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Showing results 1 to 25 of 104
Search took 0.00 seconds. Search: Posts Made By: Perna
Forum: Monohull Sailboats 12-08-2023, 23:57
Replies: 30
Views: 3,180
Posted By Perna
Re: Speed while motoring

Is it not just simply the previous owner doubled the power of the engine without changing the prop?

If the original prop got to the engine rated speed then doubling the power will have no effect,...
Forum: Seamanship & Boat Handling 06-05-2023, 21:25
Replies: 55
Views: 6,472
Posted By Perna
Re: Raising the Main Solo

Your problem is being able to steer upwind when standing up by the mast.

You can probably do this by running a line from each side of the tiller out through a stanchion or pushpit, up each side...
Forum: Engines and Propulsion Systems 30-01-2023, 07:18
Replies: 23
Views: 1,830
Posted By Perna
Re: Outboard HP for my Monohull

My vote also goes to renovating or renewing the inboard. Outboards are just a pain in the transom on anything but calm sunny days. :)
Forum: Engines and Propulsion Systems 30-01-2023, 07:01
Replies: 38
Views: 3,824
Posted By Perna
Re: Generator won't start

I was going to suggest trying it on ether just to confirm it is a fueling problem. But you say it won't start on ether. This implies the fueling could be fine and the problem lies elsewhere

Good...
Forum: Our Community 03-01-2023, 03:06
Replies: 76
Views: 6,242
Posted By Perna
Re: What boats have you owned?

Nice thread....

Heron dinghy; one design racing, great fun
Lysander 17' cruiser; used to sleep 5 on there, great fun and learnt a lot
Caprice 19' cruiser; a step up as it was not wood...
Forum: Engines and Propulsion Systems 03-12-2022, 01:13
Replies: 26
Views: 3,094
Posted By Perna
Re: Vetus diesel shakes at idle

Rubber engine mounts can get stiffer as they get older which means that the resonant speeds, shaking that is, move up into the engine idle range or higher.

They are laid out so that the resonant...
Forum: Lithium Power Systems 27-08-2022, 05:53
Replies: 41
Views: 3,645
Posted By Perna
Re: Cell based lithium charging why not.

Sorry, :(

AxV = Watts which is power, and Watts x Time (seconds) = Joules, which is energy.
Forum: Anchoring & Mooring 22-07-2021, 11:56
Replies: 61
Views: 13,663
Posted By Perna
Re: Best knot for tying stern line to rocks when med mooring

Just a comment, which I hope doesn't derail the thread; I've never really understood the desire to back up to the rocks for an overnight stay unless there is a real shortage of space. You see boats...
Forum: Marine Electronics 05-08-2019, 09:13
Replies: 32
Views: 6,503
Posted By Perna
Re: How to build a 12-volt transistor burglar alarm?

There are any number of these systems on the market.
...
Forum: Electrical: Batteries, Generators & Solar 31-07-2019, 09:47
Replies: 59
Views: 19,537
Posted By Perna
Re: Why are flexible solar panels catching fire?

I am not an expert but as I understand it there is a major difference between domestic roof top type systems and 12/24 V marine systems. Basically most domestic systems consist of several panels...
Forum: Monohull Sailboats 01-07-2019, 12:03
Replies: 70
Views: 6,378
Posted By Perna
Re: Cost per hour of running engine

Not sure why you would need to change the oil and filter after 50 hours. Most car engine specify around 20000 miles, say 600 hours conservatively. Little difference in the duty cycle.
Forum: Engines and Propulsion Systems 23-05-2019, 08:18
Replies: 21
Views: 9,041
Posted By Perna
Re: Diesel engine won't start

+1 for starter fluid just to get it going

Good luck.
Forum: Engines and Propulsion Systems 23-05-2019, 08:04
Replies: 16
Views: 9,570
Posted By Perna
Re: Perkins no power under load

Most turbo diesels have a small pipe coming from the inlet manifold to measure the boost and allow more fueling. If this is split or leaking you don't get the extra fuel to produce the full power...
Forum: Construction, Maintenance & Refit 09-09-2018, 14:45
Replies: 23
Views: 4,646
Posted By Perna
Re: Mast rake , can effect mast pumping??

What I meant was if the baby stay is tight enough to induce a bit of mast bend then the mast would not be free to move or rattle at mid height. Not in the dock anyway.

Pumping proper I think...
Forum: Construction, Maintenance & Refit 09-09-2018, 00:00
Replies: 23
Views: 4,646
Posted By Perna
Re: Mast rake , can effect mast pumping??

My own two cents..

If you have a fractional rig with a babystay but in-line spreaders, not swept back spreaders, then you have nothing to stiffen up the mast bend which would be produced from the...
Forum: Our Community 08-09-2018, 23:32
Replies: 22
Views: 4,780
Posted By Perna
Re: Eagles CAN take off from the water!

Ok not eagles but where I live in Switzerland we have Buzzards and Kites, (wingspan 4.5 and 6 foot respectively).

One particular buzzard obviously had its nest and young in some nearby woods and...
Forum: Engines and Propulsion Systems 26-08-2018, 22:21
Replies: 15
Views: 8,689
Posted By Perna
Re: Volvo Penta md2020 exhaust 100% blocked with white gunk

Just my thoughts:

How far in did the white stuff go? Are the exhaust ports now clear right down to the valves?

If the white stuff got to the valves there is a good chance they are not seating...
Forum: Engines and Propulsion Systems 10-08-2018, 11:41
Replies: 13
Views: 1,626
Posted By Perna
Re: After tune up blues-update!

The valves would appear 'taller' due to valve and valve seat wear. If the valve clearances are not reset in time, or they are set too tight during an overhaul then it can become a vicious circle....
Forum: Electrical: Batteries, Generators & Solar 07-08-2018, 02:24
Replies: 51
Views: 11,337
Posted By Perna
Re: Lead Crystal Batteries in Australia

Hi L and N,
do you have a 12V or a 24V system? Cos if its 24V you should not use 200 amps charging.
Forum: Electrical: Batteries, Generators & Solar 06-08-2018, 22:49
Replies: 51
Views: 11,337
Posted By Perna
Re: Lead Crystal Batteries in Australia

StuM, I don't think you can forget how they were wired. If you say the 10h rate is 260 Ah that means they each need 52A. Each battery in series gets the same current so each bank also needs only 52A....
Forum: Electrical: Batteries, Generators & Solar 06-08-2018, 11:49
Replies: 51
Views: 11,337
Posted By Perna
Re: Lead Crystal Batteries in Australia

I'm not an expert so someone please tell me I'm wrong.

It seems kind of counter-intuitive if you have a battery getting hot and expanding to then have to increase the charging current. I'd want to...
Forum: Engines and Propulsion Systems 06-08-2018, 10:12
Replies: 114
Views: 13,322
Posted By Perna
Re: Yanmar 2QM1. Head gasket leaking

Glad it was successful.
Forum: Engines and Propulsion Systems 31-07-2018, 11:12
Replies: 114
Views: 13,322
Posted By Perna
Re: Yanmar 2QM1. Head gasket leaking

I used to do calculations for these MLS gaskets, so some comments if I may which may help. The black coating is the gasket suppliers concoction of some sort of filled PTFE which rubs off the beads...
Forum: Engines and Propulsion Systems 31-07-2018, 07:08
Replies: 114
Views: 13,322
Posted By Perna
Re: Yanmar 2QM1. Head gasket leaking

The indentations (beads) in the gasket do the sealing around the water/oil passages. Each of these beads also has a coating for the micro sealing of the surface roughness, so I don't see any need or...
Forum: Engines and Propulsion Systems 20-07-2018, 21:23
Replies: 114
Views: 13,322
Posted By Perna
Re: Yanmar 2QM1. Head gasket leaking

Hi,

Nice job on the exhaust!

I agree the problem is not to re-analyse the failure, just to understand it.

When it comes to reassembly you could place the new gasket on the clean head and...
Showing results 1 to 25 of 104
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