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Message board > Engines > Changing and downsize

Message 13 of 13
Posted by member Mark Dell on Thursday 3 October 2019

Thatís strange I bought Ruby Ann from a chap who had it on brokerage
If you want to move to a quieter location Harleyford is lovely

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Message 12 of 13
Posted by member Rob on Thursday 3 October 2019

Hello Mark
Sorry for the delay in replying, my boat is currently at Shepperton, although I may be planning to move it soon.
I think it depends on how long you intend to keep your boat, as to whether you downsize the engine. In my case if I was only using it on non tidal water, I would not bother.
Have fun
Rob

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Message 11 of 13
Posted by member Mark Dell on Monday 30 September 2019

That should read where abouts on the Thames are you?

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Message 10 of 13
Posted by member Mark Dell on Monday 30 September 2019

Hi Rob thanks for the reply
I am probably deciding to keep the 75 and work on techniques to handle it a bit more.
Where about son the Thames are you? I am in Marlow at Harleyford
Thanks for the advice
Mark

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Message 9 of 13
Posted by member Rob on Friday 27 September 2019

Hello Mark
I have a Navigator with a 50hp Mariner Big foot, 4 stroke, based on the mid Thames. This is a similar power to weight ratio as yours.
I need the 50hp for when I go to the Tidal Thames, Medway and round the coast.
I do not feel it uses a noticeable amount of petrol than a 25hp engine when going 5 mph on the non tidal Thames.
I would not be in a hurry to downsize the engine.
It can also help with the marketability, if you have a 75 hp engine, if you go to sell it as these boats are popular on estuaries and someone may travel to buy it.
Hope to see you on the water.
Rob

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Message 8 of 13
Posted by member Keith Lewcock on Tuesday 24 September 2019

Hi Simon
My boat is a River Pilot made in 1989. I note that an article from this web site referring to the Family Pilot states that "In 1996 the stern and the keel were modified. The outboard well and transom could now accommodate the Honda 75 4 stroke and the keel was reduced to a max depth of two inches"

A Hardy Marine brochure for the River Pilot states "The maximum recommended engine size is 40hp"
It is somewhat confusing but I wonder whether time, experience and outboard development will allow me to attach a much larger engine or was the River Pilot really limited to 40hp? How different was the hull and transom from the Family Pilot?

Hope you can help.

Kind regards
Keith

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Message 7 of 13
Posted by member Simon Papendick on Monday 23 September 2019

Hi Keith,
The 75 hp engine is more than up to the job when going coastal cruising and it was the largest engine we recommended to go on the back of a Hardy Pilot.

Regards

Simon Papendick

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Message 6 of 13
Posted by member Keith Lewcock on Sunday 22 September 2019

Hi Simon and Mark
I have a river pilot with a Yamaha 25hp four stroke with a high thrust propellor. It provides plenty of thrust but will only clock up about 6.5knots to 7 max. Cruising at 5knots.
I would like to go faster and off shore but would like to know what size engine I could install. Could it take 75hp.
I am also interested in the Hydrofin as manouvering at slow speeds is a dog.

Thanks

Keith

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Message 5 of 13
Posted by member Simon Papendick on Saturday 21 September 2019

Hi Mark,
On the Thames they would find it hard to sell on that size engine. On the south coast it would be easier to sell that size engine. It may be an idea to contact one of the south coast dealers to see if they would give you a better deal on exchanging your engine for a smaller engine. Just an idea.

Regards
Simon Papendick

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Message 4 of 13
Posted by member Mark Dell on Friday 20 September 2019

TBH they only offered me £1200 for that beast of an engine- I think I will keep it!

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Message 3 of 13
Posted by member Mark Dell on Thursday 19 September 2019

Thanks Simon I was thinking the same

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Message 2 of 13
Posted by member Simon Papendick on Thursday 19 September 2019

Hi Mark,
I would go for a 30 hp this will give you the right balance
Regards
Simon Papendick

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Message 1 of 13
Posted by member Mark Dell on Thursday 19 September 2019

I have just bought a lovely Hardy Bosun 20 built in 2001
The engine fitted is the Mariner 75hp Optimax an absolute beast but far too much for the Hardys retirement pottering around the Thames.
I have been in negotiations with a dealer about part exchanging this unit for another Mariner
What HP do everybody advise? I was thinking of around 20hp

Thanks in advance

Mark

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