Reply
 
Thread Tools Search this Thread
 
Old 18 July 2012, 10:09   #1
Member
 
Country: UK - England
Town: Saltash
Make: Ribcraft 4.8 shiny
Length: 4m +
Engine: ETec 60. Very shiny
Join Date: Mar 2012
Posts: 39
Humber Assault info request

Anyone using a 5m Assault with a 50hp?
I'm thinking about putting a 50hp etec on one and I would really appreciate any performance info.

Top speed with 3 divers, fuel consumption, time to get onto the plane etc
thanks
__________________

__________________
congerman is offline   Reply With Quote
Old 18 July 2012, 10:32   #2
Member
 
Country: UK - Scotland
Boat name: Wildheart
Make: Humber/Delta Seasafe
Length: 5m +
Engine: Merc 60 Clamshell
MMSI: 235068449
Join Date: Apr 2007
Posts: 4,611
I can't comment directly on the Assault, but my old Seasafe is on a par with it with regard to weight & length - and was originally supplied with a 40.

When I got it, it had a 1970s rated 55, so probably only 50-ish at the prop. Performed fine. On paper, the Assult has a shallower V, so time to plane etc should be less than mine which being deeper V needs a bit more speed before it "lifts out". (going the other way, think of a flat bottomed boat - it will plane almost instantly).

I wouldn't expect any performance issues with that combo. Other thing is, if in the fullness of time you want to up-HP your setup, the bolt holes are the same between a 50 & a 75.

Hopeully you'll get an Assault owner along soon with "harder" data. In the meantime, I hope this helps.
__________________

__________________
9D280 is offline   Reply With Quote
Old 18 July 2012, 10:38   #3
Member
 
Country: UK - England
Town: Saltash
Make: Ribcraft 4.8 shiny
Length: 4m +
Engine: ETec 60. Very shiny
Join Date: Mar 2012
Posts: 39
Wow that was quick! Thanks very much.
__________________
congerman is offline   Reply With Quote
Old 19 July 2012, 04:21   #4
Member
 
chewy's Avatar
 
Country: UK - England
Town: Up Norf
Make: Avon SR4,Tremlett 23
Length: 4m +
Engine: Yam 55, Volvo 200
Join Date: Apr 2007
Posts: 5,217
Quick little boats, I found with the one that I used that if going slow in choppy water it would come over the bow.
Cheap and cheerful and 5m with a 50hp on will be ok.
__________________
chewy is offline   Reply With Quote
Old 19 July 2012, 11:19   #5
Member
 
Country: UK - England
Town: London
Length: 4m +
Join Date: May 2011
Posts: 265
We own a 5.5m Humber Assult with a 60HP 2-stroke Yamaha.

We top out at about 30 knots if travelling light, about 28 knots with 4 people on board.

In terms of planing, we struggle to get there below 12 knots (which is very annoying on the Thames now), it handles beautifully at 14-16 knots however, with very heavy steering at low speed, sub 5 knots.

In terms of fuel consumption, 30 litres can just about get us from Kew to Greenwich and back, approximately 3 hours at an average of around 12 knots, although our throttle is a bit strange at the mo, so thats very much acceleration then deceleration, so perhaps could get you further with better handling!

In short a newer 50hp engine should be perfectly adequate!
__________________
vjmehra is offline   Reply With Quote
Old 19 July 2012, 14:02   #6
Member
 
Country: UK - England
Town: Saltash
Make: Ribcraft 4.8 shiny
Length: 4m +
Engine: ETec 60. Very shiny
Join Date: Mar 2012
Posts: 39
Many thanks
__________________
congerman is offline   Reply With Quote
Old 19 July 2012, 14:03   #7
Member
 
Country: UK - England
Town: Saltash
Make: Ribcraft 4.8 shiny
Length: 4m +
Engine: ETec 60. Very shiny
Join Date: Mar 2012
Posts: 39
Quote:
Originally Posted by chewy
Quick little boats, I found with the one that I used that if going slow in choppy water it would come over the bow.
Cheap and cheerful and 5m with a 50hp on will be ok.
Thanks chewy
__________________
congerman is offline   Reply With Quote
Old 20 July 2012, 14:49   #8
Member
 
Country: UK - Wales
Town: west wales
Make: humber destroyer 5m
Length: 5m +
Engine: 90 yamaha
Join Date: Apr 2010
Posts: 202
assault

Hi
I use a couple of 5 metre assaults one with a 40 honda injection and one with a 90 two stroke yamaha.
The main feature of the assault seems to be that the tubes are mounted lower on the hull than most other ribs, which means that the boat is easier to climb into from the water but that the tubes drag in the water at speed and give a bumpy ride in rough water.
Even with a 90 and the engine mounted high I'm only getting 40 knots on GPS.
However even with a forty four stroke the boat planes ok however many people are in it as long as you spread the weight around.
Hull shape is a fairly deep v ,I think the only drawback for use in rough water is the tube height.
Which is why the destroyer and ocean pro have the tubes mounted much higher up.
__________________
bosun is offline   Reply With Quote
Old 20 July 2012, 15:15   #9
Member
 
Country: UK - England
Town: NW& wherever the boat is!
Boat name: depends on m'mood!
Make: Humbers/15-24m cats
Length: 6m +
Engine: etec130/big volvos
MMSI: many and various
Join Date: Nov 2001
Posts: 1,815
we had a 4.3 with a 50 four stroke on it. Very quick and extremely horrible. The hull/tube shape is akin to a cathedral hull with all the disadvantages that go with them. Only advantage is that with the tubes deflated it doesnt take up much room. There are much, much better Humbers
__________________
Dave M
www.wavelengthtraining.co.uk
wavelength is offline   Reply With Quote
Old 20 July 2012, 15:29   #10
RIBnet supporter
 
Pikey Dave's Avatar
 
Country: UK - England
Town: South Yorks
Boat name: Black Pig
Make: Ribcraft
Length: 5m +
Engine: DF140a
MMSI: 235111389
Join Date: Feb 2008
Posts: 7,596
RIBase
I recall diving off an assault in the early 80's, very wet, uncomfortable & stuffed into every wave.
__________________
Rule#2: Never argue with an idiot. He'll drag you down to his level & then beat you with experience.
Rule#3: Tha' can't educate pork.
Rule#4: See rule#5
Pikey Dave 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





Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -5. The time now is 18:53.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.