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  1. Othman

    Discussion on Safety Factors for Composites Design and Testing

    Hello everyone, it’s been a while since I’ve posted anything on the forum, although I have been popping in once in a while for a quick read of the interesting things going on. I’ve been meaning to write this post for some time now as it’s quite an important subject and I haven’t seen it...
  2. Othman

    Tip for economical designing

    If you're designing your own aircraft, then you probably have an aircraft spruce catalog (or similar) to look up available/common materials, dimensions, and costs. While doing this, I noticed that there is little consistancy with material pricing (reference Aircraft Spruce and Wick's Aircraft...
  3. Othman

    Wing skin to spar connection

    I need a sanity check on wing skin to spar interface, so I'm looking for some second opinions. The attached figure shows the upper end of a cross-section of the main spar at the wing root. The spar is built-up from a thin web with aluminum bar chords (caps) on either side of the web. Since it...
  4. Othman

    Single-slotted flap design

    Does anyone know of any references that show how to properly design a single slotted flap? I'm looking for information on flap LE shapes and gap dimensions. I found NACA/NASA reports for fowler flaps, but even then the flaps were positioned in arbitray locations and aerodynamic measurements...
  5. Othman

    BD-5 just went down

    Very tragic! A BD-5 scheduled to fly in the local airshow tomorrow just went down at Carp Airport. See the following links. http://www.cbc.ca/story/canada/national/2006/06/16/plane-crash.html http://www.microjetcanada.com/
  6. Othman

    AirVenture 2006

    Anyone going this year? So far it looks like I will be there. It would be great to meet some of you in person... I will be easy to find since I will have fixed coordinates most of the time (representing my workplace in the trade show).
  7. Othman

    Homebuilt metal forming tools

    Hello everyone, I was wondering if anyone has any good "home brew" solutions for bending sheet metal without buying an expensive brake... especially for dealing with long pieces for wings and fuselages. I would like to come up with some inexpensive design that can be built with simple...
  8. Othman

    Wing Skin Lap Joints

    I once worked with a designer (also a phd in aerodynamics) who told me that lower drag would be achieved if the aft wing skin overlapped the leading edge skin, rather than the other way around. The reason being that the forward-facing ridge would cause a local region of high pressure, thus...
  9. Othman

    Latex paint on fabric covering

    Hello eveyone, I found this article on the Bowers Flybaby website, thought it was pretty interesting. Does anyone have any experience with using latex paint on fabric? What are your opinions on this application? http://www.bowersflybaby.com/tech/latex.html
  10. Othman

    Rhino 3D - Results

    Well I've been playing around with this software, and I must admit that I like the user friendlinessness of the product. It's quite easy to use and you can obtain some pretty good results without a lot of sweat. Here are some pics of my flying boat model... I still don't see myself...
  11. Othman

    CH601 Builder's log

    For anyone building, or thinking of building a CH601, I found this great builder's log on the web: http://lancegingell.com/planebuild/constructionlog.asp Very detailed and lots of good quality photos. Enjoy
  12. Othman

    Wind Screens

    Hello everyone, For those of you with open cockpit experience, I would like to ask for your opinion on either of the two suggested wind screen designs bellow. A) is similar to what would be used if a full canopy would be installed, B) is a short, concave design intended to deflect the...
  13. Othman

    Speaking of flying boats...

    Check this video out... really cool http://www.putfile.com/media.php?n=HydroFoam
  14. Othman

    google maps satellite images

    Hello everyone, If you haven't seen this yet, you should check it out. Google maps now has satellite images of the world, and allows you to zoom in quite close (on most places). www.maps.google.com type in the name of the city you want to see... then select the "satellite" link on the...
  15. Othman

    My Flying Boat

    Hello everyone, I just wanted to share a sketch of my ultralight (Canadian rules) flying boat design. It doesn't use any sophisticated means to get off the water (it's pretty traditional in that way). I wanted to design something small and fun to fly. For reference, the wing span is 24ft...
  16. Othman

    Air Transat A310 Loss of Rudder

    For those of you who didn't hear about this, I wrote a brief description of the incident below. Some nice photos are available at the link below. http://www.acpa.ca/photo_accidents.htm This will have an impact on the image of composite structures, and may also impact sales of the new...
  17. Othman

    MZ202 Ultralight Engine

    Does anyone have any experience, or heard anything about the MZ202 60HP ultralight engine? You can see it on the link below: http://www.compactradialengines.com/engines.html Thanks
  18. Othman

    Static Displacement Calculator

    Hello fellow seaplane enthusiasts, Just wanted to present my first "show and tell¨ in this forum :) I'm making progress on programming a "Static Displacement Calculator for Flying Boat Hulls", or for pontoon floats. The intent of this program is to determine the equilibrium/trimmed draft...
  19. Othman

    Question about Belt/Chain drive systems

    Hello everyone. I am looking for some pros and cons about belt drives and/or chain drives for a prop shaft that is offset from the engine shaft by approximately 1 to 2 ft. Keep in mind this is for low horsepower use (<80hp). A nice wide belt seems like a good approach to me, kind of like...
  20. Othman

    Flying Dutchman - a great read

    Hello everyone, I picked up a copy of Anthony Fokker’s autobiography (designer of the famous German WWI aircraft) from the library at work, and after reading the first couple pages I couldn’t put it down (I’m not know to read books for entertainment). In his book, Mr. Fokker describes...
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