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Tom Lathrop

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Tom Lathrop last won the day on April 16

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About Tom Lathrop

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    Advanced Member
  • Birthday 09/17/1931

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    Oriental, NC

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  1. Tom Lathrop

    Head Door

    M.C. Escher would be proud Chuck.
  2. Tom Lathrop

    Capsized abandoned retrieved

    I think you might get away with Paul's idea of a rabbet but you'd need to be careful of the sharp plane edge biting into the topsides. My first thought would be to attach a guide block to the rabbet plane that rides on the deck. The depth would of course be set to the deck thickness. I've used this idea on different jobs and even drilled and tapped a mounting hole(s) in the plane body. To me, a tool is a tool and I don't mind modifying them.
  3. Lots of boats like to sail around at anchor and I've had a fair share of them. Bluejackets like to swing around and maybe someone who has tried a steady sail can offer some results of that. The lack of a keel and lots of above windage plus light weight all conspire to promote sailing about. One sure way to prevent sailing about is to shift the anchor line tension off the bow. I set the anchor and bend on a rolling hitch about 15 feet or so out from the bow. This second line can be taken aft and pulled in enough to shift the bow off to one side. This biases the anchor pull off center so the boat cannot pass through the neutral point of the normal swing. How much offset is used will depend on the particular boat and other conditions. In light wind conditions, I often anchor by the stern which will prevent sailing about as well as make for a quieter sleep. Of course many use two separate anchors at an angle off the bow and is some cases where a shifting tidal current is expected, both bow and stern anchors may be necessary to keep your boat away from other in the anchorage.
  4. I doubt that the crane in the photo is aluminum but you can ask Rick Lapp for better information. Most dinghys will be too heavy on a cantilever for aluminum and steel will be needed. It is certainly possible to have a wood mast attached to the pilothouse bulkhead and use it for both a dinghy hoist and a steady sail. Don't forget that the height of the mast can cause problems in some areas unless it is in a tabernacle It will also need some guy wires unless it's very strong and heavy. Flapp@evanhospital.com
  5. I agree with you about Russell's PT-11. I discussed it with him some time ago and he filled in some points of the design that were not so obvious. Of course, I have forgotten all about it by now. Its a bit long for the pilothouse top though.
  6. Two years ago I had the urge to build another boat just because I had not built anything much recently. The Kudzu SOF boats caught my eye and the Stonefly is certainly a handsome example of a nice canoe. The book was purchased and the technique studied to evaluate just how it might work out and compare with the B&B Birder kayaks I build in the past. One study was to predict the weight of a finished SOF Stonefly, which resulting in some disappointment. My fully decked Birders, built of 4mm occume ply weighed 32 1/2 pounds while calculated weight of the SOF Stonefly came to at least 40 pounds, using the best materials suggested by the designer. Some discussion with other builders verified that these predictions were reasonable if a bit conservative. These are single handed sport boats that would weigh quite a bit more if designed as good tender for a Bluejacket. Considering that all of former calculated weights of small boats have turned out to somewhat optimistic, the project was placed on the shelf. Reluctantly, I concluded that if a reasonably rugged SOF boat cannot be built lighter than a known plywood version, the project loses its luster. I'm sure a Platt Monfort type would be lighter but they look too delicate to me. I think the crane hoist system that Rick Lapp uses to hoist his dinghy on to the pilothouse top works very well. He has a commercial fiberglass dinghy which is probably heavier than a homebuild plywood one. I built an 8' B&B Catspaw which weighs 52 pounds. It is admittedly less rugged than most would want as I used 4mm ply but it does work. That dinghy is available and could be beefed up for a suitable tender by adding a sheath of Knitex glass to the bottom. 52 pounds is light enough to lift up on top but any such sized dinghy is really too awkward for most people to handle.
  7. Tom Lathrop

    Call for a BandByachts ice boat design

    Graham, I did not know anything about iceboats in 1960 when I built one in Northwest NJ, having never actually seen one. I must confess that I still don't know much more about them. My creation had angle iron filled sharp for runners and awning material for a lateen sail. Not fast but when ice crystals are hitting you in the face, you think its fast. So badly balanced that I had to recruit three kids to sit over the runners while hanging on to mast guy wires to get get decent steering. Yes, it was great fun until one day I was driven downwind fast, could not steer at all and rammed the dam, breaking the thing into many of its original parts. Last ice seen on my creek could not support a duck, which kept crashing through. Oh, and I also did not know how to sail either.
  8. Tom Lathrop

    Taylor and Alan's CS-20 MK3 #15

    Daja appears to approve of progress so far.
  9. Tom Lathrop

    Chick's Micro Power Cruiser Project.

    Some folk have also been imbibing in the strange stuff along with Chick.
  10. Tom Lathrop

    Chick's Micro Power Cruiser Project.

    One of my favorite demands when taking new work to draftsmen was "if I wanted it tomorrow, I give it to you tomorrow, I want it today" We had good rapport though so all was well and I never got thrown out of their space. Introduction of CAD slowed things down considerably until they and I got used to it. Took a Morgan 46 Out Island from Savannah to Nassau in the 80's. Even with a stop at West End, the whole thing was on port tack with wind 15 to 25 over the port deck. All sail controls were electric so the fact that my two crew mates were always seasick did not matter. Great run with no upwind tacking. I don't even allow particle board in my shop, much less on a boat or furniture. Bloody awful stuff.
  11. Tom Lathrop

    Chick's Micro Power Cruiser Project.

    Well Chick, I hope you did not do the engineering on Charlie's Windmills. I saw one of them punch the mast right through the bottom in a National Championship race on the Chesapeake in the 1970's. Rough and windy but never saw that before or since. Hooray for air tanks.
  12. Tom Lathrop

    Chick's Micro Power Cruiser Project.

    I felt fortunate to get a coffee break. Was able to go home with lots of dust of various compositions and did not have to pay for any of it.
  13. Tom Lathrop

    Outboard advice

    I chose the Bigfoot with the higher gear ratio for my boat as hedge for pushing a larger boat at lower than bass boat speeds. Because my boat turned out to be easy to push, that was not really necessary but I don't see a downside at speeds up to the mid 20's. At normal cruising speed of 12 to 18 mph, I think a big foot is likely the better choice. At higher speed, the big foot would undoubtedly have more drag because of the larger cross section of the gearbox. I think the standard Yamaha 90 has plenty thrust at any speed and condition for your boat. A standard Yamaha 70 is more than adequate for the BJ25.5. Graham's 26 has quite a bit more waterline beam (~12%) than a BJ of comparable LOA, so it may require as much power as the BJ28 for the same speed. While this is just an educated guess, it fits the data. Homebuilt boats are very often heavier than the designer intended and that factors in to power required. You don't actually know how a particular boat/motor will perform until a speed/RPM curve is made. That will also establish which available prop is best for the boat or whether a prop shop can improve things with a bit of pitch or cupping modification. Experience with a type is also useful and Graham may be able to help with that.
  14. Tom Lathrop

    Outboard advice

    The motor on my Bluejacket 24 foot cruiser is a Yamaha and it has been good for 18 years now. Builders of Bluejackets have used Yamaha, Suzuki, Etech and Mercury four strokes and all are proving to be very reliable and mostly equal. My recommendation is to get the one from a nearby reliable dealer. You will need some lever of routine or other service at some time and it is far easier and probably better to trail the boat to a dealer close by that you have history with.

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