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Old 01 January 2017, 16:16   #41
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You could try doel fins as a quick fix before you get the ptt fitted, I'll probably get shot down in flames for saying it but in some circumstances they do help.
A lot cheaper than trim tabs and easily taken off if they don't suit
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Old 01 January 2017, 16:28   #42
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Shush BK. he will take you seriously!!)
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Old 01 January 2017, 16:42   #43
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Shush BK. he will take you seriously!!)
I could just screw on any old fins becuase my engines ventilation plate has already been raped. The engines from a searider 5.4.

But its not that immediate, haha so no danger
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Old 01 January 2017, 17:23   #44
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The 55 two stroke will drink far more than a 70 4 stroke and the range required is totally down to the users requirements so not realy for anyone else to say you have too much onboard. What's the saying "you only have too much fuel when your on fire"
Regardless of the ballance of the boat the power trim will transform the handling & ride so once the trims fitted then you can re-evaluate the ballance then
If required
Yes the 55 2 stroke will use more but I would of never thought it could use that much more

0.5km per litre is rediculus, my mate gets better than that with his 3.5 ton outfit with a 300hp.

I get 3.5 km per litre from my 70 and was always under the belief 4 strokes were about 30 % better on fuel.

I owned an 18ft cabin dory in the UK with a 55 evenrude which I thought was thirsty, that boat could go complety round the IOW on less than 2 x 25 lt fuel cans.

Mextli my advice is if you use your boat lots sell the engine and buy a 4 stroke with power trim, the savings in fuel will soon make the change worth while.
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Old 01 January 2017, 17:40   #45
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Yes the 55 2 stroke will use more but I would of never thought it could use that much more

0.5km per litre is rediculus, my mate gets better than that with his 3.5 ton outfit with a 300hp.

I get 3.5 km per litre from my 70 and was always under the belief 4 strokes were about 30 % better on fuel.

I owned an 18ft cabin dory in the UK with a 55 evenrude which I thought was thirsty, that boat could go complety round the IOW on less than 2 x 25 lt fuel cans.

Mextli my advice is if you use your boat lots sell the engine and buy a 4 stroke with power trim, the savings in fuel will soon make the change worth while.
I did write 0.5l per kilometre so that is roughly 1l per NM , not the other way around.

Its calculated in a very defensive way already, i managed 0.2 per km on a flat river with the engine trimmed up manually
Since the last measurement we raised the engine, now with ptt its going up another hole and then it needs a new prop, preferably a 4 blade one as the current one is too short.

Im aiming for 0.3 l per km
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Old 02 January 2017, 05:28   #46
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You know, the not-getting-on-the-plane-fast-enought COULD be remedied with a set of ... wait for it.... Trim Tabs.
nah, being a fat old bloke I can just stand up and move a bit of weight to get up on the plane a bit quicker, and anyway there's no rush now I've retired, every day's a Saturday
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Old 20 March 2017, 07:14   #47
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Hi all

just to post a conclusion,

I have now overhauled and fitted the PTT to my Searider - the boats performance has changed to the better, so Trim Tabs are off the list for now.
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Old 20 March 2017, 08:00   #48
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top job
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