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  1. P

    Van's Aircraft Laser Cut Hole Fatigue Analysis

    The Van's website has a good discussion of flying the RV-8 and airspeed limitations. There are more detailed discussions on the VAF forum about how the Va numbers may be incorrect. The RV-8 Va is about 135 mph (~118kts). For the F1 that I fly it is 125kts. It is easy to get lost in the weeds...
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    Van's Aircraft Laser Cut Hole Fatigue Analysis

    Continuing... Oh-Oh, time to pull out the K&E and my $32.50 copy of Bruhn, purchased new in the dark ages. I set up a 2 cell shear flow analysis and first calculate the MOI. Suddenly I realize that the skin is a much larger percentage of the MOI than I thought because the spar depth is shallow...
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    Van's Aircraft Laser Cut Hole Fatigue Analysis

    Workmanship issues will always be an issue in experimental aircraft, particularly with first time/only time builders. All of the guidance in the Van's publications is really very good, but humans make errors, and sometimes we don't realize made an error. The introduction of matched hole parts...
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    Van's Aircraft Laser Cut Hole Fatigue Analysis

    Bill nailed this one perfectly. My sentiments exactly. In January I requested more detail on the testing, specifically on the actual numbers placed into the simulations. I wanted to use the numbers for the FEA/shear flow analysis models we were using to analyze the problems we are seeing with...
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    SDS CPI-2 Ignition Conquers the North Atlantic

    I typically crank in 10 deg of flap on TO with my F1 to get the nose down so I can see the runway. With a full load, particularly an aft cg TO, I have used 20 deg. My guess is that with the weight he was carrying, and more than likely an aft loaded aircraft, he didn't get the flaps fully...
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    Design for Comfort

    This is an area that seems to be an afterthought in many designs. But I sure would like to have an adjustable seat and/or adjustable rudder pedals in my F1. It's not uncommon to start squirming in the seat after awhile to find a new comfort zone. And with a tail wheel, I've always liked to...
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    Fiberglass Reinforced Silicone - DIY Seal construction

    Take a look at this thread, it may give you some ideas: Tip: Rubber Ducts - VAF Forums
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    F1 Rocket stability

    First post, guys, sorry for just leaping in here. I am 30+ hours into Phase 1 on my F1 Sport Wing. On the Sport Wing, the build manual explicitly calls out 3/4 deg incidence on the wing, and 1/2 degree on the horizontal stab. However, I could find no explicit call out in the EVO build manual...
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