815 SSE Prop size?

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Medway Mudlark
Inlägg: 7
Blev medlem: 05 dec 2014, 23:21

815 SSE Prop size?

Inlägg av Medway Mudlark »

I have a 1984 815 sse with a VP AQAD40b 165hp on 280 leg. Can anyone advise me what size prop I should be fitting as:
1 - Have tried 15 x 17 which cavitates badly in following sea and does not achieve planing and no more than 15 - 16 knots
2 - Have also tried 16 x 17 boat planes at around 25 knots (GPS) but does not run away after the 'hump' engine revs at WOT are 3400 and are supposed to be 3600 rpm, which leads me into thinking it may be a 16 x 16 but VP do not make one.

Your thoughts and comments appreciated please
Regards

David.
Lars Lundbladh
Inlägg: 1499
Blev medlem: 26 jul 2003, 23:46
Ort: Sweden
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Re: 815 SSE Prop size?

Inlägg av Lars Lundbladh »

Hi David

The best for this motor/boat configuration would probably be to change to a DP bottom gear this can be changed without bigger work. However if you feel like 16x16 prop would work a propeller workshop should be able to change a 16x15 to 16x16 without any problem , I have tested this on a previsu boat. Have you tested the long hub and a HS propeller?
Another possibility would be to change to a 4 blade Solas propeller smaller diameter but more blades= bigger blade area.
Solas Art # 8814-145-17 14,5x17 see http://solaspropellers.com/index.php/pr ... rop-finder

I have tested propellers on a Fjord 815 SSE with a V8 260hp . The tested was published in a Swedish boat magazine I will try to find this and send it to you.

/Lars
Fjord 900 Dolphin -88 /D6
Ordförande och webmaster i Fjordklubben
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