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  1. WK95

    Hoerner wing tip geometry?

    Hey there everyone, I'm needing to model some Hoerner wingtips in CAD. Thing is, while I have an idea of how the wing tip looks like, I have no clue how to accurately model one. Any pointers on where I can get geometrical information on the wingtip?
  2. WK95

    Wet trimming carbon fiber prior to full curing

    So various places including the Rutan manuals say that one can "wet trim" fiber glass around 4 hours into the curing prior to it being fully cured. Can the same thing be attempted with carbon fiber? If possible, this would be ideal since cutting cured carbon fiber is a messy and potentially...
  3. WK95

    Opinions on my UAV Wing Structure

    Wing Structure Legend: Orange-Shear Web Light Blue - Outboard Spar Tube Dark Blue - Inboard Spar Tube Yellow - Ribs Translucent Orange - Wing Module Skin The wing has no taper with a constant airfoil section throughout. The wing span is 9.8ft wide with an aspect ratio of 12. The wing consists...
  4. WK95

    Maximum practical hand-layup laminate thickness

    What is the thickest laminate that can be properly hand-layuped? My concern is that too thick a laminate and the resin might not penetrate all the way through to the bottom laminates. The use of a vacuum bag following hand layup may improve the resin distribution and possibly force some resin...
  5. WK95

    Wing sizing - Ignore wing area inside fuselage?

    During the aircraft sizing process, when using wing loading, should I include or ignore the area of the wing that is covered by the fuselage? For various aircraft from the manufacturer's website, there is disagreement on the standard method of measuring wing area in that some sites use...
  6. WK95

    Non-ferrous fasteners for use in composite aircraft.

    For carbon fiber aircraft, have non-ferrous fasteners ever been used for both structural and non-structural applications? After seeing this article, I figured that there might be great potential for my purposes (a 30 lb UAV). But for aircraft applications, I'm not aware of any aircraft...
  7. WK95

    No-oven, no-autoclave manufacture of composites with 350degF performance

    No-Oven, No-Autoclave Composite Processing - Rapid fabrication of large, single-piece composite structures "The individual elements are not unusual, but they are combined in such a way that enables proper management of the heat generated by the epoxy resin during cure." This is seems...
  8. WK95

    Glider: Manufacturing multiple wing sections by cutting full skin into sections

    https://youtu.be/I_atJwXxcrU?t=216 Can someone tell me the glider model? I want to find some other pictures of the inboard and outboard wing sections at the location of the cut. As shown in the video above from a "How its made for a glider", the skin is manufacturing in top and bottom...
  9. WK95

    Selection of epoxies for a new design?

    The following is a list of the various epoxy resins and some associated comments on them. West Systems 105 resin + 206 hardener - Low viscosity for vacuum bagging. The slow hardener lets the vacuum bagging process have the time to work to distribute and squeeze out excess resin. I think this is...
  10. WK95

    Thickening airfoils (specifically E214)?

    I'm not too keen on the idea of messy around with airfoil geometry without some sort of testing but for my purposes, the E214 airfoil for low reynolds number flight (Re=400,000) is a bit too thin. I'd like to add a bit of bulk to it to achieve 15% thickness or maybe a little bit less if I can...
  11. WK95

    Methods to find plug centerline, and forming parting flanges for access panels

    Can anyone give me some advice about creating the parting flanges on a plug to make the two mold halves? My concern is that if if the flange is placed just a little bit too much one side, it make result in a mold that slightly wraps around the plug and therefore impossible to separate. One...
  12. WK95

    Lost foam method with vacuum bagging.

    For the smaller parts that needs to be hollow such as air intakes, I'd like to try using the lost foam method to get a single piece as well as vacuum bagging to help with the outer surface finish. Does anyone have any experience with this? I've seen on an RC airplane forums that one person who...
  13. WK95

    Composite parts with premolded flanges?

    So how would someone make something like that? Basically, most of the components in the Lancair have flanges built in so assembly is basically aligning the parts then bonding them together. Very fast method of assembly for the end builder compared to making your own fillet joints (which...
  14. WK95

    Single spar wing - Resisting drag load; mounting ailerons

    Arion Lightning, Experimental, Lycoming 0 320, Aircraft project : On this Arion Lightning for example, there is only one spar and attaching the spar top the fuselage is done at two points along the spar. In such a configuration, how is drag loads handled? Not entirely clear but I'm...
  15. WK95

    Locating the C.G. relative to wing aeroydnamic center?

    Assuming for an aerodynamic center at 25% of the MAC and a conventional aircraft, a common starting point for the C.G. range is between 25% and 32% of the MAC. This means that since the center of lift is in front of the CG and generating lift, the tail must also generate upwards lift to resist...
  16. WK95

    Budget plane: Fisher Youngster, Classic, or Ragwing Special?

    So this college student has decided that he wants to build a plane. I'm going to be financing this project myself so I'm looking to build the lowest cost possibke airplane. Between the planes listed above and possibly some I've missed, which Have a active builder community? Beginner...
  17. WK95

    Composite joggle geometry?

    Using the above, can someone offer some guidelines for composite joggle geometry? Joggle depth is easy enough. The joggle on one mold half should have a depth matching the thickness of the laminate on the other half. What about return length? Numbers appreciated. I ask because I'm working on...
  18. WK95

    Great Plains 2176 VW Continuous and cruise power? fuel consumption?

    Their website (Great Plains Aircraft Supply Co.,Front Drive Engine Specifications) shows that for the 2176cc 80 hp front drive engine, the maximum power output is 80 hp at 3600 rpm. The continuous power is shown to be 76 hp at 3400 hp. That's not much difference. At 75% power (the usual value...
  19. WK95

    Corvair service cieling?

    What is the service ceiling of a FlyCorvair or similar conversion engine?
  20. WK95

    Formula One Continental O-200 carburator air intake

    Regularly, I see Continental and Lycoming engines have a carburetor air intake shaped like this one below. However, in the above picture, the air intake is just a metal tube bent 90 degrees. What's the deal with that? Doesn't it need a filter especially if its racing at Reno what with all the...
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