Reply
 
Thread Tools Search this Thread
 
Old 28 May 2017, 08:45   #1
Member
 
Country: UK - England
Town: Keyhaven
Boat name: Orion
Make: Bombard
Length: 5m +
Engine: Outboard Honda 50HP
Join Date: May 2017
Posts: 157
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?
__________________
BigE is offline   Reply With Quote
Old 28 May 2017, 12:45   #2
Member
 
Country: UK - England
Town: Retford
Boat name: Spy-sea-one
Make: Excel 435
Length: 4m +
Engine: Suzuki Outboard/25/4
Join Date: Oct 2011
Posts: 7,441
RIBase
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?
__________________
jeffstevens763@g is offline   Reply With Quote
Old 28 May 2017, 13:15   #3
Member
 
Country: UK - England
Town: Keyhaven
Boat name: Orion
Make: Bombard
Length: 5m +
Engine: Outboard Honda 50HP
Join Date: May 2017
Posts: 157
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?
__________________
BigE is offline   Reply With Quote
Old 28 May 2017, 13:19   #4
Member
 
Country: UK - England
Boat name: Bluefin
Make: Ribcraft
Length: 5m +
Engine: 150hp
MMSI: Ex Directory
Join Date: Oct 2015
Posts: 342
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.
__________________
gpsguru is offline   Reply With Quote
Old 28 May 2017, 13:23   #5
Member
 
Country: UK - England
Town: Keyhaven
Boat name: Orion
Make: Bombard
Length: 5m +
Engine: Outboard Honda 50HP
Join Date: May 2017
Posts: 157
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.
__________________
BigE is offline   Reply With Quote
Old 28 May 2017, 13:28   #6
Member
 
Country: UK - England
Town: Retford
Boat name: Spy-sea-one
Make: Excel 435
Length: 4m +
Engine: Suzuki Outboard/25/4
Join Date: Oct 2011
Posts: 7,441
RIBase
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
Attached Files
File Type: pdf Ranieri Revolution 15 - DF50A (Lean Burn) (1).pdf (255.6 KB, 94 views)
__________________
jeffstevens763@g is offline   Reply With Quote
Old 28 May 2017, 16:43   #7
Member
 
Country: UK - England
Town: Keyhaven
Boat name: Orion
Make: Bombard
Length: 5m +
Engine: Outboard Honda 50HP
Join Date: May 2017
Posts: 157
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.
__________________
BigE is offline   Reply With Quote
Old 28 May 2017, 18:29   #8
Member
 
Country: UK - England
Town: Retford
Boat name: Spy-sea-one
Make: Excel 435
Length: 4m +
Engine: Suzuki Outboard/25/4
Join Date: Oct 2011
Posts: 7,441
RIBase
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
__________________
jeffstevens763@g is offline   Reply With Quote
Old 28 May 2017, 19:01   #9
Member
 
Country: UK - England
Town: Keyhaven
Boat name: Orion
Make: Bombard
Length: 5m +
Engine: Outboard Honda 50HP
Join Date: May 2017
Posts: 157
No rev counter unfortunately, the throttle is on full. I've adapted the trim and it's as fast as I could get.
__________________
BigE is offline   Reply With Quote
Old 29 May 2017, 14:59   #10
Member
 
Country: UK - Scotland
Town: Lismore
Boat name: Jinty J
Make: Rib-X 535
Length: 5m +
Engine: Evinrude 75 Etec
Join Date: Jun 2013
Posts: 43
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?
__________________
Ceejay is offline   Reply With Quote
Old 29 May 2017, 16:23   #11
Member
 
Country: UK - England
Town: Keyhaven
Boat name: Orion
Make: Bombard
Length: 5m +
Engine: Outboard Honda 50HP
Join Date: May 2017
Posts: 157
My prop is in a sorry state, one blade is bent, one has a small chunk taken out of it and the other is nicked. I was thinking of just fitting a new one.

The current prop is 11.1 inch diameter with a 15" pitch

As I said, a new prop is probably in order to go with the new carbs being fitted this week. I'm told the engine compression is great so once the carbs are fitted I'll move on to the prop.

It doesn't help that there seems to be a lot of water build up in the hull so even with pumping it all out I've probably got the weight of a small child in it just sloshing around.
__________________
BigE is offline   Reply With Quote
Old 29 May 2017, 16:27   #12
Member
 
Country: UK - England
Town: Keyhaven
Boat name: Orion
Make: Bombard
Length: 5m +
Engine: Outboard Honda 50HP
Join Date: May 2017
Posts: 157
Just added to my post above the current prop is 11.1 inch diameter with a 15" pitch, 3 blade.
__________________
BigE is offline   Reply With Quote
Old 30 May 2017, 07:21   #13
Member
 
Country: UK - England
Town: Retford
Boat name: Spy-sea-one
Make: Excel 435
Length: 4m +
Engine: Suzuki Outboard/25/4
Join Date: Oct 2011
Posts: 7,441
RIBase
to be brutal you're peeing in the wind with all the issues you have prop, water, carbs, revs,
you could get the revs sorted by buying a tiny tach equivalent for around twenty quid you need that to select a prop ok you're props damaged but its a base to start at if you dont want to spend at this present time. you're sorting the carbs so one step in the right direction, you need to get rid of the water issue is your drain plug leaking? thats a quick fix if it is carrying extra weight sloshing around will dramatically reduce performance.
have a look at SSI MARINE OUTBOARDS for a new prop i got one for £62 for my 25hp
__________________
jeffstevens763@g is offline   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off




All times are GMT. The time now is 02:37.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2024, vBulletin Solutions, Inc.