The Key to Upwind Performance | Dynamic Tuning | North Sails Expert Charlie Cumbley & Cyclops Marine

[@yigalglebrozval6533]

Great vid for amateurs' who want to improve their understanding of sail's trimming. It is amazing how few videos there are on this topic, considering amount of people buying yachts. For those who look for a good book for sails trim I'd recommend Felix Marks - best sail trim book I read.

[@Drew-eo2oj]

Thank you good stuff! it always helps to have a detailed refresher. Properly trimmed boat is such a great feeling. The other day I was on a J105 in flat water about eight knots of wind and we had the sails so beautifully trimmed on a close reach that the helm remain stationary when I let go. I was in awe and it was spectacular.

[@fabienh3943]

Lovely boat, very well explained. Try Quantum Sails tutorials one day to be convinced. I noticed the backstays....and the fathead. By personal experience; a busy combination! The one tutorial I haven't found yet, is how to use those together well in different conditions. On open Oceans it's ok. On busy waters however...

[@CapriceV6]

Great video - MORE please! My race boat has the tensionable Forestay I can adjust from the cockpit

[@Toob41]

Good tutorial thanks. Jeanneau Sun Fast 3300 £130,000 and £1,600 for the load sensor - I can afford the telltales!

[@fabienh3943]

Thanks. Wasn't sure. It's a bloody beauty....getting more expensive by the day apparently

[@crapisnice]

also you can use twist to power (stalling the base) or depower (stalling the top=less heeling and turbulence drag) the sail top area this info is found in airplane wing twist, that is mostly used to control stall and parasitic wing tip drag

[@cgrelon]

Excellent video

[@esp1304]

Great information for a Main sail trimmer like me! Thnks

[@larry9210]

Excellent video, thank you so much. Can you talk a little about mast bend? Especially when your boat has running and standing backstays. I never know if I’m supposed to use the running back stay to keep the middle of the mast straight and use the main backstay to pull the top of the mast back to help flatten the main sail. . Thanks again.

[@martygingras8683]

If what you are calling a 'running backstay' will straighten your mast when the standing backstay is pulled on tightly, then it's what we'd call a 'checkstay' and that's how you are supposed to use the two. Flatten both sails by pulling on the standing backstay, then --- if the main is too flat --- tension the checkstay to power-up the main to achieve the balance you want.

[@jungtarcph]

I would be cool to track speed and height and do systematic tests of many combinations...

[@andreruegg9490]

awesome, thanks!

[@Airsails]

DEPTH? Are we confusing it with draft {camber)? What about angle of attack? It is first and foremost to beating.

[@winstonlord9824]

Thanks Charlie, nice vid. Looking at the mainsail the top batten was falling to leeward on every shot. I was always taught that the top batten should be parallel to the boom. Perhaps it is different with fathead mains?

[@yigalglebrozval6533]

It should be twisted leeward - wind's speed is higher up there. Sail should be twisted, same way plane's propeller is twisted.

[@bryansmith1920]

Should racing Yachts go back to multi-masts the Hull form already has a limit ???

[@jornhaga8823]

A bit surprised there was no mention of traveller use??

[@bsinton]

I think thats a basic tutorial to keep it simple to start with im sure they will explain that in another video theres alot they didnt show in this vid

[@12345fowler]

I mentionned car position. isn't the car the same as the traveller ?

[@bsinton]

Its har for different parts of tge world a car in aus is controlling the headsail clew and traveller is the main slides controlling twist i think the videp was a good basic tutorial

[@DrKnowNothing1]

Or mainsail outhaul?

[@bsinton]

@@DrKnowNothing1 have u seen the next video

[@cgrelon]

More please

[@blagger42]

The load on the stays are measured in what units?

[@cliffordbradford8910]

at 6:59 he says it's a 500kg forestay tension change. The display went from 1.2-ish to 1.7-ish so that display was in metric tonnes

[@danstanford3071]

The missing element to low mast compression for light winds (when you are seeking more power) is twist in the main? We are trying to take twist out of the main when seeking power by lowering the traveler and sheeting on the main to close the upper leech of the main. Inevitably this extra main sheet tension adds tension to the forestay, how do we balance this?

[@martygingras8683]

Hey Dan. (1) Twist in light wind is to account for the usual and sometimes very significant wind speed gradient (and thus apparent wind angle gradient) from top to bottom. W/o twist, the top tends to stall. (2) When I trim main on the E 37 in light winds, I pull the traveler above centerline and ease the sheet to get the twist we want w/o reducing angle of attack. (3) Proper mainsheet tension on the E 37 in light wind won't appreciably load the headstay.

[@tedhoppe5918]

Great for folks that sail in 10kts. what is the north set up for Beaufort wind force scale of 5 (over 20kts) with this system in heavy sea chop? I just saw a new 3300 reefed get tossed on its ear with poor pointing ability in those conditions.

[@rydenkaye9735]

In windier conditions you want a more twisted mainsail to both spill power up high where it’s less effective (because it’s higher up it tips the boat more and you’re power limited by righting moment) and also to widen your grove to allow for steering for waves. Having a more twisted sail means a portion of the sail remains powered at a wider range of apparent wind angles allowing you to keep power while heading up and bearing off to reduce slamming in waves

[@casatv8916]

What boat is that?

[@marcsmann9569]

Jeanneau Sun Fast 3300

[@michaelquigley1411]

My Gawd, whom is this video for? People who are learning to sail will not be considering a "Smart Tune" for the forestay on their 40 year old Sonar. OK... let's get on with your commercial... The rest of the info is pretty good and I'll share this with my adult sailing students with a caveat to disregard the high tech equipment and boat.

[@beezergood]

Charlie Chumbley? You'd think they would get the presenter's name right...

[@grahamsharp5130]

I know! Poor Charlie

[@brettharman8921]

bending air-

[@johngregory4801]

While this is all great information, I know that it's not truly a North Sails video. All Old School disciples of North Sails' teaching courses know this yacht isn't legit... It isn't named "Lumpy Gravy".

[@glennwalters948]

I know we all have our bias, etc, but despite the face the SF3300 is not a yacht, is that the basis for stating it is not legit?

[@martygingras8683]

@@glennwalters948 It was humor.

[@lionelmartinez4681]

What boat is this?

[@glennwalters948]

Jeanneau SF3300