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aerodynamics

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  1. C

    Shark Skin Wrap

    https://fly.omeclk.com/portal/wts/uc%5EcnFmf7jaqwf%7CcnNzLj-%5EQ4sazfXLQ%5Es82Yno Any comments on the aerodynamics of this? Can small/slower aircraft benefit from something similar?
  2. Marc Zeitlin

    I've gone soft - need help on some aero

    I need some guidance on an aerodynamic calculation (and not a particularly complex one, but I'm still flummoxed). I'm actually looking for the math to use here - not handwaving or qualitative arguments - I need the actual quantification :-). Here's the question. Assume I have two airplanes -...
  3. TomCassuttGrandson

    Cassutt's Conversion Factors - Quick Reference

    Happy Friday to Everbody! Here is a short but helpful Quick Reference document from my Grandfather Tom Cassutt's personal aircraft design archives that he used a lot during his lifetime. It's covers most commonly used Conversion Factors It seems to have some good information that could be a...
  4. TomCassuttGrandson

    Tom Cassutt's Unreleased Cassutt 111M & 11M Racer Plane Design Files

    Hello Everbody! Here are some unreleased design files, notes, blueprint drawings, data, etc. from my Grandfather Tom Cassutt from his personal archives related to his Cassutt 111M and Cassutt 11M Racing Pylon planes. Tom went back and updated these files even until the early 2000's, so I...
  5. A

    Understanding Induced Drag

    I'm trying to understand the drag and thrust curves of the plane I'm building. Profile/form drag - no problem. My sticking point right now is induced drag. All of the graphics on the topic show induced drag decreasing rapidly with increasing speed. But the equations I find on the subject, as...
  6. A

    Part 103 low speed ultralight glider design (wing)

    I need ideas of wing system for ultralight glider (such as Chanute, EasyRiser or Primary Instruction Glider) (may be biplane) low speed (25 - 40 hm/h) , weight of glider < 40 kg). My idea is next: biplane (wingspan - 6m, wing chord - 1.2m), S1210 airfoill...
  7. L

    What would be a reasonable CLmax estimate for the USA35A thick, high-lift airfoil?

    Hi, I'm trying to choose airfoils and establish wing dimensions (and high lift devices if needed) for my design. I have a low stall speed requirement (Vs0 = 42km/h [with flaps]), so I'm looking into high-lift airfoils with good stall and thick enough for a light spar. I'm trying to balance CLmax...
  8. T

    small rocket powered glider(wingspan < 3')...HELP

    hello! I am working on a small glider that will be propelled by either a B6-4 or C6-5 Estes solid rocket motor; I am writing a python script that will(hopefully) model the flight path on a 2D plane. Right now the software accounts for everything except the following aspect, and that is if we...
  9. G

    Wing In Ground Effect Craft Design

    I would like to discuss the different aerodynamic designs of wig craft. Any insight or information would be greatly appreciated. To get the conversation started I am interested in a longer range craft powered by twin engines, either Chevrolet motors or aircraft motors. A craft that is similar to...
  10. B

    Calculating or estimating forces on control surfaces

    How does one either estimate or calculate the load on control surfaces? I see examples on calculating the loads under various flight conditions like roll and pulling out of a dive, but if I wanted to calculate the load on say an aileron hinge, I'm lost.
  11. A

    MIT course: Introduction to Aerodynamics

    This course might be of interest to some on this forum: https://www.edx.org/course/introduction-aerodynamics-mitx-16-101x-0 Starts August 31, 2015 Length: 16 weeks Effort: 12 hours/week About this course This aerodynamics course focuses on the study of the flow of air about a...
  12. proppastie

    Basic Aerodynamics Question Total Drag from Glide Polar

    Picking through my second reading of Hiscock and trying to sub my numbers (no surprise) I have problems. His data for the Dox is RN=10,000,000 and my calculations show my bird has RN=1,000,000. (row 7) I am trying to calculate the total drag for HP required in climb at best L/D along with...
  13. proppastie

    Abbott Aerospace Inc. Spreadsheets

    lots of interesting stuff. Hope they do not remove it. Spreadsheets | Abbott Aerospace Inc.
  14. H

    Is there a gap in ARs ?

    I could be wrong but there seems to be a gap in AR between the ultralow AR planes 1-2 ( Arup , Wingless ) and the bottem of the conventional planes 4.5 ( Cusset special ). Does the gap exist ? What "mission " could the "very low " 2.5-4 AR planes forfill ?
  15. H

    boxed in sesquiplane twin - possible improved deflection of propeller slipstream

    I have been toying with the idea of a boxed in sesquiplane twin , with junkers flaps on both wings and spoilers on main wing outer panels . I hope to gain improved low speed roll controll , lighter spar on main wing , and possibly less penelty from having the wings close togther (half cord...
  16. proppastie

    Basic Aerodynamics Question

    Looking at Gottingen 535 airfoil data: There is data point for C.P. (Center of pressure?) at 92% of chord from leading edge at -6 deg, and the C.P. curve is extended to -150% of chord from leading edge. So how is the center of pressure not on the wing, off in space so to speak, or what does...
  17. A

    Research into increasing lift without increasing wing dimensions?

    Is anyone aware of any research into increasing lift without increasing wing dimensions? I am thinking maybe along the line of micro-structures and other tricks in material types. There might not be any, but I thought I would see if anyone has come across any interesting tidbits.
  18. H

    "slowdown" or "blockage" in prop design

    I have been a heretic on this subject for quite a while. Most prop designers compensate for "slowdown" of the inbound stream resulting from the body behind the tractor prop (prop in front of cowl). I think that this is very poorly understood and that the designers are missing a lot. This post...
  19. proppastie

    USNTPS-FTM-NO. 108 (PRELIMINARY) FIXED WING PERFORMANCE

    While working and researching for my quest/paper airplane I found this. Lots of stuff. http://www.vmihosting.com/MWS/Documents/USNTPS_FTM_108.pdf
  20. T

    What exactly makes a plane be STOL?

    I'm impressed. Watching YouTube videos of people in a Zenith or Highlander taking off in what looks like 45 feet. Awesome. I realize some of it is head wind. But what else has impact on fast climb rate? Reading posts like this one makes me realize how utterly uninformed I still am. Sigh...
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