Beyond 90 degree aversion. See diagram.
The diagram was a tested technology on small craft that required manual deployment, however because the craft was small it could rely on a mast
float to maintain the 90 degree stability that was needed whilst an articulating bowsprit
( that was able to swing back on a hinge like a gate because of the 90 degrees capsize
) be attached to a water
bag and allowed to become effectively a crane lift
This arm when attached to submerged bag was able to use the load of that bag as leverage to right the boat.
It did not translate to larger craft back then because.
A: There is no mast
float to stop the boat going to 90.
B: Relates to (a) yeyond 90 the tech can not work(too late)
C: The bowsprit
could not be engineered to double up as a crane as it could not be made strong enough and light lift
to lift the bigger loads.
However 30 years later we have advanced censors and electronics
which overcomes problem of (A) above because sensors can anticipate the boat going turtle before it does happen.
Secondly we have advance materials (carbon) that allow the use of a hinged crane under the bowsprit line instead of the bowsprit itself that can be fired back very fast on a trigger due to the mass of carbon is low.
Thirdly the carbon arm engineered as a back to back arch is able to provide the load capacity to lever upright a larger boat whilst being extremely light weight itself.
Put that all together and then you are possibly able to effectively deploy a large drag anchor
automatically when you need it to keep the boat at 90 degrees.
I do not know the righting forces needed but one chap the other day said that to right a hobbie when totally inverted requires a 3rd of top side weight. So lets assume the boat is 10 ton then like for like you would need a 3 ton bag but at 90 and just beyond the balance point it would be far less and in fact a relatively minimal load is needed compared to the total boat weight to maintain near equilibrium balance point. Newton's first law of uniform of motion. The mass is trying to go down and not sidways.
There is not relatively a great deal of sideways pivot force at a static 90 degress. The forces come from the acceleration on the way over.
A ballast bag on the bow end of a rearward hinged arm when dropped would be in the water
very fast as the boat would be moving over it from the hinge resulting in the bag being pushed down deep. The challenge faced though is about overcoming the forces acting on the brake(lever bag) when that deployment happens from a 10 ton boat scooting along at 10 knots. The other challenge is deployment when the craft is static as this would require the punching of that that arm into deep water to get the bag operational as quickly as possible.
It was a similar problem they had to overcome when emergency
chutes were deployed from aircraft. Kept failing but they solved
Holding a boat at 90 does not require a lot of force. The forces that are being fought and controlled is inertia, wind
and wave and sail.
The set up as a standard would seem capable of lending itself to most cat designs as the hinged arm simply needs to hinge just aft of the CG with the arm itself being no more than a double sided crane boom that terminates at the bow under the deck
If you look at some of the carbon support arches now they support tons and weigh very little and the leverage force to hold a boat at 90 and drop a boat from 90 is very little.
The problem is not destroying the brake when it is deployed and trawled at a multitude of knots.
With today’s tech I do not think it is an overly complex nut buster to get this working. I hope there is success. The problem will be to make it cheap
but I don’t think it presents such high cost either and we will probably start to see these first in flying hulls as any boat even those that fly are not good for business if they go turtle a lot and it also loses its fun factor after a while..
Works for pitch
I am quite sure we will start to see this tech coming through.