| Author |
Message |
    
Jim Faulker
| | Posted on Sunday, December 23, 2001 - 11:33 am: | 
|
Hi
I am building an Boston Dory and installing a 4 hp make and break engine (Atlantic). The boat wil be 20' feet long. I am lost on the size of the propellor I should be using. Any ideas?
Jim Faulker
[email protected] |
Bruce Hall
| | Posted on Sunday, December 23, 2001 - 03:50 pm: |
|
Jim: Try Woodenboatshop.com or type "sizing propellers" into Google. There are a myriad of sites; some with calculators.By the way; check out George Boleys "North American Three Cylinder Club." Launch cruise events planned for Saranac Lake region of New York's Adirondack Mountains ( 6/02); Southern Quebec lakes(9/02) ; Otter River (VT.)and southern Lake Champlain(8/02); more coming.Midwinter newsletter out soon. |
andrew
| | Posted on Sunday, December 23, 2001 - 06:54 pm: |
|
Does anyone have access to the Atlantic catalog/operating instructions. I am out of town and don't have it. They include recommended propeller size for the various Atlantic engines as installed in a typical boat. A 20' dory would have been about right for the 4HP.
Most dory propellers were two bladed instead of three so that they could.
1) Fit up into the hull if fitted with a retractable propeller shaft with a universal joint.
2) Or if not fitted with a retractible shaft, then at least shut down with the propeller blades horizontal so the boat could be beached without the blades extending below the keel.
If no one else supplies the propeller size... I can post it for you in about a week.
What plans are you using for the boat? John Gardner has an extensive chapter in his book MORE BUILDING CLASSIC SMALL CRAFT (the title may be different in the current edition).
Below are some pics from an Emmons catalog.
Regards,
Andrew
 |
Joe
| | Posted on Sunday, December 23, 2001 - 09:47 pm: |
|
I have the Atlantic catalog and operating instructions in front of me and it doesn't mention prop size at all. It does have two bladed and three bladed props in their catalog....no mention of pitch or diameter. In other info I have....Easthope catalog, it mentions for a 4-6 hp the prop diameter is 14 or 16 inch. I heard a rule of thumb that suggests that the diameter of the flywheel closely approximates the diameter of the prop for that engine. I looked at the different engine sizes and the rule seems to hold true. It never seems to mention pitch at all. I have always pitched my props to get the maximum rpm as specified by the engine.....this is usually around 500rpm for the engines talked about here. One thing about bronze props...u can get away with significant pitch changes if it comes to trial and error. Following is the phone for Lunenburg Foundry and Engineering in Nova Scotia where the Atlantic comes from.
Tel; 902-634-8827
fax; 902-634-8886
Box 1240, 53 Falkland St., Lunenburg, Nova Scotia
B0J 2CO CANADA |
Jack Zwart
| | Posted on Friday, December 28, 2001 - 08:51 pm: |
|
Hi
I have just begun to take apart an Atlantic engine that I was given as a Christmas present and I in have the prop and driveshaft with it. Now I do not know what Hp engine this is but the prop is two bladed and about 18" in dia with a very deep pitch. Let me know if you want me to get more accurate measurements and I will go out in the Cold shed and get what I can for you.
Jack Zwart |
josie
| | Posted on Tuesday, January 01, 2002 - 08:25 pm: |
|
Jim, I have a 1912 20' Cape Cod Power Dory with a U2 5 HP Palmer and it swings a 16X16 three blade screw.
John Lamb |
Ernie
| | Posted on Wednesday, January 02, 2002 - 06:36 pm: |
|
An old "rule of thumb" for sizing slow turning "BIG torque" props
I can't remember all the places I have seen the following.
Prop should be square, meaning the pitch and dia have the same size. Example 16 x 16.
For a 2 bladed prop use the outside dia of the flywheel.
Example flywheel dia 16 in you would want a 16 x 16 prop.
For a 3 blade prop use the inside dia of the flywheel rim. Lets guess the ID of the above flywheel rim to be 13 in. In this case use a 13 x 13 prop.
Hope this helps
Ernie |
andrew
| | Posted on Wednesday, January 02, 2002 - 06:38 pm: |
|
Jim,
I finally found a copy of some Atlantic specs that include the propeller size.
Quote:4 HP Single Cylinder engine
Prop shaft diameter: 7/8"
2 bladed prop: 17 x 17
3 bladed prop: 14 x 16
Regards,
Andrew |
Ira Dorey
| | Posted on Tuesday, September 03, 2002 - 10:47 am: |
|
Hi,
I have a 5hp Acadia in my 20' motorboat.
There is a crack at the back of the water jacket and water seeps out when she's running, not a lot, just enough to put off a little steam.
Is it safe to run the engine like this, it still runs perfect and gets lots of water.
Also, can I get the crack welded?
Hoping to hear from you soon.
Ira Dorey
Little Burnt Bay, NF |
kprice56
| | Posted on Wednesday, May 26, 2004 - 10:50 am: |
|
Ira,
I have 3hp Atlantic in a 19 foot Newfoundland motor boat, which at onetime had a leaky water jacket in the exhaust manifold. Like yours, the engine got lots of water and I ran it for 10 years that way without any problems. Last year, I found another (good) manifold, so even though the engine doesn't care, the steaming has stopped, ha! ha!
Kevin Price
St. John's, NL
Email: [email protected] |
Robert
| | Posted on Wednesday, May 26, 2004 - 12:40 pm: |
|
Here's some info from an late Atlantic brochure:
 |
michael r. gagliardi
New member
Username: slapshot2
Post Number: 1
Registered: 11-2006
| | Posted on Monday, December 04, 2006 - 01:19 pm: |
|
I want to purchase some reproduction or rebuilt wooden buzz boxes for single cylinder St Lawrence engines.
Any ideas where they can be found? |
Doug Kimball
Advanced Member
Username: doug11k
Post Number: 32
Registered: 12-2003
| | Posted on Monday, December 04, 2006 - 09:17 pm: |
|
Michael,
Try this site:
http://www.macsautoparts.com/tt.html
They are listed in Ford Model T section |
Robert
Senior Member
Username: robert
Post Number: 147
Registered: 07-2003
| | Posted on Wednesday, December 06, 2006 - 12:38 am: |
|
eBay |
TERRY BYRNE
New member
Username: putter
Post Number: 1
Registered: 09-2006
| | Posted on Wednesday, January 10, 2007 - 08:51 am: |
|
I Am Looking For Ignitors For A 4 hp Atlantic (Make And Break).Can Anyone Help? |
Terry Byrne
New member
Username: trapskiff
Post Number: 1
Registered: 09-2008
| | Posted on Friday, September 05, 2008 - 02:42 am: |
|
Would Like To Know About Rebuilding/Replacing Babbit Bearings In A 4hp Atlantic Engine? Thanks. |
Alan Mosher
New member
Username: alanm
Post Number: 1
Registered: 08-2008
| | Posted on Saturday, November 01, 2008 - 01:24 pm: |
|
I have a 4 hp atlantic in 15 ft sailboat. I bought it last year and it ran fine. This year I cannot stop it from backfiring. I'm using non detergent oil at 40 to one. Does anyone know what the settings should be for the fuel and air? |
grant strong
Member
Username: grant_s
Post Number: 10
Registered: 06-2007
| | Posted on Saturday, November 01, 2008 - 02:56 pm: |
|
start by mixing your gas 50 to one with a 10w30 oil, clean up your points and set them. next thing would be to start up the engine tune your fule and air by ear till the engine sounds like she has reached top RPM's. |
corydory
Visitor
| | Posted on Friday, April 17, 2009 - 01:27 pm: |
|
I've got a 4 hp acadian make and break and was wondering what type of hard grease i should use in the cap. can you still get the old fashioned hard grease or is there a new type i could use. can't wait to fire the bad boy up!!get in touch with me soon please! |
Ernie
Senior Member
Username: ernie
Post Number: 954
Registered: 01-2002
| | Posted on Friday, April 17, 2009 - 06:29 pm: |
|
Just use wheel bearing grease
I got some of the old hard gease to use in my 3 hp Gray in a 20 ft launch. Eventually I had to take the engine apart to clean it out of the grease passages. Wheel bearing grease is messy but it hasn't been a problem |
Mike Hancock
Visitor
| | Posted on Thursday, May 14, 2009 - 10:57 am: |
|
I just got what I think is a 3hp Make & Break engine.
It has NOVO on it and Manufactured by The Niagara Brand Spray Co. LTd, Burlington, Ont.
Also "The S AYED" - can't make it all out. There are some numbers 9622 82 - Revs 525
I am looking for a drawing of this engine and more on how they work. Thanks for any help. - Mike |
Eldred Mesher
New member
Username: shrike
Post Number: 2
Registered: 08-2012
| | Posted on Sunday, September 09, 2012 - 06:24 pm: |
|
I would like to see a photo of the 3 hp Atlantic propellers. Also a photo of the battery switch. Thanks in advance. |
