Short Leg!!

Alistairr · 20 Aug 2003

Why does the power of the engine drop when i operate the engine trim button?
Something seems to be shorting out.

The boat is a Sealine 215 with 5.0l volvo engine and leg.

Cheers...

Alistair...

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Petrol Rules..

hlb · 20 Aug 2003

I dont know. But I seem to be having a simmilar problem with my chair!!.../forums/images/icons/laugh.gif

<hr width=100% size=1> No one can force me to come here. I'm a volunteer!!.

Haydn

Happy1 · 20 Aug 2003

/forums/images/icons/laugh.gif/forums/images/icons/laugh.gif

<hr width=100% size=1> "You only see what you recognise, and you only recognise what you know"

Alistairr · 20 Aug 2003

Now! that i CAN fix....

I 'so' want a Burgee, but have nothing to hang it from.. (can you help, Haydn?)

<hr width=100% size=1><A target="_blank" HREF=http://www.hamptonandmcmurray.co.uk>Hampton and McMurray</A>

Petrol Rules..

boatone · 20 Aug 2003

If your boat is the samew as in your profile piccie, you can get a short burgee staff which fixes to the stainless steel pulpit like mine:

<hr width=100% size=1><A target="_blank" HREF=http://www.boatsontheweb.com/> Website, Photo Gallery, Chat Room, Burgees</A>

Alistairr · 20 Aug 2003

Yes thats my boat, I have never seen a burgee staff anywhere is there somewhere online i can get it?

I would so love a Burgee with my boatname on it..

<hr width=100% size=1><A target="_blank" HREF=http://www.hamptonandmcmurray.co.uk>Hampton and McMurray</A>

Petrol Rules..

hlb · 20 Aug 2003

While your looking, see if you can find me a new horn. I've looked every where. Taa!

<hr width=100% size=1> No one can force me to come here. I'm a volunteer!!.

Haydn

Alistairr · 20 Aug 2003

What type of horn would you like??

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Petrol Rules..

Alistairr · 20 Aug 2003

BTW,
None of this is helping my 'Short Leg'!!!!

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Petrol Rules..

TwoStroke · 20 Aug 2003

Assuming you mean the leg, what sort of rpm are you trying to trim at and are you on the plane?

<hr width=100% size=1>How much to fill'er up!

Alistairr · 20 Aug 2003

Yes the boat is on the plane, and rpm is roughly 3-4000rpm, Anywhere between 1/2 and full throttle.

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Petrol Rules..

TwoStroke · 20 Aug 2003

I've noticed the same happen to mine when trimming the leg at half power. Tends to happen more when just on the plane, which sounds as if you are. I now trim leg with a bit more throttle to compensate, but as this is my first boat have assumed I'm draining power from engine (similar to air con unit in car). May be I have the same problem?

How big is the power drop as mine is just detectable?

Has it just started to happen after your recent service?

<hr width=100% size=1>How much to fill'er up!

Edited by TwoStroke on 20/08/2003 09:55 (server time).

martynwhiteley · 20 Aug 2003

Haydn,

I got a new horn from ASAP Supplies.

Its louder than I had hoped for, and not a lot of money.

<hr width=100% size=1> <A target="_blank" HREF=http://www.mboat.org>http://www.mboat.org</A>

Alistairr · 20 Aug 2003

It not happening on my boat, but on a friends boat and i said i would take it out at the weekend to see if we could fix it. It has only recently developed this problem.

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Petrol Rules..

duncan · 20 Aug 2003

the trim is driven by the battery and the comparison to the draw from a car alternator isn't really applicable here.
I suspect that you are getting less drive to water rather than less power from engine to drive.
Fastest way to a conclusion is to take out someone experienced and show them

<hr width=100% size=1>

martynwhiteley · 20 Aug 2003

Think there was a similar post to this a few weeks ago.

The conclusion was that by trimming the leg, the boat was starting to drop off the plane.

When the boat drops off the plane, the engine will suddenly meet a sharp upturn in the load, due to the vastly increased resistances/friction of semi-displacement mode.

This will have a marked effect on a petrol engine running at 1/2 to 3/4 throttle, since the power/torque curves are 'quite low' at that point, thus the engine will slow down.

Higher torques and better power spread from diesels mean they will not suffer as much.

<hr width=100% size=1> <A target="_blank" HREF=http://www.mboat.org>http://www.mboat.org</A>

Alistairr · 20 Aug 2003

Its not a case of getting less drive, It a case of when i push the trim button up or down, there is an instant drop on all the guages and the engine tone, as soon as i take my finger of the button it instantly returns to normal.

A poor example, It like driving your car at night with full beam on and the radiator fan kicks in and you can see the brightness of the lights dipping down a bit.

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Petrol Rules..

martynwhiteley · 20 Aug 2003

Begining to sound like a very loose or corroded main earth connection to the engine, or one of the other main connections.

I know when I fitted my trim/tilt pump, I took the main pos and neg feeds from the main engine terminals, so it's perhaps possible that the accessory feeds supplying all other equipment are the ones with a dodgy connection which breaks down once the trim/tilt motor draws it's amps.

Of course if the alternator's shot and the battery volts are low, the effect could be just what you experience, once a large load is applied to the system.

<hr width=100% size=1> <A target="_blank" HREF=http://www.mboat.org>http://www.mboat.org</A>

TwoStroke · 20 Aug 2003

Agree, if you are getting that much drop first item to check is batteries and then alternator. Work back from there with connections.

Do you know when the fuse connections were last checked as that was what caused my voltage drop after checking all the connections. They had quite a bit of crud on them - quick clean - back to running order.

<hr width=100% size=1>How much to fill'er up!

Alistairr · 20 Aug 2003

When you say clean the connections, you mean with wire brush??

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Petrol Rules..

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