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Old 19 April 2015, 12:20   #31
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Country: Canada
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Make: Highfield
Length: 5m +
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Looks great Mac! Too bad about the ice killing off the fun for the first weekend
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Old 19 April 2015, 13:06   #32
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Country: Poland
Town: WARSAW
Boat name: T1
Make: HIGHFIELD OM540DL
Length: 5m +
Engine: EVINRUDE 115 HO
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Join Date: May 2014
Posts: 542
Nice setup. Please give feedback after few days on the water.
By the way - is it HONDA CRV ? I like HONDA, but on the end have decided to install EVINRUDE on my boat.
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Old 19 April 2015, 17:09   #33
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Country: Canada
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Boat name: Miss Kimi
Make: Highfield OM 540DL
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Engine: Johnston 70 4 stroke
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Mat, here is a few more pictures of the A frame.
Yes it is a Honda CRV ,pulls the boat easy.
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Old 25 April 2015, 16:57   #34
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Country: Poland
Town: WARSAW
Boat name: T1
Make: HIGHFIELD OM540DL
Length: 5m +
Engine: EVINRUDE 115 HO
MMSI: 261026640
Join Date: May 2014
Posts: 542
Ok, my setup:



low trim, accelerate, trim up and speed is usually 50-60 km/h within seconds on lake




We tested it on 2 lakes connected by natural channel. On lakes speed was between 40 km/h till 75 km/h. Channel - 6km/h. Very quite engine, even on low speed looks like V6 engine - not any vibration at all


Still few modification awaits.
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Old 25 April 2015, 17:26   #35
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Country: UK - England
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Perfect set up
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Old 26 April 2015, 20:35   #36
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Country: Canada
Town: Willow Beach
Boat name: Miss Kimi
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Engine: Johnston 70 4 stroke
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The ice is gone!
I got the boat out today! water is still very cold 36F
Boat runs beautiful and it got up to 52 KPH today at 5000 RPM.
Went on plane instantly.
Thats not bad for a 70 HP 4 stroke.
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Old 27 April 2015, 01:44   #37
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Country: Poland
Town: WARSAW
Boat name: T1
Make: HIGHFIELD OM540DL
Length: 5m +
Engine: EVINRUDE 115 HO
MMSI: 261026640
Join Date: May 2014
Posts: 542
What WOT is recommended for your engine ? Usually it is 5500.
So you can change prop to smaller one.

It is light boat so 70 HP be enough.

My target is a month in Greece (Aegan See) and we are 5 persons family (2+3) and all family member like snorkel. So we have a lot of people and gear on the boat.
5 x (short Neoprene suits, neoprene waist, automatic waist, fins, mask, pipe, bags ...)
Plus even inflatable kayak ... And some water and dry food.

Plus we plan long daily trips like 100 km in one way. This is a reason why I select maximum possible engine. EVINRUDE 115 HO weight the same than HONDA BF 100
Plus it was good offer in Poland for this engine.

For lake and not so many people 70-80 HP is good enough - I'm pretty sure.
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Old 27 April 2015, 08:14   #38
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Yes my WOT is 5500 rpm, but I prefer not to run it that high, it is best to back down the throttle a little bit? It can not be good for an engine to run at WOT for long periods of time?
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Old 27 April 2015, 09:03   #39
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I don't know what effect throttle setting has by itself, except that the least stressful manifold pressure difference occurs at maximum throttle.

Engine wear rate increases with RPM to the power four, if I remember rightly.
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Old 27 April 2015, 11:08   #40
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Country: Poland
Town: WARSAW
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Make: HIGHFIELD OM540DL
Length: 5m +
Engine: EVINRUDE 115 HO
MMSI: 261026640
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Posts: 542
Quote:
Originally Posted by r3tmac View Post
Yes my WOT is 5500 rpm, but I prefer not to run it that high, it is best to back down the throttle a little bit? It can not be good for an engine to run at WOT for long periods of time?
To check if you have proper propeller for your boat it is good to make one test:

1. After you warm up engine
2. After 10 minutes of normal cruise speed at 4000 RPM
3. Full throttle half a minute and check RPM. If you reach 5500 or a little higher (if you be alone) - you have right propeller.

If not (below), you can consider to use prop with lower pitch (1 inch is usually 300 RPM more). Perfect fit prop is like perfect ATM for a car ...

Mine WOT with full load is 5500 RPM (300 kg of people), with me alone 5800.
I'm trying to have 4000 RPM but EVINRUDE pushes me to have 4500 even 5000 on calm water.

On long cruise will try to follow l / 100 km consumption and will try to operate between 3800 - 4500 RPM (50km/h - 60 km/h on the lake, less on the Sea I think)
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