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  1. G

    Bottom piano hinged aileron

    Is there any fundamental reason not to have a bottom piano hinged (or similar location hinged) aileron? Most ailerons that I can recall that are mounted with piano hinge have the hinge on the top surface. Flaps are generally the opposite for more obvious reasons. Frise ailerons are bottom...
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    BLC wing small sport plane feasibility.

    I’ve read a good bit about BLC (suction specifically) on everything from jets to gliders. Much of it was theoretical, CFD analysis, wind tunnel studies, university thesis papers, the extensive work of Boerman and others. There were a number of powered plane real world tests, much of which...
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    125hp Four seat low wing plane?

    I ran into this Australian business Morgan Aero and this 4 seater caught my attention. The bit under preliminary information just below has left me wondering a few things: That appears to be a pretty big weight and balance swing for such a lightweight plane and for such modest power, even with...
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    Pultruded carbon suppliers

    I am looking for suppliers for large cross section carbon fiber pultrusions, preferably in a rectangular shape. The primary application is not aviation related, but as I am looking at building a composite airplane, the remainder of the roll will potentially make it's way into the plane. And...
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    Tail airfoil references?

    David Lednicer's "The incomplete guide to airfoil usage." The Incomplete Guide to Airfoil Usage is a great reference for wing airfoils. Is there a similar list that shows the tail airfoils. I am particularly interested in tail airfoils for a fast, lightweight (sub 1400lb gross) plane capable...
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    minimum propeller (to ground) clearance

    From the FAA: Sec. 25.925 Propeller clearance. Unless smaller clearances are substantiated, propeller clearances with the airplane at maximum weight, with the most adverse center of gravity, and with the propeller in the most adverse pitch position, may not be less than the following: (a)...
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    Custom cowling to firewall attachment.

    I am intrigued by the method in which Cory Bird used to attach with cowling to his firewall on his grand champion winning Symmetry. The halves are kept together with a common piano hinge setup, but the cowling to firewall attachment has me stumped a bit on the finer details. I have never seen it...
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    overnose vision angle minimums

    From Raymer's Simplified Aircraft Design for Homebuilders: "A key concern for the front of the aircraft is the overnose vision angle. On your layout, draw a line from the pilot's eye forward, at a downward angle just touching the top of the cowling or whatever else prevents you from seeing...
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    Vertical Stab mounted pitot tube (ala Nemesis NXT)

    This seems to be a very smart, clean, and safe place to mount a pitot tube. Any reason why a similar vertical stab mounted PT would not make sense on a more modest 200mph low wing airplane? George
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    technical reference listing-- AWESOME

    I just wanted to thank Orion for his new selfless quest to assemble for us an organized section for reading materials. Once it's all together, I believe it may well be the most helpful section of information on all of HBA. I most certainly look forward to it. George
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    HP power draw from alternators

    Taken from a popular KR website: "This "dynamo" is from a John Deere model 670 lawn tractor (any X70, actually), and weighs 4 pounds with the regulator. Output is 20 amps minimum when driven by the mower's 6" pulley running at 2500 rpm. Part numbers are AM877557 for the alternator ($160), and...
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    New Corvus (Red Bull) racer

    Corvus Aircraft :: Racer Team Besenyei unveil new Corvus Racer :: Red Bull Air Race Videos A bit of eye candy to share. Notice the NXT style tailwheel within the rudder area setup. Looks to be a pretty slippery "aerobatic" bird. George
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    CAFE Triaviathon challenge with an 0-200 powered plane?

    Purely for the mental challenge. Could the CAFE Triaviathon record be sucessfully challenged with an custom designed and highly optimized 0-200 powered, two place side by side, tractor style plane? If so, what would it be like? For those who are not familiar with the Triaviathon...
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    Twisterons- adjustable wash out

    Reading the wash in/wash out thread made me think of the "Twisteron" concept. The idea being the ability to alter the "wash in/wash out" to suit the specific conditions of flight. Both aerodynamic and geometric twist are normally fixed. I'm curious as to whether this technology, or some form of...
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    LoPresti retractable wheel pants

    April 10, 2008 by Dave Hirschman, Senior Editor Every now and then, we all stumble across an invention that seems so simple, so obvious, that we wonder why no one (including us) did it before. Such is the case with LoPresti Speed Merchants’ “Speedpants.” They’re regular composite wheel...
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    experimental aircraft for business use

    So, clearly getting paid for taking others up in an experimental is a no no without an unlikely special blessing from the FAA. I'm interested in what business use is possible for experimentals. Such as skywriting and aerial photography. Seems to be OK. How about: Banner plane? Delivery...
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    Questair Venture canopy design

    I have been looking at the different canopy designs out there and came across the Venture's design below. It seems to be unique in that the plexiglass canopy has no reinforcement. The canopies thickness is greater than the typical to help make up for the lack of frame. The prototype had a 1/4"...
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    "through the fence" and trailerable aircraft

    I have been reading about the fairly recent move to eliminate "through the fence" permits and agreements involving airports that accept federal funding. Below is a (brief definition of TTF) snippet that I pulled from a short article: "(Through-the-fence operations are those in which a public...
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    NLF 0414(f) on a lancair

    So lets say that someone aquired an early untouched Lancair 200/235 kit. And he wanted to gear the plane from the get go for competition but preferably without completely destroying it's real world capabilities. By competition I mean some sport air racing events, Airventure, possibly some...
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    inflatable canopy seals

    I'm looking for information on inflatable canopy seals. Specifically for one piece canopies with continuous gentle curves mating to the fuselage, such as a glider. I am also interested in other methods of sealing a one piece canopy to fuselage. I want to have an airtight and watertight seal...
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