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  1. D

    Motorcycle engines revisited

    Not to steer off topic too much, but I have recently been fantasizing about using a motorcycle engine for an aircraft, but for a roadable design. My logic is that since you need a transmission for road propulsion anyway, having one attached to the engine might actually be ideal. Of course, I'd...
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    Sideways landing

    Regardless of what you think of the pilot's judgement and/or technique, that aircraft would definitely be due for a hard landing inspection. The 737-300 and later does indeed feature a torsional damper on the mains. It may have had something to do with the autoland certification, but I was told...
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    Horiffic 747 crash at Bagram Airbase

    I read a couple interesting things on the very long thread on the PPRuNe forums. The first is that the MRAPs, being exceptionally heavy, aren't simply held in place on the pallets. After the pallets are locked in to place, the vehicles are secured in to place with approximately SEVENTY...
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    Horiffic 747 crash at Bagram Airbase

    I used to work as a 747 mechanic for Southern Air, another airline that charters military flights in and out of places like Afghanistan. In fact, my first fear when I heard a cargo 747 crashed in Afghanistan was that it might be one from my former employer, though it's tragic regardless of who...
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    What To Do With Cured Prepreg?

    Is the shelf (frozen) life expired or is the room temperature ("out life") expired? If the shelf life is expired but the material is still frozen, you can still use it for non-structural, non-critical applications if it's still workable. If the out life is expired, then the resin is partially...
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    A good control for cowl flaps?

    I've always thought an electrically actuated, electronically controlled cowl flap system would be nice.
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    TIO-541

    Understood, but I'm not trying to build a "general" airplane. The problems you mentioned are not insurmountable, and I'm willing to take the time to figure out solutions to those problems. Also, the 541 is just one of several engines I'm considering. In any case, I appreciate the words of...
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    What are epoxy fumes made of?

    I think your logic is on the right track here. The 3M cartridges we use at work cost 11 bucks a pair, and they last about 10 hours. Even with the longer life, it's a bit too pricey unless you have a known allergy. That said, there shouldn't be anything but good clean air coming through the...
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    TIO-541

    I looked up the TCDS for the TIO-541-E1C4 and plugged the information in to my airplane design in X-Plane. To accommodate the higher power and higher RPM, I switched from a 3-blade to 4-blade prop and reduced the diameter. I was pleasantly surprised at the results. When compared to the...
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    What are epoxy fumes made of?

    As for your other questions regarding curing: again, it depends on the resin system you're using. 60 degrees sounds too cold for most systems. Read the directions supplied by the manufacturer and follow them precisely. They will usually specify a minimum temperature for curing. If it's not warm...
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    What are epoxy fumes made of?

    Hot Wings has you pointed in the right direction. Check the MSDS for the specific system you will be using and obey the PPE guidelines it gives you. I'd just like to point out that at my workplace we use primarily 3M 282 epoxy, and as long as there is adequate ventilation, no respiratory...
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    Homebuilt Fuel Tank ("Cell") Design and Fabrication

    What about building a tank using Kevlar or carbon fiber with a flexible resin? That would make the tank flexible and crush/cut/burst resistant. The problem is figuring out what resin to use.
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    Airfoil and planform selection

    Okay, I'm a knucklehead... I just found the stickied post with all this information in it.... Nevermind!
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    Airfoil and planform selection

    Can anyone point me in a proper direction on how to select airfoils and planforms for my airplane design? It doesn't seem like there is a whole lot of freely available information on the internet, and what info there is is incomplete and relates to designs from decades ago. Is there maybe a good...
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    TIO-541

    Thanks, djschwartz. That's the kind of information I'm talking about. I was trying to find specs on the engine and Google failed me. I had forgotten about the short stubby props on the Duke. No matter how you slice it, short props with lots of blades are heavy and inefficient. I could go with a...
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    TIO-541

    The ones I have seen for sale are Duke engines, -E1C4. I can work on the engine myself, so i am mostly concerned with parts availability and prices, and finding a shop that will overhaul the cylinders and accessories. I'm also wondering if there are any killer ADs or SBs, or any other "gotcha"s...
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    TIO-541

    Greetings from Mojave, California! I'm a first-time poster on this forum. I'm looking in to various options for a turbocharged Lycoming 540. One that's popped up on barnstormers.com is a TIO-541. There are several for sale, relatively cheap, including everything firewall forward. I know it's an...
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