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Old 30 August 2016, 05:51   #11
Member
 
Country: UK - Scotland
Town: Ardfern
Boat name: Moon Raker
Make: Humber Destroyer
Length: 5m +
Engine: Honda BF 90 D
MMSI: 235035994
Join Date: May 2006
Posts: 694
[QUOTE=breezeblock;727934]how do you find the 90 on your humber what length is it[/QUOTE

Destroyer 5.3 metres. The boat was originally supplied with a Mercury 90hp four stroke in 2000. I broke the gearbox on that. :-(

Compared to the Mercury, the Honda is considerably lighter, which upset the balance of the boat noticeably. (ISTR Humber vary the position of the console and tank to get the correct fore and aft CoG and mine is placed well forward to balance the heavy Mercury) I corrected the trim by stowing the little dinghy I carry aft instead of forward.

The Honda is much quieter. Optimum revs. for economy seem to be 4200-4400, about 500 higher than the Merc. The Honda seems to have less torque at low speeds, but you can feel the 'punch' when the VTEC kicks in around 4,500 rpm. At high speeds it is less thirsty, but fuel consumption seems about the same, or only slightly better, than the Merc at cruising speed.

I usually cruise at between 4200 and 4400 rpm, giving between 23 and 25 knots. My average fuel consumption is 1.40 miles per litre, 0.71 litres per mile, 8.42 litres per hour.

I'm not sure I like the separate trim and tilt rams, compared to the Mercs single ram, but that's a minor niggle. There are lots of fish farms around here, and Honda is the engine of choice for all their small craft.

I'm very pleased with mine.
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Old 30 August 2016, 11:41   #12
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Country: UK - Scotland
Town: denny
Boat name: breezy
Make: humber
Length: 5m +
Engine: mariner 115
MMSI: 235913962
Join Date: May 2016
Posts: 371
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[QUOTE=alystra;728004]
Quote:
Originally Posted by breezeblock View Post
how do you find the 90 on your humber what length is it[/QUOTE

Destroyer 5.3 metres. The boat was originally supplied with a Mercury 90hp four stroke in 2000. I broke the gearbox on that. :-(

Compared to the Mercury, the Honda is considerably lighter, which upset the balance of the boat noticeably. (ISTR Humber vary the position of the console and tank to get the correct fore and aft CoG and mine is placed well forward to balance the heavy Mercury) I corrected the trim by stowing the little dinghy I carry aft instead of forward.

The Honda is much quieter. Optimum revs. for economy seem to be 4200-4400, about 500 higher than the Merc. The Honda seems to have less torque at low speeds, but you can feel the 'punch' when the VTEC kicks in around 4,500 rpm. At high speeds it is less thirsty, but fuel consumption seems about the same, or only slightly better, than the Merc at cruising speed.

I usually cruise at between 4200 and 4400 rpm, giving between 23 and 25 knots. My average fuel consumption is 1.40 miles per litre, 0.71 litres per mile, 8.42 litres per hour.

I'm not sure I like the separate trim and tilt rams, compared to the Mercs single ram, but that's a minor niggle. There are lots of fish farms around here, and Honda is the engine of choice for all their small craft.

I'm very pleased with mine.
what is the performance like as i am unsure that the bf75 will have enough oomph
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Old 03 September 2016, 12:35   #13
Member
 
Country: UK - Scotland
Town: Ardfern
Boat name: Moon Raker
Make: Humber Destroyer
Length: 5m +
Engine: Honda BF 90 D
MMSI: 235035994
Join Date: May 2006
Posts: 694
[QUOTE=breezeblock;728048]
Quote:
Originally Posted by alystra View Post

what is the performance like as i am unsure that the bf75 will have enough oomph
Max speed I've managed, with a lot of gear aboard, (camping stuff, boat tent, 80 litres fuel, heavy ground tackle) is 39 knots. I hardly ever go there.

I changed the prop to a Solas Rubex 13.2 x 19 inch pitch. This is perfect for the boat as I use it, but with four people aboard including me, she takes a while to get over the hump and on the plane. With five hefty passengers plus me, she won't get going. Even at full throttle, the revs. won't climb high enough to get any power.

However, with the supplied Honda 17 inch pitch prop she took off like lightning, was under propped for my usual load, and would have probably managed the five heavy chaps quite well. It's that experience that makes me think that, compared to the Mercury, this engine doesn't have as much torque at low revs. At medium and high revs. I think the Honda is better and more responsive - but that may be because it's the engine I chose.
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