Search found 68 matches

by fritz3000g
Tue Jul 17, 2018 8:54 am
Forum: MacGregor/Venture Discussion
Topic: Epoxy for Rudder
Replies: 5
Views: 2019

Epoxy for Rudder

I'm getting ready to modify my rudder on my Mac25. Was looking at West Systems for the epoxy, but it's a bit spendy. Is there a more affordable option that's appropriate for a rudder mod?

Thanks!
by fritz3000g
Tue Jul 17, 2018 8:53 am
Forum: MacGregor/Venture Discussion
Topic: Mac25 Upwind
Replies: 19
Views: 4741

Re: Mac25 Upwind

Here's a good explanation of all of this:
http://www.catamaranvega.com/vega/saili ... son11.html

Just learned that the scows which race on Lake Mendota have asymmetrical daggerboards on each side. You swap them on each tack. Learning so much!
by fritz3000g
Mon Jul 16, 2018 11:19 am
Forum: MacGregor/Venture Discussion
Topic: Mac25 Upwind
Replies: 19
Views: 4741

Re: Mac25 Upwind

Thanks Sailboat Mike. The roller reefing certainly has its weaknesses. At the moment replacing it isn't my first priority (getting a working motor is). I can always reef down smaller than I'd otherwise do if the sail bellies out. The fact that the leech is thinner than the luff means that it does te...
by fritz3000g
Fri Jul 13, 2018 8:36 pm
Forum: MacGregor/Venture Discussion
Topic: Mac25 Upwind
Replies: 19
Views: 4741

Re: Mac25 Upwind

Ok. So the forward motion and the fact that it is slipping is what provides the lift. Like this? (force strength indicated by arrow size)

Image
by fritz3000g
Thu Jul 12, 2018 10:06 am
Forum: MacGregor/Venture Discussion
Topic: Mac25 Upwind
Replies: 19
Views: 4741

Re: Mac25 Upwind

Sisu, I've been trying to figure out why making your keel into an airplane wing shape would help with leeway. An airplane wing and a sail both provide lift, but in one direction. A keel would provide lift in both directions (both port and starboard), cancelling each-other out, unless somehow you cou...
by fritz3000g
Mon Jul 09, 2018 11:37 am
Forum: MacGregor/Venture Discussion
Topic: Mac25 Upwind
Replies: 19
Views: 4741

Re: Mac25 Upwind

Interesting Sisu. If you get the boat out of the water at some point I'd love to see a pic. Thanks!
by fritz3000g
Mon Jul 09, 2018 9:33 am
Forum: MacGregor/Venture Discussion
Topic: Mac25 Upwind
Replies: 19
Views: 4741

Re: Mac25 Upwind

Thanks everyone! So the basic lesson is that I need the jib for beating and to get to that rudder upgrade. I didn't hear any mention of the stock around-the-boom furling that comes with the Mac25. In a blow, if I've got the jib up I'd have to heavily reduce the main, or gusts would dunk the rail and...
by fritz3000g
Sat Jul 07, 2018 5:57 pm
Forum: MacGregor/Venture Discussion
Topic: Mac25 Upwind
Replies: 19
Views: 4741

Mac25 Upwind

Hi there, I've been sailing my Mac25 this past week on Green Bay, in Wisconsin. Couple weeks ago I was in Lake Winnebago (very large lake). In both cases I had newbie guests along and because of weather forecast miscues had to do significant upwind beating into waves. This was uncomfortable and scar...
by fritz3000g
Sun Apr 08, 2018 8:17 pm
Forum: MacGregor/Venture Discussion
Topic: Yamaha Sailboat Motor Issue
Replies: 6
Views: 2964

Re: Yamaha Sailboat Motor Issue

I recall that you have replaced your thermostat too. Is that right? The ECM was causing my timing to not advance, which might be a similar problem if you are having trouble at higher rpms. Hey John, I'm not sure what you're referring to as the "thermostat". Mine has to bimetal valves and a diaphrag...
by fritz3000g
Sat Mar 31, 2018 8:51 pm
Forum: MacGregor/Venture Discussion
Topic: Yamaha Sailboat Motor Issue
Replies: 6
Views: 2964

Yamaha Sailboat Motor Issue

I've posted here before about my 1989 Yamaha FT9.9 4 stroke. Last year it had a confusing issue where it sputtered when hot. Anyhow I cleaned the carb very well (carb soak and ultrasonic cleaning) and that issue is gone. But it's been replaced with another. To test the hot sputtering issue I made a ...
by fritz3000g
Thu Mar 15, 2018 10:18 pm
Forum: MacGregor/Venture Discussion
Topic: Buoyancy calculation?
Replies: 31
Views: 10331

Re: Buoyancy calculation?

I've been following this thread and it seems like the Australian calculation doesn't include the extent to which foam will become waterlogged. Open cell foam is less dense than closed cell foam, for example, but everyone seems to think closed cell is better for floatation. Is there a number that any...
by fritz3000g
Tue Feb 27, 2018 6:05 pm
Forum: MacGregor/Venture Discussion
Topic: Polar Diagram
Replies: 11
Views: 2558

Re: Polar Diagram

Thanks for all the responses! The two stock headsails are a 100% jib and 135% genoa. I'm happy to help, though I'm not sure how (especially since my lake is frozen).

I think it's pretty rare to see something else, though I've read hear about one fellow who flies a spinnaker.
by fritz3000g
Sun Feb 25, 2018 8:10 pm
Forum: MacGregor/Venture Discussion
Topic: Polar Diagram
Replies: 11
Views: 2558

Polar Diagram

Anyone have a polar diagram for the Mac25?
by fritz3000g
Mon Jan 22, 2018 10:33 pm
Forum: MacGregor/Venture Discussion
Topic: Teak in Mac25?
Replies: 2
Views: 1285

Re: Teak in Mac25?

Thanks @Maraqita. I appreciate it.
by fritz3000g
Sun Jan 21, 2018 9:59 pm
Forum: MacGregor/Venture Discussion
Topic: Teak in Mac25?
Replies: 2
Views: 1285

Teak in Mac25?

Hi there, Does anyone know whether the companionway slats, the hatch sliders, the hull-to-deck joint cover, or the table trim on a Mac25 are Teak or something else? If something else, what are they? Mine look pretty awful, and I'm wondering if it's worth the bleaching regimen that folks recommend fo...