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  1. Mac790

    The new BMW "Baby Six" diesel engine.

    The BMW introduced a new 3 cylinder, 1.5l all aluminum diesel engine. Is it the enigne that some of us have been waiting for? links Meet The New "Baby-Six" New BMW 3 Cylinder Turbo Petrol and Diesel Engines Detailed - BMW 3-Series (E90 E92) Forum - E90Post.com Seb
  2. Mac790

    CAD Software Recommendations

    Take a look at Creo Elements/Pro previously known as Pro/E You can buy it, even if you are not a student. From their site Price 299$ here Seb
  3. Mac790

    Velocity continues it's twin canard development

    Seems that you guys took this apples vs oranges part too seriously. Just to finish it, last sentence in relation to it. There are some similarities between apples and oranges, but there are also differences, I see probably more differences between those two airframes (retract vs fixed, etc) than...
  4. Mac790

    The big video topic

    Seb
  5. Mac790

    reduction drive with prop extension

    hmm Like I said I took it from 2/3 years old thread, maybe not the best example, but someone probably could find a better one. Anyway thanks for the link. Seb
  6. Mac790

    Homebuilt Fuel Tank ("Cell") Design and Fabrication

    It's not as crazy as it might seems:), have you seen this thread Bullet Holes Do you have any paper on it? I've seen something contrary to that. source http://isjd.pdii.lipi.go.id/admin/jurnal/32109714_0126-1533.pdf I have more papers that claims same. Seb
  7. Mac790

    Velocity continues it's twin canard development

    :gig: I think that you could call now, to all those engines/airplanes producers, and tell them that they shouldn't give any specification for sea level (power, climb rate, speed, etc), because nobody beside people in Holland flies so low. But because you have PHD in AE (and I assume that you...
  8. Mac790

    Glider/ Ultra-Light personal Jet Aircraft DESIGN - Suggestions and help please!

    Hahahh so true.:) I gave you like for it. Bearcat, the best idea for you is probably to make a table similar to those guys above. In the first row put requirements for your airfoil, next test some foils, just for comparison two flapped FX79, AH 93, one or two NACA 6x-xxx series, next some...
  9. Mac790

    Homebuilt Fuel Tank ("Cell") Design and Fabrication

    Ok, my last response to this topic. Just few things. First, when I asked about size of your fuel tank, it wasn't actually only about crash safety issue (as it's not problem at all, if designed correctly) I don't know how many changes do you want to do compared to the original design. But for...
  10. Mac790

    Velocity continues it's twin canard development

    Of course those numbers don't make sense. Same as comparing apples to oranges don't make sense either. There are some similarities between those planes (like between apple and orange), but there are more differences. First, Defiant is fixed gear airplane, Velocity retract gear one, if someone...
  11. Mac790

    What are epoxy fumes made of?

    Personally I always wear proper equipment, even if resin producers "claim" that it's not required. Here you touched the biggest issue. It seems that you know, what you are talking about. People talks about some fumes (use proper respiratory system, proper ventilation, and infusion ideally)...
  12. Mac790

    The big video topic

    Early "flights" compilation. Seb
  13. Mac790

    Homebuilt Fuel Tank ("Cell") Design and Fabrication

    re: Homebuilt Fuel Tank ("Cell") Design and Fabrication Wow, Jarno I didn't know that you weight over 200kg (E-racer has Lycoming 0-540) :gig: but seriously, like I said in context of fuel cells, attach (design) it properly. They (E-racer designers) didn't, and this is what happend. There is...
  14. Mac790

    Velocity continues it's twin canard development

    The idea about using two engines in such configuration for canards isn't new. There was one Long Eze modified this way, but from what I remember it didn't work for Long Eze, and it was later rebuild to previous configuration. Wouldn't be better to use push-pull configuration simialr to the...
  15. Mac790

    Glider/ Ultra-Light personal Jet Aircraft DESIGN - Suggestions and help please!

    Ok, I took a look at that paper and it seems that they de-cambered NLF foil (de-cambered 215 is really similar in shape to the NACA 6x-xxx, so it mislead me). The problem is that you don't know, did they make any other changes, beside it. If you start palying with it you might be in same...
  16. Mac790

    Homebuilt Fuel Tank ("Cell") Design and Fabrication

    re: Homebuilt Fuel Tank ("Cell") Design and Fabrication I was wondering, are going to build an airplane from a kit, or do you think about a "custom" design. If you are going to design it from scratch, you could design it with fuel in the wings, and eventually put a small fuel cell in the...
  17. Mac790

    Glider/ Ultra-Light personal Jet Aircraft DESIGN - Suggestions and help please!

    Yes both FX 79 and AH 93 are flapped sections. I was looking at renderings of that jet glider posted a couple pages before, and I would hazard to say, that it has also NACA 6x-xxx series on it. Take a look at airfoil shape and compare it with NACA plots eventually FX series but it's probably...
  18. Mac790

    Interesting Aircraft

    Thanks guys for info, I really couldn't find name for it. Seb
  19. Mac790

    Glider/ Ultra-Light personal Jet Aircraft DESIGN - Suggestions and help please!

    Sorry for confusion, I'll try to clarify it. First we should vary a conventinal glider, from a aerobatic jet glider. For the conventional gliders at the beggining (I'm not talking here about "Flintstone" era gliders) they we using NACA 6x-xxx series airfoils, next they replaced NACA foils...
  20. Mac790

    Interesting Aircraft

    This one is the weirdest one, but unfortunatelly everything what I have are those two pics, don't remember the name, can't even tell is it real or fake one. Seb
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