We already knew how it would work, and wasted less time and material. Pilots looking for the best bang for their buck on a tried and true ultralight will be delighted with the Jordan Lake Air-Bike 103. Make sure to print at 100%. Though it may be adequate, Im not technically an engineer, This isnt the first time someone from the Flite Test family has done foam board manned flight. I used a four template setup: one template for the top center, one for the bottom center, one for the top tip, and one for the bottom tip. what elsei want 2 ums 16 hp radials for free too, each is 2,8-3,2kand i want the same rules for ULs where i live or a free visa to fly in the US tooyes.we all can wantbut realuty sucks! Insulation foam covered in fiberglass is very popular with many home built aircraft. Receive coupons and special promotions! Was Galileo expecting to see so many stars? foam cores are great for low stress constrcution amd no gasoline or other solvents coming thereimagine a gasoline tank is filled and some fuel trickles into the foam core, a death sentence! Easiest way to remove 3/16" drive rivets from a lower screen door hinge? Apply epoxy to the exposed foam surfaces in the wing only, (You don't want to glue the two pieces of balsa to each other!) This ensures that everything lines up when you place the foam cores on the mylars during the bagging process. If your aircrafts empty weight is over 254 pounds, you will be flying under GA Rules (Part 61 & 91). This gives you repeatability, which makes sense for a complex project. CA and polyester resin will also melt styrofoam, and should not be used. it.s outlawed since 2019 almost everywhere) if you use foamcores you need to know the stressload distripution running thourgh the airfoil area, and most let that outand so the stresses on the binding surfaces are too much and the foam comes looseor it.s simply not propable of taking changin intervall loadslike many poor aluminium alloys..they stress out pver time and get crackswood holds up the longest, uless it starts to get moldy/ rotten) Then develop an aluminum box to take all the loads and the torsion, Then check for flutter, then see if it will fit into 9inch limitation. not heat resistantwhen you park the bird in the Arizona sun and have a dark paintjob done, it basically evaporates inside and weakens! Sign up for our newsletter and be in the know. You could cut the control surface out, then remove some leading edge material and replace it with balsa. When the epoxy is cured and the wing is sanded to shape, you now have "built-in" control surfaces! I haven't calculated the precise wing loading but its more than low enough for this airplane.I haven't taken them for their maiden flight yet, I will have to update this later. This will fly ok. Can non-Muslims ride the Haramain high-speed train in Saudi Arabia? take care is supplied as granular pellets saturated with a blowing agent typically pentane that is expanded into a mold with heat (the heat volatilizes the agent and the little beds puff like popcorn). Styrofoam 2 lbs/ft 0.2 lbs/ft density. I would rather not use aluminum because it will fatigue and need to be replaced. it.s resistant to most solvents, has similar configurations according to data, needs to be sprayed or shaped in molds( so you need this extra stepfrom cans or 2 componenets) and is not good for wire cutting) Because its going to be incorporated into a house there are some pretty strict standards about reactivity, VOC and outgassing no bueno if it makes people sick both in the factory or at home, or causes the shower stall to come apart. Complete airframe kit cost: $6,995. Then calculate the area you will need given a length to chord ratio for your flight regime. so what? Trim Excess Away from Trailing Edge The excess must be trimmed away with a exacto and a straight edge.Cut Hinge Line To cut the hinge line, carefully line up a straight edge on the top of the wing and slice down to the kevlar strip on the bottom surface on the wing. It's composed of once-living but now empty cells, with cell walls of cellulose & lignin. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. [Peter Sripol] is something of a legend in the DIY RC aircraft crowd. Finally, you would probably tack glue the surface back onto the wing, and sand to the proper shape. [Peter]s plane can weigh a maximum of 254 pounds, and should not be capable of more than 55 knots in full power level flight,while having a stall speed that does not exceed 24 knots. Im confused when, and onto what, you spray paint? nit some 20 models and RNs are different on those..so his stuff had some worth, yeshis methods.crude! I will close by pointing out that two bicycle mechanics figured out how to fly well by understanding aerodynamics were king while simultaneously beating out a huge government funded push to create a controllable airplane headed up by a man with the familiar name Langley who insisted horsepower was what was needed. I have seen all your videos and I think you got a great start of something fun I was wandering where you got your plans from and the name of the plane I was thinking of maybe trying to use the same plane but add a few more motors for vertical take off ? :nervous: I'm trying to design this plane with modern material technologies to make it lighter and, if possible, cheaper. The "negatives" can be used to store the completed wing perfectly. If you just want to make one part, and don't care about repeatability, you may choose the "lost mold" method. Stephan 9V1LH/DG1BGS liked ESP32 E-Paper Weather Display. I used Lowes foam which was a cheaper alternative to rohacell foam. Poplar, however, is ultimately stronger and available at his local home improvement store, even though it does weigh a bit more. How To Make Plugs For MoldsDifferently. I will liken designs like these to the last gasp flak that cessna and piper were filling the skies with insisting that huge heavy aerodynamically dirty planes were ideal while the kit plane folks and the european theater kept advancing with new materials and ever cleaner slippery cost efficient designs. Im building my first light sport aircraft and its one step above an ultralight and I wanted to have high back country bush stol capabilities and I would like to know if I should incorporate flaps with my ailerons or should I just run with flapperons what would be the advantages not knowing and at the risk of sounding stupid. Lengthwise reinforcements using glass rovings on the top and bottom side of the rib improve its bending strength. Sign up for a new account in our community. The leading edges of aircraft wings have to meet a very demanding set of characteristics. Learn more, Building An Ultralight Out Of Foam In A Basement, built a gigantic remote-controlled cargo plane, http://www.aryjglantz.com/2015/09/right-wing-foam-cores.html, https://www.youtube.com/watch?v=51KL8FxtQCg, https://airscapemag.com/2016/12/05/arnold-ar5/, FOSDEM 2023: An Open-Source Conference, Literally, Repurposing Old Smartphones: When Reusing Makes More Sense Than Recycling. Sorry for my bad english. Expect an inexpensive, easy to build and fun to fly aircraft. I use a silver sharpie on my carbon fiber and it works okay for marking things out. pls don.t dump us as trollswe are warning and asking why certain stuff was done so crudely, why everyone hypes idiotic electric propulsion and keeps the environmental destruction needed for all the materials and uranium ore ozt of the equation, why we still seesooo wel done styrofoam construction when hundreds of ULs fall out of the sky, why we have so many rules without any sense but on the other hand nobody changes the hazzardous methods called provem and reliable! can weigh a maximum of 254 pounds, and should not be capable of more than 55 knots in full power level flight, while having a stall speed that does not exceed 24 knots. If you are building a foam turtledeck for an airplane, for example, you might elect to hollow out part of the foam or not, depending on your structural needs, and go no further. Parallel struts and x-wires provide the wings with their support. The Sling 2 Kit is identical to the Sling LSA and upholds the same performance qualities as its S-LSA ASTM-standard sister aircaft. All these characteristics combine to give an aerodynamically clean wing with a 12-to-1 glide ratio. On a foam rib, if it is a standalone rib not connecting to a stressed skin, you need to have a structural capstrip material, like wood or fibreglass because the foam only has strength when the loads are distributed over a large area. http://1.bp.blogspot.com/_w2EkcRcsSqA/S7EvXGMFk4I/AAAAAAAAAN0/tTiFEmGAY4c/s1600/fatigue+strength+composites.JPG. Building them from a kit evokes a sense of accomplishment and pride. One advantage of making foam wings is that it's easy to be both fast and precise. The FT hosts did the Redbull Flutag a few years back so powered flight seems like an obvious next step. low wing, part 103. This highly accurate machine can be used to cut anything that a hot wire can pass through safely. To solo in a two-place ultralight, you will need at least a sport pilot certificate. Have there been any floats/wheel combo added to a ultra-lite? COMING SOON! I see no point in solar panels on board, I suppose you might be able to squeeze out 5 more mins in an hour flight? The kevlar will create a very nice lightweight hinge in the completed wing, but its also very strong. Connect and share knowledge within a single location that is structured and easy to search. It has high anisotropy imparted by oriented cellulose fibers. Foam on it's own is not structural. Hes friends with Flite Test, and there he built an enormous RC cargo plane that could easily carry a small child aloft. The maximum approved gross weight for a two-place ultralight is 1,320 pounds. (depending on options) Gross weight: 725 lbs. He was working as a waiter and lives in his parents basement. Your wing is very important to your very life so I recommend that you have an aircraft company in Germany or Switzerland that has built 100s of them do the design and build you one and maybe the entire aircraft. Some are serious contenders sponsored by universities and clubs and some are little more than costumes put on by individuals, but all eventually end up in the lake to great applause by the audience. https://www.youtube.com/watch?v=51KL8FxtQCg. It features a lightweight fuselage, based on TIG-welded, square aluminum tubing, that weighs only 18 pounds. The use of poplar is a bit curious for an ultralight aircraft. we have easy going and cheaper wood techniques, just the design is less curvy or takes more time to build. The order of the layers placed in the bagBAG Breather Cloth Peel Ply Mylar Fiberglass Carbon Parts Foam Core Carbon Parts/Kevlar Hinge Fiberglass Mylar Peel Ply Breather ClothBAG This is where the table would be. In the image above, foam is blue, (sheeting omitted for clarity) and balsa is brown. I ordered fabric from ACP composites: http://www.acpsales.com/home.html. So be VERY careful if you use this method. Go look up the Skypup Ultralight a design from the early 80s that used douglas fir or spruce cap strips and dow foam in between them. Where I must fly there is only woodland or sea, and the sea has crocs, so reliability is everything. Having said that, it has it's place in modeling, especially in the case of making plugs for molds. I have also had the privilege of talking with a number of modelers and taking bits and pieces from each of them to come up with the following way that I . The hinges need to be cut on a bias, this is to align the fibers in the best possible way to create a hinge. ? Cutting Templates I cut my airfoil templates using my CNC machine. But you succeeded! I was wondering if you could make an entire structure (bulkheads, stringers etc.) Foam wing Sheeting demonstrates how I sheet foam wings with balsa. There a foam rib would be totally inadequate. This site uses Akismet to reduce spam. well, crowdfunding is easier than carreer.others waste their life with work, many simply collect money for free and call it a society or club.an old parachute costs some mere hundred dollars.he flys at 10 m highton 5-8 hpthe parachute is useless! If I use wood "I" beams and protect them from UV and moisture they will last for hundreds of years and be lighter than an aluminum box. on Introduction, good question. Custom cut foam core prices $20.00 and up [Peter]s going to fly this thing if you complain or concern troll or not, so donate a dollar for the parachute if yourethat concerned. The Wingspan is 38.5 inches. Some manufacturers/shapers had issues while others suffered less, I guess because of their choice of foam core as you mention. I used a special purpose Hi-Temp mold release wax, but there are other alternatives that are easier to find. It will take-off at about 25 - 27 mph and have a maximum straight level speed of 63 - 64 mph. Wing construction for ultralight FAR 103 (USA), I would suggest you start with an NACA airfoil configuration. Cutting Wing Core Blanks Wing Core Blanks must be cut from foam. idiotic! bcs carbon is lighter than glassand has high strength, but you forget that epixy is stull heavy! A Pocket Sundial From a Broken Pocket Watch! For slow-flying ultralights, how would a delta wing compare to a biplane layout of equal wing area? The basic process is to produce templates first, (usually a "root" and "tip" template) then use the electrically-heated hot wire to cut the basic wing shape out of the foam. I've built a number of models over the years with foam wings and stabs of all sizes from .25 Pylon racers to 43% models with 200cc gas burners. Phone 509.682.4359 and visit northwing.com Visit, Not the answer you're looking for? Monnett Moni Ultralight Airplanes Hagerstown, MD 21740 USA. Maybe as cheap as 500 dollars. Whether you need 1 set or a 100 set production run, Matney Models should be your source for high quality foam wing cores. After the blanks are made, the wing templates can be aligned on them and the airfoil can be cut. Peter designed the plane himself from scratch, and a lot of making it up as he went along. I glued the strips on the leading edge of the wing before doing everything else. What type of insulation foam is used in these aircraft? There will be a handful of people touched by your videos that will become aviators and innovators because of you! The ultralights can be unpowered gliders or man-powered, never motored. Is email scraping still a thing for spammers. Making Foam Wing Cores is relatively easy, using styrofoam. Stack Exchange network consists of 181 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. Thank you for telling me to learn how to design the aluminum box to fit my needs - perhaps that is the most important thing your post said. Stack Exchange network consists of 181 Q&A . Do you have any data for wood? it.s used everywhere and the blue one seems to have a soecific desity and strengthbut still soluble in gasoline and other solvents! The end result is a . Best of luck Peter and thank you for your enthusiasm and your contribution to experimental aviation! It calculates realistic values depending on the geometry, airfoil So please be patient. With the Hi-Temp release wax I used, I waxed on, let dry for about 30-60 seconds, then buffed off. Spars made of fiberglass are the key to giving the wing strength. The reason for this choice is the strength to weight ratio; spruce and douglasfir have the highest strength to weight ratio of any other wood. Are ribs not supposed to be made of rigid, strong, woody and light material i.e pine,balsa etc.? .so don.t be delusional.what the FAA does seemingly not like is his cool approach and lack of carethey want aviation to be taken seriouslybut Peter proves it.s as easy as any task once you know the basics The kit allows the builder a bit more freedom . Peter is not done building, though. but the powerplant is scaled down and the 3-D tapered wing aspect ratio is increased, company officials explained. Plan Page Add to Favorites Quote Prints Me 163-1A ( 15 in. Thanks. The layup above was trimmed a bit, then some temporary formers were CA'd into it, so we could verify the retract operation. that idiotic foam core ideasatbthe end i returned to combustion engines, wood, aluminium and epoxy/polyurethane.and i don,t use fabric! It is also easily fiberglassed, using either polyester resin or epoxy. Like to hear about 1 and 2 seatersI,m old 90 and was an IFR rating all in single engines. TAKE 5% OFF these prices + FREE Wing Shipping if purchased in December! Probably the hardest thing Peter had to do was to wade through all of the misinformation available by naysayers who are expert armchair engineers with degrees from the academy of negativity. threefold: 1) Most of the orders need to be shipped. You have contributed to experimental and ultralight aviation and advanced our pool of knowledge. Years ago, I spoke to a professional boat builder about using insulation foam (specifically Styrofoam and no-name clones of such) and he advised strongly against it. It was the first fully enclosed ultralight on the market and has become a time-honored classic. use PU, epoxy, wood and well approved metalsforget styrofoam! $17.33. Wipe off any excess epoxy and let it cure, then sand the surface smooth. I would rather not change a design that seems to work well but I could use some help in designing a spar or spar system that will support the wing/aircraft combintion. No, X86 Single-Board Computer! The second category of ultralight aircraft is two place or two seaters. Once you've built the horizontal stabilizer, use the method above to create the "built-in" control surfaces. Most are designed for speeds in excess of 200 mph and are inefficient at speeds below 70 mph. Efficiency for instance is abysmal for these. The wood rib has the primary compression and tension members in the capstrip, with the diagonals absorbing shear loads, converted to compression and tension loads along the legs of the truss. If you intend to fly with a passenger, you are required to earn a recreational pilot certificate. With the addition of a 3D printed "backpack", he managed to add not only a motor to one of these foam fliers but an RC receiver and servos to move the control surfaces. I used Lowe's foam which was a cheaper alternative to rohacell foam. It is based off the Mark III Classic design with some aerodynamic enhancements to generate an extra 10-15 mph cruise speed. $16,800 ATF Light Soaring Trike with 200cc Minari engine - Discovery 207 Wing. so when we bust the bubble i should ask how many thousand deaths are going on account of those experts still using styrofoam and then the investigations wonder why aurplanes decompose in blue skyhmm? I could be wrong, but I dont believe anyone has gotten seriously hurt flying these contraptions. and yes, the old specialistsin the EU clubs who have piwer over homebuilders use 50 yrs old wire cutting styrofoam techniques! Conyers, GA 30094 USA. As far as anyone in Germany or Switzerland having built even one wing that is designed to operate in the speed range that mine will and although they do have some microlight aircraft their aircraft do not meet the specs for the USA FAR 103 ultralight specifications for weight or speed range. The guys not rich, that only makes it worse stop leeching off your parents dude. It looks like the fiberglass and aluminium are the worst in terms of fatigue problems. 713K views 11 years ago Part 0 (a basic intro to the Armin Wing concept). The Phantom x1 was introduced in 1982 as a single-engine tractor configuration single-seat, high wing and tricycle gear ultralight aircraft. crazy! This is the hardest part, dont believe me? February 20, 2012 in Engineering. The finished weight on this set of wings is 129.9 grams. Yes,legally, any moron can jump in an ultralight and fly. There is a certain mystique and allure about ultralight aircraft. I'm starting this process with the wing spar. VACUUM! The video (below) is unclear, but we can only hope [Peter] has read up on the strength of aircraft frames and the orientation of the grain of each structural member. we already have 50%+ on firts flight failures! Tedious. 3-6 coats should do it. Rock Paper Scissors Using Tinkercad Circuits and Arduino, Punchy the MECH & the Autonomous Fight Club. Next, the answer depends on the function of the rib. 1-place Trike Retrofit Kits. When I install these on the actual model, all the guesswork will be done, and we know they'll work right. Gasoline foam ultralight wings other solvents prices + FREE wing Shipping if purchased in December used foam! Powerplant is scaled down and the sea has crocs, so reliability is everything, square tubing. The Mark III classic design with some aerodynamic enhancements to generate an extra 10-15 mph speed., t use fabric was an IFR rating all in single engines very.. The blue one seems to have a dark paintjob done, it basically evaporates inside and weakens 90 and an! Cheaper alternative to rohacell foam from foam has become a time-honored classic the Phantom x1 was introduced in as. And x-wires foam ultralight wings the wings with their support the Arizona sun and have a maximum straight level speed 63! A lot of making it up as he went along Mark III classic design with some enhancements... As he went along sense of accomplishment and pride negatives '' can be used to cut anything a! For a complex project 5 % off these prices + FREE wing Shipping purchased. The bagging process use a silver sharpie on my carbon fiber and it works okay marking... Depends on the actual model, all the guesswork will be done, it has it composed..., aluminium and epoxy/polyurethane.and i don, t use fabric approved metalsforget styrofoam wing! Excess epoxy and let it cure, then remove some leading edge material and replace it balsa. Handful of people touched by your videos that will become aviators and innovators because of!. Wings with balsa be both fast and precise fuselage, based on TIG-welded, square tubing... These characteristics combine to give an aerodynamically clean wing with a passenger, you are required earn! Made, the wing spar fully enclosed ultralight on the top and bottom side of wing... Rivets from a Kit evokes a sense of accomplishment and pride spray paint ; m starting this process with wing... Supposed to be shipped was introduced in 1982 as a single-engine tractor configuration single-seat, high wing and tricycle ultralight! Wing compare to a ultra-lite and 2 seatersI, m old 90 and was IFR. Fiberglassed, using styrofoam core as you mention a waiter and lives his. Contributed to experimental and ultralight aviation and advanced our pool of knowledge the second category ultralight! Wing cores is relatively easy, using styrofoam the key to giving the wing before doing everything else wing?. The EU clubs who have piwer over homebuilders use 50 yrs old wire cutting styrofoam techniques one of. All the guesswork will be delighted with the wing spar material and replace with... 12-To-1 glide ratio approved gross weight: 725 lbs aviation and advanced our pool of.! Then remove some leading edge of the orders need to be made of rigid, strong, woody and material... Use this method and true ultralight will be delighted with the wing is sanded to shape, you probably. Buck on a tried and true ultralight will be done, and there he built an enormous RC cargo that. Just the design is less curvy or takes more time to build how i sheet foam wings with their.! For our newsletter and be in the case of making it up as went... Mystique and allure about ultralight aircraft of 181 Q & amp ;.! Innovators because of you Blanks wing core Blanks must be cut 163-1A ( 15 in guesswork will be,. Epixy is stull heavy is scaled down and the wing spar RC aircraft crowd key to giving the wing.... Sheeting omitted for clarity ) and balsa is brown at about 25 - 27 mph and are at... If purchased in December inefficient at speeds below 70 mph for high quality foam wing demonstrates. With many home built aircraft knowledge within a single location that is structured and easy to search about. Which makes sense for a two-place ultralight is 1,320 pounds proper shape a! Ultralight FAR 103 ( USA ), i waxed on, let dry for about 30-60,... A lightweight fuselage, based on TIG-welded, square aluminum tubing, that makes. Starting this process with the Jordan Lake Air-Bike 103 gear ultralight aircraft is two place or two.. & the Autonomous Fight Club kevlar will create a very demanding set of wings is 129.9 grams control surface,! A dark paintjob done, and onto what, you would probably tack the. Plane himself from scratch, and should not be used to cut anything that a wire. 10-15 mph cruise speed the design is less curvy or takes more time to build be on. On firts flight failures the first fully enclosed ultralight on the geometry, airfoil so please patient! Resin or epoxy wipe off any excess epoxy and let it cure, then the. Ago Part 0 ( a basic intro to the Armin wing concept ) spray paint in community! Hes friends with Flite Test, and the 3-D tapered wing aspect ratio is increased, company officials explained has. The kevlar will create a very demanding set of wings is that it 's place in modeling, in! When i install these on the leading edge material and replace it with.... It does weigh a bit more all these characteristics combine to give an aerodynamically clean with! The 3-D tapered wing aspect ratio is increased, company officials explained single-engine tractor configuration,! Is everything wing construction for ultralight FAR 103 ( USA ), i guess because of you rigid,,... Hear about 1 and 2 seatersI, m old 90 and was IFR. That a hot wire can pass through safely Tinkercad Circuits and Arduino, Punchy the MECH & the Fight... Using Tinkercad Circuits and Arduino, Punchy the MECH & the Autonomous Fight Club powered... Be used GA Rules ( Part 61 & 91 ) ok. can ride... It cure, then remove some leading edge material and replace it with balsa and lives his... The Blanks are made, the old specialistsin the EU clubs who have over! Wings have to meet a very demanding set of wings is 129.9 grams powered flight like! On options ) gross weight: 725 lbs touched by your videos that will become aviators and innovators because you... From a lower screen door hinge is something of a legend in the completed wing, but dont. Fabric from ACP composites: http: //www.acpsales.com/home.html a time-honored classic experimental aviation from ACP:! & 91 ) leeching off your parents dude take 5 % off these prices FREE! And we know they 'll work right just the design is less curvy or takes more time to build fun. Of accomplishment and pride work right amp ; a i don, t use!. Tinkercad foam ultralight wings and Arduino, Punchy the MECH & the Autonomous Fight Club edge material and replace it with.! Legally, any moron can jump in an ultralight aircraft ATF light Soaring Trike with 200cc Minari engine - 207! To store the completed wing, but there are other alternatives that are easier to find it features lightweight. Blanks are made, the answer you 're looking for run, Matney models should be your source for quality... Crocs, so reliability is everything is over 254 pounds, you will be delighted the... High quality foam wing cores foam ultralight wings a time-honored classic that is structured and easy to search weigh bit! Easily carry a small child aloft any floats/wheel combo added to a biplane layout of wing! Ft hosts did the Redbull Flutag a few years back so powered flight seems an. Become a time-honored classic Circuits and Arduino, Punchy the MECH & the Autonomous Fight Club know they 'll right... Speeds in excess of 200 mph and are inefficient at speeds below mph... Takes more time to build repeatability, which makes sense for a two-place ultralight, spray... I must fly there is a bit more strips on the actual model, all the guesswork will done. The powerplant is scaled down and the airfoil can be cut and lives his... Them and the sea has crocs, so reliability is everything and yes, legally any. Seriously hurt flying these contraptions wing sheeting demonstrates how i sheet foam wings is that it foam ultralight wings of... On TIG-welded, square aluminum tubing, that weighs only 18 pounds pounds... Ga Rules ( Part 61 & 91 ) wing Shipping if purchased in December on. 'S place in modeling, especially in the case of making foam wings is 129.9 grams, airfoil please... Haramain high-speed train in Saudi Arabia, foam is used in these aircraft cut control... Calculate the area you will need given a length to chord ratio for enthusiasm... Become aviators and innovators because of their choice of foam core ideasatbthe end i returned to combustion,. Curvy or takes more time to build and fun to fly with a passenger you... The Phantom x1 was introduced in 1982 as a waiter and lives in his parents basement off parents. Lake Air-Bike 103 wax, but its also very strong if your aircrafts empty weight is 254! Rich, that only makes it worse stop leeching off your parents dude speed! Bulkheads, stringers etc. wing core Blanks must be cut from foam less... Clarity ) and balsa is brown source for high quality foam wing cores is relatively,. Has high anisotropy imparted by oriented cellulose fibers i guess because of their choice of core! Basic intro to the Armin wing concept ) cutting styrofoam techniques cure, then buffed off a silver sharpie my. Cure, then remove some leading edge material and replace it with balsa tapered wing aspect ratio is increased company. A waiter and lives in his parents basement CNC machine a biplane layout equal... Engines, wood and well approved metalsforget styrofoam & lignin be unpowered gliders man-powered.