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  1. S

    Firewall Forward max weight reasoning?

    Thanks very much. this is me mostly just trying to understand airframe design. I understand that controllability and structural integrity can be the limiting factor to FWF. It didn’t make much sense to me that FWF just be a weight limit in the case for structural limit. Rather, as you suggest...
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    Firewall Forward max weight reasoning?

    Thanks. I’ve had an opportunity to write Mark. He was kind enough to answer my questions, which I’m sure he’s been asked a million and one times before.
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    Firewall Forward max weight reasoning?

    Thanks very much. Definitely something you wouldn’t want to do without significant analyses and thought. Looking at a Sonex B aeromomentum Am15 combination. Very cool engine, but mostly trying to understand aircraft design more. I also wondered about vibratory loads and whether that factors...
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    Firewall Forward max weight reasoning?

    I’m trying to understand what drives the maximum firewall forward weight. Since the Engine is cantilevered, I am assuming that one component is simply the stress on the engine mount. If this is the case, then an airframe max g could be derated. Another factor is elevator control authority. This...
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    Bolt holes, burr and fatigue life effects

    Thanks for everyone's input. My brain is slowly "grokking." Just trying to build the right model in my brain so all the factoids I pick up fit together. Interestingly, I learned as I read through materials that while differences in clearance may affect how much load a particular bolt takes...
  6. S

    New EAA Chapter Build Project SoCal

    That's awesome! At EAA20, there is a fairly robust, kid focused programming. EAA20 also just did first flight for the club built RV-12
  7. S

    Does your auto-conversion airplane have over 500 hrs TT?

    Always enjoy seeing the statistics that Ron presents and the discussions afterwards
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    Do extrusions (non cut side) need to be polished?

    Thanks very much. It makes sense to me. At the microscopic level, where all the fun really happen, the lines on the extrusion would be much smoother than where a cut was made.
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    Do extrusions (non cut side) need to be polished?

    I was reading through the Zenith construction standards and there was a mention of the need to remove all cutting marks as they may be stress risers. That makes sense to me. I wouldn't consider extrusion surfaces to be smooth. They often have lines that show the direction of extrusion. Do these...
  10. S

    Bolt holes, burr and fatigue life effects

    I've been told that not properly deburring can lead to decreased fatigue life in a bolt hole. I'm trying to go through the mental exercise of how burrs affect the fatigue life on a joint. Haven't found a good explanation yet on the internet. I understand how a crack that is cyclically loaded may...
  11. S

    Lowest cost AHRS EFIS/6 pack replacement?

    There is also Open Flight Solutions as well. Has the Raspberry Pi based systems proven unreliable or are there other issues?
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    Cheapest solution for Mode C Transponder and ADS-B?

    I saw this DIY Mode C transponder awhile back. Has anyone put it together? There probably are legal issues http://antena.fe.uni-lj.si/literatura/S53MV/avionics/avionics.html
  13. S

    Spinning and unremoveable nylock. Any tips?

    Thanks for linking and the healthy discussion. My copy dated 2013 has a different value there. I wonder why they would increase it to what is beyond what people are typically doing and calculating
  14. S

    Spinning and unremoveable nylock. Any tips?

    Thanks for all the tips. I wound up taking the grinder to the head. Behind it was a bracket that could be sacrificed. Fortunately I didn't scuff it up. I was torquing the nylock to ~42 in pounds, which is what the RV-12 Vans manual says for a AN3 nut with nylon insert (Yes, it seems higher...
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    Spinning and unremoveable nylock. Any tips?

    Thanks, I'll try cocking the nut while trying to rotate it out. Hoping to not have to get the grinder out since it's in a tight location
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    Spinning and unremoveable nylock. Any tips?

    Hello All, I've got an An3 bolt with an nylock nut that I was attempting to tighten on some metal parts. For some reason, I couldn't achieve the appropriate tension. When I tried to remove, I noticed the nut would spin, but not descend down the thread. Yes, I held the bolt stationary. I'm...
  17. S

    Where to buy pre-bent stock aluminum sheet metal?

    Greatly appreciate it! It seems the right serach term was "formed" and not "C" since that gave me the thicker extrusions. Happy Thanksgiving all!
  18. S

    Where to buy pre-bent stock aluminum sheet metal?

    Looking to purchase some prebent 0.032" and 0.025" 6061 Aluminum C channel. It seems like it would be a common thing, but can't seem to find a source. I tried Aircraft spruce, Wicks, but no luck. Thanks!
  19. S

    Out of Wack Waiex?

    I took those pics of my recently purchased Sonex kit. Glad to have you guys look and critique. It'll sharpen my eyes when I'm diving deeper into the rest of the structure. I know the bottom tool you show is a deburring tool for holes. I don't know what that top tool is. An extender of some sort?
  20. S

    Repair of compromised Longeron

    Thanks all for looking and offering your opinions. I wanted to get generalizable information as well actionable info directly associated with my current problem. I had asked on a Sonex Forum, so that's why they look familiar. I wanted to poll a larger audience, to see if there were other...
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