Clearing a rope around the prop.

[Portofino]

So why don't all motor boats have a prop hatch like the above????

Fairley Obvious answer --- if your arms are shorter than the W/L distance to the shaft ,never mind the prop- then short of a million years of evolution -to evolve 1M - 2M arms -how are you going to reach ?
Admittedly on shallow draft little boats like a canal boat or the example quoted above then sure .
Would not work on my boat -props too deep and I have not got a syndrome - -normal human arm span

 

[westernman]

Fairley Obvious answer --- if your arms are shorter than the W/L distance to the shaft ,never mind the prop- then short of a million years of evolution -to evolve 1M - 2M arms -how are you going to reach ?
Admittedly on shallow draft little boats like a canal boat or the example quoted above then sure .
Would not work on my boat -props too deep and I have not got a syndrome - -normal human arm span

I am going to lash a bread knife to the end of my 10 foot long boat hook.
Unless your motor boat is the size of the Queen Mary 2, that should be plenty long enough.

 

[oldgit]

So why don't all motor boats have a prop hatch like the above????

A it is practical suggestion,so not worthy of considering.
B.It is below the water line,unable to be admired by fellow marina dwellers or able to have a nubile 16 year old young lady in a swim suit photograph draped over it for your sales brouchure ?


The result of not putting your shore lines securely "ashore" before moving off.
No faffing with anything is going to shift this,

 

[beltsandbraces]

would not want to go in the water to clear that of the prop just in case mum and dad are around.

 

[jon and michie]

Right for Duncan99210 and Portifino.

1 it was a mere suggestion
2 in the diving world it is probably not a re breather because wait for it - IT IS NOT USED IN THE DIVING WORLD.
3 As explained earlier it is used for short periods of time
4 ideally need huet training (helicopter underwater escape training) so you know how to use the kit properly
5 don't assume about the breathing and hyperventilating etc as when I am travelling offshore we have to wear immersionsuits which have a head cover and gloves of a wetsuit material to reduce the effects of the cold water
6 suggest you read all that I posted earlier for a better understanding of the kit
7 it the offshore world it is known as a re- breather because the one of the first actions you take is to blow into the 3rd lung or bag sand then re breathe the oxygen that you haven't used up.

To go one further if you want to go the diving route the new kit we use is a compressed air system that will last between 12 and 15 minutes.

As I said it was a mere suggestion to put an idea out there - yes everybody has an opinion but try to see all angles before shooting someone down - and 1 question to those who doubt is - Have you been offshore or had helicopter escape training ????

Jon

 

[Portofino]

Right for Duncan99210 and Portifino.

1 it was a mere suggestion
2 in the diving world it is probably not a re breather because wait for it - IT IS NOT USED IN THE DIVING WORLD.
3 As explained earlier it is used for short periods of time
4 ideally need huet training (helicopter underwater escape training) so you know how to use the kit properly
5 don't assume about the breathing and hyperventilating etc as when I am travelling offshore we have to wear immersionsuits which have a head cover and gloves of a wetsuit material to reduce the effects of the cold water
6 suggest you read all that I posted earlier for a better understanding of the kit
7 it the offshore world it is known as a re- breather because the one of the first actions you take is to blow into the 3rd lung or bag sand then re breathe the oxygen that you haven't used up.

To go one further if you want to go the diving route the new kit we use is a compressed air system that will last between 12 and 15 minutes.

As I said it was a mere suggestion to put an idea out there - yes everybody has an opinion but try to see all angles before shooting someone down - and 1 question to those who doubt is - Have you been offshore or had helicopter escape training ????

Jon

Where do I start with this ??
I,ll answer the q1 you ask in the last paragraph .

30 odd years ago I was one of two airborne anaesthetists in the Parachute Regiment in the Army .
Yes -done copter "dunk test " + a lot more more +++++ I,d rarther not write about -thanks

For anybody reading this Do not attemp to use the apparatus suggested by "Jon and michie" or an extended snorkel of any significant depth -to clear fowling of your props -there is a significant to certain risk you will black out -unconscious under water = and die .

either -hold your breath and come up when your body tells you
Or use pressurised air .

To "Jon and michie " -how do expect a person to stay under ( never mind health risk ) with a bag full of air and wearing a life jacket ? .
Won,t work anyhow ? Practically ??

 

[Portofino]

View attachment 56935

would not want to go in the water to clear that of the prop just in case mum and dad are around.

Keep the faith ----- you should be armed with the " serrated bread knife " Mum and dad will run ( sorry swim ) a mile when you flash that at them

Seriously it's actually bent the blades -so new props here -must have vibrated like hell on the run in

 

[Blue Sunray]

Where do I start with this ??
I,ll answer the q1 you ask in the last paragraph .

30 odd years ago I was one of two airborne anaesthetists in the Parachute Regiment in the Army .
Yes -done copter "dunk test " + a lot more more +++++ I,d rarther not write about -thanks

For anybody reading this Do not attemp to use the apparatus suggested by "Jon and michie" or an extended snorkel of any significant depth -to clear fowling of your props -there is a significant to certain risk you will black out -unconscious under water = and die .

either -hold your breath and come up when your body tells you
Or use pressurised air .

To "Jon and michie " -how do expect a person to stay under ( never mind health risk ) with a bag full of air and wearing a life jacket ? .
Won,t work anyhow ? Practically ??

Feel better now?

This sort of petty pointy posting seems more common (thankfully) in raggie scuttlebutt than here.

 

[Portofino]

Feel better now?

This sort of petty pointy posting seems more common (thankfully) in raggie scuttlebutt than here.

I was happy to leave it with post # 58 adding to Duncan from a physiological view .
But the guy just keeps coming back ---look back .
No intention of your suggestion of "petty pointing " what ever that means ,

He did ask indeed invited Duncan and myself to respond and directed a " q1 " in the last paragraph -so out of politeness I answered -rarther than rudely blank him .

I thought going through each of the numbered points would be too tedious and lead to further side shows .
Hence I wrote "where do I start with this "

Just trying to avoid an avoidable underwater incident , surely that's a good thing ,and if means it attracts ridicule from you -so be it .
I thought that's the whole point of a forum -sharing of knowledge etc .

How would you have responded please .?

 

[jon and michie]

To "Jon and michie " -how do expect a person to stay under ( never mind health risk ) with a bag full of air and wearing a life jacket ? .
Won,t work anyhow ? Practically ??[/QUOTE]

Right to answer your last question.

The life jacket is not inflated otherwise how would you expect to escape from a chopper that has inverted or sank ???
This equipment wasn't around 30 odd years ago.

You have your opinion's and I have mine so lets mutually agree to disagree.
I do thank you though for not just blanking me.

Jon

 

[Montemar]

Many thanks to all who replied to this thread.
What is clear is that going down to clear a prop is not to be undertaken lightly and certainly not whilst out at sea.
If the boat could be anchored in shallow water then it may be possible to have a go under calm conditions without any breathing apparatus.
Better get rope cutters as a first line of defence, two engines obviously better than one.