Hi Dave,
I like your boat....I was looking enviously at her a while back when she was moored up on the visitors pontoon outside the prince william, before i decided to go for the harbour pilot because i couldn't find one that suited me as i just want it for pleasure fishing and cruising. She is in good shape, i really like the lines of the older ones, there is nothing else like them and certainly a very capable sea boat
Not sure what speed you should get with 335hp, i know they were very well built so i would guess heavy too but i am sure Simon, Harold and Chas on here, could help you out on that score!
Probably bump into you soon as we both have boats in Brixham so will say hello.
Good luck.
Dave.

Hi Dave

The speed would depend to a certin extent on what type of keel you have amongst other things.

Stugsy has a Lochin 33 which looks as if it came out of the same yard as mine and within a few weeks judging by the fit out but there are major differences. 

Mine is the long wheelhouse (sports cruiser) varient and has the full keel with the bar under the prop. It's currently fitted with a single 300HP Perkins Sabre.

I believe Stugsy's has the standard wheelhouse (a bit less weight) and a cut away keel with a P bracket (less underwater drag). I also seem to remember Stugsy having something like a 350HP engine.

Mine cruises at around 12k (depending on cleanliness of hull) and about 16k or so flat out.

I think Stugsy's cruises at about 14 to 15k and probably does about 19 or 20k flat out.

C0ckpits always seem a bit of a comprimise. A mate of mine has a Persuit 30 (an American sprots fishing boat) and on that the deck is only about 4" above the water and the gunwales are at thigh height. It's great for fishing out of as the gunwales are lower than your gimbal belt and because the gunwales are so close to the water; it's very easy to reach over to release fish. However if it's a bit rough, you don't feel that secure. 

My deck is 6"or so above the water and the c0ckpit coaming is at about gimbal belt height so it's more secure and as I use it mostly as a cruising boat I can live with it but you can't lean over and get close to the water which isn't good for releasing fish.

If I just wanted a full blown fishing boat, I would be very tempted to lower my deck by a couple of inches then remove the coaming altogether but life's too short for that!

I totally agree with you on modern designs - it's quite obvious that the designers have never been fishing in their lives and if they have it was for nothing bigger than mackerel.

Cheers

Chas

Hi Stu
Thanks for that information. Do you have any pics of your prop/keel arrangement?

It might be that I have so much fishing tackle and junk onboard that I need to run a bit lighter to get some higher speeds?
I have plenty of power from the 6C 335 hp Cummins and could increase it another 50hp without too much problem but then the fuel economy suffers as they all do when you put the hammer do down, (no pain no gain!)
regards
Dave.

Hi Dave

As you can see, my keel is quite different to Stugsy's - more drag but less chance of damaging the prop.

I need to check the spec of my prop next time the boat's out of the water.

Hi Stu

Remind me again please, what is cruising revs and max revs on yours?

I cruise at 2000rpm with 2500 as maximum.

Cheers

Chas 

I also run a 4 bladed 22 x 22 prop but was also thing about putting a larger pitched prop on as she revs out at 2600 very very easily and I think the engine could do would some more load putting on it. She doesn't jet over the hump until 2100 rpm fully loaded.
Has any one fitted a bigger pitch prop than 22 ?

How much difference do trip tabs make to hump and top speed?

regards

Dave

Hi Dave

The guy that I bought mine from bought a 333 Harbour Pilot with, I believe, a 350 Cat and it had trim tabs fitted.

I once asked him about trim tabs (as I was thinking of fitting them) and he gave me the impression that they didn't increase speed but by trimming the bow down he actually lost speed and had to be careful how he used them.

I can believe that, after all; you wouldn't expect an aeroplane to go faster with the flaps down.

Cheers

Chas

Hi Dave

It seems that you have already answered your own previous question regarding the trim tabs.

Mine, like most others, does ride bows up. Doesn't cause me a vis problem but trimming the bow down would help when the missus is driving.

I did consider fitting them (still open to the idea as well). The people at Bennett sware blind they will work wonders (of course) but so far, after a few conversations other Lochin owners who have trim tabs, I'm yet to be convinced of their value.

I can get the bows down when the missus is driving simply by throttling back then she's happier and I burn less fuel. She only normally drives for relatively short periods when I'm checking other things or want a break.

No, I haven't got any answers regarding your prop pitch question but I know a couple of the guys on here have single 400 to 500 hp engines (Harold and Robbie Diesel) so they may be able to answer. 

Also, with 400 or 500 hp under the floor trim tabs may become more advantageous.

Cheers

Chas


-- Edited by chas on Thursday 20th of August 2009 05:12:13 PM

Hi Stu

Apologies for not getting back sooner but been away on holiday. (Yep, with the missus on the boat but only stooging around in the Solent)

I'll have to check my performance out like you did.

It seems like not exactly a night and day difference by fitting the trim tabs. On the down side, there's more to damage and snag fishing lines on. Different, I'm sure with bigger engines than mine.

I fitted the factory spray deflector rails a few years ago (same time as I fitted a bow thruster) and they made hell of a difference. They turned a very wet boat into quite a dry boat and I would thoroughly recommend them to anyone who hasn't got them fitted.

I saw a fuel flow meter at last year's Southampton show that interfaced with the GPS to calculate and indicate MPG. The one I saw was still quite expensive and wasn't that elegant but I'm sure it's only a short time before the likes of Raymarine catch on.


Once we get those fitted, I reckon we will all be throttling back.. well sometimes!

Cheers

Chas