View Poll Results: Prop Height
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4" Below
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0 |
0% |
3" Below
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0 |
0% |
2" Below
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4 |
25.00% |
1" Below
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4 |
25.00% |
Level
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5 |
31.25% |
1" Above
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3 |
18.75% |
2" Above
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0 |
0% |
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14-06-2006, 08:27 PM
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#1
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Registered User
Country: UK
Location: Weston Super Mare
Occupation: Electrical Engineer
Join Date: Mar 2004
Location: Weston Super Mare
Posts: 6,351
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Running height of gear case on mono hull
So what height does everyone think is best for all round running on a mono hull??
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14-06-2006, 08:32 PM
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#2
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Registered User
Country: uk
Location: Bristol area
Occupation: Electrician
Interests: mmm stella
Boat make: 16 reiver
Engines: mercury 125 optimax
Cruising area: Lyme Bay
Join Date: Mar 2006
Location: Bristol area
Posts: 344
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depends on prop
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14-06-2006, 08:59 PM
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#3
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Registered User
Location: GOLDEN MILE
Boat name: LILY THE PINK AND TERMINATOR 11
Boat make: PHANTOM 21 AND 20
Engines: 2.5 EFI X 2
Join Date: Mar 2004
Location: GOLDEN MILE
Posts: 2,475
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Ran my p18 1" below.
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PLEASE DON'T STEAL...THE GOVERNMENT DON'T LIKE THE COMPETITION
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14-06-2006, 09:02 PM
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#4
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hello
Join Date: Mar 2004
Posts: 2,739
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I guess it depends on the hull too. What works on one may not work on another.
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14-06-2006, 09:38 PM
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#5
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numbskull
Country: United Kingdom
Location: South
Occupation: none
Interests: none
Boat name: Leviathan
Boat make: Phantom 28
Cruising area: South Coast
Join Date: Mar 2004
Location: South
Posts: 15,959
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definitely depends on firstly the hull, ie, is it stepped, or regular 'V' bottom, then on the prop type.
You'll need some drive line depth, to get the thrust line low enough to keep the bows up at the higher speeds. If you can't keep the bow light, it'll feel like it wants to swap ends (and probably will)
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"I Agree with everything you say really!" - John Cooke to Jon Fuller - 26-01-2013
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14-06-2006, 09:52 PM
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#6
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Registered User
Boat make: Phantom 23
Join Date: Mar 2006
Posts: 1,693
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Not a clue ! but i like the "2 below votes cus that means we wont have to cut down the transom!!
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14-06-2006, 09:55 PM
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#7
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Registered User
Country: UK
Location: Weston Super Mare
Occupation: Electrical Engineer
Join Date: Mar 2004
Location: Weston Super Mare
Posts: 6,351
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Quote:
Originally posted by PuppiesBalls
Not a clue ! but i like the "2 below votes cus that means we wont have to cut down the transom!!
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thats posted as a bolted on the transom question.
if you have a lifter u get the best of both worlds. real low for good handling in rough and mega high for ultimate speed on flat water
no point going any higher than 2" above cus you will loose water pressure but 4" below is great for handling
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14-06-2006, 09:57 PM
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#8
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hello
Join Date: Mar 2004
Posts: 2,739
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7" of travel on your lifter and your only going to let it go down to 2" below.
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14-06-2006, 10:00 PM
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#9
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Registered User
Boat make: Phantom 23
Join Date: Mar 2006
Posts: 1,693
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Quote:
Originally posted by Burty
thats posted as a bolted on the transom question.
if you have a lifter u get the best of both worlds. real low for good handling in rough and mega high for ultimate speed on flat water
no point going any higher than 2" above cus you will loose water pressure but 4" below is great for handling
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well 4" below is also 1.5 inch cut out the transom!!!
Jon, Ian,, all you guys in the know, doya think its worth cutting the transom down to allow the engine to go 4" below? as JBD said we have a 7" lift gorilla so that would still allow us to have the engine 3" above.
Opinions please
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14-06-2006, 10:02 PM
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#10
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Registered User
Country: UK
Location: Weston Super Mare
Occupation: Electrical Engineer
Join Date: Mar 2004
Location: Weston Super Mare
Posts: 6,351
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Ian's transom is cut
You have spent all that money but you are going to sacrifice optimum usage because you don't want to cut a bit of wood out of a 14 year old boat
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14-06-2006, 10:07 PM
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#11
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hello
Join Date: Mar 2004
Posts: 2,739
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I'm in agreement with Burty
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14-06-2006, 10:12 PM
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#12
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Registered User
Boat make: Phantom 23
Join Date: Mar 2006
Posts: 1,693
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Quote:
Originally posted by Burty
Ian's transom is cut
You have spent all that money but you are going to sacrifice optimum usage because you don't want to cut a bit of wood out of a 14 year old boat
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it aint just a bit of wood ! its the top of the 'kin transom!
aint as old as ur 20 year old boat
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14-06-2006, 10:14 PM
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#13
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Registered User
Country: UK
Location: Weston Super Mare
Occupation: Electrical Engineer
Join Date: Mar 2004
Location: Weston Super Mare
Posts: 6,351
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Quote:
Originally posted by PuppiesBalls
it aint just a bit of wood ! its the top of the 'kin transom!
aint as old as ur 20 year old boat
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But I aint scared of drilling holes and cutting transoms if it make me boat bettererer and me boats 19 not 20
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14-06-2006, 10:17 PM
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#14
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Registered User
Location: GOLDEN MILE
Boat name: LILY THE PINK AND TERMINATOR 11
Boat make: PHANTOM 21 AND 20
Engines: 2.5 EFI X 2
Join Date: Mar 2004
Location: GOLDEN MILE
Posts: 2,475
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I had my new p18 cut down to fit a shortshaft, must admit I didn't like doing it.
__________________
PLEASE DON'T STEAL...THE GOVERNMENT DON'T LIKE THE COMPETITION
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14-06-2006, 10:22 PM
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#15
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Registered User
Boat make: Phantom 23
Join Date: Mar 2006
Posts: 1,693
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Quote:
Originally posted by Burty
But I aint scared of drilling holes and cutting transoms if it make me boat bettererer and me boats 19 not 20
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obviously!!
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15-06-2006, 07:35 AM
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#16
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Registered User
Country: England
Location: Cornwall
Occupation: Civil Engineer in the water industry
Interests: Powerboat racing, travel, curries, zimmers
Boat name: "N" Class fabrication
Boat make: B23
Engines: 200XS
Cruising area: Torbay & Falmouth
Join Date: Jul 2005
Location: Cornwall
Posts: 478
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Quote:
Originally posted by PuppiesBalls
well 4" below is also 1.5 inch cut out the transom!!!
Jon, Ian,, all you guys in the know, doya think its worth cutting the transom down to allow the engine to go 4" below? as JBD said we have a 7" lift gorilla so that would still allow us to have the engine 3" above.
Opinions please
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The reason that I have cut my transom is in order to run a 15" leg, this has lowered the C.O.G. so the handling is better. I do not like lifters or setback so my gearcase is level with the keel. We have found this the best we can get in all conditions. We know we are slow in calm water but we were never going to keep up with cats or batboats with a "skiboat". By adding the setback we found the handling compromised without an appreciable increase in speed, so we removed it. I also dont like all the "bling" hanging off the arse-end cos it is something else that can let you down in a race and puts undue stress on the transom.
As I said in my PM to you a little while ago, with all that power why do you want a lifter? I would cut down the transon and bolt the motor on directly. But that is just my view.
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15-06-2006, 08:52 AM
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#17
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Registered User
Boat make: Phantom 23
Join Date: Mar 2006
Posts: 1,693
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Thanks Ian
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