Bayliner 175 overrev with 21P?

[severinbb]

Re: Bayliner 175 overrev with 21P?

I took the data once. If I can find it I will share it with you. Obviously it's not 12% but the shape and weight of the boat dictates that it won't be too bad. I can get on plane in 2-3 seconds so that speaks somewhat for the performance of the hull at the lower speeds.

Mark

Hi. No big deal. Your performance sounds good. I was just curious what might be normal.

Here's what I found...

	rpm @30	slip @30	rpm @35	slip @35	WOT spd	WOT rpm	WOT slip
Alpha 4 20P	3700	19%	4200	16%	44	5150	14%
Mirage Plus 21P					44	4700	6%
Black Max 21P	3800	21%	4200	16%	44	5100	13%
Rev 4 19P	3600	12%	4200	12%	45	5100	7%
Laser II 21P	3400	11%	4000	12%	47	5000	6%
HighFive 21P	3600	16%	4150	15%	44	5200	15%
Bravo I 22P	3200	10%	3700	9%	44	4650	9%
Tempest + 21P	3400	15%	3850	13%	46	4900	10%

Another finding:

• If I had a lot more power then the best prop would probably be different than the one I chose. It's not just about the numbers but also how the prop felt in specific situations. The Rev 4 scored big points in low-plane performance. Yes, I will have to watch I don't over-rev, but that's the compromise for good holeshot.

 

[Texasmark]

Re: Bayliner 175 overrev with 21P?

Hi!

Out of curiosity, what is your slip at "high cruise" versus WOT?


SB

Found the data:

On plane 18 mph slip 40%
20 35
25 26 This would be my comfortable cruising speed
28 22
32 20
38 12
43 11
50 9 All but pad out of water...less boat drag. See Avatar Pic.

Data taken in winter on a cold day. Numbers are GPS with just me in the boat. Altitude is about 800ft.