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Search found 419 matches

by James9118
Tue Jan 29, 2013 5:33 pm
Forum: Saltwater
Topic: Trip Planning - Bahamas
Replies: 8
Views: 4471

JAT wrote:Yes bud swains cay lodge on the middle bite
You're really roughing it then! :D. Looks great. Andros has the angriest horseflies in the Bahamas though :p .
by James9118
Mon Jan 28, 2013 11:17 pm
Forum: Saltwater
Topic: Trip Planning - Bahamas
Replies: 8
Views: 4471

JAT wrote:heading to Andros on the 20th April looking forward to it!
are you going to a lodge?
by James9118
Mon Jan 28, 2013 5:55 pm
Forum: Saltwater
Topic: Trip Planning - Bahamas
Replies: 8
Views: 4471

Thanks Greg and David, I ended up booking for mid April.
by James9118
Sat Jan 26, 2013 7:00 pm
Forum: Flycasting
Topic: WF or DT? - Which can you cast farther?
Replies: 49
Views: 25101

Surely the first 60ft of a DT would weigh more than the WF.
by James9118
Sat Jan 26, 2013 11:49 am
Forum: Flycasting - 2 Handed
Topic: Rod Loading - Spring v Lever
Replies: 602
Views: 163014

I think one of the mistakes made by myself here is showing the results of the model for situations that are a million miles away from a cast. For example, the answer I gave for Aitor's experiment showed an oscillating result. However look at the time base, I plotted this out to 6 seconds (I don't k...
by James9118
Thu Jan 24, 2013 6:05 pm
Forum: Manshit
Topic: Welsh manshit
Replies: 9
Views: 12399

I once fended off an angry Jack Russell - no one called me a hero, and I didn't make it on to Sky news :???: . Just don't understand it - I'm Welsh too They possibly thought you'd mistaken it for a very small sheep :p The way it was biting at my trousers it was no wonder they ended up around my ank...
by James9118
Thu Jan 24, 2013 5:48 pm
Forum: Flycasting - 2 Handed
Topic: Rod Loading - Spring v Lever
Replies: 602
Views: 163014

This represents a steady extension of the spring under an increasing load. Mark, I think this is where you're going wrong with how you're visualising this. This is down to boundary conditions. Suppose the spring is already extended before you start accelerating. The constant acceleration (constant ...
by James9118
Wed Jan 23, 2013 9:55 pm
Forum: Flycasting - 2 Handed
Topic: Rod Loading - Spring v Lever
Replies: 602
Views: 163014

Mark,

In a previous post you highlighted a comment of mine about the spring reaching its maximum extension - this is the maximum for the conditions applied, not the maximum possible!

Spring extension is proportional to force, so it will continue to extend.
by James9118
Wed Jan 23, 2013 9:20 pm
Forum: Flycasting - 2 Handed
Topic: Rod Loading - Spring v Lever
Replies: 602
Views: 163014

Stoatstail50 wrote:When, during a normal casting stroke, does the rate of acceleration of either my hand or the rod butt decrease

Incidentally - that takes us back to the 'driven' model.
by James9118
Wed Jan 23, 2013 9:16 pm
Forum: Flycasting - 2 Handed
Topic: Rod Loading - Spring v Lever
Replies: 602
Views: 163014

Sorry Mark - my posts relate to Aitor's experiment :p.
by James9118
Wed Jan 23, 2013 7:43 pm
Forum: Flycasting - 2 Handed
Topic: Rod Loading - Spring v Lever
Replies: 602
Views: 163014

Remember you're looking at velocity there - if I put acceleration up it would be exactly 90 deg out of phase.
by James9118
Wed Jan 23, 2013 7:31 pm
Forum: Flycasting - 2 Handed
Topic: Rod Loading - Spring v Lever
Replies: 602
Views: 163014

Trev, When the hanging mass is dropped, it obviously initially accelerates at 1 g . Initially there is no extension in the spring so the force on the table mass (counterweight) is zero. As the spring extends, so the retarding force on the falling mass increases, thus it's rate of acceleration decre...
by James9118
Wed Jan 23, 2013 5:54 pm
Forum: Flycasting - 2 Handed
Topic: Rod Loading - Spring v Lever
Replies: 602
Views: 163014

Which idiot said it wouldn't oscillate? :blush:

I've had chance to look at it today, adjusted my spreadsheet and got this:
by James9118
Tue Jan 22, 2013 10:13 pm
Forum: Flycasting - 2 Handed
Topic: Rod Loading - Spring v Lever
Replies: 602
Views: 163014

Hi Grunde, I'll change my spreadsheet to reflect Aitor's experiment in due course - therefore what follows is more of a gut feeling : My initial thoughts are that Aitor's two masses will end up with a static spring extension between them, up to the point when the one subject to gravity hits the flo...
by James9118
Tue Jan 22, 2013 6:48 pm
Forum: Flycasting - 2 Handed
Topic: Rod Loading - Spring v Lever
Replies: 602
Views: 163014

The spring in a sense takes kinetic energy out of the falling brick and transfer it to the sliding brick (the falling brick does more work on the other brick when the spring is introduced). The mechanism is exactly the same as for the brick-spring-car model, only the boundary condition is changed (...