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  1. H

    2006 RV-7A N17HH

    I'm asking a mere $85,000 for this gem. Under 250 hours TT A&E www.n17hh.net https://1drv.ms/f/s%21Aq7tTGb0Z-9d9AiGAAbZHERxMpma PM if you would like to discuss.
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    Were you at Jack Norris's Prop forum at Airventure 2014?

    Jack Norris gave two presentations at AirVenture 2014. The first was titled “A Master’s Course..” and the second was titled “Props Nailed Easy”. At each he collected names and $10 per name for a short paper he wrote. Unfortunately, he misplaced the 8 names from the second presentation. He still...
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    "slowdown" or "blockage" in prop design

    I have been a heretic on this subject for quite a while. Most prop designers compensate for "slowdown" of the inbound stream resulting from the body behind the tractor prop (prop in front of cowl). I think that this is very poorly understood and that the designers are missing a lot. This post...
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    Albatross flies for free?

    I don't claim to understand this yet, but given the nature of posts by Henryk and others in this forum, I thought you might all like to take a look: PLoS ONE: Flying at No Mechanical Energy Cost: Disclosing the Secret of Wandering Albatrosses "ABSTRACT: Albatrosses do something that no other...
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    My New KiwiPropellers prop

    It can finally be made public. I bought the first prop designed by John McGinnis (Synergy aircraft). It is being made by a new New Zealand company that can be found at: www.kiwipropellers.com It is designed for my RV-7A. When I have flown the prop I will do my usual, honest, objective...
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    You are invited to my AirVenture presentation

    I will be presenting "Drag, Speed and Prop Design" (or power and drag..) at Airventure 2012, Friday 27 July, 11:30 a.m. in the Homebuilder's Hangar: What comes after the Norris Zero Thrust Glides? 2010's talk was about how to find your airplane's drag curve. 2011 was the Triangle Tool & how it...
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    Dumb question, perhaps

    I have seen many drag polars, especially in CAFE reports, which show induced drag based on the weight and the span. They also compute total minimum drag = thrust based on weight and sink at V for L/Dmax. I get that and I get why they should be equal. And, of course, at V for L/Dmax induced...
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    FRIENDS OF SYNERGY!

    The kickstarter project was declined. Synergy is taking it to the people. It worked for Rutan. Let's make it work for Synergy. See: www.n17hh.net/Synergy . Tell everyone you know. Thanks!
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    Flapping, human powered, assisted flight - is this real?

    Dutchman flies like a bird with homemade wings | Software, Interrupted - CNET News
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    Understanding engine horsepower and fuel consumption

    I was just curious, so I started with the size of my engine, the characteristics of fuel and air, the way a 4-stroke, gasoline IC engine works and the numbers from Superior. I eventually concluded that the volumetric efficiency of the engine is 97.83% at full power, WOT, specified conditions (by...
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    GFC Results - What is wrong with this picture?

    GFC - What is wrong with this picture?
  12. H

    Testing a New Prop Design, first installment

    Testing the Prince Elliptical Prop I welcome your comments, of course.
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    Analyzing Span Efficiency

    Please refer to this post on Van's AirForce forum: Looking at the Elippse WingTips (Jim Smith's airplane) - VAF Forums Your questions and criticisms are invited! update 8/6/2011 - I have been corrected that I'm looking at "span efficiency" but not Oswald's number.
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    Small "Mutt Muffs", virtually new

    This will help anyone who wants them to understand the size. I don't know if they are small, tiny, medium or whatever. The picture with ruler should answer the question. Note that the second picture shows them at their maximum inter-muff distance (adjustable with velcro). The "flag" is the...
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