dhays
Guru
- Joined
- May 26, 2015
- Messages
- 9,054
- Location
- United States
- Vessel Name
- Kinship
- Vessel Make
- North Pacific 43
I know we're talking bottoms here, but she's got great cleavage too!
58' x 15' x 6'
That is an achingly beautiful boat.
I know we're talking bottoms here, but she's got great cleavage too!
58' x 15' x 6'
I know we're talking bottoms here, but she's got great cleavage too!
58' x 15' x 6'
I know we're talking bottoms here, but she's got great cleavage too!
58' x 15' x 6'
Three blade props are better unless they are not enough blade area for your power.
Hmmm, data?
For screw-cutting through water, in general: Three blades are more efficient than four. Two more efficient than three. One more efficient than two... that is if it could be figured out how to properly balance one blade??
That said: The more blades the easier it is to balance the prop. Also, as I believe Eric mentioned... if three blade circumference can not be made large enough due to space limitations then adding an extra blade (or two extra blades) can solve the problem of ample sq. inch blade surface for required screw-cutting power.
This is general physics... including a bit of unique prop design engineering thrown in!
When I bought Content, she had the original White Superior 100s in there. I had to re-power in 2013, and went with Iveco 150s. The prop calculation said I should stick with the originals, 28x23. Original gearbox was 1:2 - new one is 1:2.9. Very economical (1.6 gph@7kts@1200rpm), and handling is great in tight situations. I'm no expert, though!
Art,
The old engines were pretty good......used about two gallons@1100RPM, which gave us about 7.5kts. I really couldn't say how many hours, because those meters didn't work when I bought her. However, they were installed in 1930, and lasted 83 years, so they covered some miles!
I reckon I reduced the weight by about a ton, maybe a little more. She'll run for home now at about 14kts, but I've not had her at WOT for more than a minute or two.
Eamonn
Eamonn
What was top speed at WOT with the old engines you replaced?
Art, they didn't get anywhere close, because I was afraid to run them over 1200.
Eamonn
Eamonn
What was top speed at WOT with the old engines you replaced?
Art, they didn't get anywhere close, because I was afraid to run them over 1200.
Eamonn
Duh - I should have realized that before asking question! Again, duh!! LOL
I saw this new boat on a news feed. A simple hull
SeaPiper 35 - Modern Compact Trawler - SeaPiper
SeaPiper 35 Specifications
• LOA: 35ft / 10.90 m
• Beam: 8ft-6in / 2.60 m
• Draft: 2ft-10in / 0.85 m
• Displacement: 16,300 lbs / 7400 kg
• Ballast: 2,600 lbs / 1200 kg
• Prismatic: 0.66
Sea trial video:
https://youtu.be/kO-TEHNBr3o
Sure hope there is a door for the transom. With the cabin door at deck level it seems easy to get pooped and have water in the cabin.
Spiffy looking boat IMO.