Reply
 
Thread Tools Search this Thread
 
Old 01 May 2007, 15:26   #1
Member
 
Daibheid's Avatar
 
Country: Ireland
Town: Cork
Boat name: Cúr na dDonnta
Make: Excalibur + Zapcat
Length: 6m +
Engine: Merc120TDI,Tohatsu50
Join Date: Jun 2005
Posts: 321
Rollercoaster1 Bracket Dimension?

I want to raise the rear swinging roller set on my Rollercoaster 1 trailer to get the keel well clear of the swinging beam as the boat comes on to the trailer. I photographed the extra high support brackets on a Rollercoaster 5 thinking I'd just stroll into Indespension's agents and pick up two pairs.

Not so simple but they are willing to make them up for me although they don't have dimesnioned drawings. So I put together a dimensioned sketch but found I never measured the pitch of the 8 mm bolts on my RC 1 that support and secure the two 60x40 sections. (These sit lengthways on the swinging beam and carry a pair of rollers at each end) Can anyone provide the pitch of the two holes highlighted in yellow? It'd save me a drive to measure 'em and I can't find anything anywhere on the web so if someone has an RC1 sitting nearby and wouldn't mind running a tape over it.....? Even better if someone has a dimensioned drawing for these extra high brackets!

Thanks!
Attached Thumbnails
Click image for larger version

Name:	Rollercoaster 1.jpg
Views:	166
Size:	16.1 KB
ID:	26470   Click image for larger version

Name:	Rollercoaster 5.jpg
Views:	146
Size:	44.3 KB
ID:	26471  
__________________
Daibheid is offline   Reply With Quote
Old 01 May 2007, 18:30   #2
Member
 
Country: UK - Wales
Town: West Wales
Make: Vipermax 5.8, SR4.7
Length: 5m +
Engine: 150 Opti, F50EFi
Join Date: Sep 2005
Posts: 6,299
64mm
__________________
Downhilldai is offline   Reply With Quote
Old 01 May 2007, 18:36   #3
Member
 
Daibheid's Avatar
 
Country: Ireland
Town: Cork
Boat name: Cúr na dDonnta
Make: Excalibur + Zapcat
Length: 6m +
Engine: Merc120TDI,Tohatsu50
Join Date: Jun 2005
Posts: 321
Quote:
Originally Posted by Downhilldai View Post
64mm

Thanks Downhilldai for the superfast answer but I scaled the photo and came up with a range of 50- 60mm. Is that a centre to centre dimension and is it defo an RC1.

sorry to be cagey but this is going to be 8 holes in 4 brackets!

I know I know, I'm an ungrateful wretch!
__________________
Daibheid is offline   Reply With Quote
Old 01 May 2007, 19:08   #4
Member
 
Country: UK - England
Town: Bristol
Length: 5m +
Join Date: Mar 2006
Posts: 338
Quote:
Originally Posted by Daibheid View Post
I want to raise the rear swinging roller set on my Rollercoaster 1 trailer to get the keel well clear of the swinging beam as the boat comes on to the trailer.
Thanks!
Can't you just move the two roller sets closer together?

Won't this lift the hull higher and away from the swing beam?

Cheers,

Orve.
__________________
David G is offline   Reply With Quote
Old 01 May 2007, 20:45   #5
Member
 
Country: UK - Wales
Town: West Wales
Make: Vipermax 5.8, SR4.7
Length: 5m +
Engine: 150 Opti, F50EFi
Join Date: Sep 2005
Posts: 6,299
It's a Roller Coaster 1, circa 1994, braked version. Dimension is 64mm at hole centres.

Orville has a point - are the rollers that far apart that the keel fouls the beam? A bit of adjustment may solve your problem. The downside of raising the boat is that it's less likely to float off the trailer and will take a lot more wnching back on.
__________________
Downhilldai is offline   Reply With Quote
Old 02 May 2007, 06:08   #6
RIBnet supporter
 
bedajim's Avatar
 
Country: UK - England
Town: Rutland
Length: no boat
Join Date: May 2006
Posts: 2,500
Quote:
Originally Posted by Daibheid View Post
Thanks Downhilldai for the superfast answer but I scaled the photo and came up with a range of 50- 60mm. Is that a centre to centre dimension and is it defo an RC1.

sorry to be cagey but this is going to be 8 holes in 4 brackets!

I know I know, I'm an ungrateful wretch!
If they are making them up get one of the holes sloted
__________________
bedajim is offline   Reply With Quote
Old 02 May 2007, 10:34   #7
Member
 
Daibheid's Avatar
 
Country: Ireland
Town: Cork
Boat name: Cúr na dDonnta
Make: Excalibur + Zapcat
Length: 6m +
Engine: Merc120TDI,Tohatsu50
Join Date: Jun 2005
Posts: 321
Quote:
Originally Posted by bedajim View Post
If they are making them up get one of the holes sloted
I like that idea - thanks- must check see if they planned on drilling the holes or have a punch press or nibbler which'd make it easy to slot.

To Orville and Downhildai, fair point on the roller adjustment. I did bring them as close together as I could but the flat planing step, some deep chines and lateral stability limit this. The V in the bow is quite pronounced and is the risk area so I've no option but to raise the rollers. I have the bruised knuckles from the impact driver freeing up the U-bolts and the rusty socket set from the session at the slip the following day trying to optimise that adjustment option!

The points about having to sink the trailer deeper and winch more are spot-on too but raising the rear rollers is the best compromise to protect the keel during recovery.

Great feedback guys - it's great to have a a second opinion to help cover all options/implications.
__________________
Daibheid 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




All times are GMT. The time now is 07:55.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2024, vBulletin Solutions, Inc.