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  1. M

    First Flight Anomalies

    There was an excellent presentation about what can go wrong on first flights on the SETP members site. I asked them if they could make this public, because there were many good lessons learned that should be distributed to teams and people involved in first flights. They agreed, so now there is...
  2. M

    Van's Aircraft Laser Cut Hole Fatigue Analysis

    Cracks are just programmed to happen in sheet metal aluminum airplanes. I see this a lot on airplanes that come into the local maintenance shops. For example, take a close look at the attached picture this aileron hinge of a Piper. There are two cracks in the aileron, both stop drilled. This...
  3. M

    Bronze vs. sealed precision bearings for control surface hinges

    Look up tolerances for interference fits to see what is recommended for the materials you use.
  4. M

    Is there any proportion rule for aileron and flap chord proportions?

    The change in lift per degree of control surface deflection goes up (not linear though) for a larger ratio of control surface chord to wing chord. This is mainly used on slow flying aircraft that need good control authority at down to stall speed and aerobatic planes. Newer airfoils are designed...
  5. M

    Bronze vs. sealed precision bearings for control surface hinges

    My latest video is on control system bearings: Link Tutorial 22 https://youtu.be/ECCp44UrhbY Flight control system bearings
  6. M

    force one prop hub seal leaking

    About 250 h. Yes, it looks that way.
  7. M

    force one prop hub seal leaking

    The bearing OD is 2.300"
  8. M

    Wing rib to spar adhesive/epoxy

    Do not use silicone adhesive for this or anything else that is THAT flexible. Use a structural adhesive, like mentioned in previous posts.
  9. M

    force one prop hub seal leaking

    Here are a couple of pictures of the case and with Force 1 hub.
  10. M

    Engine cooling, my solution

    That was me. Crossflow can cause significant asymmetric cooling, which is prevented by having a partition between left and right cylinders. It is still an indication that one inlet is working better than the other one.
  11. M

    Experience re-engining a certified aircraft?

    I have done an engine change STC for Mooneys, going from a 4-cylinder Lycoming to a 6-cylinder Continental, both normally aspirated, and did engine installations for TC. For the Mooney, the power was the same, airframe limitations stayed the same, but the engine weight & cg were slightly...
  12. M

    Book detailing homebuilt materials/construction methods?

    "Composite Facts" 112 pages, over 60 illustrations, by Sonja Englert (ISBN 0-9752984-0-2), $35.00 This book covers the hands-on basics of working with composites. Learn about different materials like glass, carbon, aramid and spectra fibers. Become familiar with different manufacturing...
  13. M

    Fuel Tank Vent Check Valve

    I think the worst case for pressure in a wing tank may be in a spin, when the fuel is pushed outboard. That is where the number may come from.
  14. M

    Discussion: Design Log for 2-Place Touring Plane

    I enjoyed designing and building an airplane, even if it took a looong time. In the mean time, I had something else to fly. Worked for me.
  15. M

    Fuel Tank Vent Check Valve

    The end of the vent tube should be in a place (like bottom wing surface) where fuel dripping out does not get on or into structure. Having vent tubes in the fuel caps sticking out over the wing is an unsuitable design.
  16. M

    P-Lead Wiring With Toggle Switches

    Main difference between wiring magneto ignition switches and electronic ignition switches (like Rotax); Magneto, engine on - switch is "OFF" (no contact between switch terminals) El. ignition, engine on - switch is "ON" (contact between switch terminals) The rest is the same.
  17. M

    Angle of Incidence Tolerance

    Pulsars have a history of all being left wing heavy, but 1 deg difference in incidence is extreme, Better fix this, Bob.
  18. M

    Engine info? Great Plains 2180 with some sort of belt drive

    I tried to look it up but can't find it. Can you share a link to the seller? Thanks.
  19. M

    Aircraft component weight data source (wheels, plexiglass mass/sqft, fuel line, etc).

    How about starting a new thread where the only posts allowed are item description and its weight?
  20. M

    Horrible news from Vans Aircraft

    It has been my experience, after working for decades for small airplane companies, that their profit margins are so low that they are always on the edge of folding up, if a major disruption comes along. Most of them are doing a good job of keeping prices low for their customers, but that also...
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