Mini40 / F48 Class Trimaran foiling trials - RC Groups
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Jun 20, 2013, 08:53 PM
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Mini40 / F48 Class Trimaran foiling trials

My FireDragon Mini40 Class Trimaran foiling on new laminar foils and a new wing on the rudder compared with my turbulent foils.

The FireDragon with the new laminar foils:

FireDragon - New Foils and new Wing on Rudder Clip1 19.6.2013 (4 min 59 sec)

FireDragon - New Foils and new Wing on Rudder Clip3 19.6.2013 (1 min 52 sec)

The FireDragon with my old turbulent foils:

FireDragon - Proven Foils and new Wing on Rudder Clip3 20.6.2013 (1 min 51 sec)

FireDragon - Proven Foils and new Wing on Rudder Clip1 20.6.2013 (2 min 17 sec)

Have fun watching and make your decision on which foils work better


Last edited by Multihull; Jun 20, 2013 at 09:17 PM.
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Jun 20, 2013, 10:36 PM
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John Xman's Avatar

More info please!

Can we see some up close photos of the foils and how the new ones compare to the first set? Thanks

John Xman - AC-86 Build
Jul 11, 2013, 08:29 AM
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How much sail area do the 40's and 48s have?
Oct 04, 2017, 01:10 AM
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I have made available free self builder plans for the FireDragon1000 a MultiONE Trimaran in the Plans section of RCSails Shop.

Oct 04, 2017, 09:04 AM
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Dick L.'s Avatar
Thanks Roland

Have sent a lot of people to your site with few if any results of on the water boats. Will see if this makes a change.

Oct 04, 2017, 04:36 PM
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Dick L.'s Avatar
Originally Posted by JIM CALDWELLA
How much sail area do the 40's and 48s have?

Hi Jim - didn't see your post so not sure if it has been answered. If it has, sorry for duplication.

Regards, Dick Lemke

SAILS - F48 -
D-1...The sail area will be limited to a calculated area of 0.9 m2 (1394.00 square inches reference).
Last edited by Dick L.; Oct 04, 2017 at 06:47 PM.
Oct 05, 2017, 07:04 AM
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Thanks Dick, but I found it elsewhere. I just checked, the cat floats, but the wind quit as we were launching. I got up to 1 knot on GPS! LOL
Oct 05, 2017, 02:52 PM
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Dick L.'s Avatar
Almost ready to start refurbish/rebuild on my MultiONE that former owner trashed a bit.
Oct 12, 2017, 08:03 PM
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Dick L.'s Avatar

Copy the above URL and paste into your browser if it doesn't open when clicking on it.

Starting to get the hang of foils and foiling. Would be nice to see similar development all over including the US.
Oct 13, 2017, 07:34 AM
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DLord's Avatar


Dick, seems like it might be one of the first good wand systems since the F3 and the first good one on a cat? Impressive...
PS-Haven't been able to tell whether the wands move the whole foil or a flap?
Oct 13, 2017, 10:10 AM
The wind is free, go sailing!
Scratchy101's Avatar
Originally Posted by Dick L.

Copy the above URL and paste into your browser if it doesn't open when clicking on it.
"Mini 40" - Burhave 2017 (18 min 2 sec)
Latest blog entry: My DC6 Sailing and Mods
Oct 13, 2017, 12:03 PM
Is that the same Michael Scharmer from the skinny IOM development? Wow, he makes amazing boats and videos to boot. Next level control getting onto and off the foils. I see there are wands next to each hull foil. That seems to help with stability flying a hull too, but it's hard to tell from the video. It almost never develops a bow down attitude and often has the opposite.

Pretty amazing use of a drone for camera work as well I think.
Oct 13, 2017, 01:44 PM
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Dick L.'s Avatar
The concept pretty much follows the efforts Doug Lord developed and incorporated into his foiling trimaran back in early 2000's !

I had the fortune to sail one belonging to a local sailor and was impressed there still was only 2 controls required....sail control and steering. All sailing functions as well as foiling controls were self tending. Tacked and gybed well, sailed to windward and no problems with nose-diving. Good wind and flat water allowed me to tack upwind without dropping off the foils.
Oct 13, 2017, 07:31 PM
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DLord's Avatar


Thanks again, Dick! For those who haven't seen the F3 which was designed and the tooling built in 2000 here are some pictures and specs:
LOA 56"
Beam 72"
Weight 7.5lb
Takeoff wind speed =5mph -----Top speed in 5 mph breeze=12mph
Fastest speed with reefed rig in 22mph breeze=18mph (she was faster in less breeze!)
Biggest advantage of this design: the foils automatically provide all the righting moment for the boat.

Old video--about all thats left:
Advanced RC Designs by Doug Lord (1 min 7 sec)

Last edited by DLord; Oct 13, 2017 at 07:42 PM.
Oct 20, 2017, 08:10 AM
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DLord's Avatar

F3--why so much beam?

The F3 uses dual, independent wand control of the main foils. What this means in practice is that , in addition to the vertical lift required to fly, the wands move differentionally with the slightest heel which causes the foils to develop righting moment. The beam of the F3 is oversquare to give nearly maximum separation of the main foils. This reduces drag on the foils when generating RM compared to a wand based boat with a narrower platform.

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