Best CP-16 Outboard Motor for the Money ?

[Solid_Tude]

So the sails on a CP-16 make about 2-1/2+ hp?


skip.

I'd say the sails make a bit more hp than my 2.5 hp Tohatsu.  With a decent breeze and my custom made Sailcare fully battened main and the 130 genny fully unfurled, I've had it over 5.9 knots on flat seas several times and even have pegged it over 6 knots for a few moments.  And this was not surfing down waves either.  Best continuous speed in a decent steady breeze so far has been 5.7 knots observed via GPS.  So, I'd guess that the sails I have are making somewhere between 2.95 hp and 3 hp if I did the math right.  Hull speed is 5.0116 knots based on the 14 foot waterline, so getting more than that must be a function of a heeled boat affecting Waterline Length and Wetted Surface Coefficient in the mix.   Note, I do have the IDA foiled rudder too, which probably is a contributing factor as well reducing some side slippage and giving me better bite and speed.  At least that's my guess, but I may be wrong about this.

[kickingbug1]

  we have had our 16 to 6 knots (also gps) at about 15 degrees of heel. that is with the stock jib and a new (stock dimension) main and ida rudder. i think that is all the faster a 16 can do. our 130 jib (original and worn out) just makes her heel more on a reach. the 2.7 horse outboard makes about 3.5 knots but i havent opened it up (its a 69 motor)

[Shawn]

Some of those goodyear engines are pretty cool looking. It would likely be fun getting it up and running again, it probably wouldn't take much.

Shawn

[nies]

FYI............the theoretical hull speed of a displacement hull is 1.34 x sq. root of LWL=knots x 1.15 for mph............the compac 16 is 1.34 x sq. root of 14=5.01382 knots or x 1.15=5.77 mph............on my 1978 compac 16 ,which I purchased new, I have had  various sized motors and  have found the Merc. 5HP regular shaft to work the best of all, when in a storm with waves/current/wind the extra power is great to have the extra horses...............having said that ,I have under ideal conditions experienced some hull lift  and got 6.14(GPS) mph........nies

[Bob23]

Hey Nies: 
   Are you the same Nies who was here about 1 1/2 years ago? If so, welcome back! If not, welcome!
Bob23

[nies]

Yes, the same old nies, decided I could not live without you guys........................nies

[Pete H]

Hi guys,

I chose to equip my new Legacy (which seems to me to be pretty much the same as a 16), with a 6 hp four stroke Evinrude, for exactly the reasons explained by Nies. Whether this is the best value for money is a different thing, the prices you guys have been talking about make me drool with envy. The Evinrude cost $1860 Australian dollars. The A$ is currently worth about 1.05 American dollars. So at about $1950 US for this outboard, it isn't the cheapest outboard available here, but is not as expensive as a Mercury.

Part of the problem of a small population according to those who don't know (politicians).

Regards,

Pete H

[jcatkeson]

$200 diffeerence between two water cooled models. Makes on wonder what the shortcut might be.
conner

[itsmark]

My 1987 Suzuki 2 HP, 2 cycle pushed my CP-16 across Pensacola Bay last May at 3-3.3 knots, 19 Nautical MPG.  I had very limited fuel and no wind...  It's plenty power if you want to go near hull speed.  I've had a 40 HP, 4 HP and 2 HP Suzuki - loved them all.  The 2 HP 2 cycle is very light.

[federalist]

I have an old Evinrude 4 hp 2 cylinder which does just fine.  I was wondering if anyone has used a British Seagull with a CP16? http://www.britishseagull.co.uk/

[Pete H]

Hi Guys,

I haven't used a Seagull with a CP 16, but I did use a Silver Century Plus to push an 18 foot Hartley for many years. It was supremely reliable, had plenty of power, at times it pushed the  Hartly into 40 knot head winds. This was the biggest Seagull made at the time and was fitted with a huge prop. In many ways an ideal motor for the job. BUT, and there is always a but in life isn't there.  This motor had a clutch(very handy) BUT no reverse and couldn't be rotated 360 degrees, which made some manoevres difficult, couldn't use reverse to slow down when approaching a jetty etc.  The other BIG problem for me was the inbuilt fuel tank, too small, always ran out at the most inconvenient times and was difficult to refill at sea in rough conditions, precisely when you needed the motor the most.

So if the question is will a Seagull push a CP 16, the answer is the largest ones will, the tiny little ones, I don't know about.

Would I recommend one for use nowadays, no. Too many other great options available.

I replaced the Seagull with a 9.9 HP Johnson, with FNR and remote fuel tank. I found this much easier to use and much more convenient, on my current Legacy I have an Evinrude 6HP, which has all the same advantages.

Seagull parts :- if you are thinking of using a Seagull, there is a guy in England who has spares  for sale and is the " official" dealer, just google Seagull Spares and you should find him.

I still have my old Seagull, hanging on the wall of the shed, it is an example of simple, minimalist design and engineering, meant for one purpose only, (pushing heavy displacement hulls, day in day out for ever). I start it up occasionally, every few years or so, prime it, pull it over once, then it ALWAYS starts on the second pull, (it always starts on the first pull when it has been running recently). Seagulls; you gotta luv em, but that nostalgia doesn't mean you have to use them. It's a bit like refusing to use a smart phone and insisting that engineering hasn't moved on since the wall mounted dial phone.

Regards,
Pete H

[itsmark]

My 1987 2HP Suzuki 2-cycle, long shaft pushed my CP16 across Pensacola Bay last May getting 18.8 NM/gallon at 3 - 3.3 knots.  I had a long ways to go with very little extra fuel.  Open the throttle and it easily gets max. hull speed.  On such a small boat, light weight is the key, if you want it to sail well.

[skip1930]

A one blade prop is the most efficient but it can't be balanced.
A two blade prop is fine but two blades need a greater diameter.
A three blade prop is the best choice. Best pitch, small diameter.
All props are a compromise.
A prop with four blades has a problem simply because the fourth blade on the hub gets in the way of the three other blades. That disrupts the water's flow.

Secondly, is a question of vibration. A three blade at 1000 rpm? well that's 3,000 impulses a minute if near a skeg or discharging toward a rudder.
A four blade at 1000 rpm? well that's 4,000 bangs a minute. Ouch!

Now what is going to change here between three and four blades is the pitch, or pitch and diameter. Both props will 'absorb' the same hp and push the same lb of water at two different rpm and two different slips through the water.

skip.