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  1. Z

    Cutting out airframe tubes - whats the best saw blades?

    I am weary to use a cutoff wheel, one slip or cut too close and another tube needs replacing. I will have to use a grinder with a flapper to finish off the excess. I came across these blades and they look like that would do the trick: http://www.diablotools.com/products/product/DS0908CF I...
  2. Z

    Cutting out airframe tubes - whats the best saw blades?

    It's been a a while since I've been back here. I've been planning modifications to my airframe. I have to cut out some of the 5/8" 4130 tubes for the modifications. I had already cut a few 3/3" tubes with a hacksaw and this took forever and wore the blades out very fast. I would like to know...
  3. Z

    BMW R1200 motorcycle engine

    I'm in Osoyoos. We have a nice airstrip, but no hangers. There was a guy from there who was here with a trike with a BMW a few years ago. He has a video on YouTube. https://www.youtube.com/watch?v=uexOm2C4udE
  4. Z

    BMW R1200 motorcycle engine

    I am very interested in more information about these engines since I am considering one engine for my plane. I need as much information as possible and as Brillo mentioned Yahoo groups has become a disaster since someone thought their redesign website was a good idea...in fact a Yahoo group I...
  5. Z

    BMW R1200 motorcycle engine

    I've been looking for external dimensions for the BMW R1200GS air/oil cooled engine, but I cannot seem to find them anywhere. If any of you run one of these engines I would appreciate the measurements as follows: Bottom to top without alternator and with alternator (without fairing). Bottom to...
  6. Z

    Flaps on a Super Cub - Why a gap strip?

    BirdMan100, After seeing your drawing I decided to redraw the whole after spar section. I moved the top rear of the wing back to be able to make a better S curve and I shortened the cord of flap after reviewing the size of the real Super Cup flap and since my flap span is longer there is room...
  7. Z

    Flaps on a Super Cub - Why a gap strip?

    From what I can tell though, this is how the super cub is set up. I can't tell for sure if the flap leading edge creates a funnel but in retracted position there is not much space. The aileron on the Super Cub is almost the same as the flap shape and the hinge is slightly higher and is a frise...
  8. Z

    Flaps on a Super Cub - Why a gap strip?

    Birdman100, Thank you for the information. I tried to insert an image, but it would not show options to my hard drive or let me drag and drop an image into the box. Here is a link to the screenshot: Screenshot by Lightshot I have drawn this out in QuickCAD which allows me to pivot the flap on...
  9. Z

    Flaps on a Super Cub - Why a gap strip?

    The PA-12 came out in 1946 and had a well designed rear wing and flaps from what I can see. The PA-18 didn't come out until 1950, so they had a few years to develope a good flap plus there was a few variants of the Super Cub line starting with the 90hp engine which had no flaps. After the horse...
  10. Z

    Flaps on a Super Cub - Why a gap strip?

    It appears the PA-12 with it's smooth S shape does not need the gap strip, but I have noticed some have wing fences. With all the differences of the PA-18 Super Cubs and variants with smooth S shape to sharp C and even a double slotted flat example, they all seem have the gap strip in common...
  11. Z

    Flaps on a Super Cub - Why a gap strip?

    The Cessnas appear to have a long curved cove at the rear of the wind even though the transition from the bottom of the wing is sharp, it must help with airflow over the flap without the need of a small gap. The Cessna flaps also extend rear ward as well as downward. I can't afford the weight of...
  12. Z

    Flaps on a Super Cub - Why a gap strip?

    Birdman, I looked at the drawings of the Super Cub wing and Flap construction. The rear of the wing's underside curves up nicely, but then changes to a straight line to the top of the wing. When the flap is extended there is a large gap. I can see how the gap strip which has a curved underside...
  13. Z

    Flaps on a Super Cub - Why a gap strip?

    I found some flight test videos using streamers to show the airflow over the flap without a gap strip, with a gap strip and with a gap strip plus vortex generators place on the gap strip. Without gap strip: https://www.youtube.com/watch?v=CqGDaUIVGIU With gap strip...
  14. Z

    Flaps on a Super Cub - Why a gap strip?

    I have been trying to figure out the best configuration for flaps on my 85% Super Cub project. I would like to keep them as close to the full size Super Cub as possible. On the Super Cub, the retracted and extended flap position is fairly close to the wing and in addition they have a gap strip...
  15. Z

    Need Help for Cub Type Trim Actuator

    I am surprised to hear you are using the 30mm 210 ratio. It seemed too fast and too short of stroke to me. This is a video clip https://www.youtube.com/watch?v=-do1gOE5DZ8 shows the speeds of the 30mmm 50mm and 100mm stroke speeds. Skip to 2:40 for the test. The 50mm stroke seems a little fast...
  16. Z

    Need Help for Cub Type Trim Actuator

    If I use a screw jack system I'm hoping not to have flutter with the front and rear HS tubes being 7/8" 4130 tubing using only a rear cable. I looked up the Firgelli Technologies actuator you mentioned and it looks like a good solution too. It would fit inside my elevator and all I would have...
  17. Z

    Need Help for Cub Type Trim Actuator

    I came across this site Fly Baby Elevator Trim with an interesting take on a spring tension trim set up that could be added to any plane. It uses a small auto window regulator cut down and a cable attached to the geared arm. In my search for window regulators I came cross some cable regulator...
  18. Z

    Carburator Expert Needed For A Few Questions

    As always cost is a major factor. If I could afford one, I could get a UL Power 350iS engine! :devious: I first wanted a constant velocity carb which would auto adjust the mixture, but it seems finding one that would work with my engine and confined space is difficult and could cost $200 -...
  19. Z

    Carburator Expert Needed For A Few Questions

    I have been thinking of ways to get more rotation of the mixture screw. 1: Linear to rotary gear system. 2: Planetary gear set with a lever arm. 3: Cog belt with two cog gears - linear to rotary with cable mounted to the straight section of the belt. After looking into robot gears and parts...
  20. Z

    Carburator Expert Needed For A Few Questions

    The rotating cable is probably the easiest to hook up but thinking about, has some draw backs. First every time you use it to adjust the mixture your high speed mixture at your take off altitude is change, requiring a full throttle run up and adjustment before every take off. The second could be...
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