Reply
 
Thread Tools Search this Thread
 
Old 17 February 2014, 08:36   #71
Member
 
Country: UK - Scotland
Boat name: Wildheart
Make: Humber/Delta Seasafe
Length: 5m +
Engine: Merc 60 Clamshell
MMSI: 235068449
Join Date: Apr 2007
Posts: 4,610
Couple of observations from experience:

Quote:
Originally Posted by Harrys Game View Post
I have a block mounted behind the jockey set which appears to be suited to just this purpose.I am thinking about a good old seagull,
Seagull - Open design like my old Johnson 2 & 4Hp engines (both of 1960something vintage design).

Never underestimate how little brine it takes to short an HT lead.....

I'm in the process of re - designing my A- frame to allow me to fit a slightly bigger sealed case Aux.


Quote:
Originally Posted by Wild_Bill View Post
so I'll keep the trolling motor lashed to the deck until it's needed. I'll pull up the gas motor if something happens to it and put it in the boat and then drop the electric motor in place and go.
I also used to do that (with a petrol burner) until I did a trial run of trying to dig out & fit the aux in a slightly lumpy sea..... All I'll say is make sure it's tied on before you fit!

Quote:
Originally Posted by The Gurnard View Post
..they are "wet" boats so expect water over the sides.
...even if they are, my rib is pretty dry but the spray off the main engine is enough to soak the Aux on a calm day.....
__________________

__________________
9D280 is offline   Reply With Quote
Old 20 February 2014, 16:29   #72
Member
 
Join Date: Jul 2011
Posts: 813
Quote:
Originally Posted by kaman View Post
I do like 'Kamans' bracket though. Might be worried if the sea got big in case a wave caught it, but I would never plan to be out in those sorts of conditions, although waves do get big very quickly off shore I have found out.

Not done anything more with the bracket lately but I'm nightshift this week and plan to do the following modifications to it.

Cut through the 50mm box section - cutting unit in half.
Weld a sleeve into the half to which the engine mounts.
Drill two holes in the box section on the half that mounts to transom.
Drill the sleeve with two corresponding holes
M8 stainless bolts to be used to secure both halves of the unit together.
Trim down engine mounting plate to improve clearance from the water.
Paint with hardened grey marine paint.

I've had a few concerns during this project.
Most have been resolved apart from that regarding the water clearance of the unit.
I am satisfied that the unit and transom are robust enough to do the job.
At present the engine mounting plate measures 150mm (15cm) top to bottom.
50mm (5cm) of this is in the 50mm square box section which sits above the top of the tube.
This leaves 100mm (10cm) sticking downwards - potentially in the way of the splish splash waves.
The overall diameter of the tubes are 450mm (45cm).
Having studied a few YouTube videos of similar Honwaves on the move in the chop the splash up at the rear comes up to the underside of the rear carry handles.
This unit is mounted slightly higher than the top edge of the rear carry handle.
As I sit at the opposite side of the boat (right) when using the Honwave this slightly tilts the boat to the right elevating the auxiliary engine side (left) upwards and further clear of the water.

The aux engine and main engine both short shafts.
The aux has been deliberately mounted approx 120mm higher than the main to aid water clearance.
As I will be transferring my weight to the left tube when using the aux this has the affect of tilting the Honwave to the left, lowering the aux into the water.
I often go out with a mate but they tend to sit on the seat up front which has a custom made leather cushion.
As they tend to sit in the middle they have no affect on the camber of the Honwave.

I can alter the height of the aux mount by building it up and trimming the lower edge to improve water clearance further at a later date if need be.

Worst case scenario if it does not work to plan and I can't leave the aux mounted whilst out at sea.
I will wrap and strap the aux down inside the Honwave along with the engine mounting plate.
I will clip on a safety lanyard to the aux to prevent it going over the side when clamping it onto the aux mount.
This way I will have a readily available back up as in my opinion there is no way you can lift a 50kg plus motor into a Sib at sea, and all but the simplest of repairs have to be done on dry land.
Time and sea trialing will tell.

I will post pictures of finished mods in the next fortnight or so do some trials and take it from there, fingers crossed!
Been doing some work on the aux out rigger bracket.
I have cut the box section bar and welded a sleeve into the engine mounting plate half.
This section is now fully detachable.
Im sure the engine and bracket will have enough water clearance on calm days as it is.
However when there's a swell or chop it may get wet/drag on waves.
Don't want this so I think im going to weld another section of box metal about 6 inches above the outrigger on top of the existing box section.
This will serve to carry the engine up out of the water and out of well out of harms way.
With the sleeved detachable engine mounting section, I will be able to vary the engines carrying position by drilling various holes in the the two different horizontal box sections.
This will allow me to slide the engine in towards the tube or out over the water and at two different heights.
A bit hard to put into words but I will post pics when complete.
__________________

__________________
kaman is offline   Reply With Quote
Old 20 February 2014, 17:02   #73
Member
 
Join Date: Jul 2011
Posts: 813
Bracket

A couple of doodles of what I was meaning in my previous post.
Nothing to scale but just to give an idea of what I was waffling on about.
Sleeved section to be secured into bracket with 2 x m8 stainless bolts.
Engine to be secured at all times to transom with safety rope........ Just to be safe!
I will get pics of finished item on in the next two weeks or so.
Attached Thumbnails
Click image for larger version

Name:	image.jpg
Views:	160
Size:	53.4 KB
ID:	91336  
__________________
kaman is offline   Reply With Quote
Old 20 February 2014, 17:04   #74
Member
 
Join Date: Jul 2011
Posts: 813
Bracket

Another doodle to illustrate my waffling
Attached Thumbnails
Click image for larger version

Name:	image.jpg
Views:	169
Size:	57.7 KB
ID:	91337  
__________________
kaman is offline   Reply With Quote
Old 20 February 2014, 20:52   #75
Member
 
Join Date: Jul 2011
Posts: 813
Quote:
Originally Posted by kaman View Post
Another doodle to illustrate my waffling
Adapt and overcome that's my philosophy!

Just adding the finishing touches to the out rigger whilst on my Nightshift.
Should be good to go in the morning.
Will post pictures in due course.

Again feel free to give your views.
It's good to see things from another perspective.

I have already been alerted to a couple of my oversights by fellow Ribnet members.

Ultimately I would have realised them whilst sea trialing tho!
Not good.

Just ordered some very large square stainless m12 washers to harness the m12 through transom securing bolts.

These will be sealed on the outside / water side of the transom section with sika flex.

The finished product is going to look a lot different from my original attempt.

Due to the Honwave having a very thick/robust transom I am confident that I can engineer / re-engineer this bracket to hold an auxiliary power source for my Sib.

Im not going to be blasting about at WOT with an auxiliary thrashing about on my bracket,

I will launch for fishing with my 20hp and troll 12 - 15 miles south then back, no more than 2.5 miles from shore.

Too far to row against a strong tidal surge.

Queue the ready waiting 2.5 hp auxiliary.

Fingers crossed anyway!!!!

I honestly don't think my Tohatsu 20hp is likely to malfunction any time soon but it only takes a poly bag to shear a pin and your screwed!
__________________
kaman is offline   Reply With Quote
Old 21 February 2014, 06:40   #76
Member
 
Country: UK - Scotland
Town: Glasgow
Boat name: snagglepuss
Make: Shetland
Length: 6m +
Engine: 90 hp Outboard
Join Date: Nov 2011
Posts: 562
Quote:
Originally Posted by Poly View Post
I'm not convinced that a tiny aux on a boat this size doesn't lead you into a false sense of security.

Close proximity to cliffs with a Lee shore, conditions where it is apparently too choppy to anchor - 2.5hp on an infrequently used engine, that you will have to get in position and started (having probably wasted a minute doing the obvious checks on the main engine) when things go wrong on a small boat it happens quickly.

for the 30 seconds it would take to start a small aux I prefer to have one and not need it than need one and not have it. I also dont often find myself in that scenario and there have been a few occasions where I have taken mine on other peoples sibs where I was v grateful for having it with me.
__________________
clydeoutboards is offline   Reply With Quote
Old 21 February 2014, 07:05   #77
Member
 
Country: UK - England
Town: Oop North
Length: 3m +
Join Date: Jul 2013
Posts: 323
What's the smallest, in weight/dimensions, 2 stroke outboard?
__________________
stray is offline   Reply With Quote
Old 21 February 2014, 08:03   #78
Member
 
Join Date: Jul 2011
Posts: 813
Sleeved revised edition

Took a couple of pics of the trimmed down bracket with the sleeve fitted.
This one shows the engine mounting plate removed and sitting in a position where it will be carried when engine is on the Sib and the aux is not being used.
I will weld another piece of box metal on top of the outrigger to carry the engine in the position illustrated.
The lowest part of the engine will be 50mm above the top of the tube whilst in this position.
The engine whilst in this position will be carried mainly over the top of the tube with only a small section overhanging the water.
This should keep it well up out of the way of splashes.
To use the aux I will undo the two bolts and attach it in the lower position, bolts back in and use.
Aux will be secured at all times with a lanyard to prevent it going over the side.
Attached Thumbnails
Click image for larger version

Name:	image.jpg
Views:	156
Size:	174.9 KB
ID:	91341  
__________________
kaman is offline   Reply With Quote
Old 21 February 2014, 08:06   #79
Member
 
Join Date: Jul 2011
Posts: 813
Sleeved revised edition

The bracket fitted back together in a position ready for engine use.
Attached Thumbnails
Click image for larger version

Name:	image.jpg
Views:	143
Size:	131.6 KB
ID:	91342  
__________________
kaman is offline   Reply With Quote
Old 22 February 2014, 19:13   #80
Member
 
Join Date: Jul 2011
Posts: 813
Quote:
Originally Posted by kaman View Post
The bracket fitted back together in a position ready for engine use.
Had another play with outrigger bracket today.
I have now decided on the final design!
Outrigger engine mounting plate to which engine clamps to be cut in half, I intentionally made it on the large side so I could play around with different set ups.
This will leave a very small engine mounting plate overhanging sib tube, but also serve to reduce the risk of the plate/engine catching on waves.
Surplus plate to be welded / bolted to the top of they outrigger 50mm box section - see pic!
This will serve as an extra transom, to mount engine to.
As this mount is close to the transom engine bearing stresses placed on transom greatly reduced whilst the Sib is on the move.
As can be seen from pic engine carried high clear of the water and on the inside of tube, well within harms way.
Engine to be attached to transom with lanyard at all times!
When needed engine to be unclamped from outrigger and clamped to the removable outrigger engine plate which overhangs left hand Sib tube.
Attached Thumbnails
Click image for larger version

Name:	image.jpg
Views:	175
Size:	96.6 KB
ID:	91390  
__________________

__________________
kaman is offline   Reply With Quote
Reply

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 21:33.


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