Biggest Outboard for Avon Redcrest ....

[Cloona]

the plan is to get a second hand outboard to back up the inboard - (a 45 year old Vire 7hp) - and to get it to double up as outboard for the Avon.

all advice and suggestions very gratefully received.

 

[Blueboatman]

Hmmm.
3.5 4 stroke I have, which is oodles for the Redcrest.
However I suspect that if you were to put the bow against a restraint like a wall, say, or a big yachts inertial resistance to forward movement, you may not be able to apply the full 3.5 without the prop thrust 'bending' the Avon disconcertingly?
Try it b4 using in earnest?

 

[Tranona]

Biggest for the Avon is 3hp short shaft. Probably little use as an auxiliary on a yacht.

 

[VicS]

the plan is to get a second hand outboard to back up the inboard - (a 45 year old Vire 7hp) - and to get it to double up as outboard for the Avon.

all advice and suggestions very gratefully received.

From an Avon brochure ... 4Hp

 

[doug748]

I have moved my 4 ton boat a fair old way with a Redcrest +Tohatsu 3.5 lashed alongside, probably using just above half throttle. The technique is to set the motor running at the desired clip and then go aboard, using the tiller to steer

The nice thing about this set up is that the dinghy articulates itself against the roll of the boat and the prop stays immersed. A long shaft both unnecessary and a right pain for regular tender duty. I think a small outboard on the stern would be of limited use except in harbour or similarly dead flat water.

PS

I should add that it is very slow work but you get there.

 

[Cloona]

I have moved my 4 ton boat a fair old way with a Redcrest +Tohatsu 3.5 lashed alongside, probably using just above half throttle. The technique is to set the motor running at the desired clip and then go aboard, using the tiller to steer

The nice thing about this set up is that the dinghy articulates itself against the roll of the boat and the prop stays immersed. A long shaft both unnecessary and a right pain for regular tender duty. I think a small outboard on the stern would be of limited use except in harbour or similarly dead flat water.

PS

I should add that it is very slow work but you get there.

I have a an outboard bracket on the boat - its a Trident 24 - would a 3hp outboard be effective on it

 

[johnalison]

The problem with a Redcrest/Redstart is the weight in the wrong place and about 3.5hp would be about the most you would want. My 2.5hp Suzuki 4stroke has much more push than the old 2stroke 2.2 and would be one of my choices. The better fuel economy of a four stroke might be an important factor too.

 

[doug748]

I have a an outboard bracket on the boat - its a Trident 24 - would a 3hp outboard be effective on it

I think the difficulties arise when the boat starts to roll or pitch. I have no doubt you would get around in quiet harbour conditions but you would have to be canny about it.

 

[Tranona]

I have a an outboard bracket on the boat - its a Trident 24 - would a 3hp outboard be effective on it

You need to check the height of the bracket. If it is 15” above the waterline the small motor will fit. However you will find it very difficult to operate as you need to lean over the back. Might give you 2 or 3 knots in flat water.

 

[jwilson]

the plan is to get a second hand outboard to back up the inboard - (a 45 year old Vire 7hp) - and to get it to double up as outboard for the Avon.

all advice and suggestions very gratefully received.

I once put a longshaft 4.5 hp on a Redstart (smaller) and went quite quickly once I'd pumped it up hard enough to stop it banana-ing. A lot of the problem was the extra leverage of the deeply immersed prop.

 

[snowleopard]

I've used a 3.3 on an all-soft Avon. It didn't take kindly to full throttle so I wouldn't go any higher.

In the old days 1 HP/ton was reckoned OK for an auxiliary and 3 HP/ton was a motor-sailer. In those days the engine was there to get you home in a calm, otherwise you sailed. 3.3 HP would push anything up to say 5 tons in a calm. You don't say what the boat is but I guess if its main engine is 7 HP it can't be much over 3 tons.

 

[Boathook]

I have a Avon 100? sportsboat and chatting (many years ago) on to a Avon person at a boatshow he said that they tested their dinghys at twice the recommended maximum power. For mine this meant a 30hp on the back rather than 15hp. This gave me confidence with the 15hp, but it would have been easy to 'roll' it going fast into a tight corner imho.

 

[charles_reed]

I have moved my 4 ton boat a fair old way with a Redcrest +Tohatsu 3.5 lashed alongside, probably using just above half throttle. The technique is to set the motor running at the desired clip and then go aboard, using the tiller to steer

The nice thing about this set up is that the dinghy articulates itself against the roll of the boat and the prop stays immersed. A long shaft both unnecessary and a right pain for regular tender duty. I think a small outboard on the stern would be of limited use except in harbour or similarly dead flat water.

PS

I should add that it is very slow work but you get there.

That's the way I've done it - the big negative with the round-tail Avons is the design abortion of an alleged OB bracket - I'd guess that would disengage itself trying to move a displacement boat in any flavour above 2hp.

I've moved a 31', c 4 tonne boat about 6 miles through a seastate 6 with a shortshaft 3.5 Tohatsu on the boarding ladder. I got caught in a tramontana off Port Vendres, with no mast and a 1 tonne polybag around the prop.

 

[Cloona]

That's the way I've done it - the big negative with the round-tail Avons is the design abortion of an alleged OB bracket - I'd guess that would disengage itself trying to move a displacement boat in any flavour above 2hp.

I've moved a 31', c 4 tonne boat about 6 miles through a seastate 6 with a shortshaft 3.5 Tohatsu on the boarding ladder. I got caught in a tramontana off Port Vendres, with no mast and a 1 tonne polybag around the prop.

thanks for this - very re-assuring that a small engine will move a heavy boat -

and I think the top weight for the Avon is 20 Kg - is that correct ?

 

[Cloona]

That's the way I've done it - the big negative with the round-tail Avons is the design abortion of an alleged OB bracket - I'd guess that would disengage itself trying to move a displacement boat in any flavour above 2hp.

I've moved a 31', c 4 tonne boat about 6 miles through a seastate 6 with a shortshaft 3.5 Tohatsu on the boarding ladder. I got caught in a tramontana off Port Vendres, with no mast and a 1 tonne polybag around the prop.

with contributions like this you always want to know how come ?

what happened to the mast ?

 

[Daydream believer]

Seagull 40+ ????