|
05-03-2006, 12:53 PM
|
#1
|
Registered User
Country: uk
Location: brighton
Occupation: CABINET MAKER
Interests: SPEED BOATS,MOTO G.P
Boat name: MOTIVATION
Boat make: MARSHAN 21
Engines: AINT GOT ONE!!
Cruising area: sea
Join Date: Sep 2005
Location: brighton
Posts: 1,223
|
stupid question!
what is the theory behind off setting your outboard?
is it as i understand to counter act the prop wanting to turn the boat to the right? if so how does it work??
__________________
__________________
Taurus excreta cerebrum vincit
|
|
|
05-03-2006, 01:03 PM
|
#2
|
Registered User
Join Date: Mar 2004
Posts: 5,724
|
Re: stupid question!
Quote:
Originally posted by michaelcaine
what is the theory behind off setting your outboard?
is it as i understand to counter act the prop wanting to turn the boat to the right? if so how does it work??
|
its to couteract prop torque, normally applies to high hp small boat scenarios.
if you mounted a high hp motor on a smallish boat in the centre, then the prop spinning clockwise would have the opposite effect on the boat, the boat will want to turn anti clockwise, hence moving the outboard over to the stbd side counteracts this.
__________________
|
|
|
05-03-2006, 01:05 PM
|
#3
|
Registered User
Country: uk
Location: brighton
Occupation: CABINET MAKER
Interests: SPEED BOATS,MOTO G.P
Boat name: MOTIVATION
Boat make: MARSHAN 21
Engines: AINT GOT ONE!!
Cruising area: sea
Join Date: Sep 2005
Location: brighton
Posts: 1,223
|
ta dude
__________________
Taurus excreta cerebrum vincit
|
|
|
05-03-2006, 05:32 PM
|
#4
|
Registered User
Country: Denmark
Location: Sweden
Occupation: Planning my next boatcraze
Interests: Boats and Boats
Boat make: Fletcher 199 Bravo Superlight Version
Engines: Mariner 200
Cruising area: Danish Westcoast and Oresundsarea, Swedish lake
Join Date: Nov 2005
Location: Sweden
Posts: 131
|
Exactly - I have seen several boats with the outboard offset to one side. Some argue that you can counteract just as well setting the toque tab, but to my knowledge this will give the boat a tendency to lean over to one side at high speed...
On my Fletcher 199 the engine was offset about 3 -4 cm, and it
remained level at maximum speed ( after driving throug a bit of chinewalking )..
Troels
__________________
Its all about performance..
|
|
|
05-03-2006, 06:13 PM
|
#5
|
Registered User
Country: UK
Location: Weston Super Mare
Occupation: Electrical Engineer
Join Date: Mar 2004
Location: Weston Super Mare
Posts: 6,351
|
mines mounted dead centre dude and i've never had any trouble. just mout all the heavy stuff on the stbd side like the battery and trim pump etc.
|
|
|
05-03-2006, 07:30 PM
|
#6
|
Registered User
Location: Essex
Boat make: Phantom 21
Engines: Merc 2.5efi
Join Date: Mar 2005
Location: Essex
Posts: 337
|
Dead centre, the way to go.
|
|
|
05-03-2006, 07:59 PM
|
#7
|
Registered User
Country: england
Location: the grim north
Occupation: robot
Cruising area: tyne
Join Date: Nov 2004
Location: the grim north
Posts: 915
|
[QUOTE]Originally posted by Burty
[B]mines mounted dead centre dude and i've never had any trouble. just mout all the heavy stuff on the stbd side like battery AND YOURSELF
__________________
Speed costs weight so what do we cut off first
|
|
|
05-03-2006, 09:19 PM
|
#8
|
Registered User
Country: Essex
Location: Great Stambridge Essex
Occupation: Director Paving company
Interests: Boating/Squash
Cruising area: Essex Marina/crouch southeast coast
Join Date: Sep 2004
Location: Great Stambridge Essex
Posts: 2,033
|
Mines offset
__________________
[
|
|
|
05-03-2006, 09:38 PM
|
#9
|
Registered User
Country: United kingdom
Location: West Sussex
Occupation: Grease Monkey
Interests: Makin my boat faster!
Boat name: S.B Racing
Boat make: Ocke mannerfelt canopied B23 / Zapcat
Engines: Merc 200XS Gen 2 / Tohatsu 50
Cruising area: littlehampton/Southampton
Join Date: Jan 2005
Location: West Sussex
Posts: 2,656
|
Mines offset on my phantom! And i seem to remeber JF posting on here that steve baker said the best set up for a p21 with a black max 200 was 1" offset!
__________________
Class 3C Mono EPA National speed record holder 95.35 mph Avg!
|
|
|
05-03-2006, 09:57 PM
|
#10
|
Registered User
Country: UK
Location: South West
Boat make: Cyclone/ Cyclone/Rinker
Engines: Merc 2.5 efi's/300XS/5.0 v8
Join Date: Feb 2005
Location: South West
Posts: 592
|
Dead centre on my P21
|
|
|
05-03-2006, 09:58 PM
|
#11
|
Registered User
Join Date: Mar 2004
Posts: 6,891
|
Opinions on this subject are like arseholes - everyone's got one.
IMVHO there is no hard and fast answer - offset is just one part of the boat setup, and therefore can't be considered on it's own. Every other bit of how you set the boat, and how you intend to use the boat, will also have an impact.
If it were me, I'd put the motor on where the previous engine was, save myself the hassle of filling holes in, and not worry about.
|
|
|
05-03-2006, 10:01 PM
|
#12
|
Registered User
Country: uk
Location: brighton
Occupation: CABINET MAKER
Interests: SPEED BOATS,MOTO G.P
Boat name: MOTIVATION
Boat make: MARSHAN 21
Engines: AINT GOT ONE!!
Cruising area: sea
Join Date: Sep 2005
Location: brighton
Posts: 1,223
|
that sounds very good to me,but it is interesting that some say dead centre and others off set,doing that is a long way off for me thou!
__________________
Taurus excreta cerebrum vincit
|
|
|
05-03-2006, 10:22 PM
|
#13
|
Traveling
Country: UK
Location: Alderholt
Occupation: Aerospace
Boat name: T/T D2S
Boat make: Midas 27' Cat, Argo 16 Cat. Avon Rib Thingy
Engines: Merc 280-ROS -JSRE,65Xs, 75 Stinger, Yam 60
Cruising area: Any Seedy Bar
Join Date: Sep 2004
Location: Alderholt
Posts: 4,225
|
If it was me I'd phone Terry or Colin, or ask little Pete on here.
For whats it's worth I'm an offset person.
Edit: I could have phrased that last bit better !!!!!
__________________
It is impossible to lick your elbow.
Team25Racing.com
At least 75% of people who read this will try to lick their elbow!
|
|
|
05-03-2006, 10:32 PM
|
#14
|
Registered User
Country: United kingdom
Location: West Sussex
Occupation: Grease Monkey
Interests: Makin my boat faster!
Boat name: S.B Racing
Boat make: Ocke mannerfelt canopied B23 / Zapcat
Engines: Merc 200XS Gen 2 / Tohatsu 50
Cruising area: littlehampton/Southampton
Join Date: Jan 2005
Location: West Sussex
Posts: 2,656
|
My marshan 19 was offset 1" and i was running an xr2! Used to fly nice and level for me! BUT it used to "stuff" easy if ya let the nose drop abit!!
__________________
Class 3C Mono EPA National speed record holder 95.35 mph Avg!
|
|
|
06-03-2006, 10:01 AM
|
#15
|
Registered User
Country: UK
Location: Weston Super Mare
Occupation: Electrical Engineer
Join Date: Mar 2004
Location: Weston Super Mare
Posts: 6,351
|
you will get better drive with the engine mounted in the centre which probably means a better top speed. As i said you can achieve the same as offsetting by mounting all the heavey stuff on the stbd side.
|
|
|
06-03-2006, 10:26 AM
|
#16
|
Traveling
Country: UK
Location: Alderholt
Occupation: Aerospace
Boat name: T/T D2S
Boat make: Midas 27' Cat, Argo 16 Cat. Avon Rib Thingy
Engines: Merc 280-ROS -JSRE,65Xs, 75 Stinger, Yam 60
Cruising area: Any Seedy Bar
Join Date: Sep 2004
Location: Alderholt
Posts: 4,225
|
It's about usable speed. The P21 that I raced with Howard could have been set up to go quicker but we took the usable route. We werent the quickest on a calm day but average to rough was where the advartage lay, could keep the power on when others were lifting off. That set up worked very well. There is no hard fast rule it's suited to the driving style/preference of the individual
__________________
It is impossible to lick your elbow.
Team25Racing.com
At least 75% of people who read this will try to lick their elbow!
|
|
|
06-03-2006, 05:51 PM
|
#17
|
Registered User
Country: uk
Location: brighton
Occupation: CABINET MAKER
Interests: SPEED BOATS,MOTO G.P
Boat name: MOTIVATION
Boat make: MARSHAN 21
Engines: AINT GOT ONE!!
Cruising area: sea
Join Date: Sep 2005
Location: brighton
Posts: 1,223
|
little petes was offset and i think from memory the colin said offset too,about an inch i think
__________________
__________________
Taurus excreta cerebrum vincit
|
|
|
|
Thread Tools |
|
Display Modes |
Linear Mode
|
Posting Rules
|
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts
HTML code is Off
|
|
|
|
» Recent Threads |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|