What HP for an emergency get-you-home outboard?

[TheMerryFisher]

*Brushes dust off the thread*

Sorry to restart an old thread but did the OP get an outboard in the end? I too have an 805 and am looking to put an Aux. motor on the back as a just in case (Volvo Penta Tamd41p fitted), currently looking at 6hp outboards due to weight.

Cheers all!

 

[ontheplane]

I think a 6hp “sailpower” type would be ok but a standard 6hp too small?

The main difference is the lower casing, gearing and type of prop. They also have a high output generator so if the problem is a flat battery you could charge it quicker.

Yamaha do a FT version of their engines which have higher thrust and more torque to drive larger boats slowly not light boats fast. And a high output alternator.

https://cdn2.yamaha-motor.eu/prod/product-assets/2017/FT9/Factsheets/2017-FT9-9L_en-GB.pdf

Mercury do “sailpower” - same idea FourStroke 2.5-25hp | Mercury Marine can only see a 5hp

Tohatsu do a 6hp Tohatsu 6hp SailPro outboard engine
But their upgrades seem limited to just an alternator.

See who else makes them?

 

[PCUK]

My 14 ton steel cruiser had a 30hp wing engine which gave 6 knots. The main 300hp gave 12!

 

[ontheplane]

Exactly, this is why it isnt the HP that is relevant for an aux it's the thrust which is a factor of the torque, the gearing and the prop. It's why they have saildrive type engines for large boats with small engines.

The key is fitting a low speed, high thrust prop and the correct gear ratios to get max thrust from the motor.

 

[chuzzlewit]

*Brushes dust off the thread*

Sorry to restart an old thread but did the OP get an outboard in the end? I too have an 805 and am looking to put an Aux. motor on the back as a just in case (Volvo Penta Tamd41p fitted), currently looking at 6hp outboards due to weight.

Cheers all!

I eventually got a second hand two stroke extra long shaft 10hp Mercury. Thanks for all the comments.

 

[Plum]

I eventually got a second hand two stroke extra long shaft 10hp Mercury. Thanks for all the comments.

Thanks. What speed, tank volume do you have and what range do you get?

 

[freddyuk]

*Brushes dust off the thread*

Sorry to restart an old thread but did the OP get an outboard in the end? I too have an 805 and am looking to put an Aux. motor on the back as a just in case (Volvo Penta Tamd41p fitted), currently looking at 6hp outboards due to weight.

Cheers all!

Let me know as I am looking to do the same to my 805. Hardly been on the thing since buying and the list of jobs and piles of kit to install is getting beyond a joke.! We still restricted to 5km from home.

 

[TheMerryFisher]

Update: I have purchased a Mercury 6HP 2 stroke outboard which was in very very good nick and excellent price (I got lucky). Once I get my boat over I will give it a test and report back.

If someone else beats me to it please post your results!

Thanks all.

 

[longjohnsilver]

I eventually got a second hand two stroke extra long shaft 10hp Mercury. Thanks for all the comments.

Have you ever had cause to use it in anger? Rather than just testing it on a flat calm day

 

[chuzzlewit]

Have you ever had cause to use it in anger? Rather than just testing it on a flat calm day

Never in anger. It manages 5 knots in Poole harbour against a gentle breeze