45 degree take off - Page 2

JSP · 27 January 2009, 17:45

Quote:

Originally Posted by Nasher

Sorry to hear about the finger mate, could have been a lot worse by the sound of it though.

As everyone has alread said it is a largish lump you have on the back, but are you sure its trimming right in?

My old 150 Johnson had a stop bar/pin that could be adjusted in a series of holes to limit the amount the engine would trim in. I eventually threw it away so it sat on the cast in stops as I was sure it wasn't in far enough.
Got any close up piccies of it trimmed in so we can see?

Nasher.

Cheers Nasher, yeah could have been allot worse as my hand was covering my face.

I can't trim the engine down at the moment as the battery is off and with my hand done in I can't get it back on.
Just took this with it trimmed up if that tells you anything?

JSP · 27 January 2009, 17:51

Quote:

Originally Posted by Nos4r2

Pretty much bang on then-you might be able to swing using a 13x21" but there's not a lot of point unless you want to hit warp speed.

Nah, setting the boat up right is the easier option! It'll make a BIG difference getting the fuel forwards-your engine alone weighs as much as my engine and 75 litres of fuel...

So can rule the prop out then. Warp speed you say? hhhmmm

Like you and chewy said, the tanks do need going forward. Even with them set up in the middle under the console it will still need going forward. May just get one large tank to replace the two 25l to save on space as well.

Nos4r2 · 27 January 2009, 17:55

Quote:

Originally Posted by JSP

So can rule the prop out then. Warp speed you say? hhhmmm

Like you and chewy said, the tanks do need going forward. Even with them set up in the middle under the console it will still need going forward. May just get one large tank to replace the two 25l to save on space as well.

Yep, warp speed

If the 19 is in Ok condition, I've got a nearly new 13x21" K series prop here I'll swap for it if you want to try silly speeds

If you've got some bostik and a bit of spare hypalon, glue it over the flooding hull holes without keying the hull and try it out. That way if you don't like it you can just peel it off.

JSP · 27 January 2009, 18:03

Quote:

Originally Posted by Nos4r2

Yep, warp speed

If the 19 is in Ok condition, I've got a nearly new 13x21" K series prop here I'll swap for it if you want to try silly speeds

If you've got some bostik and a bit of spare hypalon, glue it over the flooding hull holes without keying the hull and try it out. That way if you don't like it you can just peel it off.

You can see in the photo it's just missing some paint

So does a 21 just give you more top end? And I'm guessing more fuel goes with it too

Got sent some black Hypalon by mistake so will use that instead of returning it

PeterM · 27 January 2009, 18:05

Quote:

Originally Posted by JSP

From what I've read trim tabs are better but hydrofoils are the easier option?

Pretty much , but as Nos says with the weight of boat , motor & water you will be putting a big load on the leg. I've seen hard boats with 100ish HP have them , but no ribs.

I've only seen fins on small ribs - bigger boats go for trim tabs of some kind - but I think your size sits somewhere in the middle !

Nos4r2 · 27 January 2009, 18:06

Quote:

Originally Posted by JSP

You can see in the photo it's just missing some paint[/img]

So does a 21 just give you more top end? And I'm guessing more fuel goes with it too

Bit more top end,bit less acceleration, revs will be slightly lower at WOT and your cruising fuel consumption will drop slightly

Quote:

Originally Posted by JSP

Got sent some black Hypalon by mistake so will use that instead of returning it

Bargain!

Blackroady has a good point in what he says above about not seeing ribs with doelfins on. I can imagine some damage being caused to the AV plate as it slaps back down after going airborne.

JSP · 27 January 2009, 18:08

Quote:

Originally Posted by Blackroady

Pretty much , but as Nos says with the weight of boat , motor & water you will be putting a big load on the leg. I've seen hard boats with 100ish HP have them , but no ribs.

I've only seen fins on small ribs - bigger boats go for trim tabs of some kind - but I think your size sits somewhere in the middle !

Think I'll look into this when I've got the boat set up better. And have it as an "if all else fails" option. Cheers mate

JSP · 27 January 2009, 18:10

Quote:

Originally Posted by Nos4r2

Bit more top end, revs will be slightly lower at WOT and your cruising fuel consumption will drop slightly

Bargain!

Blackroady has a good point in what he says above about not seeing ribs with doelfins on. I can imagine some damage being caused to the AV plate as it slaps back down after going airborne.

Come on there must be a BUT with the 21?

Like I say I'll leave them for now but if it comes to it those auto tabs look good.

Nos4r2 · 27 January 2009, 18:21

Quote:

Originally Posted by JSP

Come on there must be a BUT with the 21?

Less acceleration. That's about it really... but if you're using the boat heavily laden a lot I'd stick with the 19.

Pete7 · 27 January 2009, 18:29

What I think you need is Nos42s engine rather than just the prop. You have an awfull lot of weight on the back end of a short rib and a 90 might be a better balanced outfit.

However if you plan to change the consoles around then you will want to put as much weight up the sharp end. The flooding hull is only at the back end which is just were you don't want it so couple of corks and a tennis ball should block the hull up nicely so you get a chance to see what it handles like without the flooding hull.

Had a Yam 115 on an Osprey 5.25, feck it was quick with 17" prop

and quite able to throw you off the back of the console. Only tamed it by putting the engine on a 5.95 Osprey. Superb engine though so look after it carefully. I still have a spare stator and coils if they play up btw.

Pete

Nos4r2 · 27 January 2009, 18:33

Quote:

Originally Posted by Pete7

What I think you need is Nos42s engine

Don't give him ideas-he ain't having it

JSP · 27 January 2009, 18:34

Quote:

Originally Posted by Nos4r2

Less acceleration. That's about it really... but if you're using the boat heavily laden a lot I'd stick with the 19.

If you've still got it after I've got the boat set up as I want it I may swap with ya mate.

JSP · 27 January 2009, 18:39

Quote:

Originally Posted by Pete7

What I think you need is Nos42s engine rather than just the prop. You have an awfull lot of weight on the back end of a short rib and a 90 might be a better balanced outfit.

However if you plan to change the consoles around then you will want to put as much weight up the sharp end. The flooding hull is only at the back end which is just were you don't want it so couple of corks and a tennis ball should block the hull up nicely so you get a chance to see what it handles like without the flooding hull.

Had a Yam 115 on an Osprey 5.25, feck it was quick with 17" prop

and quite able to throw you off the back of the console. Only tamed it by putting the engine on a 5.95 Osprey. Superb engine though so look after it carefully. I still have a spare stator and coils if they play up btw.

Pete

It's is over powered but, but, but..........

Sounds daft but I'm not a speed freak. I likes that engine though.
Now you've said that about the water inside the hull being at the back it makes sense due to the shape of a hull.
And I hope I never have to buy those bits of you but keep them safe please

JSP · 27 January 2009, 18:39

Quote:

Originally Posted by Nos4r2

Don't give him ideas-he ain't having it

Tight git

biffer · 27 January 2009, 19:00

thats a hell of a torquey (is that a word) old lump to hang on the back of that boat, i think you need to put a lot of weight just fwd of midships for balance, imo if you put it to far fwd it may tend to stuff, my only concern is that you will kill yourself before you get it right, go out again with a few people and move them around in the boat to see whats best, and if you do kill yourself can i have your boat

Nasher · 27 January 2009, 19:01

Looks like you have the holes for the stop bar but don't have one in there.

Was worth a look.

Nasher.

JSP · 27 January 2009, 19:11

Quote:

Originally Posted by biffer

thats a hell of a torquey (is that a word) old lump to hang on the back of that boat, i think you need to put a lot of weight just fwd of midships for balance, imo if you put it to far fwd it may tend to stuff, my only concern is that you will kill yourself before you get it right, go out again with a few people and move them around in the boat to see whats best, and if you do kill yourself can i have your boat

Thanks Biffer, you have a heart made of marshmallows

One good thing about Knott end slip (on the right day) is you have the calmer river to try things out and then nip into the channel to try it out on lumpy stuff. And if all goes to wrong, beach the bloody thing.

Right, just a thought. If I was to gut the deck and place console, seats etc in and a weighted box to act as fall fuel tanks then move the axle on the new trailer, I need to get, to find the rough balancing point (see-saw style) and then mess about with arranging. I should get an idea?

chewy · 27 January 2009, 19:18

Buy some more fuel pipe and put the fuel tanks in the bow. You'll be suprised how much difference it makes.

Completely different but my Longliner would ride bow up, too much throttle I know. Put some shot blast grit in the bow and it was fine.... hit the first wave and it went through it rather than over it!

Think I paid £8 for a bag of grit which weighed roughly 30kg.

Have fun,

Phill

biffer · 27 January 2009, 19:22

from your pic i'm guessing the weight need to be where you stand, if you could rig your battery and fuel either side of where you stand that should help a lot, jam the fuel between your legs as i'm assuming the battery is in the seat, take a couple of bodies with you and get them to hold on eitherside of the console, if thats to much move them either side of the seat pod and so on

JSP · 27 January 2009, 19:29

Quote:

Originally Posted by biffer

from your pic i'm guessing the weight need to be where you stand, if you could rig your battery and fuel either side of where you stand that should help a lot, jam the fuel between your legs as i'm assuming the battery is in the seat, take a couple of bodies with you and get them to hold on eitherside of the console, if thats to much move them either side of the seat pod and so on

The fuel tanks are meant to be under the console and I know 2 25l tanks are heavy. Will use some people like you and codders suggested. Just would like to get a good idea of where to have the other console tanks and battery.

The plan was to have one big fuel tank inside the new console, with a partition inside the console so no electrics could spark of a heated relationship with any fumes. And then move the double Jockey up behind the console and keep the battery in that.