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  1. AFAdrenaline

    Personal Design

    right, i was more thinking from an 'ease of construction' point of view. unfortunately i have very little experience w/ aluminum so i can't really provide any good advice... like i said previously... take your break and come back with a fresh point of view... things tend to work themselves out...
  2. AFAdrenaline

    Personal Design

    hey man, i'm sorry you ran into such a roadblock... don't give up though, i think (in my completely unqualified opinion) you have an awesome design going. maybe there are other ways around your solution... maybe lower you g-limits and thus a lighter structure? not to push composites again but...
  3. AFAdrenaline

    Personal Design

    well don't let me dissuade you from aluminum by any means... just as you said: we only have a limited view of the entire scope of your project as well as all the analysis. you're the only one who truly knows the intricacies and specific details of your design. i definitely think that a...
  4. AFAdrenaline

    Personal Design

    So i downloaded the software you recommended... where is the function to 'unwrap' the 3D components into 2D shapes? i'm still a little concerned b/c you're tryin to bend aluminum in 2 directions, i realize there are no sharp curves. that being said, you're bending it along the central axis to...
  5. AFAdrenaline

    Personal Design

    got it... looks good. just out'a curiosity what program are you using for your modeling that allows the output you posted? looks like on a rainy day you could probably put together a nice little cardstock model if you did that for all the surfaces. lol yeah, i gotta keep remembering, on my...
  6. AFAdrenaline

    Personal Design

    with regards to why it would be hard to bend aluminum in more than one direction... think of a piece of paper, very easy to bend in one direction, but now two to bend it along 2 different axis. from what i understand, aluminum sheeting will do the same thing without putting it in a hydraulic...
  7. AFAdrenaline

    Personal Design

    So you're 100% going a/ aluminum? i'd be a little concerned about getting it to follow the fuselage curvature without complex tooling. also in your analysis, the AoA went up between 87 and 120 knot... shouldn't it go down since your velocity is increasing? With regards to your prop/gearing/etc...
  8. AFAdrenaline

    Another concept to pick apart...

    gotcha, yeah duct design does present a variety of different obstacles and challenges. now your duct design was for a ducted fan powered by a piston engine correct? i'd imagine that you'd be having to deal w/ 3+ foot diameter tube into your design, whereas the outter diameter of these fan...
  9. AFAdrenaline

    Vtol design: 1 vs 6 engines

    so assuming a SFC in the .3 range we're talking only enough fuel for about 1 hr?
  10. AFAdrenaline

    Vtol design: 1 vs 6 engines

    you also need to take into account that when you loose an engine you're not going to loose thrust from that engine but also the symmetric one on the other side. for example if you number engines 1-6 in clockwise order, if engine 2 cuts out you will have to shut down or reduce thrust in engine...
  11. AFAdrenaline

    Vtol design: 1 vs 6 engines

    just throwing in my two cents here... obviously the more props you have the greater the chance of a mechanical failure... that being said a single rotor design means that a mechanical failure of a part would be critical. while traditionally the powerplant and the props have been connected in a...
  12. AFAdrenaline

    Another concept to pick apart...

    Gray Out? I don't get it?? stick around to see if what happens?? i'm definitely leaning towards internally mounted engines unless someone can point to a strong reason why i shouldn't. aside from moving the thrust line of each engine closer to the CG, if I'm picking up air through an intake in...
  13. AFAdrenaline

    Another concept to pick apart...

    Karoliina, i completely understand where you are coming from on this issue and you are absolutely right that the more speed you have the more dangerous things can be. although being below 61 knots is no guarantee that you won't die and likewise above is not an absolute guarantee that you will...
  14. AFAdrenaline

    Another concept to pick apart...

    jim, no apology needed... (not sure what i said to make you think i was coming down on you) but thanks for the support. as to everyone else i absolutely appreciate your input and concern. as a precaution: if any perceived sarcasm offended anyone... i apologize... just my nature. and please...
  15. AFAdrenaline

    Personal Design

    So there was a KC-135 dragging a flight F-16s across the pond. One of the Viper pilots decided to show off a bit in started doing some aileron rolls and such in front of the 135 exclaiming "see what i can do!" the 135 pilot replies "oh yeah, check this out..." and the 135 continues flying along...
  16. AFAdrenaline

    Another concept to pick apart...

    so what you're sayin is it might be a little much for a new pilot w/ 55 hours in a C-152?!? :roll: i'll admit i don't know off hand what the FAA requirements are in terms of but i'm not to worried since i'm rated for all the above... and like i said, i'm pretty much designing this plane b/c...
  17. AFAdrenaline

    Another concept to pick apart...

    orion, thx for the input on fuel tanks... looks like thats the way i'll end up going... exactly!! again, i do want to make it as safe as possible... but the fact of the matter is that i will primarily be the only one flying this aircraft. my background is flyin jets for the military so a 90...
  18. AFAdrenaline

    Another concept to pick apart...

    Karoliina you're just not gonna be happy until my stall is in the 60 knot range are you? :lick: I guess i'm not sure how you're relating operating engine out w/ stall speed. even in a cessna you can maintain a 100 knots of airspeed engine out given a sufficient nose down attitude. with the...
  19. AFAdrenaline

    Another concept to pick apart...

    lol, karoliina you really like that Wortmann airfoil don't you? The graph above is for the 3D wing (which w/ a relatively low AR i realize is not going to be as efficient), not the 2D airfoil itself. The Cd at L=0 is approx 0.004 and during cruise (which will only require a Cl of approx 1.8)...
  20. AFAdrenaline

    Another concept to pick apart...

    so back to my previous question... i'm thinking of going with something similar to the V-22 wing structure. I'm basically thinking of a structure similar to that used in a fuselage. I'd make the wing skin (blue) in a mold and then attach a series of longerons (red) in lieu of a main spar. a...
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