearly all of those links are broken or no longer exist. When i look at the dates, most were posted in 2003 or earlier - can anyone provide current working links of the best plans available out there (or simply the plans themselves)? I would greatly appreciate it, as would other “newbies” i’m sure!

Thanks in advance!

Look to the Multihulls section of the forum.

Here is link to Alan Hayes web page - scroll down and you will see the multihull plans (at no cost)kindly provided/sponsored by Alan.

The WATER RESIST plans can be found here:

And are available by email request from the designer/builder - Jean Margail.

FREIGHT TRAIN and SNAPDRAGON are plans only available for a fee ( around $13.00 US as I recall) and must be ordered thru TRAPLET PUBLICATIONS. They never were available on-line.

NIGHTMARE was/is (?) available from Ian Sammis - He origiinally was in Kansas, moved to California, and last I heard he was back in Kansas. No plans - but he builds and sells hulls, beams or complete boats - all are in carbon and follow the lines/features of the yellow/blue Nightmare noted on the AMYA pages. Perhaps other readers may know how to contact him?

BOX BOATare just drawings - no instructions on a (more or less) box style hulls which are easy to assemble/build and don’t require a heavy effort to build curved stations. Do an archive search in Multihulls for “Idealist” - as I recall, he promoted his photos site where the drawings are located.

PULSE is a UK 1999 Championship boat, but only for plans purchase. I have an agreement with the deisgner to reimburse him a royalty for any that I sell.

IMPULSE is a one meter design to fit the MultiONE class and was designed to be either tri or cat. It was also designed to be made from foam. Use 2 center hulls for cat config, or one main hull and two floats for tri. No plans or instructions, just general cross section lins and template spacing. It “could” also be built using balsa and light glass.

Thanks for the information - that clears up a few of my options at very least. Any idea what the cost would be on plans for Pulse? (These would be plans to produce the boat on your picture site by jack ronda, correct?) What amount of detail can i expect to find on them?

Any comments on what might be the best direction to proceed? I plan on doing glass over foam (possibly remove the foam) as i have done for floats on an RC plane.

Thanks again for your help!

These are the lines for PULSE. I will have to check at Kinkos, as the drawings are in DWG format. Royalty is $7.00 (or was) and as I recall, Kinkos charges around $10.00 for a 3 x 5 foot drawing, plus postage.

If you can accept DWG and open/print your own, then cost is $8.00 ($7 for royalty plus postage to UK) Yes - it is the boat that Jack Ronda built at the 1 Meter size.

For a foam build - any of the plans will work. Just need to clean out room for radio board… and sheeting system if you keep it below decks. If you rin sheeting above decks, then most of the foam could remain - albeit a bit heavier in total weight.

Is there any place i can get more info & see more pictures of Jack Ronda’s boat (or one built with these plans?) I’d like to gather a little more information before committing to one plan. I am having trouble finding build instructions on the internet or in books (there is an abundance of this kind of info for RC Planes.) I’m trying to walk through the process in my head in effort to plan out each step. Certainly problems will arise but i’d like to prevent as many as possible before i get half-way into this!

OK -

first - visit AMYA website, go to US1Meter Class page and download their Construction Hints and Tips. While these deal with a 1 Meter monohull - they can be easily modified to handle any size boat -bif or small, and any number of hulls. Remember, you are really building 3 hulls instead of 1. You can use the same idea of station templates, and fill between with foam like I did on IMPULSE 1 meter trimaran. Not only do they do a great job of how to build hulls, but also how to rig boat, sails, keel. dagger boards, rudders, and winch setups. I would also encourage you to join AMYA just because this kind of info is so valuable and saves a scratch builder so much time.

Here are photos Jack provided to me upon completion of his 1 Meter…

You will need to do a search in archives as Jack provided a bit of detail in text format of his build… don’t remember if under his name or mine.

EDIT: ADDED ----> and then go to post number 5 where he explains construction. For some reason the photos are gone - sorry, but the board has been updated and hacked a couple of times.

A few more - can only upload five files:

Pssst - – It’s out of date and never took off - but peek here …

Thanks for all the great info! I really appreciate your time and effort. I’ll re-read it all tomorrow but i was curious - how happy were you with the way your MultiONE sailed once finished. Being a (big) cat sailor i all too well can understand the issues with tacking - from the links you passed on, it sounded that he had a really difficult time tacking to the point of resorting to gybing. Is that the case with all RC tris?

Again, i appreciate your help with this. I’m doing my best to become well informed before i get in over my head. I actually downloaded and printed the One Meter Construction Guide today and read through it on the train ride home from work. Very informative - just what i was looking for.

One last thing - why do the forums appear to be a ghost town? Most of the posts are from 2004 and earlier. The RC Plane forums are hoppin’ - is this area just that much less followed?

Nate -

most builders of multihulls are monohull sailors and are used to having a boat that spins on a dime so they can have tacking duels upwind. Thus the inclination to slam the rudder over hard and then wonder why a 2-3 lb boat doesn’t go through the eye of the wind like a monohull with a lead keel 8-10 lb. boat.

If you have sailed a uni-rig cat, you know that violent movement of rudders can easily work as brakes - especially at the start line to keep from being over early. You also know to steer into a large arc to maintain boat speed and not stall rudders. As you steer through, there is a point when you can release the mainsheet to allow sails to flop to other (leeward ) side, and slowly in-haul the mainsheets to keep from being a wind-vane.

As for quiet forums - like big boats, we multihull sailors are in a definite minority. Until we get 20 members with multihulls registered, AMYA keeps us in the Open Class, and offers a little bit of space in publications. No one wants to spend $$$$ for a boat they can’t race, and again, lack of mulltihulls in local clubs doesn’t help either.

I turned my class promotion efforts in 2005 toward just getting boats on the water. Once seen and sailed against, the speed will sell itself. It’s just getting them on the water and keeping them right-side-up that needs effort. There are a few in the weeds waiting for a few more and then they will make their move and join in. The original Nightmare was in Phoenix and had a reputation of being fast even against some hot local builder’s M Class boats. It then was sold (baby was coming) and moved to Hawaii, where once again, it was beating up on 10R boats to the point no one else wanted to sail it because of it’s speed. It then moved to Australia and I’ve lost track of it.

If you look, many plans seen to favor hulls that have long flat keels whereas a bit more rocker would aid in tacking. Many designs are based on the ORMA 60’s and they are ocean racers and aren’t designed for round-the-cans racing.

In my opinion this is why they are more difficult to tack - but then, like tacking - multihulls prefer a straight line speed and few tacks, since we can cover more “ground” (water?) in a straight line while monohulls are tacking and trying to re-establish their boat speed.

If I built another prototype trimaran, I probably would opt for my mast and boards just a bit further back, and perhaps a much smaller jib (maybe 50%) instead of 3/4 or 7/8 size. It would give me a bit more weather helm, but also put a few more inches for forward buoyancy out front.