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Old 28 May 2017, 03:45   #1
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Country: UK - England
Town: Keyhaven
Boat name: Orion
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Length: 5m +
Engine: Outboard Honda 50HP
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What speed

I was out enjoying the boat yesterday and all was fine but I wondered if it was all working as well as it should. A bit of a vague question but, here goes:

What speed (MPH or Knots) would you expect a Bombard Explorer with a 50HP Honda engine on the back and 1 adult + two light weight children to achieve?

The sea conditions were a bit choppy if that makes any difference.

Any guesses?
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Old 28 May 2017, 07:45   #2
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Country: UK - England
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Boat name: Spy-sea-one
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What were you getting or had no way of knowing there's a phone app that will tell you I get 22 knots with a 25
Is the explorer a rib?
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Old 28 May 2017, 08:15   #3
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According to my phones GPS it said I was achieving about 22mph which seemed slow. It's a 5.5m RIB with a Honda 50HP 4 stroke.

I just don't know if it should be able to go faster or not.

Do you mean you get 22knots with a 25HP engine? What size boat?
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Old 28 May 2017, 08:19   #4
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I would think 22mph (19knts) is about right ................. 50hp is pretty small for a 5.5m RIB ........... I would be looking at an minimum of 75 - 90 hp .

My 4.2m RIB has 40hp which gives me a shade over 30knts(35mph) flat out.
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Old 28 May 2017, 08:23   #5
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That's good to know, I was aware 50HP was a bit small. We're going to keep it for this year and then next spring we'll upgrade to something a bit more beefy.

I'm going to get some new carbs fitted as it's running a bit flat so that may help, compression is good on all cylinders and it's been given a good service.
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Old 28 May 2017, 08:28   #6
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look on the suzuki site they have some engine performances with different boats not the same as you i know but you might get some info to compare
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Old 28 May 2017, 11:43   #7
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Thanks for that, I'll take a look.

As the weather improved this afternoon we went for a quick blast. Lovely being able to do that on a whim. About 15 minutes from door to being on the water.

The sea today is a lot calmer and the speed nudged up to 24mph off Hurst Spit.
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Old 28 May 2017, 13:29   #8
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Quote:
Originally Posted by BigE View Post
Thanks for that, I'll take a look.

As the weather improved this afternoon we went for a quick blast. Lovely being able to do that on a whim. About 15 minutes from door to being on the water.

The sea today is a lot calmer and the speed nudged up to 24mph off Hurst Spit.
What revs are you at anywhere near the maximum range and have you played with trim both can hold her back
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Old 28 May 2017, 14:01   #9
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No rev counter unfortunately, the throttle is on full. I've adapted the trim and it's as fast as I could get.
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Old 29 May 2017, 09:59   #10
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What speed

I used to get 27 knots with a 50 hp Suzuki on a Valiant 4.9DR. That was flat out with one up,and a clean hull with hard tubes. I would guess that your prop is perhaps on the course side and you're not pulling max revs, which in turn is not good for the engine. What pitch is your prop, think mine was 13 inches?
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