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02.09.24

Vi vil:

• Gjør oss noen tanker om hvordan å måle krefter på båt
• Liste opp hvilke krefter som er relevante og hvordan måle disse
• Hvilke sensorer er relevante?
• Se på hvordan man kan 3D scanne ting, og bruke den modellen til å lage skreddersydd utstyr?
• Gjøre seg kjent med hvilke materialer en seilbåt er bygd av
• Fått prøvd å seile litt?
• Fins det litteratur på lignende cases?
• Hva vil egt OLT? Hvilke problem kan vi hjelpe de med?
• Hvordan funker sitski?
• Hadde vært kult å lage en skalert modell for å komme oss inn i den mindre vindtuellen
• Hvem kan vi snakke med/ta inspo fra?
• Jesper Saltvik Pedersen - sitski utøver
• NTNU marin, fins det noen der som har forsket på seilbåt?
• NIH, fins det noen der som har forsket på sitski eller seilling?
• Vindtunnell folka, har de sett at det har vært lignende prosjekter?
• PhD + professor i faget produkt- og materialtesting har sikkert smarte tanker om testing av glassfiberelementer

03.09.24

Vi snakka litt med Eirik og fikk høre at dette vil seilfolka finne utav:

• De tenker på teknikk og taktikk
• Sensorrigg som gjør at man kan skjønne hva som skjer i båten med krefter på tau, båten, hvordan gjøre kryss
• Treneren kommer til å se på disse dataene
• Treneren følger på en rib

Eirik tenker modulær sensorrigg som kan slenges over på alpint etterpå
Oppgaver:

• Hva kan vi måle, hvilke sensorer?
• Sammenstilling av denne modulære sensorriggen som samle og logger data med GPS klokke
  • GPS klokke moduler
  • Vi kan begynne kablet eller gå rett på wireless

Vi MÅ måle vind, også mest sannsynlig IMU (inertial measurement unit) data, hastighet, posisjon, andre krefter
Problemstillinger som vi kommer til å møte på men ikke nødvendigvis trenger å forholde oss til enda:

1. Utstyr må være vanntett
2. Begrenset med plass, vil ikke fortyrre utøveren så utstyret må være smått
3. Kapasitet

Se på krefter i ristropp, ror, seil, trip, kantring
Kamera for å gjenkjenne posisjon?

Ambisjon om å legge på video feed down the line så man lettere kan koble data til hva som faktisk skjer.

Kult om man kan ha video feed av flere utøvere

Vi skal hovedsakelig se på båter i klasse ILCA 6 og 7 (herre og dame)

_{Image source: https://www.parallel45marine.com/our-services/ilca-laser-dinghy/} 

04.09.24

Should we plot Velocity Made Good (VMG) like they did in this paper? The speed of the boat along the axis from starting point along the wind direction

Boat part names (image source):

6 degrees of freedom on a boat (image source):

Ideas for measuring of different factors:

10.09.24

Notes while reading GNSS Applications to Assess Performance in Olympic Sailors: Laser Class (2020):

• They evaluated Velocity Made Good (VMG) (knots), distance (km) and maneuvers (number of maneuvers) using GNSS
• They divided performance of upwind, downwind and broad reach performance into different datasets
• "Dinghy sailing is a sport with specific characteristics, since performance will not only be determined by the level of physical fitness of the sailor, but also by the characteristics of the boat and the weather conditions. Therefore, Olympic sailing is a complex sport in which performance is determined by the ability to understand and anticipate the weather conditions, having adequate equipment for the boat (e.g., quality sails), and the mastering of the technique and tactics"
  • Would there be any benefits to downloading weather and tidal forecasts?
• "Among the different Olympic classes, the sailors in the Laser class are considered dynamic hikers, since, due to a high sailor-to-yacht weight ratio, they are required to sail the boat in a very dynamic manner. This monohulled-type class was designed by Bruce Kirby in 1969 and it is manned by a single athlete. The Laser class is a one-person keelboat: the weight of the boat is 59 kg, the overall length is 4.23 m, the beam length is 1.37 m and the sail in the Olympic category is different for men and women. Women compete in the Radial (5.76 m2) category and men compete in the Standard (7.06 m2) category. This is an Olympic class since 1996 and sailors compete under the One Design rule. The One Design class is controlled by World-Sailing® and the class rules are written to prevent any changes from the manufactured boat that might affect performance, ensuring that all the competing boats are the same. This rule states that all sailors must compete with the same boats and sails and, thus, under the same conditions."
• "The sailor’s technique determines the velocity of the boat, and the VMG on the windward and leeward courses is considered the most important variable in a regatta [...] The distance traveled during the regatta is a tactical variable that determines the performance of the sailor, since higher level sailors complete the course in shorter distances. The maneuvers influence the performance of the boat, since speed decreases when they are carried out, thus the sailor must decide when to perform them, and he/she must do it efficiently in order to minimize the loss of speed."
• Should we install camera above to evaluate technique in the surge-sway plane?
• This dataset was collected with TracTrac. The device weighed 60 g, including mobile connection and a battery. Transmission frequency was 5 Hz.
• They assessed the data with analysis of variance
• "This could indicate that these (better) sailors have a better technical level, which would allow them to handle the boat more efficiently to reach higher speeds, thus keeping the boat in a planning condition, thereby reducing its hydrodynamic resistance. Some studies have shown that more successful sailors are faster and have a better pointing angle, which ca be achieved only with a higher level of physical performance, as it is known that efficient hiking is related to boat speed and boat handling performance"
  • How do they do this? How can we measure this?
  • What angle is this?
• It is mentioned several times that better sailors sail shorter routes during the regatta, which is in line with other papers on windsurfing. They advise coaches to consider distance covered in training since maneuvers are physically demanding.

11.09.24

https://www.windy.com/-Waves-waves?waves,63.424,10.396,5