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  1. M

    Most Beautiful Aircraft Ever Built

    The Skyblazer was built by my old boss, Chuck Harrison. He is co owner of Composites Universal Group and has had his hands deep in the ViperJet, Giles 200,MX-2,anything you could think of. He built it from an old Rutan Solirare fuselage that was going to the dump. Hot wired foam surfaces and a...
  2. M

    BRS design questions.

    Does anybody know the design requirements for a BRS chute. I read that the main attach point needs to be above and in front of the CG,How much? I am also assuming that you need at least 3 but preferably 4 attach points(is there a standard). I also assume that the chute needs to be at the CG...
  3. M

    carbon foam wing

    I used pre preg uni tape, 265 deg cure. I observe the industry standard 2x safety factor in general. Can you give me some reasonable assumption of the percentage below spec I can expect on these laminates? There are many variables and assumptions here but ultimately weight dictates...
  4. M

    carbon foam wing

    I believe the spar is just under 10 lbs, it is made of pre preg carbon with .25" web,core, each half is 14'. C channel. These are pretty standard aircraft construction with the caps being uni-directional carbon fiber. There's about 1in^2 at root, spec on that carbon is 202 KSI in...
  5. M

    carbon foam wing

    Wing area 50 ft^2 Span 28ft Gross weight: 500# Airfoil 18% thick Taper ratio : .7 Does anybody have any input regarding the vaibility of a wing with the following; Removable, solid foam core, sandwiched with 3 ply carbon fiber @45 deg for the skins, substantial root and tip ribs, c-channel aft...
  6. M

    Foam and aluminum wing?

    Does anyone have any data regarding the difference in weight between a carbon fiber skin and an aluminum one of comparable strength. I currently looking at using 3 ply pre-cured carbon fiber over full foam core but I think aluminum would save me lots of finish time. Any thoughts on one versus...
  7. M

    Foam and aluminum wing?

    I am familiar with the method of the Cri-Cri and HP-18 but I am more interested in using a full foam core, not foam ribs. Anyone done that? I tend to agree with hot wings, even if you had a perfect bond, you could easily rip the piece of aluminum off the foam, leaving only the aluminum, glue...
  8. M

    Foam and aluminum wing?

    Has anyone done a solid blue foam core wing(Rutanesque) bonded to an aluminum skin with maybe aluminum spars? I think that this would be very easy, hardly any finish work, cheap, strong, etc. Any thoughts or suggestions about how this might be successfully done?
  9. M

    More Spar Details

    Designers sometimes bevel the web core at the caps in order to facilitate vacuum bag compaction of the caps in the 1/4"-1/2" that the web core occupies. For instance, if we are doing a c channel with a 1" cap and no bevel,then 25% (the 1/4" thickness of the web core) of that cap would not...
  10. M

    Introducing the Aerowerx Oneoff

    Sorry, search "swift motorglider" should give you an idea of how far back the occupants and engine have to be in a swept flying wing configuration.
  11. M

    Introducing the Aerowerx Oneoff

    I think you'll find that your center of gravity will be too far forward, take a look at the Arienne, see how far back the pilot must be. Build a simple foam glider, it will tell you a lot.
  12. M

    Need Ultra light plans suitable for an 18 hp 125lb thrust motor I have

    Check out the Sky Pup, one of my favorites and designed for low power.
  13. M

    My 2nd plane design

    I am also very interested in this configuration and think it has the most potential in terms of unusual configurations. I built a R/C model to test and was pleased with the results. The main difference being that this was a single engine out the back. It flew well with a higher than average...
  14. M

    Does anyone know how to import a Solidworks file into x plane? I want to fly my plane

    Hi, I would like to get my plane into Xplane and evaluate it. I have spent a little time trying to figure this program out but like all programs, this has a curve and I just don't have the time to figure it out properly. My design is modeled is Solidworks and I would really like to see what I...
  15. M

    Cutting inspection panels in composite fuselage?

    If I understand you correctly, I would have to do some edge finish work, I suppose that your method would probably yield a nicer edge, the reason we do it this way is so we don't have to do 2 oven runs.
  16. M

    Why do the Long-EZ and Varieze have anhedral in the main wings?

    Why do the Long-EZ and Varieze have anhedral in the main wings?
  17. M

    Building a semi human powered flying device

    It's at least interesting to watch, it looks like he got higher off the ground than if he just ran and jumped.
  18. M

    Cutting inspection panels in composite fuselage?

    Hi, If you are using prepreg you simply cut the plies for the door to size, locate it, tape "clear tape" over it to prevent the skin from bonding to the door, and layup the rest of the skin. What you get is a door that fits exactly with a nice flange. This is essentially the same as the other...
  19. M

    Angle of attack question

    Can you elaborate on the difference between aerodynamic and geometric twist, I always assumed that they were one in the same, that is that the geometric twist caused aerodynamic twist. I recall a Sport Aviation article that was very much for geometric? twist citing not only the tip stall...
  20. M

    Home depot air plane !

    It looks like the aft spar is MDF!
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