Facebook

Login

Support Sailonline

If you haven't already - join the SAILONLINE YACHT CLUB!

Please also consider making a donation - all amounts are greatly appreciated!

Board » Technical Support » qTVlm wish list #3.

Page: 1 2 3 Next

Posted by
JB


Users avatar

Posts
305
Registered at
2013-03-07 08:54:34
2016-07-01 14:23:21 - qTVlm wish list #3.
After the new qT 5.3.7 version my wish list (now, the #3) didn’t change at all.

What I would like to have:

1 - Possibility to pause and resume the “routing” routine calculation.

2 - Elimination of the annoying extra imposed tack/gybe waypoints on the “routing” calculation before boat effectively changes direction.

3 - Resulting from waypoints over decimation, during the “Simplifying” process the calculated ETA normally is bigger than the initial calculated one. In that situation the ”Simplifying” process should be immediately automatically stopped.

4 - To avoid/reduce, namely, the jigsaw calculated “routes”, possibility to define and impose a minimum time delay between consecutive boat maneuvers, with a time parameter for tacks and another one for gybes.

5 - Possibility to superimpose the initial calculated Isochrones and the final calculated ”route” (after applying the Simplifying and Optimizing processes).

6 - Possibility to make a free hand selection of the calculated waypoints (now, only available the rectangular shape selection area).

7 - Boat “Polar analysis” was better in the previous versions where you could see all the Polar curves using with the “Display all” option. That option disappeared (?!).

8 - VMGUp and VMGDown points shown in the Polar Curves.
Sail Fair.
Posted by
maitai


Users avatar

Posts
114
Registered at
2016-02-25 08:15:33
2016-07-01 16:47:43 - Re: qTVlm wish list #3.
Quick answer:

This minor release was mainly meant to fix a small issue with VLM mode.

I don't quite understand your point 2) . Is it related to 4) ?

Concerning point 4): This aspect has been greatly improved already in 5.3.6. Did you check it? There is a chapter on that in the documentation.

Point 3) The simplifying process may increase a little ETA if you choose "Maximum simplification". Choose "Optimum simplification" if you don't want this to occur.

Point 7) Yes it has been removed, on purpose because unreadable most of the time.

Point 8) Values are shown on the right panel. Do you mean to show them also graphically?

Philippe.






--- Dernière modification par maitai le 2016-07-01 16:48:07 ---
Posted by
JB


Users avatar

Posts
305
Registered at
2013-03-07 08:54:34
2016-07-02 08:41:42 - Re: qTVlm wish list #3.
Viva Philippe.

Thank you for your reply.

2) and 4) are different problems.

2) qt always tries to add an extra tack or gybe right before effectively change the boat route direction. This is irritant because you have to spend more time hand trimming that extra generated waypoint. This problem is particularly agravated when the routed path goes downwind.

But more. With the last release I started to get with res wind Gribs "breaks" in long curved routed paths after making the Simplifying process. Instead of having a continuous curve, qT tries to break allong the curve with a manouveur in direction to the curve center. I give you a clue: smooth curves, is the drill.

4) Especially downwind, comes the second described problem, the jigsaw path, when qT generates (as an example) #10 gybes in 10 minutes, i.e., going for a boat manouveur in every minimum Time Step (1 minute) that qT allows. If you are using the mentioned minimum TS the number of extra tack waypoints to be trimmed after is huge. With the Loss of Performance you get in every manouveur you make, it's not logical that qT finds out that the quickest path is the one using a larger quantity of directions changes (tacks).
On one side of the "equation" we need to have hi res wind Grib files and a shorter TS. On the other, qT over stretches the results generating more than abundant waypoints. Hence my suggestion to apply different limitating parameters in 4).

3) My dear Philippe, I never use the "Maximum" option. Never. Even so... ETA goes up which is a nuisance.

7) Well, with the actual by default Polar window size that unreadable problem shouldn't occur, no? Pls have a try on that.

8) Yes, correct. Also graphically.

Thank you Philippe.
Sail Fair.
Posted by
maitai


Users avatar

Posts
114
Registered at
2016-02-25 08:15:33
2016-07-02 08:53:28 - Re: qTVlm wish list #3.
For the 4):

Even if you don't specify an actual polar penalty for tack and gybes, you can specify a number of cranks duration for tacking. For instance if you put 10 there, and your crank is 1mn, qtVlm wont be able to tack or gybes for 10 minutes after a tack or a gybe.

--- Dernière modification par maitai le 2016-07-02 08:53:58 ---
Posted by
JB


Users avatar

Posts
305
Registered at
2013-03-07 08:54:34
2016-07-02 13:37:10 - Re: qTVlm wish list #3.
Ok, I'm going to try it with 5 cranks/minutes for a FIRST 47.7.
Anyhow, the qT limitation is equal for tacks and gybes, when it should be different.
Sail Fair.
Posted by
JB


Users avatar

Posts
305
Registered at
2013-03-07 08:54:34
2016-07-02 14:33:21 - Re: qTVlm wish list #3.
Sorry Philippe but... no go. The problema remains, qT tries to put allways that anoying extra waypoint for a gybe.

Something here tell's me that the minimum TS/crank is (?) in conflict with the time for delay on boat maneuvers.
Sail Fair.
Posted by
maitai


Users avatar

Posts
114
Registered at
2016-02-25 08:15:33
2016-07-02 15:04:58 - Re: qTVlm wish list #3.
Probably I don't understand what is your extra waypoint for a gybe. Can you join a screenshot?
Posted by
JB


Users avatar

Posts
305
Registered at
2013-03-07 08:54:34
2016-07-03 15:22:42 - Re: qTVlm wish list #3.
Viva Philippe.

Pls see attached PDF file.

Thank you.
Sail Fair.
Attachments
Posted by
maitai


Users avatar

Posts
114
Registered at
2016-02-25 08:15:33
2016-07-03 18:12:52 - Re: qTVlm wish list #3.
Hmm that is gonna take a bit of time, and I am leaving for vacation in a couple of days for almost 3 weeks ;)

Can you send me via email an export of your configuration including polar please?

Posted by
JB


Users avatar

Posts
305
Registered at
2013-03-07 08:54:34
2016-07-03 19:59:45 - Re: qTVlm wish list #3.
Viva Philippe.

I can send you everything you need..mais, quelle est ton email, Philippe?

(mon email: pertisjm@net.sapo.pt )
Sail Fair.

Page: 1 2 3 Next

Please login to post a reply.

Races

Next Race: 00d 00h 00m

Current Races:

Christmas to Christmas Island 2025

Two waypoints, start and finish, and between them 5827 NM of two oceans. Not much time if we want to sit at the Christmas Eve table. You will need to maintain an average speed of over 10 knots, maybe quite possible with this Maxi Trimaran, but prepare your vessel well and choose the best of the many possible routes. Hands up everyone who knew there were TWO Christmas Islands?! OK, maybe you have sailed this Sailonline course before... but it's time to get ready for the 2025 challenge of racing between Christmas Island in the Pacific to Christmas Island in the Indian Ocean! It also marks the conclusion of our prestigious Ocean Race Championship 2025. Please have fun! Fair winds!
PRIZE: SMPF
Race #1967
INFO by brainaid.de
Maxi Trimaran PARTICULARS
WX Updates:
0430 / 1030 / 1630 / 2230
Ranking: OCQ4 - OCCH - SUPSOL - SYC
Race starts: Dec 01st 11:00 Registration will open soon
▶ Flash
GO TO RACE

Andaman Islands PYOC 2025


The Andaman Islands are an archipelago, made up of 200 islands, in the northeastern Indian Ocean. Together with the Nicobar Islands to their south, the Andamans serve as a maritime boundary between the Bay of Bengal to the west and the Andaman Sea to the east. These waters will be the theater of our next 240nm race in the ARCH 2025 series. Which one you choose depends only on you, i.e. your Elan 410 sport will leave the Andaman Islands on the starboard or port side.
Race #1965
INFO from brainaid.de
Elan 410 PARTICULARS
WX Updates:
0430 / 1030 / 1630 / 2230
Ranking:
ARQ4 - ARCH - SUPSOL - SYC
RACE CLOSE: Monday,
December 1 at 2300 UTC.
Race starts: Nov 24th 17:00 Registration Open!
▶ Flash
GO TO RACE

Sinbad by Balloon 2025 - Carnarvon to Dondra


From here, our home in Bharatavarṣa is now north west of us – said Sinbad to his fellow balloonists. Perhaps we can ride the wind first further north, and then catch the winds that every year bring the rain, perhaps not. It’s 2600nm and we could be aloft awhile, so, Master el-Quarters, victuals only, no sandbags, provisioning the giant hamper. It will be not a picnic!
Race #1886
INFOby brainaid.de
SOL Balloon PARTICULARS
WX Updates:
0430 / 1030 / 1630 / 2230
Ranking: SYC - SBB
RACE CLOSE: Tuesday,
December 9 at 2300 UTC.
Race starts: Oct 15th 11:00 Registration Closed
▶ Flash
GO TO RACE

Go to race archive

SYC Ranking

  1. Sailonline Yacht Club Member KaSToR
  2. Sailonline Yacht Club Member CriticalHippo
  3. Sailonline Yacht Club Member WRmirekd
  4. Sailonline Yacht Club Member rafa
  5. Sailonline Yacht Club Member CollegeFund
  6. Sailonline Yacht Club Member vida
  7. Sailonline Yacht Club Member bonknhoot
  8. Sailonline Yacht Club Member BRENTGRAY
  9. Sailonline Yacht Club Member sassy63
  10. Sailonline Yacht Club Member Panpyc

View full list

Series

Mobile Client

SYC members have the benefit of access to our mobile/lightweight web client!

The mobile client