Jump to content

mak790

Members
  • Posts

    154
  • Joined

  • Last visited

Everything posted by mak790

  1. You'll decrease your ground clearance if you move your prop down, but of course there are also other things, you can find some answers here, but keep in mind it's only theoretical, hypothetical discussion at this point. http://www.homebuiltairplanes.com/forums/design-structures-cutting-edge-technology/5670-main-wing-position-question-4.html#post46192 Seb
  2. WOW another vivid discussion:) , there are no problems like that on the other aviation related forums like Homebuiltairplanes, vansairforce, biplaneforum etc, it's a pitty that some people don't realize that this type of discussion really repels people, not only from this page but also from canards, but it seems that some people don't care, not my business.
  3. mak790

    E-racer plans

    http://web.archive.org/web/20030721094700/www.eracer.org/builder_pages/eracer330/eracer330.html http://web.archive.org/web/20030410045442/http://www.eracer.org/ http://web.archive.org/web/20030625074224/www.eracer.org/builder_pages/index.html Seb
  4. Colin, I think that your first idea were much better, the problem in my opinion was that you were trying to make so many changes at once, new design new materials, etc. If I were you I would first design and build a new fuselage (molded, without autoclave it isn't really necessary for such a plane), I would also build moldless wings per Berkut specification (I've heard that you have Berkut plans and manuals), and in the next step I would eventualy try to build molded wings. You could build a really nice fuselage, I did a short sample for guys at HBA (attachments) it was only a sample and of course you can make a better one, (I raised up an engine about 7" like in the Stagger Ez). Please note it's only a sample and I'm not going to build it. Take care Seb btw renderings made in Solidworks
  5. Theoretically yes, but what a point? http://www.proxyaviation.com/media_photos.html#
  6. Wow I just checked my Long Ez plans, I haven't seen them for 6-8 months. I'm not into Long Ez any more. Seems that, there is only UNI in the wings, I'm wondering where is that 7725 come from, hmm
  7. Thanks Colin, I completely forgot, about 2-3 years ago there was a discussion at Canaraviation forum about the Berkut wings Layup, Richard Rilley said that fabric was laid at 30 and -30 deg, unfortunately he remowed all his post there, and because he passed away last December I can't ask him about it. I remeber that he said also, that the Berkut had 8 layers of fabric in the shear web, not 6 like the Long Ez. That's all what I remember. Seb
  8. I know they don't/didn't use 7725, but I thought that they replaced glass BID 7725 with Carbon BID 282. So I understand they used 3 layers of UNI, first at 45deg, second at 0deg, and third at -45deg. Do you remember exact order?
  9. Isn't it carbon uni fibre? Not prepreg.http://www.hexcel.com/www.hexcel.com/Fabrics_DataSheets/716.pdf http://www.aircraftspruce.com/catalog/cmpages/unicarbongraphite.php I've heard about 3 carbon BID layers insted of two 7725. What did they use in place of the 7725? Was it 282 or 284?
  10. mak790

    Chudzik CC-02

    I remember about Cirrus, actually was one more similar design, French Orion 801 http://oriong801.free.fr/gallery-26718.htm There is one common thing for all these desgins, all of them failed sooner or later. Seb
  11. mak790

    Chudzik CC-02

    Not bad but it isn't an original idea, that plane is similar to Prescott Pusher, Pushy Cat, and few oters. And it isn't real canard it has h-stab. Anyway thanks for link. Seb
  12. TMann if you are looking for something like "homemade oven" try these links Extremely simple and cheap http://www.privatedata.com/byb/rocketry/composites/ovens/Airframe%20Composite%20Curing%20and%20Post%20Curing%20Oven.html http://www.jrockdale.com/curing_oven.htm This one is really nice and big but is also $$$. http://www.dpcars.net/dp1v8/db.htm Seb
  13. Could you give a link to that forum? Seb
  14. Isn't it also about glass, resin ratio? Seb
  15. Yes but you have to multiply it by 2.0, which means 16G ultimate not 12G. Anyway it seems that only Burt knows real numbers. Here is a good example of the Boeing 777 wing load test, it broke at 1.54 so it means 0.04 above what was required, incredible.http://www.youtube.com/watch?v=pe9PVaFGl3o Seb
  16. Don't worry I won't. Seb
  17. Two questions:What is a definition of "very impressive"?, and second question who built those wings and canard? average builder or some professionalists. Seb
  18. Marc, I was wondering where is that 5G's comming from (was it only example?), I've never seen any official source of G load for Long Ez, but some people claims that G load for Long ez is about (I've seen different opinion) 11-12G. I understand that they were rather talking about ultimate G load, so if you divide it by safty factor for composite structures 2.0 (1.5 for metal planes) you will get about 5.5-6G. One thing is clear these planes aren't as strong as some people might think. http://www.cozybuilders.org/Canard_Pusher/RAF_LE-Structural-Test.pdf Seb
  19. Don't remember exactly but a few years ago there was something like 6$ grand, expect something like 5-12$, you also need to know that there is no Cosmos in basic version so you won't be able to make any FEA analysis. So I would say go for Rhino. Rhino doesn't have library of parts (toolbox) like Solidworks or other engneering softwares, but there is not many standardized parts in a Cozy. You don't get any shock until you won't ask about Catia prices, I've heard many stories, the price for 3 modules is if I remember correctly 30.000.00$ and there are about 40-50 modules (maybe even more like 60-80) in a full version Catia P3. Marc should knows better they use Catia at Scaled. Chris,The price is 368$. here is a direct link http://www.comsol.ch/content.php?si=317&id=58&language=en& I had same opinion like you about Rhino, but I'm changing my mind, why? Check out that link which I gave in CAD drawings thread for more info (special for Orion responses). We have Rhino at Uni among softwares like Solidworks/Edge, Ideas, Catia, Femap, Abaqus etc, students usually use it for making complex surface models for flow analysis. Yes you can export it into Solidworks but i don't remember in which format, probably parasolid. Many people create complex shapes in Rhino next they export these files into softwares like, Cosmos/M, Femap etc, for Fea,CFD analysis. Seb
  20. I understand what you mean, of course there is a function of sets up during creating parts, making assemblies, etc , I probably use wrong words I meant that usually Y-axis goes up (like in Solidworks pic1 and Femap pic2 for example), and in Catia pic3 for example Z-axis goes up, but of course it doesn't mean anything, it's up to how you are going to set it up. Thanks Seb btw I took that Catia screen from the internet, because there is no demo/student version of Catia so I don't have that program at home.
  21. Chris, Are we talking about same software ? Raymer RDS is available for about 100$ for students, and probably for non commercial usage also, but personally I was disappointed with it (I was expecting more modern menu, it's very similar to DOS), it's hard to work with it. Btw have you heard about Airplane PDQ? it's a very basic software you can download demo version at their webpage, here http://www.davincitechnologies.com/AirplanePDQDemo.htm There are also others programs, much more professional such as ADS - Aircraft Design Software, or J2 Aircraft Dynamics, direct links for it and some descriptions here http://www.homebuiltairplanes.com/forums/design-structures-cutting-edge-technology/4919-computer-analysis-those-designing-aircraft.html Seb
  22. Steven Check this out, here is a long thread about different type of programs which you can use in design process, some examples, links, prices, availability for no commercial and commercial usage, etc. http://www.homebuiltairplanes.com/forums/design-structures-cutting-edge-technology/5025-what-software-do-you-use.html Marc is that a common practice for companies such Boeing, Airbus etc , I've never heard about it (but I have much more common with Mechanical rather than Aeronautical Engineering), the only program which I know with similar type of coordinates system is Catia, all others like Solidworks, Inventor, Femap etc use "standard system" of course you can change it. Seb
  23. It seems that everybody uses Raymer's books special the thicker one "Aircraft Design: A Conceptual Approach" , do you also use his RDS program? Seb
  24. If I remeber correctly that price was for cheap tooling, destined rather for room temperature wet layup. But there is no difference 200, 600 or 1200$ like you said, it's just too expensive for an individual project, unless you have "free" access to materials, etc. Seb
×
×
  • Create New...

Important Information