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Published 14.08.2013 | Author : admin | Category : Wooden Yachts

I am working with a great group kids from Santa Monica HS (called Team Marine) who are building a solar powered boat as part of the Solar Cup competition put on by the MWD (Metropolitan Water District) in So Cal. We built a boat last year flying by the seat of our pants and this year we hope to put a lot more thoughtful engineering into our project.
Your input, experience and advice (which may include referrals to a good psychologist) are appreciated. The other would be to provide the best efficiency as we try to see how far we can go in 90 minutes balancing the power drawn by the motor with the the solar panels ability to recharge the batteries. I would think that the smaller the angle of the drive shaft, the more forward force produced. I know this is an odd collection of parameters and applications to work with, (at least it feels that way to me) but we greatly appreciate and help you can give us. The best prop configuration will be a large diameter propeller, turning slowly on a curved shaft.
A pushing propeller is self-aligning to the flow so does not need much support (really none) if it is aligned with flow. Marine propellers have evolved the way they are for a variety of reasons and efficiency has not been a primary driver.
You are likely to find a large model plane propeller that will be most suited to what you want to do. I can do design for you but it is a school project so it is a matter of how much learning you want to get from the exercise.
The first thing to determine is the maximum power that the batteries can deliver for the 20 to 30 seconds it will take to do 200m. Third is to estimate the combined power you can get from the solar panels and batteries for 90 minutes.
The motor is a small black outrunner that you can just see turning over driving the two stage belt reduction. Location: Milwaukee, WI Weight is the most important parameter that you can control. Location: Ontario Within a tightly controlled fleet like this, resistance is pretty closely linked to weight. In solar car races, weight is so critical that they had to set a minimum weight limit for the driver- 80 kg fully dressed, and if you weigh less, you have to add ballast.
Rick makes some good points- he's done quite a few ultra-high-efficiency, low-speed designs and you'd be well advised to consider the suggestions he made above.
Unless you are permitted to use lithium batteries the batteries will be the limit rather than the motor on top speed. If you provide the dimensions of the boat and the loaded weight for the races then I can produce a drag v speed curve for it. IMO the highest CCA batteries that weigh in under 25kg would be the ideal for the 200m Sprint. I am also researching if there are batteries that have a higher reserve capacity for the endurance competition. The people who have made curved shaft systems have had difficulty getting suitable shaft material.
If you wnat to understand more about the prop, i would suggest you contact baeckmo or daiquiri. Only 3 things to note, the speed of water in way of the prop, the power given, at the prop, and the rpm of the shaft. There is an inconsistency in information you provided as the battery you nominated has a weight of 20kg alone while you are only allowed a total of 25kg. Working on the smaller 38Ah batteries I figure you will operate at around 20A for the 90 minute distance run depending on the level of sunlight. Location: Milwaukee, WI What crew weight are you calculating the speeds with? Only 3 things to note, the speed of water in way of the prop, (we're in a reservoir so it's flat) power given at the prop , and the rpm of the shaft. Like on the 190SL forums, another project of mine, there are some strongly differing opinions. Sure I may sound like a broken records, but we really appreciate this help The kids are getting more and more pumped with the prospect of coming in with some designs and application never used before. When making potentially dangerous or financial decisions, always employ and consult appropriate professionals. If your comments consistently or intentionally make this community a less civil and enjoyable place to be, you and your comments will be excluded from it.
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Solar Cookers International sells the CooKit solar panel cooker for $39.00 USD online here.
Panel-style solar cookers are the first solar cookers that are truly affordable to the world’s neediest. The CooKit is made of cardboard and foil shaped to reflect maximum sunlight onto a black cooking pot that converts sunlight into thermal (heat) energy. Solar cooks frequently report that the money they save on cooking fuel purchases is used to for many essentials, such as extra food, school supplies, and medical care. Without having to gather wood or dung, breathe smoke, and tend a fire – all associated with traditional cooking – solar cooking is easy and safe for people with AIDS and other illnesses, the elderly, disabled and young orphans.


Solar energy is free and abundant in many areas of Kenya, providing a safe, clean, healthy supplement to traditional fuels. Co-developers are Roger Bernard of France and Barbara Kerr of the USA, with work also by Ed Pejack, Jay Campbell, and Bev Blum of Solar Cookers International. 35-minute instruction video of how to build a CooKit solar cooker, how to use it, and why Girl Guides and Girl Scouts are teaching the technology in fuel-short countries around the world. If you can't find a large flat piece of cardboard, consider building a Fun-Panel solar cooker instead or build one of the variations below. Printing the plans to size This diagram shows angles and measurements for making a CooKit exactly as Solar Cookers International manufactures them. The process is to determine how much larger the measurements on the plan are compared to what is printed.
Print - this should print the details out in the "normal" plan size which is reduced from the full size plan. Find distance on the printout, such as the width (122 cm, or 48 in) and measure with a ruler. You can also download this PDF file to print out the full-size template on 25 pages of 8.5 x 11 in (standard US Letter size) paper. To make clean straight folds in cardboard, first make a crease along the line with a blunt edge such as a spoon handle, then fold against a firm straight edge.
Make the slots a little too small and narrow so that they fit snugly to hold up the front panel. TO COOK A NOONTIME MEAL orient cooker so that it faces to the southeast, approximately where the sun will be mid-morning. TO COOK A EVENING MEAL orient cooker so that it faces to the southwest, approximately where the sun will be mid-afternoon. FOR ALL-DAY COOKING orient cooker so that it faces where the sun will be at noon or early afternoon.
Raise or lower the front flap so there is a small shadow, no more than half its width, under it.
On windy days, large stones or bricks can be placed on the edges of the CooKit, as well as under the front panel.
Glass bowls and pie pans can be used to raise the pot off of the bottom of the cooker (note that the pot would normally be enclosed in an oven cooking bag when using a panel cooker). Wietske Jongbloed created a simple frame to allow the use of normal plastic bags (instead of heat-resistant oven cooking bags).
Jose Albano created this frame to protect normal plastic bags (photo shows frame with bag removed).
Stephen Harrigan found that discarded plastic phone cards, which are readily available in Africa, worked well to strengthen CooKits in their most vulnerable areas.
To remedy the moisture problem inherent in a product made of cardboard, the Solar Cookers International East Africa Office and colleagues have added notebook binding tape, also readily available in large cities or capitals to seal steno notebooks for students. Nikwax has been used to waterproof and increase the durability of CooKits, reportedly extending the life of a CooKit by 50%. Friends of the Old (FOTO) staff members bind the edges of new CooKits to make them more durable in Katito, Lower Nyakach, Kenya. Solar Cookers International's standard CooKit calls for a lot of curves, which can be hard to make with a hand held blade. The new Elco EP-1200 with rated power of 12 shaft HP, continuous, is a totally enclosed 3-phase AC motor provides extreme reliability and efficiency with only one moving part (the rotor) mounted on two permanently sealed deep grooved ball bearings. An excessive depth may make the craft awkward to handle near shore and may increase the likelihood of encountering underwater obstacles.
They have evolved to be quite inefficient in small craft because power is abundant and fuel was cheap.
I can see how SketchUp Pro with the bundled presentation building software, Google Layout, would be a real time saver and would really improve the final output.
In 1994, a volunteer group of engineers and solar cooks associated with Solar Cookers International developed and produced the CooKit, based on a design by French scientist Roger Bernard.
A heat-resistant bag (or similar transparent cover) surrounds the pot, acting like a greenhouse by allowing sunlight to hit the pot and preventing heat from escaping.
Coming about twenty years after the first efforts to replace open fires with improved cooking stoves, the CooKit uses no fuel at all. With careful use and storage, a CooKit can be used for two years, reducing fuelwood consumption by two tonnes. Extensive field tests in the USA and in many developing countries confirm its performance, convenience, low cost, acceptance, and adaptability to diverse needs. This is a handbook published by Solar Cookers International that includes detailed plans for building a CooKit solar panel cooker.
It's yours for a donation of $20.00 (US) to the Girl Scout Solar Cooker Fund (postage included). Then the plan is enlarged so that it prints the actual size - where all displayed measurements match actual lengths. This time adjust the scaling to the percent calculated in the last step (619% based on the values shown in step 4). You can then trace this template onto cardboard to make a CooKit with the exact dimensions and angles as the model sold by SCI. Choose a limiting dimension and use this size in the calculations in Step 4 rather than the size shown on the plan.


Note that when solar cooking conditions are very good, you may be able to cook without the use of a plastic bag around the pot. For best results, solar cooking requires continuous, direct sunshine throughout the cooking period. Steven Jones found that raising the pot on a wire frame improved cooking in a panel cooker. It's early use was in refugee camps in Chad as a result of a collaboration between Nikwax and TchadSolaire.
Juan Urrutia Sanz of the Manos Unidas organization in Spain writes that his group promotes a variation on the CooKit shape that is easier for many people to make at home. The motor is splash proof and can sustain submersion for a limited period of time while still operational.
This allows the skipper to provide extra power at his or her discretion when needed for safety. In lightly loaded application like you have, with no serious draft restriction, an aircraft style propeller will be more efficient. The hardest, shall be the speed of the water, ie what wake factor to use which is related to your hull shape and location of the prop and any appendages. Elegant and deceptively simple looking, it is an affordable, effective and convenient solar cooker.
MS Paint will now automatically enlarge the plans so that they roughly match the original plans cm for cm (or inch for inch). Printers normally require a margin, so make sure you overlap one page with another and fold appropriately so that printed lines are continuous.
Therefore, if you have a 110 cm (43 in) wide pice of material you would divide the measured width on the plan by 110 instead of 122 (48 in). A bottom cylinder is supported by wire frame while a transparent cover, made of the same plastic material, makes access to the food very easy.
These can be laminated together using local cassava glue (cassava is grown all over Africa) to form stiff panels, thus avoiding the need to import thicker cardboard.
The batteries offer 6 to 8 hours of power to the motor before they will need to be recharged. The system is smaller and lighter than the gas or diesel motor it can replace and is easily mounted in the same location and manner as the gas or diesel motor would be. With a few hours of sunshine, the CooKit makes tasty meals for 5-6 people at gentle temperatures, cooking food and preserving nutrients without burning or drying out. Note that you can either build your own CooKit using the plans below or you can order a pre-built Cookit from Solar Cookers International.
Families can save scarce, expensive fuel for when they cannot solar cook and when economically capable, add other, higher cost cooking improvements such as modern biomass, smoke hoods, biogas, or liquefied petroleum gas.
This means the image should be magnified 6.19 times (619%) to match the values in the plans. When not in use, it can be simply folded lengthwise into thirds or folded flat into a 33 centimeter (13 inch) square. Join the eleven panels together with [5 cm] 2 in strips of worn out dress or shirt (using the cassava glue).
Senor Urrutia y Sanz reports that it cooks as well as the CooKit and actually has more reflective surface area. A single CooKit of normal dimensions (see below) is not able to cook a pot of food large enough to feed a large family. When using two plastic bags, one inside the other, temperatures can increase up to 20 °Celsius (68 °F) over what is reached using a single bag (source: SCN). Protect the perimeter of the 11 panels with more [5 cm] 2 in strips ([2.5 cm] 1 in front and 1 in back to stop delamination of the cardboard). The environmentally friendly 27e affords its captain and crew the same great sailing performance as that of a standard H-27 with the added benefit of being truly a green sailing vessel. This is done by a "poster print" and most computer printers and image programs allow you to create a poster print. I have sent it along to my uncle for review.Regarding the bed… have you planned some kind of flip-down wall-storage or something? I know you said that you left hardware information out of your design so far but one thing that you might want to add that can be wood is some plywood gussets at the peak of your roof rafters.
I really like your design, but I’m wondering, for people who are building somewhere other than where the house will end up, can a house this tall be transported?
Here in Florida, the shed people have to keep their roofs heights low, because the law limits to overall transport height on the road. An interesting modification would be a collapsible peak, that could be folded for moving, and popped up on site. In other words constructive critique is welcome, destructive mean-spirited judgements are not permitted.



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