Lightweight outboard

[Stumble]

I currently am using a Nissan 4 stroke 3.5 hp engine to power my sailboat. The engine works great, but at 40lbs it is a struggle to get it off the transom and downstairs while racing. I have been thinking of getting a http://www.smalloutboardmotor.com/20hpoutboard.html just for getting in and out of the harbor, but I know nothing about these engines and would love some feedback if anyone has some first hand experience.


The boat - Olson 30
Weight 3600
Crew another 1500
The current engine at 25% throttle will push the boat at 6kn


I also would appreciate any other recomendations for <20 lbs outboards out there.

[Rangerspeedboat]

Thats just a weed eater with some modifications. Look at this thread for some interesting ideas.

http://www.boatdesign.net/forums/diy-marinizing/weed-eater-engine-conversion-1681.html

It would not be that hard to make your own little outboard like that.

Do you really want to hear a weed eater/chainsaw until you get out of the harbor?

[thudpucker]

Some kid on a local lake has one of those Weedeaters in a 'mud boat drive' configueration.
Awful racket. The worst part was watching this kid go by foooorrrrrrreeevvveeerrrr and he was in a skiff about 10-12' long.
He was making all of 3 Mph.

[Stumble]

Well from my slip to the open water is about 1/4 of a mile. I would sail it, but harbor restrictions preclude that which is why I am looking for some other solution.

[mydauphin]

Nissan made a great little 2 stroke 2-3hp, 20hp you can't get lighter than that. It had a built in gas tank.

[Rangerspeedboat]

The smallest,lightest outboard that I have ever seen/used is my Cruise and Carry 2.7 HP. It's not that fast, but its very light, you can pick up with 1 hand. They even built a little back pack for it. Its a small air cooled 2 stroke, with F-N clutch.

I dont think they make them any more, but every once and a while you see them on eBay.

Here is what I'm talking about- http://smalloutboards.com/cc27.htm Its already sold though.

Some people say that they are loud, well not near as loud and annoying as a weed eater. All I can say is that they are very reliable, once you get it tuned right it willl start on the first pull every time. Mine does.

[tom28571]

Hi Stumble, Since you are racing your Olson 30 (what else would you do with an Olson 30?), you must have some strong guys on the rail. Let one of them do the heavy lifting. At that, 40# is not very heavy and the little Nissan is a far better motor than the one you are looking at. Such an engine is, as already said, very noisy. The oil mix ratio also says it is not very clean. When I had a small air cooled engine on a sailboat, I did not like it very much but had to admit that it was very reliable unless I tried to run it a top speed for very long. In that case, it would overheat, seize up and stop.

If you calculate what the penalty is for having 40# on the transom, you may think about just leaving it there while racing. Lots of people do that and don't think twice about it.

[Frosty]

I don't think outboard manufacturers purposely make heavy engines infact the opposite is true spending fortunes on competing with competition for a light weight motor.

By "down stairs " your mean below? So why do you have to walk 1/4 of a mile with it??????

I dont understand why you just dont leave it where it is.

[Stumble]

Frosty,

The EPA changed the regulations on outboard motors a few years ago forcing manufacturers to stop selling 2 stroke outboards in the US. This forced them to move to 4 strokes which are about double the weight of a 2 stroke for the same horse power but does allow for a cleaning burning engine (I guess).

I don't have to walk the engine a 1/4 mile, I only have to motor about a 1/4 mile to get to open water and put up the sails. The problem is that removing it from the transom to put it below is a pain in the a$$ due to it's weight. So a lighter engine would make this a easier take.

As for why not leaving it in place... Well the boat weights 3600lbs. So a 40 lbs engine comes in at about 1% of the total empty boat weight. Then it is placed as far aft as possible making the boat stern heavy... Then most likely the shaft and prop will get drug through the water at some point. All of which slow the boat down. Not a huge amount when cruising, or day sailing. But while racing, where every second counts it matters.

[Rangerspeedboat]

Well at 17 lbs, a Cruise and Carry outboard sounds just right for you. I dont know of any light weight 4 strokes, that you can buy off the shelf.

[tom28571]

Frosty,

The EPA changed the regulations on outboard motors a few years ago forcing manufacturers to stop selling 2 stroke outboards in the US. This forced them to move to 4 strokes which are about double the weight of a 2 stroke for the same horse power but does allow for a cleaning burning engine (I guess).


No 2 strokes for sale in the US? Guess I've been asleep. When did this happen?

[Frosty]

What about lifting with a halyard and lower it down the hole?

Or use the boom!!

[Stumble]

Frosty,

that is what we have been doing, but it is still cumbersom and a pain compared to having a lightweight engine to start with.

[nimblemotors]

I built an electric outboard for my 26ft sailboat. It is very light compared to the 8hp outboard, because the weight is mostly in the batteries to run it, not the motor itself. It was actually a lot more work than I thought to do the conversion, but it sounds like this is what you need if you want lightweight.

Have you looked at the big trolling motors? If 2hp is all you need, they will do.

[masalai]

I am not sure if you would consider going in this direction but anyway, have a look at Torqeedo electric outboards the 4.0R uses 48V and is fairly powerful for "hull speed applications (I an using 2 to push my Bob Oram 39C sailing cat when needed and the 4.0R weigh in at 16.5kg... There are other models offering the equivalent of 2 hp and 6 hp using 24v battery power (reverse thrust is not stunning as the propellor is optimised for forward thrust/efficiency)...

[PAR]

All up, the Toreedo motors weigh as much as a well designed gas engine. The 4.0 OR is just about as heavy as what he has, so where's the advantage? They also cost more then equaling HP in gas, so again, no gain, except in noise and pollution.

Your best bet would be ordering a 2 stroke from out of country, like Mexico. A 3 HP 2 stroke will weigh about half of your current 4 stroke.

Another option would be to remove the fuel tank, making it a remote tank setup. This will likely remove about 10 pounds from your current engine. You'd unplug the fuel line, then snatch the engine off the transom. Of course this will require some fabrication, a fuel line port, remote tank, primer bulb, etc., but could be an option too.

[masalai]

PAR, 16.5 kg for a 10hp outboard? 36.4pounds? - - The travel 801 S including battery (fuel) = 11.6 kg for 2 hp (25.6pounds) - Oh well horses for courses...

[PAR]

Masalai, I guess those batteries are made of air, right? The wimpy group 24's will weigh 40 pounds each, but since you only need 4 of them . . .

[masalai]

I don't know for sure as I only observed at the boat show last 21May at Surfers Paradise, Qld - Ni-something of a kilo or so by the looks catalogue is here http://www.torqeedoaustralia.com/Torqeedo_Australia/Reading.html or http://www.torqeedo.com/en/hn/home.html - - - I only research the 4.0R (at 4000watts, their biggest at the moment)

[ondarvr]

You can lose about 14 lbs of that 40 by getting a Merc, Tohatsu, Nissan (all the same) 3.5 or 3.3HP depending on the brand. They don't make them any more, but there are still lots of them around.

2 strokes aren't illegal, some lakes and locations don't allow older carbed 2 strokes, but they do allow newer FI and DI 2 strokes. That type of technology is just too costly for very small engines right now though.