GL: The wrong way

[Ralph Yost (home)]

"You are thinking of "over the ground" when you say "through the water."

Bill Donovan was kind enough to bring this to my attention.

He is CORRECT.

I stand corrected....I should have stated "over the ground" when i wrote
"through the water." I should have known better.....its not that difficult 
of a concept.

Over the ground...Is the only way the math works out as I outlined it.

What did the circus guy say....
"You can fool some of the people some of the time but not all of the people
all of the time..."?

R.



----- Original Message ----- 
From: "Ralph Yost (home)" <Ralph at AlphaCompServices.com>
To: "Bob and Liz Stagg" <stagg10 at knology.net>;
<great-loop at lists.samurai.com>
Sent: Saturday, March 01, 2008 7:31 PM
Subject: Re: GL: The wrong way


> Note that I have never made this trip up or down rivers in the spring
> flood.
> So I dont have personal experience with this case. But one observation
> appears obvious to me about traveling upstream during these spring floods
> in
> the presence of damaging objects ((trees, refrigerators, etc.) -
>
> If a dead-head log, or other object, is flowing DOWNSTREAM at 3 kts, and
> you
> have your boat moving THROUGH the WATER at 7 kts, you have effectively
> created the possibility of a collision with that object at an effective
> speed of 10 kts. Your speed in the exact opposite direction of the object
> will be additive to the object in terms of damage effect. If you could see
> the object in time to pull back the throttle and bring your boat to a dead
> STOP in the water, the object might still hit you at 3 kts.
>
> And of course the opposite is true if you were traveling in the same
> direction, downstream, as this 3 kt log but your boat were moving THROUGH
> THE WATER at 7kts - then your effective collision speed with the object
> would be subtractive...or a net of 4 kts. Now, if both boat and object are
> moving in the same downstream direction, and if you could see the object
> in
> time to pull back the throttle and bring your boat to a dead STOP in the
> water, the object could continue traveling at its 3 kts and be DEPARTING
> from you at that speed. Even if you couldnt overcome the following current
> and actually STOP the boat, if you could remove the forward speed THROUGH
> THE WATER, your collision with the object would be at minimal impact
> speed,
> or potentially almost zero, if your boat was floating along at 3 kts.
>
> Just some food for thought about traveling upstream when objects are
> present
> that I dont believe some people may consider.
> R.
>
> ----- Original Message ----- 
> From: "Bob and Liz Stagg" <stagg10 at knology.net>
>
> Although this usually allows the big stuff (trees, refrigerators,
>> etc.) to get stuck on the banks, we still had a lot of trash in the water
>> and some significant current.  With a slower boat you may want to wait
>> til
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