Cruisers & Sailing Forums - Search Results

		Cruisers & Sailing Forums > Search Forums
Search Results

Vendors

Page 1 of 4

Last »

Showing results 1 to 25 of 78
Search took 0.00 seconds. Search: Posts Made By: foolishsailor

Forum: Challenges

29-11-2013, 01:30

Replies: 774

Let's Get to the Bottom of the Lee-Bow Effect Once and For All

Views: 57,001

Posted By foolishsailor

Re: Let's Get to the Bottom of the Lee-Bow Effect Once and For All

That is not what I meant - but is still right I guess.

I was stating that my simple scenario refutes the claim of the effects existence. However I guess my scenario is also a "claim" and not...

Forum: Challenges

29-11-2013, 01:11

Replies: 774

Let's Get to the Bottom of the Lee-Bow Effect Once and For All

Views: 57,001

Posted By foolishsailor

Re: Let's Get to the Bottom of the Lee-Bow Effect Once and For All

All i really need is the following

Current Speed
Current Direction
Wind Speed
Wind Direction

Direction from origin to destination

I will assume the following

Forum: Challenges

29-11-2013, 01:09

Replies: 774

Let's Get to the Bottom of the Lee-Bow Effect Once and For All

Views: 57,001

Posted By foolishsailor

Re: Let's Get to the Bottom of the Lee-Bow Effect Once and For All

Fair enough. I have a bunch of polars for different boats - I will draft up a drawing using the polars and current showing time to mark for different strategies.

If anyone would like to give me...

Forum: Challenges

29-11-2013, 01:04

Replies: 774

Let's Get to the Bottom of the Lee-Bow Effect Once and For All

Views: 57,001

Posted By foolishsailor

Re: Let's Get to the Bottom of the Lee-Bow Effect Once and For All

Evans we cant all be well written authors now can we?

If a mathematician makes a claim that a principle exists another mathematician only has to provide a single instance where that claim does not...

Forum: Challenges

29-11-2013, 00:10

Replies: 774

Let's Get to the Bottom of the Lee-Bow Effect Once and For All

Views: 57,001

Posted By foolishsailor

Thanks SL and what I said is factually accurate...

Thanks SL and what I said is factually accurate and there was a scaled drawing attached that illustrated it. It is only true in the scenario I presented.

Forum: Challenges

28-11-2013, 10:36

Replies: 774

Let's Get to the Bottom of the Lee-Bow Effect Once and For All

Views: 57,001

Posted By foolishsailor

Re: Let's Get to the Bottom of the Lee-Bow Effect Once and For All

Evans,

I am assuming you are using the ProNav B&G system???

You are right - we have been using the wrong terms or more precisiely one term to cover two concepts.

VMG = SpeedOverGround *...

Forum: Challenges

28-11-2013, 10:13

Replies: 774

Let's Get to the Bottom of the Lee-Bow Effect Once and For All

Views: 57,001

Posted By foolishsailor

We are talking about the validity of an "effect"...

We are talking about the validity of an "effect" not about the cumulative results of a series of strategic decisions that include wind direction and velocity changes, and tidal direction and...

Forum: Challenges

28-11-2013, 10:04

Replies: 774

Let's Get to the Bottom of the Lee-Bow Effect Once and For All

Views: 57,001

Posted By foolishsailor

Whether it is a fixed mark for a race or a...

Whether it is a fixed mark for a race or a waypoint for a cruise - if by altering your course to engage an "effect" you dont see an increase in VMG them tje effect is not benefiting your ETE to that...

Forum: Challenges

28-11-2013, 09:59

Replies: 774

Let's Get to the Bottom of the Lee-Bow Effect Once and For All

Views: 57,001

Posted By foolishsailor

Also, VMG is everything. Any other decision...

Also,

VMG is everything. Any other decision in which you choose to make a routing decision that decreases your instantaneous VMG, ie tack onto a less advantageous VMG or foot or linch - is a...

Forum: Challenges

28-11-2013, 09:54

Replies: 774

Let's Get to the Bottom of the Lee-Bow Effect Once and For All

Views: 57,001

Posted By foolishsailor

Dave, None of that is relevant to the...

Dave,

None of that is relevant to the discussion.

The "lee bow effect" either works in an instantaneous measurement or it doesnt exist.

Everything else you mentioned is about routing and is...

Forum: Challenges

28-11-2013, 09:40

Replies: 774

Let's Get to the Bottom of the Lee-Bow Effect Once and For All

Views: 57,001

Posted By foolishsailor

DTW is a subset of VMG, DTW is as irrelevant as...

DTW is a subset of VMG, DTW is as irrelevant as STW.

VMG and COG are everything when determining optimal routing.

If your STW is higher on port tack but your VMG is higher on Starboard tack...

Forum: Challenges

28-11-2013, 08:59

Replies: 774

Let's Get to the Bottom of the Lee-Bow Effect Once and For All

Views: 57,001

Posted By foolishsailor

Further to my last post: If VMG = x ...

Further to my last post:

If
VMG = x
and
Pinching = x - y ( with y equalling the loss in VMG due to pinching)
and
Current assist to VMG by pinching = c

Then

Forum: Challenges

28-11-2013, 08:39

Replies: 774

Let's Get to the Bottom of the Lee-Bow Effect Once and For All

Views: 57,001

Posted By foolishsailor

Evans, There is a difference between...

Evans,

There is a difference between pinching versus fast/high.

Fast/high and low/slow or whatever varient of terminology works in a racers sailing area are related to changing your upwind...

Forum: Challenges

18-11-2013, 00:53

Replies: 774

Let's Get to the Bottom of the Lee-Bow Effect Once and For All

Views: 57,001

Posted By foolishsailor

Re: Let's Get to the Bottom of the Lee-Bow Effect Once and For All

She does, and she clearly proved it.

For those that understood her method it is clear that it was both easier and more precise than the RYA method

No reason to be irritated that you dont...

Forum: Challenges

17-11-2013, 11:05

Replies: 774

Let's Get to the Bottom of the Lee-Bow Effect Once and For All

Views: 57,001

Posted By foolishsailor

I will, but not tonight. Time for a glass of...

I will, but not tonight.

Time for a glass of wine.

The fact that Angela is not chiming in means she is doing some serious work on these questions - and I am excited and a bit fearful ;) of what...

Forum: Challenges

17-11-2013, 10:58

Replies: 774

Let's Get to the Bottom of the Lee-Bow Effect Once and For All

Views: 57,001

Posted By foolishsailor

How the hell did I miss that you all were...

How the hell did I miss that you all were referring to a change of tide?

I completely missed that somehow...

That makes alot more sense i will now have to go back and re read some stuff I...

Forum: Challenges

17-11-2013, 10:43

Replies: 774

Let's Get to the Bottom of the Lee-Bow Effect Once and For All

Views: 57,001

Posted By foolishsailor

Re: Let's Get to the Bottom of the Lee-Bow Effect Once and For All

I think the term just still doesn't sit well because it is related to the mythical Lee Bow Effect we were speaking about in the beginning and disproved... ;)

Forum: Challenges

17-11-2013, 10:33

Replies: 774

Let's Get to the Bottom of the Lee-Bow Effect Once and For All

Views: 57,001

Posted By foolishsailor

Re: Let's Get to the Bottom of the Lee-Bow Effect Once and For All

Exactly!

Also dead on. It is very difficult to explain and demonstrate - but relatively easy to execute on the fly in the real world.

However I want to thank everyone as well as this has...

Forum: Challenges

17-11-2013, 09:54

Replies: 774

Let's Get to the Bottom of the Lee-Bow Effect Once and For All

Views: 57,001

Posted By foolishsailor

I calculated for the true wind changes and they...

I calculated for the true wind changes and they are shown by the changes in CTS. You will see the dashed red lines that represent the tacking angles for each current speed - see the numbers on the...

Forum: Challenges

17-11-2013, 09:38

Replies: 774

Let's Get to the Bottom of the Lee-Bow Effect Once and For All

Views: 57,001

Posted By foolishsailor

Re: Let's Get to the Bottom of the Lee-Bow Effect Once and For All

I should have just stuck with my original scenario - I was just feeling too lazy to calculate all the tacks for an upwind situation.

But here is another = maybe someone else can work out a...

Forum: Challenges

17-11-2013, 09:21

Replies: 774

Let's Get to the Bottom of the Lee-Bow Effect Once and For All

Views: 57,001

Posted By foolishsailor

Re: Let's Get to the Bottom of the Lee-Bow Effect Once and For All

Its all on there - each grid line is one nautical mile. The currents are deliniated by the change in color.

We assume in the case I present above that the boat maintains a STW of 10kts. SOG for...

Forum: Challenges

17-11-2013, 09:06

Replies: 774

Let's Get to the Bottom of the Lee-Bow Effect Once and For All

Views: 57,001

Posted By foolishsailor

Re: Let's Get to the Bottom of the Lee-Bow Effect Once and For All

Ok, my head is going to explode - here is the fully updated image.

I may leave it to someone else to calculate the exact ETE for both boats - but it should be pretty clear...

One boat is...

Forum: Challenges

17-11-2013, 08:37

Replies: 774

Let's Get to the Bottom of the Lee-Bow Effect Once and For All

Views: 57,001

Posted By foolishsailor

Re: Let's Get to the Bottom of the Lee-Bow Effect Once and For All

Dockhead - sorry to get you excited - it is not a real ground track. I couldnt get the ground track to print an image so I estimated.

Ignore the tacking angles - the only relevent info the short...

Forum: Challenges

17-11-2013, 08:09

Replies: 774

Let's Get to the Bottom of the Lee-Bow Effect Once and For All

Views: 57,001

Posted By foolishsailor

Re: Let's Get to the Bottom of the Lee-Bow Effect Once and For All

This is covered without calculating by the idea that you always go toward the area of least current first. It is used primarily if you have to tack upwind in current to get to your destination.
...

Forum: Challenges

17-11-2013, 07:59

Replies: 774

Let's Get to the Bottom of the Lee-Bow Effect Once and For All

Views: 57,001

Posted By foolishsailor

Re: Let's Get to the Bottom of the Lee-Bow Effect Once and For All

Europa,

I see you are using a boat speed of 6 kts which is different to the 10kts Im using - which raises something very intersting as well interms of STW for this situation that I hadn't thought...

Showing results 1 to 25 of 78

Page 1 of 4

Last »

Forum Jump

All times are GMT -7. The time now is 23:22.

Visit our Popular Forums

The Fleet

Cruising Business

Life Aboard a Boat

Seamanship, Navigation & Boat Handling

Engineering & Systems

Photo Categories

Recent Photos

Listing Categories