Catalina 350 International Association

Yes Brett, that is what I am looking to do. I can easily get some data points of SOG at various RPMs, but how would I get gal/hour data by RPM that seems close to what I am actually observing. The Universal Performance chart seems to be about twice as high as what most of us experience in the real w...

Sargentef,

What engine & transmission do you have?

You commented that fuel consumption increased with the Gori propeller. What was your previous propeller, and how much did the fuel consumption change?

Thanks

My experience has been much in line with what Air Mobility noted. Over 8 years, I have typically used something around 0.6 gal/hour as a rule of thumb. We typically cruise around 2300 RPM. But, of course, in a span of 4-6 months between fuel purchases, there is a lot of time below that and some time...

You can download electronic navigation charts and chart plotting software from the NOAA website. https://www.charts.noaa.gov/RNCs/RNCs.shtml.

I would suggest that you select FL from the section on RNCs by States. It will download a package of about 90 charts.

Fifty, The chart resolution from Open CPN is a function of what charts you have downloaded and installed. If installed more or less detailed charts for the same area are selectable along the bottom of the screen. If you are viewing chart 11452 Shell Key will look something like this: Open CPN Chart1...

I am still confused by propeller 'optimization'. I tried thinking of a semi-trailer to help me understand it. In the case of a semi, it seems to me that the RPM and speed are directly related. Suppose you have an unloaded semi running at 3000 RPM and a speed of 60 mph. If somehow a helicopter could ...

My diver said he has done it but does not do it anymore. Too many small pieces to lose. I'm still researching.

Cuthbert, What's your hull number? You seemed to have shot holes in my theory that Catalina changed the transmissions with Hull No. 400 when they changed the standard prop to the Michigan M Series 14x10. I figured they increased the gear reduction to lower the prop RPM and help with the cavitation p...

Yep, We have the same transmission. Transmission Label.JPG I'm still not sure that I want to go with the 11 pitch prop, but I do understand the rational that the prop is spinning slower with the 1.88 gear reduction. I am just surprised that a 5% change in prop speed would require or accommodate a 1 ...

Response from Flexofold, the Plot thickens: if you have a gear reduction ratio 1:1,79, you´ll need a 15x10-3R propeller, if you have a gear reduction ratio 1:1,87, you´ll need a 15x11-3R propeller. If the gear reduction is higher, the propeller turns slower and needs to be larger/ more pitch. But I ...

Brett, Referring to the M-35B Service Manual, it shows the M-35B rated at 35 Hp at 3,000 RPM. Cruising Hp is about 20 Hp at 2400 RPM. It also shows the M-35B to have the Hurth HBW-100 as standard with a gear ratio of 1.79:1. I am nearly positive that our boat has the Hurth HBW-150A with a gear ratio...

How about this reply from FlexOFold. This has me really confused and a little scared. If many of the owners on this board seem to think the 15x10 is overpropped wouldn't 15x11 be even worse? Can there be that much difference in engines or transmissions or has FlexOFold changed their design slightly ...

Ken, I agree with you. A lot of links to that solenoid show not available. I did find one still available at http://www.necessityonline.com/index.php?main_page=product_info&cPath=&products_id=70335 , but I also agree with you and Brett. I think the continuous duty solenoid may be a better so...

Ken, I have had repeated failures of the pre-heat solenoid. I found the pre-heat solenoid to be a Ford Starter solenoid. I have used the black one like you show. It failed and I replaced it with a red 'Heavy Duty' one and it failed. Most recently I replaced it with a blue one that is supposed to be ...

Yep, Our HE is made the same with an offset location of the zinc. My guess is that at some point in time, the manufacturer 'upgraded' the HE to fix this problem. Older models need to be trimmed and newer ones won't. How to guess? Check to see if the zinc lug is off center. How to tell for sure? Pull...

I read in a Mainsheet a while back about someone who inserted a medicine bottle into the exhaust outlet on a Catalina 36 that eliminated the black exhaust deposits on the outside of the hull. I found that a 1-1/4" schedule 80 PVC pipe almost fit perfectly into our exhaust outlet. I cut a piece ...

I've not done any accurate speed tests. My guess is that we average around 5 knots at 2400 RPM. Sometimes 5.5 sometimes 4.5 depending on tide. A really strong tide and we can see 6 knots, but also have times when we can't get 4. I have no idea what top speed is at WOT as I've never ran at that speed...

Just finished testing results of the HE flush process I completed last week. Engine temperature at cruising speed dropped by about 10 degrees from where it was. Previously engine was running around 165 at 2,000 RPM and climbed close to 180 at 2400 RPM. After flushing temperature remained the same ar...

I finally had the opportunity to do some testing over the last week. Bottom was freshly cleaned. Out of gear our governed WOT RPM is about 3100 to 3200 RPM. After motoring for most of the day, while running in gear at 2400 RPM, went to WOT. RPM instantly went to governed RPM. That implies the boat i...

You can also replace the web straps with an angled solid strut as I did. They have some adjustment as they can slide along the top stern rail. They also provide some lateral stability in addition to vertical stability.