Backing - SailNet Community
 
LinkBack Thread Tools
post #1 of 6 Old 02-28-2009 Thread Starter
Hinterhoeller HR28
 
pvanv1's Avatar
 
Join Date: Nov 2007
Location: Hamburg and Wilson NY
Posts: 156
Thanks: 9
Thanked 0 Times in 0 Posts
Rep Power: 8
 
Lightbulb Backing

I have noticed that most small outboards don't back up well. Especially the through-hub-exhaust models (typically over 3.5 hp). What happens is that the exhaust washes over the prop blades in reverse, and the prop can't bite much water.

That has been addressed with modern High Thrust props on selected new outboards, but I was having trouble getting one to fit an old Merc 7.5. Couldn't find a listing on any prop selection charts to get the HT prop. It looked like the only option was going to be for me to bore out the leg of the outboard to relieve the exhaust just above the ventilation plate.

Every way I tried to get a solution, I was stopped "dead in the water". Then, I contacted Solas, and got the answer.

I traded emails and a phone call with Marc Feinman, the US marketing rep for Solas Science and Engineering. He came up with the correct Solas part number (1113-100-07) which is a 4-blade, high-thrust, 7-pitch prop to fit the old 8-spline prop shaft on the Merc 7.5 OB. No special hub sleeve needed. Retail is about $92.00 US. Our store can source it through Coast Distributors.

Marc is a great guy, very knowledgeable and quite helpful. I can't say enough about how he handled my customer service request. He's in their Tampa, Florida office. Bottom line is that he knows the applications very well. The prop selector charts didn't help me much. Most OB and prop manufacturers concentrate on the faster, bigger and newer motors, and go-fast boats. They tend to ignore sail applications. The correct part is in fact available for most small OB's -- IF you get Marc to help find it.

I know from experience that these props are excellent for sailboats -- I have one on a Nissan 9.8 on my boat. I was actually able to downsize from 15 hp to 9.8 hp, and still get better thrust, especially in reverse. Anyone who wants to improve the low-speed thrust on their outboard-aux sailboat may want to investigate these high-thrust Solas props.

Paul Van Voorhees
Certified Tohatsu TLDI Technician
Mgr, Obersheimer Sails
Buffalo, NY USA
pvanv1 is offline  
Quote Quick Reply Share with Facebook
Sponsored Links
Advertisement
 
post #2 of 6 Old 02-28-2009
Senior Member
 
Join Date: Aug 2007
Location: NY
Posts: 2,247
Thanks: 1
Thanked 1 Time in 1 Post
Rep Power: 8
 
I thrust in reverse with a good shove with the paddle on the dock. Then I fire it up and go.
sck5 is offline  
Quote Quick Reply Share with Facebook
post #3 of 6 Old 02-28-2009 Thread Starter
Hinterhoeller HR28
 
pvanv1's Avatar
 
Join Date: Nov 2007
Location: Hamburg and Wilson NY
Posts: 156
Thanks: 9
Thanked 0 Times in 0 Posts
Rep Power: 8
 
Quote:
Originally Posted by sck5 View Post
I thrust in reverse with a good shove with the paddle on the dock. Then I fire it up and go.
Good way to go, if you have a vessel where that works. On heavier boats, where it's a toss up between lazarette-located OB and inboard power, if you have the one with OB (as I and a few of my friends do), the paddle system isn't all that effective. Also doesn't address setting an anchor in reverse. I suppose it's also OK to set the anchor from astern, and then transfer the rode to a bow chock in that case...

Paul Van Voorhees
Certified Tohatsu TLDI Technician
Mgr, Obersheimer Sails
Buffalo, NY USA
pvanv1 is offline  
Quote Quick Reply Share with Facebook
post #4 of 6 Old 02-28-2009
Senior Member
 
Join Date: Aug 2007
Location: NY
Posts: 2,247
Thanks: 1
Thanked 1 Time in 1 Post
Rep Power: 8
 
I guess I was thinking dinghy. on a bigger boat no reverse would get to be a pain
sck5 is offline  
Quote Quick Reply Share with Facebook
post #5 of 6 Old 02-28-2009
Ticon 30
 
dbruce85's Avatar
 
Join Date: Aug 2007
Location: Fort Erie
Posts: 147
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 8
 
I nave been finding the same situation with the outboard on my boat. Do you have an email address to contact Marc.
Thanks
David
dbruce85 is offline  
Quote Quick Reply Share with Facebook
post #6 of 6 Old 02-28-2009 Thread Starter
Hinterhoeller HR28
 
pvanv1's Avatar
 
Join Date: Nov 2007
Location: Hamburg and Wilson NY
Posts: 156
Thanks: 9
Thanked 0 Times in 0 Posts
Rep Power: 8
 
You can use their website contact form, or PM me for the direct tel and email.

Paul Van Voorhees
Certified Tohatsu TLDI Technician
Mgr, Obersheimer Sails
Buffalo, NY USA
pvanv1 is offline  
Quote Quick Reply Share with Facebook
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the SailNet Community forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
Please note: After entering 3 characters a list of Usernames already in use will appear and the list will disappear once a valid Username is entered.


User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Similar Threads
Thread Thread Starter Forum Replies Last Post
GPO-3 as backing material dgr Gear & Maintenance 4 11-07-2008 03:47 PM
seacock backing plates scosch Gear & Maintenance 6 10-05-2008 09:30 PM
Stanchion Backing Plates dakuehn S2 1 01-04-2007 03:47 PM
Mounting Deck Hardware Tom Wood Gear and Maintenance Articles 0 06-25-2002 08:00 PM
Backing Plates for C&C34 Stantions fesivo Gear & Maintenance 3 01-20-2001 09:28 AM

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome