Foiling F-Boats

SailingTips.Ca

Feigns Knowledge
823
370
Victoria, BC
It's probably a combination of boredom from not sailing much due to the pandemic, plus online coverage of the America's Cup, Vendee Globe, and Jules Verne Trophy, but this all has me curious about the plausibility of full foiling kits for Farrier/Corsair boats. I mean there's a full foiling kit for the Laser, so why not?

There is a lifting foil kit for the F-85SR/F-82R on the F-Boat Store, but it's not a full foiling kit. 

It looks like the Ultime's have T-foils on the main hull and rudders, plus L-foils on the amas. There's obviously a ton of complexity with these boats that would be infeasible to translate directly a Farrier/Corsair kit, but what about something like this:

  • T-foil on main dagger board with wand-style elevator control (like Moth or Laser kit)
  • Fixed T-foil on rudder (again, like Moth or Laser kit)
  • Fixed L or C foils on amas (like F-85SR/F-82R kit)
  • Possibly fixed T-foils on aft end of amas to increase stability and/or reduce pressure on rudder?

This may be a really dumb idea, but I do take some comfort that it's at least not as dumb as this.

Flame away!!!

 

Fat Point Jack

Super Anarchist
2,417
386
Kinda like this one.










Cheekee Monkee Development


















 




2005 PHRF -42





 


November of 2004, we broke the starboard AMA right off, see Round the County story. We had four all new carbon AKAs designed and engineered by Ian Farrier, fabrication took place at Lonestar Multihills in Brownsville, Texas. This significantly strengthened the boat and reduced the weight by 85 pounds. Dave Calvert designed and built a new big roached main sail for the boat and are now racing with our lowest ever rating.





 




2003/2004 PHRF -39





 






After consulting with Ian Farrier, we removed all of the stock interior and replaced it with a carbon/nomex interior. Chart table, nav station, instrument pod starboard side. Cooler and micro galley port side. A pipe berth was installed port and starboard in the main cabin.

The forward cabin was blocked off with a carbon nomex bulkhead and a new environmentally friendly carbon/nomex head has been fabricated and installed. Access is through the foredeck hatch.

The stock aluminum bowsprit has been replaced with a carbon tube bowsprit and a new bow pulpit was designed to support it. An 85 gallon water ballast system for the transom of the main hull was installed (adds about 800 lbs). This is to prevent the boat from flipping over in high winds sailing downwind.

The forward cockpit well was removed and a new carbon structural bulkhead was installed between the aft AKA mounting pads on the main hull.

The main hull features a full length longitudinal stringer on both sides to provide hull rigidity after having removed the interior liners and bulkheads. The main hull was skinned with carbon for additional strength.

Lifting foils by Waterat have been added to the port and starboard Amas, here were are having a hard time getting the foils to drop down into the case after installation. Much sanding was required.

Net supports beams are now all carbon as I broke the 30' mast from my A Cat almost exactly in half on Labor Day in 2003.

The stock dagger board has been replaced with a new light weight, high tech, high aspect ratio dagger board that has been designed by Larry Tuttle at Water Rats in California. You can see how high it sticks up through the deck in the photo.

New PBO Navtec standing rigging was installed.

The boat was weighed with the sails, rigging and the required sailing gear to meet PIYA Category I safety requirements on board. The boat weighed 4,180 pounds. The boat lost about 200 lbs this time. Since we began in 95, the boat has lost a total of 650 lbs.







2002/2003 PHRF -21





Just in time for Swiftsure 2003, the Cheekee Monkee was sporting a main hull extended from 30’ 10” to 33’ LOA. We also replaced the stock transom hung kick up rudder with a custom transom hung dagger board style rudder much like you see on an F-25C. This rudder and assembly was designed and built by Waterat.

Changed from an 8 HP Honda to a 6 HP 2 cycle Johnson Outboard (-25 lbs).







1999/2000 PHRF -12





Upgraded the standing rigging to Kevlar from Navtec and added hydraulic cap shroud tensioners to cant the mast from side to side about 6 degrees each way.







1998/1999 PHRF -21





The first set of major changes: Removed the rubber bumpers from the main hull and the AKAs (-200 lbs), , faired the AKA's and changed to an 8 HP Honda outboard (-50 lbs).

Sold the old 40' rig, sails, instruments, everything! Installed a new 45' tall carbon rotating mast from Forespar, installed a new deck mounted carbon boom from Forespar (-100 lbs), all new sails from Calvert Sails. Overall the boat lost 350 pounds in weight.







1997/1998 PHRF +32





The first minor changes, changed from the original under hung rudder to the new stock transom hung kick up rudder (-50 lbs), added the "Mike Leneman" pushpit/mast support bracket, added a fully battened blade jib from Calvert Sails, installed the new stock F-31R 7' aluminum bow sprit and ordered a new spinnaker. As I was still a cruiser in my own mind, we added a 50 gallon built in cooler.







1995/1996





Took delivery of our new cruising multi-hull. Loaded the boat down with all the appropriate cruising features which included a 30 liter built in gas tank, a 15 HP Honda electric start outboard engine, a built in 2 burner propane stove and propane system to power the stove and the BBQ.













 

SailingTips.Ca

Feigns Knowledge
823
370
Victoria, BC
Kinda like this one.
That's a cool boat!

I think it's only partly foiling though, like the F-85SR/F-82R kit, Carbon Credit, and Taniwha (formerly Jailbreak). 

For full foiling I think you'd need the T-foil on the dagger board and rudder, but I suspect the dagger board case would need substantial reinforcements to withstand the much higher torqueing loads.

 

basketcase

Fuck you second amendment
4,195
1,126
a long way from home
How hard is it to make a one off work before you get a chance to get scared?
How long is a piece of string?..... Reinforce the hull... Build tools and parts for a t rudder and cassette, two asymmetric boards and trunks, and install the trunks. The tooling cant be cheap stuff as it wouldn't survive building the parts.  And i don't think that there is much on the shelf you can modify.

 
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SailingTips.Ca

Feigns Knowledge
823
370
Victoria, BC
I can see why you'd want to have a semi-foiling F. Going full foiling makes everything much harder, complicated, risky.
This is invaluable from somebody with experience in such matters!

It would certainly take things up to the next level, require precise weight control etc. 

The stakes are also much more manageable for non-billionaires with a smaller craft (e.g. beach cat).

 

WetnWild

Super Anarchist
1,320
56
Brisvegas
Yes dumb idea. 
Corsair/Farriers are designed and built as cruiser racers. That means hull shape, weight and build schedule/ strength are at the opposite end of the spectrum to foilers. The serious attempts at generating lift and not even foiling were strongly advised against by Ian Farrier. He reluctantly agreed to build some float C boards for the 85/82 crowd with the express instructions to lift them progressively as the wind increased. I’ve seen the results of that advice not being followed. 
Foiling requires a whole range of new sailing skills and a much higher level of expertise than most F boat crews possess. Better off starting from scratch with a purpose designed boat, a large bank balance you are prepared to lose and a willingness to crash a lot and break a lot of gear. 
COVID dreaming is good but probably better directed towards mermaids on deserted beaches. 

 

multihuler

Anarchist
825
322
Reno
Interesting,  from a m 32 and mama tried, what else is there?

M32's have  defective masts, other than that it doesn't get any better, and mama tried was near perfect other than needing a minor? Overhaul.

 value in a 20ft cat?   no family invited.

 my flagged boat is the semi foiling, carbon f32srx in Australia. She appears to be a deal, price dropped $50k, and light, but sitting on the market would raise  questions.

Large or small crew, small cabin, dry sail, big foils, stupid fast

 

SailingTips.Ca

Feigns Knowledge
823
370
Victoria, BC
Yes dumb idea. 
Corsair/Farriers are designed and built as cruiser racers. That means hull shape, weight and build schedule/ strength are at the opposite end of the spectrum to foilers. The serious attempts at generating lift and not even foiling were strongly advised against by Ian Farrier. He reluctantly agreed to build some float C boards for the 85/82 crowd with the express instructions to lift them progressively as the wind increased. I’ve seen the results of that advice not being followed. 
Foiling requires a whole range of new sailing skills and a much higher level of expertise than most F boat crews possess. Better off starting from scratch with a purpose designed boat, a large bank balance you are prepared to lose and a willingness to crash a lot and break a lot of gear. 
COVID dreaming is good but probably better directed towards mermaids on deserted beaches. 
Cheekee Monkey separated their amas from their akas flying two hulls with a partially lifting foil so Ian was right!

My sense is that full foiling boats are kind of like the helicopters of the sea - fixed wing experience is helpful but it's really a whole new ball game. 

I'm really quite pleased with the performance of the F-82R, and especially how well-mannered it is when pushed hard, and I don't want to wreck that. It's also quite weight-sensitive, so adding 150lbs for even the partially foiling kit is not particularly appealing, since it's the light air performance that is the weakest, and adding weight and foils is not going to help that. 

Also, getting an entry-level foiler like an S9 is cheaper and easier than even getting the parts to get an F-boat partially foiling. 

Any good suggestions for deserted beaches with mermaids?

 
Only semi-foiling experience here, but I'm sure a foiling Farrier or Corsair tri is technically achievable. But as others have said, almost certainly not worth it. I'm guessing you would add at least 150lbs to the boat. You would have a high takeoff speed and it would be downwind only. You would be slower all the time in light wind. Slower all the time upwind. And maybe only faster off the wind in moderate to strong breezes.

 

REW

Anarchist
929
61
I owned Cheekee Monkee from  2006 through 2011 when I purchased it (originally with a partner) and two years later owned it solo.  I continued t sail her for an additional 3 years after I sold her to a new owner.  It was a great boat and well conceived by Kim Alfreds (at great expense).  We continued her development, sometimes out of necessity and some from creativity.  She was a "semi foiler" and a very capable offshore boat with real accommodations including 2 pipe berths, small galley top and nav table.  60% of the boat was customized and reinforced as well as lightened from her original weight of 4400 plus lbs to around 3600 by the time I sold her.  If you really wanted a semi foiler or full foiler and didn't have the opportunity to buy someone  else's experiment at a deep discount, you'd be better off starting from scratch.  Cheekee wasn't easy to maintain, the boat was under extraordinary load and I worked really hard to stay ahead of things to keep it fresh and going strong.  Fortunately I am a very capable rigger, pretty good at fixing shit and have a good friend who was able to help me with repairs and stuff that was over my skis.  Our race program included races from around the buoys to 600 nm.  I am not aware of any full foilers in 33' or less that can handle that range in a full range of sea state which has to be considered when deciding whether to fully foil or not.  If your choice is buoys, flat seas and <20-25 kts of wind full foiling might make some sense.  If that is the choice, don't fully foil a farrier.   If you want offshore capable maybe semi foil, but you will still spend a fortune on a conversion.  BTW, I had CNC machined foil molds for Cheekee and we had to build three foils during my ownership due to breakage.....at a cost of $2,000 plus per foil.  C foils are a whole other level of torture and I have no idea what they cost.  

Loved the boat, bought her for 10,000 less than I sold my prior stock F-31 for.  Wouldn't trade the experience and loved almost every minute of it.

 

vokstar

Member
336
208
Tasmania
 my flagged boat is the semi foiling, carbon f32srx in Australia. She appears to be a deal, price dropped $50k, and light, but sitting on the market would raise  questions.

Large or small crew, small cabin, dry sail, big foils, stupid fast
I think I know the boat you speak of I think, she has had a bit of bad luck, in Hamilton Island was struck broke an Ama and was holed. Maybe proving the point that foiling, even semi on a Farrier isn't a great idea she has also capsized in Geelong

https://www.hamiltonislandraceweek.com.au/media-releases/multi-mayhem-at-audi-hamilton-island-race-week-201

 

SeaGul

Super Anarchist
1,375
120
Oslo Norway
Ref breaking off the ama - did that with the T-35 bec of assymetric daggers on the floats - at 10kn+  upwind - that was too much - but there was some weak spots that gave away... But - T-foils on the amas - wouldt give so much torque on the construction - , more pure  lifting  - that is easier to deal with. Ref. AC now - it is basically T-foils. Then you could use both foils to get out of water - maybe all   the time with both - Moth - style control.  

 
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