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S&S Swan Maintenance - Maxprop pitch calculation
05 January 2018 - 06:52
#1
Join Date: 24 August 2013
Posts: 13

Maxprop pitch calculation

I'm trying to figure out the right pitch for following setup on Swan 41:

Engine

Craftsman CM4.42

Power 30,9 kW / 42 hp

Max. Engine Speed 3.000 rpm

 

Gearbox 

TCM60  ratio 2.65 

 

Prop:

Maxprop Easy, Four blade, 17inch

 

05 January 2018 - 19:51
#2
Join Date: 02 January 2008
Posts: 1547

Dear V-V

Your setup requires a fairly big pitch, more than the 24 degrees given in the Easy manual. Would like to ask if you can give the actual propeller diameter measured to the nearest millimeter?
Kind regards
Lars

07 January 2018 - 03:53
#3
Join Date: 24 August 2013
Posts: 13

Hi Professor

Seems that I had made error while writing the reduction ration. The correct ratio is 2.

Engine

Craftsman CM4.42

Power 30,9 kW / 42 hp

Max. Engine Speed 3.000 rpm

 

Gearbox

TMC60  ratio 2

 

Prop:

Maxprop Easy, Four blade, 17inch

unfortunately I dont't have that more exact than inches.

07 January 2018 - 10:42
#4
Join Date: 02 January 2008
Posts: 1547

Dear V-V

With reduction ratio 2.0 the recommended pitch angle is 18 degrees.
Let me know how it works out. Full throttle rpm and speed would be of interest.
Kind regards
Lars

07 January 2018 - 15:39
#5
Join Date: 24 August 2013
Posts: 13

Thank you Professor!

 

This really helps extesively.

 

I'll let know how things work out.

 

 

Kind regards

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