Could 27 hp fit here? - Page 2 - SailNet Community
 5Likes
Reply
 
LinkBack Thread Tools
post #11 of 15 Old 12-10-2012
Senior Member
 
dabnis's Avatar
 
Join Date: Jul 2007
Location: Truckee, CA
Posts: 8,627
Thanks: 2
Thanked 116 Times in 114 Posts
Rep Power: 8
 
Re: Could 27 hp fit here?

L,

Maybe I missed this, but have you had a chance to take it out to check speed and thrust against the Bay's nasty chop and churn? You might be surprised if it has the proper prop on it? Shouldn't cost much to ask for a short ride? From the specs you quoted it might be able to do the job?

Paul T
dabnis is offline  
Quote Quick Reply Share with Facebook
Sponsored Links
Advertisement
 
post #12 of 15 Old 12-10-2012 Thread Starter
Senior Member
 
L124C's Avatar
 
Join Date: Oct 2007
Posts: 1,398
Thanks: 51
Thanked 3 Times in 3 Posts
Rep Power: 8
 
Re: Could 27 hp fit here?

Quote:
Originally Posted by dabnis View Post
L,

Maybe I missed this, but have you had a chance to take it out to check speed and thrust against the Bay's nasty chop and churn? You might be surprised if it has the proper prop on it? Shouldn't cost much to ask for a short ride? From the specs you quoted it might be able to do the job?
Paul T
Started another more general thread about the boat, and the consensus among most owners of sister ships seemed to be the motor would be a little light, and that the 28 would have fit. Looking at a Alberg 35
If I decide to make an offer, it would be contingent on a sea trial and survey. Just trying to qualify it now. In addition to the boats lineage, the new motor was the strongest thing going for it, so sufficient power became the issue.
Now I'm wondering, what if conditions are benign during the sea trial? How do you really test for sufficient power? My biggest concern is not so much at sea (though that is certainly important), as handling in tight situations like a marina. For example, the boat might slide into her slip and stop on a dime on a windless day without current. However, how about with a 20 Knot tail wind. If the boat was bristol and slightly underpowered it would be one thing. However, I've got a lot of work to bring this old girl back to life, so it's important she's got the right motor, especially since it's new. Anyway, back on topic, seems the owner tried to save a grand and went with a light motor, as I suspected. How do I test it on a flat water day with no current/wind?
L124C is offline  
Quote Quick Reply Share with Facebook
post #13 of 15 Old 12-10-2012 Thread Starter
Senior Member
 
L124C's Avatar
 
Join Date: Oct 2007
Posts: 1,398
Thanks: 51
Thanked 3 Times in 3 Posts
Rep Power: 8
 
Re: Could 27 hp fit here?

Based on the picture in the OP, someone in the other thread was questioning the way the motor was mounted. The Beta Marine shop where the owner claims the motor was installed has a good reputation. When I looked at the boat, I wondered about the wiring on the new motor instrument panel, but blew it off. With someone questioning the way the motor was mounted, I'm now wondering about the wiring again. Doesn't look dangerous, but I would expect it to be much tidier on a new installation. Maybe he BOUGHT the motor at the shop, but had someone else install it.
Thoughts on the wiring and motor mounts?
Attached Thumbnails
1125121052.jpg   1125121050.jpg  
L124C is offline  
Quote Quick Reply Share with Facebook
post #14 of 15 Old 12-11-2012
Senior Member
 
dabnis's Avatar
 
Join Date: Jul 2007
Location: Truckee, CA
Posts: 8,627
Thanks: 2
Thanked 116 Times in 114 Posts
Rep Power: 8
 
Re: Could 27 hp fit here?

Quote:
Originally Posted by L124C View Post
Started another more general thread about the boat, and the consensus among most owners of sister ships seemed to be the motor would be a little light, and that the 28 would have fit. Looking at a Alberg 35
If I decide to make an offer, it would be contingent on a sea trial and survey. Just trying to qualify it now. In addition to the boats lineage, the new motor was the strongest thing going for it, so sufficient power became the issue.
Now I'm wondering, what if conditions are benign during the sea trial? How do you really test for sufficient power? My biggest concern is not so much at sea (though that is certainly important), as handling in tight situations like a marina. For example, the boat might slide into her slip and stop on a dime on a windless day without current. However, how about with a 20 Knot tail wind. If the boat was bristol and slightly underpowered it would be one thing. However, I've got a lot of work to bring this old girl back to life, so it's important she's got the right motor, especially since it's new. Anyway, back on topic, seems the owner tried to save a grand and went with a light motor, as I suspected. How do I test it on a flat water day with no current/wind?
For starters you could run a course with a GPS and compare it with the projected hull speed, taking into account how dirty the bottom and/or prop is.

After that you could tow something like a small drogue to try to simulate head wind and/or heavy chop and see how much the speed drops off. If that cuts the towing speed a lot, maybe by a third or half, maybe it doesn't have as much thrust as you want. Perhaps comparing the numbers to your previous boat might give you a starting point.

Not very scientific, but it would be a place to start

Paul T
dabnis is offline  
Quote Quick Reply Share with Facebook
post #15 of 15 Old 12-11-2012
Senior Member
 
dabnis's Avatar
 
Join Date: Jul 2007
Location: Truckee, CA
Posts: 8,627
Thanks: 2
Thanked 116 Times in 114 Posts
Rep Power: 8
 
Re: Could 27 hp fit here?

Quote:
Originally Posted by dabnis View Post
For starters you could run a course with a GPS and compare it with the projected hull speed, taking into account how dirty the bottom and/or prop is.

After that you could tow something like a small drogue to try to simulate head wind and/or heavy chop and see how much the speed drops off. If that cuts the towing speed a lot, maybe by a third or half, maybe it doesn't have as much thrust as you want. Perhaps comparing the numbers to your previous boat might give you a starting point.

Not very scientific, but it would be a place to start

Paul T
Forgot this, the Beta specs show 3,600 RPM. If you can,t get close to this the prop may be over pitched or dirty. Might be good to have a diver do a hull and prop cleaning before any testing?

betamarine - Engine View

Paul T
dabnis 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



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