twin for a mahogany boat

[JAndrew]

Wow! That's a beautiful hull! The chines look perfectly sharp! What's the length and width of that hull?

I was a boatbuilder for a year after the Navy. All fiberglass crap with big stereos though. Nothing as classy as that.

Brilliant work! Please keep posting your progress.

-J.Andrew

 

[johnlaudano]

the boat is approx. 61" long and 18 1/2 wide.

 

[necchiom]

"Un opera d'arte!". Awesome! With compliment John. Mose'

 

[johnlaudano]

thank you for the compliment. my Dad gets the credit for the woodwork.

 

[Aerofourcycle]

Impressive wood work.

 

[johnlaudano]

here's my engine running. I can't seem to uplad the video directly to this forum. anybody know why that may be?

[ame="http://www.youtube.com/watch?v=wmubybcTVVI"]http://www.youtube.com/watch?v=wmubybcTVVI[/ame]

 

[ozzie46]

SWEET! that sounds real nice and looks great too.

Ron

 

[dnalot]

I am a professional boat builder and I gotta tell you the lines of your hull are superb. I would anodise the aluminum parts of the engine.

Mark T

 

[kuhncw]

Congratulations on a fine running, strong sounding engine, John. That was certainly a smooth first start.

Maybe I missed it, but what is the bore and stroke?

Regards,

Chuck

 

[johnlaudano]

Thanks all.

Chuck the bore X Stroke is 34mm X 27mm yielding 49cc displacement. It has a 360 degree crank with a fixed 10 degee BTDC timing advance.

The boat is nearly complete but needs many coats of finish. Should be ready for march or april.

John

 

[necchiom]

Please keep all of us updated! Moshe

 

[OrangeAlpine]

Beautiful outfit! Something to be very proud of.

However, I think that maybe the engine could use more timing advance. I have never made a miniature engine, so this may not be relevant and I do not know your intended rpm operation range. A full sized engine can run very nicely at 800 rpm and 12-15 degrees advance. It increase with rpm until reaching about 3,000 when it levels off at about 30-35 degrees.

Bill

 

[johnlaudano]

Thought some of you might be interested in my boat's progress.
a few pictures are attached.
John

 

[Aerofourcycle]

Looks great! I look forward to the lake test video.

 

[johnlaudano]

this is a video of the boat under power. unfortunately the twin engine in the beginning of this thread proved problematic due to inadequate cylinder liners. I replaced it with an OS FS 1.20 which I converted to ignition. it's air-cooled by a small fan and works well although it's somewhat small for the job.
the second video is of a YS 1.20 which I converted to water-cooled. perhaps good for a future power boat.

[ame]https://www.youtube.com/watch?v=aaNAZsa6Zc8[/ame]

[ame]https://www.youtube.com/watch?v=xH_pFtHbt9s[/ame]

 

[Herbiev]

A really great build. Thanks for the update.

 

[kuhncw]

John, what sort of problem happened with the cylinder liners in your twin cylinder?

Your boat turned out very nice. Thanks for the video.

Chuck

 

[johnlaudano]

Chuck,
my lathe is old and not accurate so the liners i made had flaws in their bores that caused the rings not to seat well enough. it ran well for the first half dozen runs or so but the ring-to-bore fit deteriorated and compression couldn't be maintained.

 

[kuhncw]

I'm sorry to hear that John. Do you plan to make new liners and get the engine running again for your boat?

Chuck

 

[johnlaudano]

no, i'm thinking i'd rather build a new engine for a new boat. it was a good learning experience.