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Old 29 December 2022, 11:41   #1
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Avon 3.20 sport deluxe

Hello everybody
I am new to the forum and looking for some help.
i have just purchased a Avon 320 sports deluxe with a 25hp 4 stroke Yamaha.
Can anybody tell me the all up weight of this as I am hoping to carry it on my my Broom 450 on davits as a tender.
It does not appear to have any lifting eyes in the hull how big a job would it be to have them fitted
Thanks for any help offered
Dave
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Old 30 December 2022, 12:37   #2
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Hi Dave, I too am new to the forum but used to carry a much lighter 3.2m sib and Mariner 6hp on our Broom 44 which later became the 450.

I and others have found davits to be less than desirable in all but very calm conditions - proving very difficult to secure the high up centre of gravity weight from swinging around which also affects the stability of the mother ship - and impossible to launch in such condtions especially if its your only form of life raft.

We got rid of the davits and mounted the sib sideways and upright (ready to go with motor and 12L fuel tank) on the bathing platform with 2 quick release ropes at cockpit level. All the weight was carried on the bathing platform inches above the waterline meaning a very low centre of gravity and no swinging around whatsoever. This could then be launched and away in less than a minute.

This may or may not be suitable for your rib but there are other bathing platform mounting methods and hardware available giving the benefit of secure low centre of gravity and easy launching well worth considering in preference to davits.
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Old 30 December 2022, 12:48   #3
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Is also worth considering the total weight of our (relatively lightweight) sib, motor and tank was 91kg. Your rib and motor could be at least double that weight!

As a further caution: Our friends 44 with a rib and 15hp on davits, followed us out once in a choppy force 2-3 and vowed never to carry it on davits ever again!
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Old 30 December 2022, 13:02   #4
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With all that additional weight overhanging the stern, the fuel consumption, performance and even the ability to get on the plane will all be negatively affected.
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Old 03 January 2023, 12:31   #5
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Hi Papawhiskey
Thanks for your reply.
The rib i am talking about is very similar to the Avon jetrib and is on Cooney type davits (or will be)
Till this year it had an Avon 3.4 M centre console Rib with a 4 stroke 25hp outboard on it.
I was trying to find out how much more the 320 sports deluxe would weigh and how to fashion lifting eyes on it.
The cooney davits fitted to lots of broom are a cantilever type davit lifting from the bathing platform to normal davit height. The weight being taken equally on the transom and the bathing platform.
|I found with the previous dinghy total weight 220 Kilo performance and ability to get on the plane unaffected.
perhaps because the 450 has much bigger engines than the 44.
Dave
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Old 03 January 2023, 14:54   #6
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Hi Dave, Yes the 44/450 are superb boats that will really look after you if the going gets tough! They're so well/heavily built they really need at least 480-500hp engines for good performance when loaded - but fuel consumption will average less than 1/2 mpg at speed. However, we could average 2-3 mpg at more economical displacement speeds. The dinghy weight is definitely best carried directly on the platform. Cooney davits look like an elegant solution but I believe some owners got rid of them and prefer a hydraulic passerelle/crane to launch and recover the rib from cradles on the platform. Hope this helps, I don't have info on weights or fixing point but should be relatively easy to find out. Peter.
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Old 03 January 2023, 17:17   #7
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Hi Peter
I average just over a mile per gal at 18 knots fully loaded. Done many long trips in her one from Penarth back to the Thames at Windsor in 3 days.
At 12 knots using the tides we can easily get 2MPG
With Cooney davits the dingy weight is secured on both the platform and the transom. I much prefer that to blocking off the whole platform
Where do you moor usually
Dave
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Old 03 January 2023, 18:26   #8
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We had 380 each side but bigger engines can give better economy, downsized to a Kent 33 last year after a couple of years struggling to find anything I liked as much as the Broom. They are a hard act to follow but the Kent is a rare exception, currently ashore on the East Coast. What engines do you have?
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