MOBO Among the moorings

Don't often post over here, but thought I'd stick my head above the parapet! :p

I wouldn't like to draw any conclusions from the picture as the wash appears pretty 'short' and thus I wouldn't like to guess speed. It does look to me however as if it's semi-d rather than planing, so probably within the speed limit? (Albeit probably an 'unsuitable' speed.)

From my observations as a relative newcomer to boats, it seems to me to be the bigger stuff as mentioned above that seem to be the worst offenders, but I guess this will depend on location? I also suspect that for the odd few marina based 'occasionals', it might have been years since they actually sat at water level with perhaps 5"-6" of freeboard and maybe have lost sight of the effect they are having?

We have a 14' Fletcher so will perhaps be deemed to be on 'the dark side' with red eyes, horns etc by many here, but we often potter on the Dart when the weather isn't particularly good. We tend to plod along at idle as if we were to run at the speed limit, the boat would be pushing a fairly reasonable bow wave - and that's where I think the problem is. Some see a speed limit as a required speed, much like they do on the road (:rolleyes:) and yet the 10kts of some areas is entirely unsuitable for some vessels in respect of wake. (Not forgetting the extra fuel they're burning whilst 'almost planing') I love speed and have the view that there's enough space for us all to enjoy (even Jetskis :eek:), but everything in the right place and a little thought for others costs nothing.

Those of us in small boats (mobo's or raggies alike) perhaps appreciate the wash issue more because we're closer to it and have much less freeboard than those in bigger vessels? Whilst I personally couldn't care less if we spill drinks, a swamped boat or losing a child overboard is a real possibility on occasion. We've been thrown about by an overtaking sailing boat (under power) as well as mobo's and the worst I witnessed on the river was an inflatable tender that passed us as if we were standing still through the moored boats at Stoke Gabriel - the couple aboard were actually having difficulty seeing over their bow as it was riding so high! (Obviously in a hurry to get to the pub before they stopped serving... ;))

A guy due to attend our rally at the beginning of June lost his 20' Fletcher on the Exe the week before the event - it was found sunk on it's mooring (Flipped over). The insurance assessor could apparently find no mechanical fault and put in his report that it was assumed to have been sunk by the wash of a passing vessel! :( We've had quite a few storms and thus he was checking daily, but the night it sunk was fairly subdued... The worst thing about the wash on a river is that it nearly always hits the moored boats broadside.
 
We tend to plod along at idle as if we were to run at the speed limit, the boat would be pushing a fairly reasonable bow wave - and that's where I think the problem is. Some see a speed limit as a required speed, much like they do on the road (:rolleyes:) and yet the 10kts of some areas is entirely unsuitable for some vessels in respect of wake.

And that, I think, is the crux of the problem. My marina is the base for a fairly powerful tourist boat which slips in and out several times a day at about 2.5 - 3 knots without causing a ripple. We also get visited regularly by cruise boat ribs which invariably come in at 4 knots with the wash bouncing all the moored boats. I tried to discuss this with one of the rib drivers while he was waiting for his passengers, but his line was in effect "I'm keeping to the speed limit and that's all I have to bother about."

I'm increasingly coming to the view that the Merkin "No wash" approach makes more sense than setting a specific speed limit.
 
And that, I think, is the crux of the problem. My marina is the base for a fairly powerful tourist boat which slips in and out several times a day at about 2.5 - 3 knots without causing a ripple. We also get visited regularly by cruise boat ribs which invariably come in at 4 knots with the wash bouncing all the moored boats. I tried to discuss this with one of the rib drivers while he was waiting for his passengers, but his line was in effect "I'm keeping to the speed limit and that's all I have to bother about."

I'm increasingly coming to the view that the Merkin "No wash" approach makes more sense than setting a specific speed limit.
Certainly in this area most harbour authorities include a no wash byelaw as well as a speed limit. The difficulty in having only a no wash restriction with no speed restriction is that you then encourage boats to go around congested areas on the plane.
 
Certainly in this area most harbour authorities include a no wash byelaw as well as a speed limit. The difficulty in having only a no wash restriction with no speed restriction is that you then encourage boats to go around congested areas on the plane.

We have "7 knots" and "no wash". Unofficially, if the river is deserted, it's Ok to exceed the 7 knots, as long as no wash, that obviously excludes areas where there are moorings.
 
I'm increasingly coming to the view that the Merkin "No wash" approach makes more sense than setting a specific speed limit.

Totally agree. At 8 knots we create a big bow wave and lots of wash. 8 knots against the tide and we create a tsunami. If we can't be on the plane, it's 7 knots max, down to maybe 4 if we're pushing the tide.
 
I know that not all MOBO users are unthoughtfull, likewise some yachties are also thoughtless, but I just don't get people who, like the other day, waved to us as they motored among the moorings making plenty of wash, as we were trying to pick up a mooring, and my wife was standing on the bow. They just didn't get it and were surprised when I make an exclamation (politely pointed out the error of there ways).

Is it education or arrogance. Perhaps it was unfair to start this thread as I don't mean to pick a group of fellow enthusiasts, but it just keeps happening.
 
I know that not all MOBO users are unthoughtfull, likewise some yachties are also thoughtless, but I just don't get people who, like the other day, waved to us as they motored among the moorings making plenty of wash, as we were trying to pick up a mooring, and my wife was standing on the bow. They just didn't get it and were surprised when I make an exclamation (politely pointed out the error of there ways).

Is it education or arrogance. Perhaps it was unfair to start this thread as I don't mean to pick a group of fellow enthusiasts, but it just keeps happening.

I get the impression that some water users just don't understand the consequences of their actions, they truly have no idea, today, case in point, we have a 4kt limit within 100 mtrs of the beach, because the area is full of youngsters,(under 11 years old) taking sailing lessons in soap dishes with table cloth sails, a Jetskier went through the basin at about 30kts, ok no great drama, no wash, no incident, but it could be so different if things go wrong.

And No, it's not a dig at jetskiers, it just that some people are totally blind to their actions, as for Education or Arrogance, I believe it's Uneducated (seamanship)therefore ignorance not arrogance.

All of course IMHO.
 
I thought that most harbour speed limits referred to one's speed through the water and not over the ground. If so, your wash at the 8 knot speed limit should be the same with or against the tide. How many harbour authorities use speed over the ground?

We have no facility for measuring speed through the water.

How do the harbour patrols/police ribs etc measure speed through the water with those speed guns ?
 
We have no facility for measuring speed through the water.

How do the harbour patrols/police ribs etc measure speed through the water with those speed guns ?

By laser, though it gives speed over ground, not through water.

It might be said one should be aware of the boats' speed and what the tide is doing, to guestimate SOG ?

I do find it amazing trail logs are so unavailable nowadays; when they were all that was available we all dreamed of a system to give accurate SOG, now we have GPS we hanker for trail logs ! :rolleyes:
 
By laser, though it gives speed over ground, not through water.

Was being a tad facetious there, maybe should have included a smily :)

It might be said one should be aware of the boats' speed and what the tide is doing, to guestimate SOG ?

Yes, of course. (although i assume you meant guestimate speed through the water ?) I don't tend to worry too much, i find that if i'm pushing a decent tide any more than 4 or 5 knots and the wake looks like a washing machine, just churning the water up for an extra 0.01 knot. If the tide's behind me, i might be doing 6 or 7 knots SOG, obviously a bit more through the water, if i'm not making a wash or looking like a boy racer i don't get too concerned if i'm a knot over a limit. I certainly would never even consider going through moorings on the plane :eek:
 
This will be debated for years to come so why don't we ALL, that includes
70' fast gin palaces down to 10' little speedboats, huge fast ribs to small dinghies, from small sailing dayboats and windsurfers to the well heeled 70' gentlemans yacht, that are made of grp or concrete or steel or aluminum or wood ALL get together and kick out the jetski's!?
 
This will be debated for years to come so why don't we ALL, that includes
70' fast gin palaces down to 10' little speedboats, huge fast ribs to small dinghies, from small sailing dayboats and windsurfers to the well heeled 70' gentlemans yacht, that are made of grp or concrete or steel or aluminum or wood ALL get together and kick out the jetski's!?

I would be up for that, trouble is, I can never catch the feckers!!!!:D
 
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