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Old 27 October 2004, 16:20   #31
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thats waht im going to do I think zippy
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Old 27 October 2004, 16:27   #32
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Olly Hi

Be careful, as a double frame has more mounting points and can be fixed a lot more securely because its fixed to the transom and floor.

Nasher.
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Old 27 October 2004, 19:00   #33
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Today seen a single A frame fitted to new Zodiac Pro 12. It had two bolts on either side about 30 cm apart, fitting through transom. It was about 70-80mm in diameter and seemed very solid.
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Old 27 October 2004, 19:32   #34
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better pic
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Old 27 October 2004, 20:50   #35
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Absolutly no problems with my single A frame. Its really solid!! At the end of the day, what's your A frame going to do? Pull a Skier or another boat, to support the transom to mount a self righting airbag or just to hang nav lights, burgees and antennas off of?

If the latter there's no prob with a single, but if you don't think singles are sexy is a double worth the extra money and more timely installation.

Seems easy to me. Go and have the single made, fit it to your RIB and see what it's like. If you don't like it or your circumstances change, get it upgraded to a double. It'll cost the same in the end but might just save you some hard earned greenbacks if you like the "first attempt"!
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Old 28 October 2004, 07:03   #36
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This is my single "A" frame, built by Carisbrooke. It worked out at around 130. It's made with 40mm s/s with mounting brackets for nav lights. They put some eyelets and cleats on for flags etc. It also came with two slab's of metal to bolt to on the inner side of the transom, cept the original "U" bolts are in the way.. It was going to be placed inside the transom, cept the steering arm is in the way..
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Old 28 October 2004, 07:18   #37
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Quote:
Originally Posted by tcwozere
This is my single "A" frame, built by Carisbrooke. It worked out at around 130. It's made with 40mm s/s with mounting brackets for nav lights. They put some eyelets and cleats on for flags etc. It also came with two slab's of metal to bolt to on the inner side of the transom, cept the original "U" bolts are in the way.. It was going to be placed inside the transom, cept the steering arm is in the way..
So not very well thought out or planned then !!
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Old 28 October 2004, 07:28   #38
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Single V Double

A single tubed A frame will no matter how strong the fixing points are fold over at the point where the tube meets the top edge of the transom if enough pressure is applied from behind, so its irrelevent how many bolts or fixing points go through the transom, the weak spot will always be the spot where the tube clears the transom !! this is fact, i've seen single tubed A frames bend and snap with only a small amount of loading.

This is less likely to happen to a double as there will have to be additional fixing points inside the boat, this means the structure is more stable and less likely to be bend at the same point as a single ! the obvious down side of a double is the space it will take up and the extra weight (depending on tube size) at the transom, on a small boat weight and space are at a premium.

You need to decide what you want the A frame for, if you want to tow a wake board then your best to go for a big double, fix the anchor points through the deck and transom and run cables to the bow to take the loading, if however you just want to mount an ariel and some lights then a single will of course do the job adequately enough.
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Old 28 October 2004, 07:28   #39
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So not very well thought out or planned then !!
nah.. way more fun like this..
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Old 28 October 2004, 07:31   #40
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I agree with the strength comment, the top of the transom has a lip towards the back, so when I bolted the frame on, it had have spacers. but, as the frame is only going to be used for lights and flags, strength isn't a worry. It's not gone onto a rib that will be used in extreme conditions..
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