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Old 29 April 2016, 14:59   #61
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Country: UK - Wales
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Sounds like a job for a gynaecologist Jeff. I'll practice peeling oranges in my pocket and see how I get on :-)


I tend not to have the prop bag in the boat whilst on the water but I take your point. Maybe keep the spare prop in a clear polythene bag and use that if the need ever arose. That way you can see what you're doing through the bag.
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Old 29 April 2016, 15:18   #62
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I changed one once in a decent surf never again you won't believe how hard it is to get the nut started
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Old 02 May 2016, 17:37   #63
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Quote:
Originally Posted by Fenlander View Post
Pitch is printed on the back of one prop blade.

I think the vibration is worse to some extent with the larger moving mass of the engine internals on the 20 vs the 6. As Jeff says the 25 has the offset crank starting to smooth out the mechanical imbalance... as well as the smoother power pulses of 3cyls.
Thanks for the info re the prop. And yes, I think you're right about the larger 20's extra vibration compared to the 6. But I'm still happy with my decision, as the extra power is great, the extra vibration not a real problem, and I know I wouldn't want anything any heavier than the 20.
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Old 06 May 2016, 14:10   #64
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Guys, just so you know, I sent a pdf version of the manual for the DF15A and DF20A to Will Burchall to put in the manuals section. He hasn't posted it yet, but I'm sure he will soon.


No need to soil the pages of your paper manual Fenlander.


In case you're wondering, I have ordered an 11" prop / Nut / washer /split pin but due to the water resistant grease being out of stock they haven't shipped anything yet. Doh! I'll report my findings after sea trials.


Cheers
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Old 06 May 2016, 16:13   #65
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Well done on sorting the manual for others... this is getting a popular outboard and as the warranty end nears many of us will be home servicing I assume.

Look forward to feedback on the 11" prop... hopefully testing my new 10" pitch in a couple of days.
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Old 06 May 2016, 16:41   #66
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No Problem. What would be good would be for a bunch of us owners to club together to buy a few of the special tools such a flywheel puller for the timing belt change though that may be "fabricatable" and the 26 pin test cord for diagnosing faults - not so easy to get the right connectors to make one. Expensive for personal use but as a shared resource not so much. Of course there are always ways around this but puncturing cable insulation to measure voltages isn't ideal in an outboard motor. Food for thought anyhow.

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Old 08 May 2016, 14:05   #67
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Hoping not hijacking but prop related on my 25 Suzuki on a 10/4 x 11 inch pitch I got 24 knots @ 5560 rpm flat calm no wind next time out 22 knots slight tide & wind plus 22 ltrs extra fuel same rpm given 200 rpm per inch of pitch I could go down to a 9 inch pitch to give 5960 rpm so to calculate speed do I multiply out inches of pitch x rpm to give theoretical speed?

Since I am about as good as it gets with my payload do I buy the same prop again as a spare or go up or down in pitch your thoughts.


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Old 08 May 2016, 14:34   #68
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Jeff I'm no expert but my experience has been that you can calculate all you like but it's only when you get on the water with a representative load and tach do you see what any particular prop will do. I've had different results with the same pitch in different prop makes.

So is that your motor maxed out at 5560rpm with the 11"? I'm guessing it should be a little over 6000rpm so a pitch down might suit. Gut feeling whatever the theory 9" seems a little drastic as it's the standard prop for many 15hp motors.

But are you fully run in yet?

As long as nothing come up I'm off out tomorrow to try my 10" prop which is just my gut feeling for the best pitch for us... the revs vs speed will confirm this decision... or not!
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Old 08 May 2016, 15:01   #69
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Hi David

Fully run in now and yes maxing out in all conditions that I can stand to ride in as it is it planes very nicely at 14 knots in a chop and happy with that, top speed is well more that I need at 22-24 knots and hole shot is very good with plenty of spare power my thoughts was to go up a pitch to give a better crusing rpm since I have redundant power and a choice of prop.one thing I did notice and is obvious that my weight gives some drag as I sit on the port side so I will offset the console and fuel tank to level up also at top speed the bow twitches side to side not a problem but never noticed that before on any sib might be weight related?

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Old 08 May 2016, 15:17   #70
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>>>bow twitches side to side not a problem but never noticed that before on any sib might be weight related?

If you mean the boat sort of steering itself at the bow I'd say you have a little too much weight up forward.
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