Glastron gs249

Oy,

I make sure Kim changes your name to...

<font color=red>Red</font color=red>Dreamer

...........once you've gone all magalufff on us /forums/images/icons/wink.gif .



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Personally I'd go for The V8 petrol for that size of boat, unless its a bloody big Yanmar diesel..

Regarding all the petrol leak stories going around... Buy as new as you can and you shouldn't have any problems..

Martyn, Solitaire. Remember....

Petrol Rules../forums/images/icons/laugh.gif/forums/images/icons/laugh.gif



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Petrol Rules..
 
No it's........

'PETROL FOOLS'

I've just ordered a few special Burgees with the above motto, for You, MedMartyn, Dave S, et all, for Xmas. Hope you'll fly them with pride!

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Sorry but i'll be flying my new personalized burgee that i've just ordered from Haydn.

Now where did i put that soup.../forums/images/icons/laugh.gif



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Petrol Rules..
 
Next time you come "down south" make time to come out with me -. I think you'll see what Martyn and I mean - now get back to work /forums/images/icons/smile.gif

<hr width=100% size=1>Boating is <A target="_blank" HREF=http://www.powerboat-training.co.uk>Serious</A> Fun
 
I was on the other PC - now I'm back on this !/forums/images/icons/smile.gif

<hr width=100% size=1>Boating is <A target="_blank" HREF=http://www.powerboat-training.co.uk>Serious</A> Fun
 
Agreed

All agreed martyn and duncan. I guess I just read his question differently. He basically said (I think) he was worried about the white knuckle ride aspect, and not the money. He even acknowledged diesel is easier on wallet. Thus, petrol V8 praps suits him better than 150 diesel. I agree that a 150 diesel is the better allrounder choice for normal Solent boater

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wonder if anyone would consider changing their 2litre car petrol engine to a V8, given the fuel consumption probably for about 5 minutes

<hr width=100% size=1><A target="_blank" HREF=http://www.suncoastmarine.co.uk>Sun Coast Sea School & Charter</A>
 
Thanks for all the replys guys,I do my boating in poole out to studland tow a skier,try to kill the kids on the donut,nearly worked on one occasion!! my boat a maxum 1900 sc with a 4.3 V6 with the original prop it works hard to come to plane with a full load,but tops about 48mph,dropped pitch and gets out the hole lovely now but top speed compromised,but as you say usual cruising is about 25 mph which is still bumpy on the average sea in the bay! yes I still would like to play so really think the V8 is abetter bet for me but when I get my sensible head on and the misses is invlolved the diesel always wins still I think she is coming round as the regal 2465 is her favorite,ho ho get my way in the end!!

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I will simply ask you this -
how often this year have you run round to Lulworth Cove, Durdledoor or Worbarra Tout (West) or Alum Bay etc (East)?
All fantastic places to visit in a small boat and well within the range etc of your existing boat at under an hour's run.
any how, whatever you do, keep in touch and I look forward to seeing you on the water. At least a couple of the guys (and gals) on here run out of Poole in small boats most weekends.

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Reading back my last post seems that all i do is hammer about yes we use the boat for what it is but also when on our own cruise gently and do overnight ,been to the IOW stayed over,thats when we miss the ammenities of a slightly larger boat,sleeping between the porta potti ,lovely!!, ment all season to visit lulworth kept looking at the range areas and put myself off didnt fancy being target practice.

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Re: Lulworth ranges.....

apart from target practice and outrunning patrol boats livening up the day /forums/images/icons/smile.gif they close down for the whole of August and average 4 weekends firing a year.
Portland include details in their Routine Maritime Conditions broadcasts and don't mind being called up and asked if fireing is going on either (seem to prefer it to a radio check!)
Hope you sort out your new toy OK, but look forward to a run next year in any event.

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Hi

I have to agree with you on the torque issue it is nonesense to say BHP is everything about performance, torque ( the 'turning force') is very much needed to give the engine the force to be able to overcome weight and drag to reach the revs where the BHP is at its highest. No point having 400hp and 100ft/lb torque in anything with weight as it wouldnt have the torque to be able to over come the weight and drag to allow the engine to rise to its peak operating revs and thus peak BHP. Earlier in the thread somebody said that car with 300bhp and 300 torque will always be quicker than 200bhp and 400 torque this I believe to be wrong and is very much dependent on gearing ( if talking about cars) and again I agree that boat power torque etc is very different in relation to performance than that of a car as prop slip etc comes into equation.



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Kevin, you say "No point having 400hp and 100ft/lb torque in anything with weight as it wouldnt have the torque to be able..." Yes it would. If it is developing 400hp it is developing 400hp, period. Even if it only produces 1 lb ft torque it doesn't matter. It would be doing a million+ rpm, so you would gear it down and then it would produce more torque at the output shaft at any given output shaft rpm (or more rpm for a given torque) than (say) a 399hp engine.

Likewise my claim that a 300bhp/300 torque car will always be quicker than 200bhp/400 torque does, as you say, depend on gearing. I meant (and should have said, sorry) that an appropriate gearbox is needed in each case, but in the real car/boat world it would be.

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my speed / rev curve for a BIII drive tends to suggest less than that in the mid range but a little more at the top end where I would expect drag to be a bigger factor. It' s definitely not a racing hull and, if I remember correctly deepV hulls require more HP for any give speed and that would tend to suggest that they would experince more prop slip rather than less?

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I hear what you are saying, but I was talking more that the engine can produce 400hp at its peak, and therefore if the engines torque is low, my example being 100 ft/lb, then the engine would not have the turning force to reach the revs required to reach its maximum power band and thus its maximum 400hp power. you may have to drop prop pitch, allowing for the low torque, to enable the revs to rise up to its peak power band to produce 400bhp.

Unless Ive misunderstood you you have presumed that this 400hp is being produced at any rev band the engine happens to be in but this peak power output can only be over a specific rev range and thus relies on the torque of the engine to enable those revs to hit that specific range to produce the maximum power - for example 6 ton boat with engine capable of 400hp at say 4000 revs but only a 100 ft /lb torque wouldnt have the turning force to push the boat forward fast enough to allow the revs to reach 4000 to enable the 400hp maximum output.


Kevin

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