Reply
 
Thread Tools Search this Thread
 
Old 19 June 2008, 08:35   #11
Member
 
Daibheid's Avatar
 
Country: Ireland
Town: Cork
Boat name: Excalibur
Make: Excalibur + Zapcat
Length: 6m +
Engine: Merc120TDI,Tohatsu50
Join Date: Jun 2005
Posts: 245
Ribcraft Double A-Frame

I've a Ribcraft with their standard Double A-Frame which is very well built and finished. The rearmost 'A' is bolted into the top of the transom but where you might expect the second/foward 'A' to bolt into the deck/hull it cuts back in for the last foot or so to bolt in low down on the transom.

It's not unlike Yoyo's frame except it bolts inside the transom.

Is this stronger or weaker for wakeboard towing when compared to a double A-frame bolted to the transom and the deck/hull? I think as the transom transmits all the engine thrust so carrying the towing stress straight to the A-Frame/transom rather than distributing it over the deck/hill and transom seems better. I mean the engine is basically trying to lever a ton of boat out of the water via the transom! But something's telling me the triangulation effect of spreading the A-Frame across the deck and transom is better but maybe that's only true if the A-Frame is a closed triangle?

Bottom line is does anyone know if the standard Ribcraft A-frame -purely transom mounted- can pull a middleaged waterlogged wakeboarder?
__________________

__________________
Daibheid is offline   Reply With Quote
Old 19 June 2008, 09:53   #12
Member
 
Country: UK - England
Town: Truro-Cornwall & Brazil
Boat name: Bananas in Blue
Make: Humber Destroyer 5.5
Length: 5m +
Engine: E-Tec 115
Join Date: Jun 2007
Posts: 385
Thats the type of frame I want Daibheid. I saw one of X-ribs towing frames at the boat show and that was bolted entirely to the transom like yours. I think Ribcrafts towing frames are the same and only bolt to the transom too.
Is yours a 1.5" or 2" dia tube? I'd phone ribcraft, it may be that your frame is basically the same as their towing frames just without the eye at the top....
Any chance you could post some pics of it. Espically where the Fwd frame comes back into ther transom......I'm looking to get one made up locally to same a few ús.
__________________

__________________
Markyboyo is offline   Reply With Quote
Old 20 June 2008, 05:29   #13
Member
 
Daibheid's Avatar
 
Country: Ireland
Town: Cork
Boat name: Excalibur
Make: Excalibur + Zapcat
Length: 6m +
Engine: Merc120TDI,Tohatsu50
Join Date: Jun 2005
Posts: 245
as requested

Here's what I have to hand - I think you'll get what you need to sketch something for your local fabricator but if not I could take some more pix next week.
Attached Thumbnails
Click image for larger version

Name:	Af1.jpg
Views:	128
Size:	10.4 KB
ID:	35641   Click image for larger version

Name:	af2.jpg
Views:	125
Size:	16.8 KB
ID:	35642   Click image for larger version

Name:	Af3.jpg
Views:	115
Size:	9.9 KB
ID:	35643  
Attached Images
 
__________________
Daibheid is offline   Reply With Quote
Old 22 June 2008, 11:39   #14
Member
 
Country: UK - England
Town: Truro-Cornwall & Brazil
Boat name: Bananas in Blue
Make: Humber Destroyer 5.5
Length: 5m +
Engine: E-Tec 115
Join Date: Jun 2007
Posts: 385
Thanks for those, definately the sort of design I'm going for regarding the fwd frames attachment to the transom. I'll prob print those out & get sketching when I'm home!
__________________

__________________
Markyboyo 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 15:17.


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