Reply
 
Thread Tools Search this Thread
 
Old 14 September 2017, 11:12   #1
Member
 
Country: Spain
Town: spain costa blanca
Boat name: hd 380
Make: quicksilver
Length: 3m +
Engine: 25 suzuki
Join Date: Jun 2014
Posts: 20
twin outbord on sib

Hello together,

My project is to make something similar to these photo.

Just to have a sib with show effect.

So One Question. Are the Outbord Long or Short shaft ?

I think these are long shaft any reason ?

Please help.
Attached Thumbnails
Click image for larger version

Name:	kayak%20and%20boat%20009.jpg
Views:	190
Size:	107.2 KB
ID:	121854  
__________________

__________________
spainman is offline   Reply With Quote
Old 14 September 2017, 14:12   #2
Member
 
Country: UK - England
Town: Retford
Boat name: Spy-sea-one
Make: Mercury
Length: 3m +
Engine: Suzuki Outboard/25/4
MMSI: 235074042
Join Date: Oct 2011
Posts: 3,564
I would say long as the transom is a raised one above tube height
__________________

__________________
jeffstevens763@g is offline   Reply With Quote
Old 14 September 2017, 14:21   #3
Member
 
Country: USA
Town: S. Carolina
Boat name: D560
Make: Avon
Length: 5m +
Engine: 2016 Merc 115hp CT
Join Date: Aug 2013
Posts: 1,116
Quote:
Originally Posted by spainman View Post
Hello together,

My project is to make something similar to these photo.

Just to have a sib with show effect.

So One Question. Are the Outbord Long or Short shaft ?

I think these are long shaft any reason ?

Please help.
Shortshaft (15").
__________________
Richard
Gluing geek since 2007
office888 is offline   Reply With Quote
Old 14 September 2017, 14:32   #4
Member
 
Country: UK - England
Town: Retford
Boat name: Spy-sea-one
Make: Mercury
Length: 3m +
Engine: Suzuki Outboard/25/4
MMSI: 235074042
Join Date: Oct 2011
Posts: 3,564
Zodiac toobs 500mm? Transom raised by 100 MM I'd say 20 inch long shaft
__________________
jeffstevens763@g is offline   Reply With Quote
Old 14 September 2017, 16:21   #5
Member
 
Lee1's Avatar
 
Country: UK - England
Town: South East
Make: Waveline V SIB
Length: under 3m
Engine: Mercury 25hp
Join Date: Sep 2017
Posts: 134
This was a project I was going to do but I never got round to it, there is an excellent video on youtube where I believe 2 x 3.5hp Tohatsu slider throttle engines were used, with the slider throttles you can slide up the power on both engines individually without a complicated double throttle remote cable, the stearing linkage that was used was also very easy with just a ball joint bar connecting the two handles of the outboards, you could steer both outboards as one by turning either of the outboards tillers.
It's a good project as you don't have to worry about engine failure! As your back up is already mounted and running!
I did wonder what kind of speed you will get, the video showed the boat planning I believe, I'm guessing twin 3.5hp would give more tongue and thrust that say a single 7hp? Maybe someone can elaborate more on this?

Good luck with the project and please post some videos of it in action
__________________
Lee1 is offline   Reply With Quote
Old 14 September 2017, 16:22   #6
Member
 
Country: USA
Town: S. Carolina
Boat name: D560
Make: Avon
Length: 5m +
Engine: 2016 Merc 115hp CT
Join Date: Aug 2013
Posts: 1,116
Quote:
Originally Posted by jeffstevens763@g View Post
Zodiac toobs 500mm? Transom raised by 100 MM I'd say 20 inch long shaft
The pictured boat is a Zodiac Cadet 285S , circa about 1991.

400mm tube diameter. That's a factory transom, it takes a shortshaft.
__________________
Richard
Gluing geek since 2007
office888 is offline   Reply With Quote
Old 14 September 2017, 16:59   #7
Member
 
Country: Spain
Town: spain costa blanca
Boat name: hd 380
Make: quicksilver
Length: 3m +
Engine: 25 suzuki
Join Date: Jun 2014
Posts: 20
So my Transom is for Short Shaft I know it.

In the Middel 38 Cm on the sides 39 Cm becaue the transom has in the middle like a small down curve.

So I have to put 2 short shatfs ? or two long shafts this is really my question.

Please help. Because I have to order the motors.
__________________
spainman is offline   Reply With Quote
Old 14 September 2017, 17:03   #8
Member
 
Lee1's Avatar
 
Country: UK - England
Town: South East
Make: Waveline V SIB
Length: under 3m
Engine: Mercury 25hp
Join Date: Sep 2017
Posts: 134
Depends if your transom is the same hight all the way across, some transoms are cut out in the middle to take a 17-18inch single short/standard shaft outboard. If you have a cut out in the middle you may have to cut each side of the transom to meet the middle hight depending on how low the cut out is, ifs only an inch or 2 you should get away with using short/standard shafts. Double check by measuring the hight of the transom where the engines will be mounted to the water line.

This project is also about transom custom work as well as mounting the engines to move as one.
__________________
Lee1 is offline   Reply With Quote
Old 14 September 2017, 17:11   #9
Member
 
spartacus's Avatar
 
Country: UK - Scotland
Town: Aberdeenshire
Boat name: Sula
Make: Ribcraft 4.8m
Length: 4m +
Engine: Tohatsu 60hp + aux
MMSI: 235087213
Join Date: Jun 2007
Posts: 3,267
RIBase
When you say 'show effect', is this for actual use?

Twin engines on a SIB is pointless in my opinion. Controlling two engines will be nigh impossible.

I used to run a Zodiac GT 3.8m, aluminium floor with a Yamaha 25D standard shaft, 2-stroke. What a set-up. Great torque with two-up on board, frugal fuel efficiency, easy maintenance, and importantly it was easy to use in terms of manoeuvrability.
__________________
Is that with or without VAT?
spartacus is offline   Reply With Quote
Old 14 September 2017, 17:28   #10
Member
 
Country: Spain
Town: spain costa blanca
Boat name: hd 380
Make: quicksilver
Length: 3m +
Engine: 25 suzuki
Join Date: Jun 2014
Posts: 20
well it is realy a little bit grazy. but like in some youtube videos.

it works.

the transom hight in the middel with the cut is 38 cm and on the sides 38 cm.

so really the same.
__________________

__________________
spainman is offline   Reply With Quote
Reply

Tags
sib

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not 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 Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off





Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -5. The time now is 00:46.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.