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AQ170 propeller

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Jeg kigger på en Seafarer II. Jeg har fået oplyst motordetaljer med performance, som virker lav/dårlig: 2 st, AQ 170, marchfart 18 knob ved ca. 4000 omdrejninger, topfarten har ejeren aldrig selv målt, men skulle ligge omk 30-32 knob, propellerne er SP 15X17 på VP 280´er drev. Vægt oplyst til 3.000kg

Nogle, som kan give input, navnlig om propellerne kan være årsag til den ret lave performance?

Har en Midi i dag, et stk 4.3 GXi, propel 14½x21, marchfart ca. 22 ved 3100, topfart ca. 30kn ved 4000 omdr., vægt våd 2.200, forbrug 2l/mil. Heller ikke fantastisk, men OK.

Har ikke forstand på motorer, optimering af pitch på propel mv., så vil være taknemmelig for gode råd.
Mvh
Jens

2020-11-05 09:45

Jens Hahn-Petersen
Medlem
24 Midi

Max revolution on aq 170 should be
4500 to 5000,constant max revolution should be about 20%below this
All calculated on clean hull max total weight including fuel and passengers
These engines now old and original specification was dubious and possibly overrated
Pitch variation will approximately change 150/200revs max output
Hope this helps there is a website
If you Google boat propeller size calculation

2020-11-05 14:55

Peter Young
Medlem
21 Daycruiser

Max revolution on aq 170 should be
4500 to 5000,constant max revolution should be about 20%below this
All calculated on clean hull max total weight including fuel and passengers
These engines now old and original specification was dubious and possibly overrated
Pitch variation will approximately change 150/200revs per inch of pitch max output
Hope this helps there is a website
If you Google boat propeller size calculation

2020-11-05 14:58

Peter Young
Medlem
21 Daycruiser



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