Two people on board and changed prop to a finer one to get the revs up to 5200.

This is the same boat two up re-engined and shows the difference between a 3 cylinder two stroke Selva 60 and a four cylinder four stroke Yamaha 80 with no other changes to the boat.

went from Falmouth to Fowey to Looe, tucked in a few fishing spots, then Looe back to Falmouth direct.
Used about 170 litres of fuel. tow a bowser next time me thinks!!!

boat fully loaded for cruising, 120 ltr. water in bow tank, 2 people, spare 8hp outboard and fuel, spare fuel and safety equipment. tides running between 2 and 4.5 kns, wind nnw 3kns sea smooth to slight. speed averaged with and against tide and wind

Very disappointed with this set up, 40Hp 4 stroke was new 2008, original 3 blade 12 x 13 prop gave identical results. Going to try a repitch on the prop down to 6 see what happens.

The boat is very new so not yet run in and engine has not been pushed hard yet.The 32 mile run was on the river Severn which was in flood so careful handling needed.The boat handled perfectly.

2 people up calm or light winds

USED FRESH WATER LOCH AWE ARGYLE 2 PEOPLE ON BOARD USUALLY WINDY WEATHER

Fitted a pair of fins on the outboard,much better, on the plain quicker and more stable..

need to go tidal so (the boat) is now getting 60 e-tec fitted, will post performance results.

I AM NOT SURE OF THE ACCURACY OF THE REV COUNTER ESPECIALLY AT MAX. CHAT. IT READ 4800RPM. FUEL FIGURES ARE VERY ACCURATE DUE TO THE NAVMAN FUEL COMPUTER I HAVE. SPEED WAS TAKEN FROM GPS. TWO PEOPLE AND 50-60 LITRES OF FUEL. TIDAL RIVER ON TAMAR WITH CURR

I have been running this boat and engine for 4 years solid and have been all over the place in all weathers and all speeds. When I do my calculations it always seems to work out at about one mile per litre of fuel. I think thats an honest and safe evaluat

wind was calm, there were two people on board about 28 stone i'd say, a backup 4hp engine, electrical generator, extra aux heavy duty battery adding to the weight.

2006 25hp 4 stroke long gone.this new 60 e-tech is economical dont know the figures but the wallet isnt complaining.3 people on board loads of gear and 12 gallons of fuel (didnt know what to expect)brought most of it back. this does not compare to 2 stro

2 persons and calm sea

new 25hp 4 stroke mariner speed taken from sat nav engine was flat out

I've added doalfins fins to the engine.This has brought top speed from 46 kmh down to 42 km but I get onto a plane alot quicker.

Did a 63km round trip mostly at 35km/h and used 35 litres of fuel.

Fully loaded with 3 Adults on board. Calm sea no wind, some swell. Speed verified with onboard speedo and iPhone Navionics Marine GPS.

1 person on boat 1 on wakeboard

4 people on board and fishing gear very choppy seas

2 people in boat approx 26 stone in weight. Into head wind and also against strong river flow. When she got going shared the skit out of me. Nice smooth & quiet engine Total weight of whole rig about 550kgs

Sorry no fuel consumtion figure or rev information. Thought speed figures might be of use though.
(yes they are ! thank you - Ed)

Many thanks to John Ayres for this info.

Inland lakes and canal use, min 3 Adults, max 5 Adults and kit. Its got a 5 gallon tank and I've never used more than half in a full days cruising.Double the revs to get the extra 2mph not worth it!!

having had a mercury 50hp 2 stroke which involved taking 2 fuel tanks. I find it incredible that I only use one 22.5ltr tank most of the time.I sometimes think its running on fresh air. as does most of the lads at our yard.

Top speed with one man on board reduces to 24 knotts with 4 people on board at 5200 revs and cruises at 17 knotts at 4200 revs. varies with wind and swell.

2 up with anchors,spare battery etc, choppy sea but low wind.
Great improvemnet on the 30hp Now I know what plane-ing really means.After a service and fresh anti fouling it does 25 knotts

Based on two adults and two children windy/ choppy conditions.
Usual max is 9 knots only gets 10 with a following sea in calm
conditions.(Saving up for a 4 stroke 70hp electric start :-)
(thanks to Bob Black for this data)

Tested at top of tide(medium wind and fairly calm conditions). No noticeable difference in top end speed with driver only or with two medium weight adult passengers, just a bit slower getting on plane and getting up to 22 mph. Could exceed the WOT top s

info supplied by Geoff Goode (see the gallery entry for pictures of his boat).

2 adults on board,aux 7.5 mercury.
Boat laden with unsual cruising items.
sea slight to moderate,wind force 3-4.

This my my 570's first trip with its lovely new engine. Handled brilliantly and I was so impressed with the speed. This was the boat with 3 people, a pile of fishing stuff, 60litres of fuel, and lots of extra weight. Can't weight to see what I'll get with

tested with old engine fitted
have upgraded to a new 70hp will edit when run in
tested with one and half people on board (my workmate was onboard, he is so small he does not count as one person)

approximate 35 miles, mixed speed, three adults plus equipment on 25 litres.sea state calm to moderate

2 people on board. Best ever speed with one person was 6.5 knots lightly loaded and with a clean bottom.

2 adults. New Prop.
Good weather conditions in Perros-Guirec, Britanny, France.
My first boat, nice speed !!

Freshwater low wind and small waves.

these details posted on behalf of Eivind Bjørgo, from Norway

Bristol floating harbour, down to Henham Lock. Used less than 30 litres in 2 days at 4-6 mph. Cardiff Bay. Mixed speeds - 5mph on the rivers Taff & Ely, up to 26mph across the bay. Used about 30 litres in the day. On the plane @ 12mph with Doelfins.

2 people aboard full fuel (10 Gallons) and water tank (45 Gallons). Figures are average on Norfolk Broads as wind,river flow and tides vary consumption. No need to go any faster at my age. I will leave that to the young ones.

All measured by GPS, 110km with 25L of GASOLINE, constantly 95% of throttle

Figures relate to calm/flat sea with 2 adults, 2 teenage children and equipment onboard.

My boat always has 3 adults and 1 child minimum it also has the high top full standing headroom cuddy extension (an extra when new).
(This data was kindly supplied by a Guest Visitor)

am used to fast ski boats and have only had this boat a few weeks,,came with a 17 alloy prop was show 52knots @ wot,,changed to a solas 19 showed 60knots,,engine lowest on transom,,lifted 1 hole,,got 65knots just,,,but held a steady 64.7knots,turns great

fully loaded, 3adults, full transom width fixed tabs, tuned engine, stainless prop, large doelfin (still cavitates under hard turns at speed) planes at about 17 knts. flat wake at 20knts, (good for skiing), very high wake from 10knts up to plane (good for

Can't remember prop radius off hand, but it's just an ally one. spectacular difference after fitting trim tabs! staight up on plane at about 12-14 knots. this with two on board.

Sea stage calm. 2 passengers, full fuel tank plus spare battery also 4bhp Mariner outboard. About 50Kg of extra gear as well

four adults = 51 stone
and load for weekend away. have had 5600rpm two up

BOAR IS FULL OF GEAR COOKERS CLOTHING FOOD WATER ETC ETC.

SHE HANDLES WELL IN SEMI ROUGH WATER, TOOK HER FROM SWANAGE PIER TO LULWORTH COVE AND BACK TOWING A DINGHY WITH A FOUR hp THREE ADULT'S TWO TEENAGER'S AND FULL OF SUPPLIES, USED ABOUT 100 LITRES

Handles pretty well on the plain have trim flaps fitted. Boat had 2 adults and loads of gear

My boat is in italy,at gaeta(lazio)and normally the sea is never quiet!the boat is equipped whith Kitchen,frigo and bath!onboard we was often 4!

starbord list, handles well on plain, medium on semi rough water

THESE FIGURES ARE FROM THE PERFORMANCE DATA SHEET THAT I HAVE FOR THE BOAT,
AIR TEMP 24C, WIND F5,TEST RUN WITH 3 PERSONS ON BOARD, TRIM PIN SET IN MIDDLE POSISTION.REST TO 29 KNOTS IN 24 SECS.HAVE SOME MORE INFO IF ANYBODY WANTS IT GET IN TOUCH.

What a terrible result !
I'll have to change the pitch or change the engine...
I've got a 12"x13" pitch prop on order, and will then update these stats...

That's better !
I've now changed the 17" pitch prop to a 13" and fitted a ruddersafe and bennet trim tabs. A huge difference in handling and performance.

Name : Stephane BUREL (France)

I think I could do with experimenting with different props to get the engine revving up to 5200.
Boat takes a while to get on the plane with 4 on board.

Travelled down the Caledonian Canal from Inverness to Fort William to Glencoe and back. Covered 152 miles and used 143 litres of petrol. 2 adults+1 child.

Going to investigate a different pitched prop as shouldn't really be getting up to 6000 rpm...

Prop pitch is way too high for engine and boat. Will be fitting a 12x11 Piranha prop, which should bring the revs up and allow the boat to plane easier. Hopefully will increase fuel economy too. Will let you know.

Two people onboard. calm wind and about 50 ltr of feul.

Figures are all accurate using a GPS and Navman fuel computer. The prop is new and the perfect pitch for the engine and boat combination. The engine now has much better fuel economy and revs to the recommended WOT of 5500rpm. Will come on the plane with f

Recently re-engined Trombone with this 4 stroke. Slightly slower than with the 60hp 2 stroke but uses half the fuel, particularly up to 5 knots when it uses a tenth of the fuel. Figures are GPS and Navman fuel monitor.

Sorry I don't have information on cruising speed since I alwayg go to WOT

Boat fitted with hydraulic trim tabs to get it up on the plane which happens at around 13 knots. Boat will not plane below 13 or 14 knots. Weight need to be forward to help planing. Engine also fitted with doel fin which definately did help get on the pla

need a bigger pitch prop,extra 300 rpm made no difference to speed,that was with 2 p.o.b. and full tank of fuel very quiet and efficient engine.

41 kts calm sea trimed propperly 2 adults + fishing gear and 75 kgs shingle balast at bow,
21 knots all day. handels calm to rough conditions well. pulls 2 skiers with ease

speeds are with 5 adults comfortably seated. billiant for pulling 2-3 skiers, toys etc great bit of summer fun loves a bit of swell just skips across the top.

Hope to get more speed by changing prop.

2 aboard in good conditions with slack tide.

Based on a following sea in calm conditions with 2 people onboard. If heading into a sea the speed and consumption is reduced a little.

Generally only 1 person aboard because of difficulty getting Crew.Cruising Bridlington Bay, Round Flamboro Head & out to sea up to about 14 miles out fishing wrecks.
I have aboard a spare 8Hp O/B Motor & carry 30 Litres Petrol for main motor,10 litres 2S

2 people on board good weather

On flat water, with just me aboard. Engine has "Standard Plastic Hydrofoils" from towsure.co.uk which definately make a difference for the trim.

Only had this boat a wee while so far, might need to add/modify details later on. Payload's usually two (large...!) adults, around 500lbs between us, plus a (guessed) 350lbs of aux engine, tanks, fishing paraphernalia. She doesn't like heading into any so

I HAD TO REIFALSE THE TRANSOM TO PUT THIS ENGINE ON BUT NOW FAST

i was sking for 2 hours and used 50 litres it was nice weather and carm i was nice to be out

Heavy boat. Fantastically composed ride. Handles solent chop with ease. Very relaxed cruiser and engine perfect match. Speed taken 3 up, full of fuel and cruising gear. Wants to fall off the plane at around 16 knots though. Doel fins help, and volvo QL tr

clean bottom just antifould,2persons up with spare engine and fishing gear.

all the measurement were taken with 2 people onboard .
very econmical engine at cruising speed.but boat does become a bit unstable at speeds over 30kn and very uncomfortable.
i use my boat for fishing in solent so this engine seems to be what i have nee

Mercury is from the 70's, Johnson from 80's, both flat out with 2 people on board and equipment. reading taken from GPS. Johnson on it's own under same conditions gives 12 knots. Just bought Evinrude 2 stroke 100 hp, not tested it yet. I think the fuel b

Boat cruises nicely at 18 kts, and fuel consumption is good as long as I dont open it up fully. Planes very quickly even with 5 people onboard.

thought id add my old engine details as thay may be of some use.

dont know the prop just bought the boat

1 or 3 person dont make the big difference

slight swell boat handled well. two adults on board. We did'nt push her for too long at max speed as fuel consumption was poor

Obviously under powered for a Speedwell and I intend to get a 60hp engine for the 2010 season. Fuel consumption seems to be about 1 Litre per knot per hour. Always towing the dinghy and in coastal waters.

Produces large wake or bow wave. No tacho for RPM... sorry, 3 onboard (2 adults and 1 child). Nothing really heavy. Aux Seagull Silver Century OB in cabin floor and another time when attached to bracket. Speed measured by GPS

GPS used to measure speed, very frugal, very quiet, various speeds used to test engine over choppy/rough water, approx 1 gallon (5 litres) used over 45 mins. - will be updated shortly. 1 onboard, aux seagull in cabin, fuel moved forward to ballance load.