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  1. M

    What boat is this?

    Just the picture, there are 2 more pics, however none with ID plate/number
  2. M

    What boat is this?

    Hi, Just ran across this boat, I am curious if anyone can help me on the type, builder or designer of this boat. Thank, Marc
  3. M

    XPS Hull with glass

    Thanks on the rowboat tip, unfortunately not a rower... Funny to see your reactions where I am asking if any of you have any experience in strength calculations building this way. As explained we are looking to do a one off for test purposes. Not looking for the cheapest or lightest way. What...
  4. M

    XPS Hull with glass

    The hull will be glassed inside and out, no foam exposed anywhere. I know it doesn't make sense, however we want to compare this type of build and explore possibilities. That's why I'm curious if there is any experience with strength calculations using this method.
  5. M

    XPS Hull with glass

    Indeed, it takes up a lot of space. This is accounted for in the design, I am looking more specifically for major drawbacks construction/strength and durability wise. The bare weight will be around 600kg. However, This will be dependant on the thickness of the glass skin and the density of the...
  6. M

    XPS Hull with glass

    For test purposes we want to build a 24' open motorboat. We are thinking to have the basic hull shape milled out of XPS (or comparable foam) with high density inserts on sharp edges and for hardware mounting. Finish this shape with glass skin/epoxy resin. Since the foam doesn't serve as sandwich...
  7. M

    Propellor selection electric drive

    Thanks for the useful comments! Will keep you posted on future selections.
  8. M

    Propellor selection electric drive

    My apologies for not being clear enough. The CW Hood example was for clarifying there might be other reasons to go for electric i.s.o. choosing the most efficient drive. By the way, for ultimate efficiency we hoist the sails and get free propulsion. Indeed I don't know much about props, if I...
  9. M

    Propellor selection electric drive

    Thanks for the replies! My prime mover selection is not at discusion, there has to be an electric drive. This is by customer choise, local regulations, space issues and/or ambition. We have a CW Hood 32 daysailer fitted with a 2kw Poddrive and a lithium battery stacked out of our way, this...
  10. M

    Propellor selection electric drive

    Thanks Yobarnacle, For a (potential) customer we are setting up an idea for an electric driven boat, full electric, or hybrid electric. The customer wants to have extra power when needed. Going upriver or running for bad weather. Hybrid electric is our first thought, however it would be a waste...
  11. M

    Propellor selection electric drive

    1 HP will indeed will always be 1 HP, no magic here or any expected magic. However the engine characteristics are way different, Electric motor @ idle: 0 RPM, Diesel @ idle: 600 - 900 RPM. I'm not trying to reengage any HP threads, I'm trying to figure out if there is any significant to achieve...
  12. M

    Propellor selection electric drive

    I have read quite a few posts on power differences on electric driven versus diesel driven. I conclude that you can go for a lower shaft power on electric compared to diesel. Most likely because there are no auxiliary components to drive like pumps and alternators etc. at least, I like to think...
  13. M

    Electric POD

    I'm looking for a pod engine somewhere around 2.5 kW, 24 V. all I can find until now are 36 V systems or higher and 24 V pods but not enough kW's. Anyone knows a 2.5 kW 24 V Pod? I want to use a 24 V system because I want to minimize the amount of batteries in my sailboat due to limited space...
  14. M

    Jet electric drive on sailboat

    Browsing the forum gave me some answers but not all, I hope you can give me some helpful comments. Situation now: 7,5 m Daysailer, 1.6 tons displacement, S-frame, Maximum hullspeed 6 kts, inboard electric motor, 2.5 kW max 1080 RPM, efficiency +/- 85%, 3 blade 12" prop, efficiency +/-...
  15. M

    Cat rigging?

    I didn't think of the weight issue yet, thanks for the tip. Reefing shouldn't be a big problem, since it is gonna be a daysailer for the small lakes and only realy when the sun is out. Also an option in this is, to design the sail in such a way that reefing doesn't realy change the CoE. I am...
  16. M

    Cat rigging?

    I need a little help on a design I am adapting for my personal wishes. I changed an excisting realy classic design to create a large cockpit for day sailing. However because of my design, the original location for the mast now goes straight down through the space I kind of wanted the toilet to...
  17. M

    Downeast hull design

    Thanks a lot for the reactions. Charlie, thhanx for the link, the boats shown indeed come very close to what I'm looking for, but still not quite the "touch and finish" I'm actualy looking for. MMD, thanks for the background information, sorry for using the wrong terms, since I'm dutch I'm...
  18. M

    Downeast hull design

    Hello mmd, thanks for the reply, but our interest goes out to a similar hull type as in the pictures I included in my first post. I presume your hull is round chime? We are looking for hard chime to make it a litlle easier to get the boat on high speed with a little less engine power. Marc
  19. M

    Downeast hull design

    Hello, I'm looking for plans of a hull of 27' to 29' of lobster boat / downeast hull, skeg style, similar to the hull of the Hinckley 29 or Arundel 27 (see pics below). We plan to build the boat ourself. I've browsed the internet for designs, but unsatisfactory untill now. Is there anybody...
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