Trim ??

rickyl29 · 30 March 2017, 22:34

Hi so I have bought a new 2.9 sib and a 9.9 outboard. And really want to get out on the water fishing. I keep reading about timing the engine as I am new to this I'm not really sure what this means or how I would trim the engine ???

Lee argyle · 30 March 2017, 22:58

Max... · 31 March 2017, 07:39

Quote:

Originally Posted by rickyl29

Hi so I have bought a new 2.9 sib and a 9.9 outboard. And really want to get out on the water fishing. I keep reading about timing the engine as I am new to this I'm not really sure what this means or how I would trim the engine ???

See Loco's excellent guide via the link in the post below to set up your engine:

http://www.rib.net/forum/f50/which-s...tml#post618458

Fenlander · 31 March 2017, 09:17

Both linked guides excellent but perhaps (particularly Loco's) heavy reading in the context of a newbie with a 2.9m/9.9hp combo.

Inflate boat... drop outboard on transom and clamp... set outboard trim pin to middle position... place fuel tank amidships (ideally)... spread any kit evenly... if solo sit further forward than just by the outboard (may need a tiller extension)... if you have a mate then sit nearer outboard with them nearer centre or just forward of centre.

Off you go... this should work fine in 90% of cases for your size and power of setup.

To get on the plane you may need to temp shift your weight forward until the boat is over "the hump". Then find your seating position/s where the boat runs about level. You don't want the bow right up in the air... and you don't want it pushed hard into the water either (only usually happens if crew well forward in a small SIB).

Report back anything that doesn't seem right and we'll assist.

Enjoy your first trip!

rickyl29 · 31 March 2017, 10:14

Hi thanks for all your replies. Wen you say about the out board trim position at the middle pin you mean so outboard is at a angle as i have mine at the lowest postion. I.e straight down with no angle sorry its hard to explain i am new to all this.

Fenlander · 31 March 2017, 10:32

The outboard should be straight down so the propeller shaft is parallel with the water in the normal on the plane attitude...and with the angle of most transoms the middle pin puts it about right at least for a starting position. However it is unusual that this will need the pin to be at on or other extreme. A photo of the outboard on the boat from the side would help.

So you have to imagine the boat on the water will ideally sit just a little bow up and then set the outboard angle so its propeller shaft would be parallel to the water surface.

rickyl29 · 31 March 2017, 10:36

Ok i this helps a bit i took ok it out last year only to play with it and its a 2.7 with a new selva 9.9 and as soon as i twist for some power the front just lifts straight up and stays up hahahah is the engine to big ???

Fenlander · 31 March 2017, 11:18

So are you not getting onto the plane.... not getting over the hump? Are you solo?

Got your pm... as long as the transom is rated for a 9.9 then no I don't think it's too big... plenty big enough though.

Have a look at this video...

https://www.youtube.com/watch?v=qASGeA0_PQ0

See the bow rise at 22sec as he get to the displacement/planning speed "hump". Then at 26sec he has levelled out. At 34sec he's added crew and you can see how much better balanced the outfit is.

In this video...

https://www.youtube.com/watch?v=nvjZpkpsR_U

you can see the significant bow rise despite the guy sitting well forward... but it does mostly level out when he's properly on the plane. Then again when he adds crew at 1min40sec it's much better once on the plane... still a fair bow rise getting over the hump though. Hard to know from the video but I get the impression he might have his outboard pin set so it's too far out... i.e. prop away from the transom. This would encourage bow lift.

rickyl29 · 31 March 2017, 11:44

Thanks for all your help yer i see what you mean that it levels it self out i might try the pin 1 more up see if that changes anything and no im affraid its only rated for a 6

Fenlander · 31 March 2017, 11:52

I know the Selva brand but not familiar with your 9.9... I wonder what it weighs and how that compares to the rated weight for an OB as shown on the data plate? If the OB is too heavy it will be part of your issue.

But as I asked earlier are you getting on the plane but bow high... or not getting over the hump at all?

rickyl29 · 31 March 2017, 11:56

I can get on the plane but annoying wen i want just move just a couple meters uo the beach for some fishing and all i can see is the sky wen i twist just a small amount its like the boat just wants to flip its self. The annoying thing is im in about 2k as well haha 1400£ for the selva and 500£ for the seago 90£ for the acces to the beach. Maybe ill sell the engine and buy a 6hp

Fenlander · 31 March 2017, 12:07

Or upgrade to a longer SIB which shouldn't suffer bow rise to the same degree?? Get something like a 3.2m Honwave, set some fuel tank fixings in the bow and buy a tiller extension.

Re downsizing the outboard if that's your choice... if you are fishing just off the beach in waters without any great tidal flow the lightest weight 4-6hp motor would be fine.

rickyl29 · 31 March 2017, 13:04

I think maybe ill the tiller extension that way i can sit futher uo the boat and maybe move the pin up 1 see if that helps if not looks like buying a bigger boat more expense again haha

rickyl29 · 31 March 2017, 14:44

I have now bought another boat rated 10hp

Fenlander · 31 March 2017, 17:40

That was quick!

rickyl29 · 31 March 2017, 18:16

Sunmer is coming my old man had 1 so got that 1 now it says max 10hp so should do the job

Fenlander · 31 March 2017, 20:44

Sounds good... a freebie always is. What length is the new one?