Home | Classifieds | History | Technical | Links | Store | About Us | Email
Topics Topics Edit Profile Profile Help/Instructions Help Member List Register  
Search Last 1|3|7 Days Search Search Tree View Tree View  

Mianus installation in dory

Old Marine Engine » Boats with Early Inboards » Mianus installation in dory « Previous Next »

Author Message
Top of pagePrevious messageNext messageBottom of page Link to this message

walt_ansel
New member
Username: walt_ansel

Post Number: 2
Registered: 12-2011
Posted on Sunday, January 08, 2012 - 10:12 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Here are pictures of patterning for a skeg/shaft log and beds for installing Ansel's 3 hp Mianus in an 18' dory

engine photo 1

skeg and rudder pattern

dory looking aft

dory stern

Profile drawing

Forward view
Top of pagePrevious messageNext messageBottom of page Link to this message

jb_castagnos
Senior Member
Username: jb_castagnos

Post Number: 644
Registered: 07-2002


Posted on Monday, January 09, 2012 - 09:54 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

I'd go ahead with it. Is this a new installation or a repair?
Top of pagePrevious messageNext messageBottom of page Link to this message

walt_ansel
New member
Username: walt_ansel

Post Number: 3
Registered: 12-2011
Posted on Tuesday, January 10, 2012 - 08:54 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Hi JB,
Its a new installation. The dory had an outboard well that my dad removed. Thats what the square hole is from in the last picture-I've got to plug this with 1" pine.
Could I use a dry exhaust vented underwater? I was going to cool the engine with fresh water in a copper pipe keel cooler.
Thank you - Walt
Top of pagePrevious messageNext messageBottom of page Link to this message

solarrog
Senior Member
Username: solarrog

Post Number: 510
Registered: 03-2002


Posted on Tuesday, January 10, 2012 - 09:57 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Hi Walt
You have peaked my interest. What type of outboard was on this boat?
I collect very early outboards
Roger
Top of pagePrevious messageNext messageBottom of page Link to this message

jb_castagnos
Senior Member
Username: jb_castagnos

Post Number: 645
Registered: 07-2002


Posted on Wednesday, January 11, 2012 - 06:27 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Dry exhaust gets very hot, venting under water will have back pressure possibly making it hard to start. Outboards have a vent above water to relieve pressure when sarting, water exits with this to quiet it while running. We had an outboard at my dad's shop when I was young, Tuned it up, ran fine. Wouldn't start when launched, bees had plugged the vent. I would consider a second pump driven from the prop shaft for exhaust cooling water. A piston pump would pump forward and reverse, a gear pump can be plumbed with four check valves to pump the same direction with either rotation, do you plan to reverse the motor?
Top of pagePrevious messageNext messageBottom of page Link to this message

jb_castagnos
Senior Member
Username: jb_castagnos

Post Number: 646
Registered: 07-2002


Posted on Wednesday, January 11, 2012 - 06:33 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

These engines shake quite a bit, looking at your engine support I would make then longer and notch and fit them around the ribs, bed them in with a filler, maybe epoxy.
Top of pagePrevious messageNext messageBottom of page Link to this message

kerrigan
Advanced Member
Username: kerrigan

Post Number: 41
Registered: 06-2008


Posted on Wednesday, January 11, 2012 - 06:38 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

How do you plan to mount the rudder? There are many ideas on http://www.google.com/search?q=rudder+post&hl=en&sa=G&prmd=imvns&tbm=isch&tbo=u& source=univ&ei=1xc

I have surplus rudder components from a dismantled 26' sailboat with a 1.25" diameter rudder shaft. Depending on your design you may find some parts useful.
Top of pagePrevious messageNext messageBottom of page Link to this message

walt_ansel
Member
Username: walt_ansel

Post Number: 4
Registered: 12-2011
Posted on Wednesday, January 11, 2012 - 10:27 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Hi Folks,
This dory is only about four years old. The linseed oil finish makes it look a lot older. My dad cut a scale model, then cut 5 station molds thru the model. He then traced the sections, scaled up and built full sized molds. He's an experienced boatbuilder, now retired.
The outboard was a Forty Plus Seagull. You could not tilt it up in the well and this was less than ideal.
The first photo of the engine in the boat shows a mahogany glued up pattern below the Schebler. This for the engine beds that I'm going to make out of 3" oak. They will notch over the frames and be well bolted.
The rudder is a copy of a Toppan power dory rudder at the Seaport. I have a 3/4" monel shaft for a post and the bronze strap in the photo to hold a bottom bearing. The blade will be wood, cross bolted to the post.
Thank you for your help and interest- Walt
Top of pagePrevious messageNext messageBottom of page Link to this message

miro
Senior Member
Username: miro

Post Number: 590
Registered: 11-2001


Posted on Friday, January 13, 2012 - 10:31 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

I suggest that you make the engine bed as big and beefy as you can.
Notching the engine bed lumber to account for the ribs and fastening it very strongly to the hull is important. And, for sure, you've got to use some kind of bedding compound eg Sikaflex
Epoxy might be a bit brittle
On your boat it might take some fussing and fitting to get the bed lumber tight - but the effort will be well worth it.
On these videos you can see the engine beds are big and beefy.

http://www.youtube.com/watch?v=XNG9gI_6b7s&feature=related

http://www.youtube.com/watch?v=7Iirpza4iqc

See if you can figure out some way of getting water into the exhaust ( as per JB's suggestion)- preferably as close to the engine as you can. Again, it's worth the effort.
I think you'll also find that the engine will run cool - that's OK for a while, but after a number of years of running, an overly cooled engine will have a lot of carbon gunk built up inside .
A small control valve on the cooling water will help you keep regulate the engine temperature.
Miro
Top of pagePrevious messageNext messageBottom of page Link to this message

walt_ansel
Member
Username: walt_ansel

Post Number: 5
Registered: 12-2011
Posted on Sunday, January 15, 2012 - 06:59 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Hi Miro,
Thank you for the advice-the videos are fantastic!
I milled a bunch of 7/4 and 8/4 angelique (South American hardwood) yesterday for beds, floors and shaft log. I had this left over from rebuilding an 1880's oyster dredger about 14 years ago.
I made a split shaft log with splines on the table saw which I think I'll glue together with epoxy. Its a 1 1/4" hole for a 1" shaft. Tricky drilling ahead! Walt

Add Your Message Here
Post:
Bold text Italics Underline Create a hyperlink Insert a clipart image

Username: Posting Information:
This is a public posting area. Enter your username and password if you have an account. Otherwise, enter your full name as your username and leave the password blank. Your e-mail address is optional.
Password:
E-mail:
Options: Automatically activate URLs in message
Action:

Administration Administration Log Out Log Out   Previous Page Previous Page Next Page Next Page

Home | Classifieds | History | Technical | Links | Store | About Us | Email
&copy 2005 OldMarineEngine.com, P.O. Box 188, Forest Dale, VT 05745-0188 • Phone: 802-247-4864 • All rights reserved.
   Marine Engine Seloc Repair Manual Lookup Tool

marine gas engine repair and restoration