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  Black Max vs SS Prop Performance

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Author Topic:   Black Max vs SS Prop Performance
davej14 posted 06-13-2004 08:53 PM ET (US)   Profile for davej14   Send Email to davej14  
I am experimenting with props and motor position for my 14 foot Dauntless and am in need of some experienced advice. I have a 75 Merc 2-stroke. I started with a Black Max 21 pitch. I was getting 41-42 mph on the gps with 4900-5000 RPM at WOT. The hole shot was not too bad. Recently I purchased a Black Max 19 pitch and now I am getting 39-40 mph with 5100-5200 WOT. The hole shot is somewhat better but I do miss the top end.

I am wondering if going to a stainless prop will improve the top end without compromising the hole shot. I was considering a Merc Vengeance 17 or 18 pitch as the next step, but a recent post mentioned that the Merc Vengeance props are prone to ventilation and that the Rapture or Stiletto brands are a better choice. I am running my motor one hole down from maximum up position and was thinking of lowering it one hole because I do get ventilation in turns with the Black Max. Now I am totally confused and looking for suggestions.

davej14 posted 06-15-2004 07:19 PM ET (US)     Profile for davej14  Send Email to davej14     
bump
LHG posted 06-15-2004 08:31 PM ET (US)     Profile for LHG    
You should get either a Mercury High Five or Laser II in 20" pitch. Both will run elevated, and will kill those other props in performance. The 5 blade will give you great acceleration and pulling power, which I understand can be a problem with the short Dauntless hull. The Laser II will give slightly higher top end. Run medium sized hole vent plugs.
Moe posted 06-15-2004 08:48 PM ET (US)     Profile for Moe  Send Email to Moe     
Keep in mind there are other things happening simultaneously, besides the change of prop, that could easily cause the loss of 1-2 mph. Like the weather heating up, humidity going up, etc.

--
Moe

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