CEM 2 Lister

[Dorman]

I have 2 listers l am rebuilding with the proposal to place one in a tug shell some time in the future which will be built around it.

I have an offer on a remote 1.2 blackstone type gearbox--this is my quandary.

 

The shell l would like we feel needs to have limited draught due to our experiences with the current deep draught boat.

 

What would the min prop be reasonably on a 1.2 gbox with this lister 1200rpm max?

 

My thoughts would be to go 1.1 with shallow draught boat--or am l wrong?

 

Can the gearbox internals be changed as this is a good offer.

 

Cheers

Simon

[mykaskin]

I have 2 listers l am rebuilding with the proposal to place one in a tug shell some time in the future which will be built around it.

I have an offer on a remote 1.2 blackstone type gearbox--this is my quandary.

 

The shell l would like we feel needs to have limited draught due to our experiences with the current deep draught boat.

 

What would the min prop be reasonably on a 1.2 gbox with this lister 1200rpm max?

 

My thoughts would be to go 1.1 with shallow draught boat--or am l wrong?

 

Can the gearbox internals be changed as this is a good offer.

 

Cheers

Simon

 

You'll be fine on a 2:1 box on this engine. You can always increase the pitch or blade area on a prop to match if you don't have a lot of room to swing a large diameter. It's only 16 HP when all is said and done.

 

Mike

[Proper Job]

I'm no expert with prop sizing but 16hp @ 1200rpm give 70 ft lbs of torque (doubled if via a 2:1 box)

 

I would have thought a prop in the 18" to 20" range would be easy to achieve. Possibly a lot smaller with and increased blade area.

[casper ghost]

Depends what you call a shallow draft. My boat has only 21" draft and I have an 18x19 propeller. I expect you would need something slightly bigger but not by much. Crowthers can make a prop to fit but I was lucky and found mine second hand.

Casp'