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    I would love a copy of Hoerner! I had a photo copy at one time but it got destroyed when the...

    I would love a copy of Hoerner! I had a photo copy at one time but it got destroyed when the roof of the building I was in came off in a hurricane and everything got soaked. Mark Kettering aeromomentum@yahoo.com
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    Boeing - Design Issues...

    Without the government Boeing will have zero future and this is due to Boeing's own actions. While I have very little trust in the US government I have even less trust in Boeing management.
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    Boeing - Design Issues...

    Let Boeing sell stock and bonds on the market. Only if they go to zero should there be any government money of any type going to Boeing. Issue new stock and bonds in exchange.
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    Rotax 582 Alternative Possibility

    Sorry, not at this time. I have run 2 stroke outboards for thousands of hours and have run 2 stroke snow machines for hundreds of hours all without any failures that were the fault of the engine so I know that a 2 stroke can be reliable and long lived. But we are too busy at the moment. I...
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    Sun n Fun 2020

    It seems that the government of Lakeland forced SnF to be postponed/canceled.
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    Rotax 582 Alternative Possibility

    From other forums the design life of the 600 ETEC is 10,000 miles in a snow machine or about 200 to 400 hours. About the same as a 582. From these same forums it seems that many (most?) do not make this but a lot can depend on how they are operated and maintained.
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    Eviation Alice prototype fire

    They need an aeronautical engineer that understands finite wing trailing edge vorticity. We need to stop calling it "wing tip vortex" or other incorrect and misleading terms.
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    No one can explain WHY planes fly...

    It actually is really simple. You can also derive Bernoulli from Newton. Both are valid when applied correctly. The issue is many people try to use a scalar version of Bernoulli when with 2D or 3D flow they need a vector version. It is not delta speed that maters but delta vector velocity...
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    Modern Aircooled 4-Cylinder Aircraft Engine Using Contemporary Engine Technology

    Sorry I came across as self promoting. It was not my intent to promote our engines specifically, I was intending to state the advantages of liquid cooled geared engines like Rotax 912iS and many others. From the calculations that I have run the lifetime cost advantages are overwhelming. Do...
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    Modern Aircooled 4-Cylinder Aircraft Engine Using Contemporary Engine Technology

    Looks like a great engine. Air cooling limits (reduces) the compression and fuel efficiency. Two valves limit the volumetric efficiency. While many don't think this is important, in reality you will spend well over three times as much on the fuel as you spend buying the engine in the first...
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    Boeing - Design Issues...

    Don't forget that Airbus was just hit with a $3.5 BILLION dollar fine.
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    4500rpm propeller to negate the PSRU

    Sorry! I was just using real world examples that I am vary familiar with to provide actual cost examples showing that direct drive is not generally economically advantages. Yes you can MAYBE save a little money upfront but it will cost you a huge amount over the life of the engine. If the...
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    Why so expensive??

    Well, we start with a Suzuki base made in the millions. Or are you talking about those Rotax engines for sale from Indonesia? The small volume parts we add to the engine cost way more than the engine and the small scale production adds a huge amount to our assembly cost. I do think that you...
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    4500rpm propeller to negate the PSRU

    Or you could put in a 30% smaller motor saving money and weight and add our PSRU ($1900 plus your mounting). Not only will the whole system be lighter but it could cost less and be 30%++ more efficient. Over the 2000 hour life this would save $24,000 even at just $4/gal and assuming about...
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    Why so expensive??

    Yes but Factory Five sells 100 times as many kits as a typical kit aircraft company. This higher production allows for much lower costs. Plus the aircraft kit uses things like aircraft bolts that cost 10 times as much as bulk automotive bolts. The aircraft kit also has many more parts and...
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    4500rpm propeller to negate the PSRU

    Just to keep things is perspective, our PSRU is 16.3 lbs and can be used on a 4 cylinder engine to about 225hp and on an 8 cylinder to about 400hp. Keep in mind the peak torque impulse is the limiting factor. With the mounting bits it is 25.7 lbs. It requires 8oz of oil. So 26.2 lbs wet...
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    4500rpm propeller to negate the PSRU

    Keep in mind that a faster turning prop of the same diameter has more drag for the same thrust so requires more power. With everything else being correct for the rpm and with the prop the same diameter if you go from 2240 rpm to 4500 rpm you will need 46% more power for the same thrust. Or...
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    Direct Drive Honda/B&S limits

    As a manufacturer of engines with PSRU's and of the PSRU itself I may be a little biased but there are some compelling reasons for turning the prop slower. Keep in mind that a faster aircraft has a lower L/D just like a faster turning prop. If you keep the prop the same length a direct drive...
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    S-LSA downsides

    At what point does a "repair" become an "alteration"? So for a "repair" (of any type) you need to follow "(7) The owner or operator complies with the requirements for the recording of major repairs and major alterations performed on type-certificated products in accordance with §43.9(d) of this...
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    Raptor Composite Aircraft

    "The devil is in the details" Audi makes good engines but I do not know anything specific about the version Peter is using.
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