Cruising Sailors Forum Archive
It is clear that your hull is semi-planing or planing in design...
In Response To: Thanks Todd. It doesn't match the real world though ()
The calculations I have are for pure displacement hulls. I would have to write a new program to take the planing characteristics of your hull into account. That is why it doesn't work for your boat. Also, I assumed your engine was a 3,000 rpm engine.
Messages In This Thread
- Seasons almost over, what are your best boat improvements for 2011?
- Rewiring the 110V circuits.
- New fuse panel, battery monitor and some rewiring.
- Nice Tom ! And what type / manufacturer of belt ...
- Tom love the clear engine panels
- I improved the skipper with ham radio and SCUBA certifications.
- Two of them, 1st one are four new Lifeline 150Ah batteries ...
- ... and the 2nd one was the new Raritan Marine Elegance electric-flush Head ...
- Nice! What is the lifespan of Lifeline batteries John?
- Yes AGM, they tell me 10 years, we'll see about dat mon ! Cheers, John
- Probably more likely 3-7 years, depending on use/care and charging system
- There's ten years on the Optima 31's in our old boat...
- We had a Optima as an engine start battery
- My Optima lasted....
- There's ten years on the Optima 31's in our old boat...
- Probably more likely 3-7 years, depending on use/care and charging system
- Yes AGM, they tell me 10 years, we'll see about dat mon ! Cheers, John
- Just switched away from Lifelines
- Lifelines (and any AGMs) need to be fully charged periodically...
- Lifelines are different....
- Lifelines are different....
- Lifelines (and any AGMs) need to be fully charged periodically...
- ... and the 2nd one was the new Raritan Marine Elegance electric-flush Head ...
- Two big
- Pretty big list this year
- The biggest ones were new holding tank and new broadband radar/c-p/fish-finder
- My summer was spent putting an addition on my house... but there is a serious boat component
- I cleaned and coated
- out with the - in with the new
- I dropped this new Volvo-Penta D2-40 in
- After realignment I did a speed versus engine rpms run...
- Here is a picture of the boat..
- Is that where the engine tops out, Todd, around 9 knots?
- Top speed was 9.1 knots at 3,150 rpms...
- How are you calculating burn rate?
- I have a plastic tank that I can see the side of...
- That would be really nice info to have
- It is remarkedly simple to calculate fuel burn versus speed if...
- How would you do that? What info is needed?
- For a first approximation, waterline length and displacement
- The calculations are a bit too involved to write up here...
- I can give you everything now, but BWL
- corrected LWL to 36.75 feet in post above
- Larry - here is a crude estimate...
- By the way...
- Thanks Todd. It doesn't match the real world though
- Also, we average about 1.25 GPH at 7.5-8 knots cruising speed
- It is clear that your hull is semi-planing or planing in design...
- I have a friend with a 40' tri, he once couldn't turn it into the wind under power.
- What auxiliary do you have? 4,000 RPM?
- corrected LWL to 36.75 feet in post above
- I can give you everything now, but BWL
- The calculations are a bit too involved to write up here...
- For a first approximation, waterline length and displacement
- How would you do that? What info is needed?
- It is remarkedly simple to calculate fuel burn versus speed if...
- That would be really nice info to have
- I have a plastic tank that I can see the side of...
- How are you calculating burn rate?
- Top speed was 9.1 knots at 3,150 rpms...
- Here is a picture of the boat..
- After realignment I did a speed versus engine rpms run...
- Flat belt kit for high output alternator
- It had something to do with
- Fantastic projects everyone! . . .
- Rewiring the 110V circuits.
No, but I always wanted one of those model engines you could see through. 