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    10/23 Raptor Video

    Technical observations/ questions on the 10/23 Raptor video: 1. Observation - The nylon tufts appear really stiff compared to yarn ones. Question - How much flexibility is needed to be able to ascertain the flow behavior? 2. Observation - As mentioned in the video, there appears to be...
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    Aero News Network Video - Terrible Raptor 1st Flight Review

    According to both Peter's and Wasabi's videos on the subject, the only reason Wasabi did not fly it on their last visit was the airport did not have a long enough runway and not very good bail out options. They both stated the "must fix" items were addressed at that time. Peter moved the plane...
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    Aero News Network Video - Terrible Raptor 1st Flight Review

    Maybe PM can develop a new mission statement and make the Raptor become a Ekranoplan (Ground Effect Vehicle). It might have enough useful load to carry 5 passengers and full fuel in this mission...
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    Aero News Network Video - Terrible Raptor 1st Flight Review

    At the end of the video he says his car's engine crapped out and that due to that he needed to find new vehicle and would be delayed on Raptor work. He was talking about his automobile, not the Raptor's engine.
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    Suggestions/feedback for new production engine

    Agreed. About the only way to successfully get an engine certified in the US market is to get a Airplane manufacturer to foot the bill for their airframe use, and then even many of those never come to fruition. Experimental is about the only means in the American market for new engines.
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    Raptor Composite Aircraft

    Again, I do not see one side flexing. I see both sides moving equal and opposite. To me it looks like the spar that joins the wings (to make them 1 element) and the fuselage bottom are doing the flexing (i.e., changing the shape of the bottom of the fuselage), but the wings appear to be moving...
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    Raptor Composite Aircraft

    We already know the bottom of his cabin is weak, thus the steel plate for his pivot points in the floor board. It looks like his wingtip to wingtip is fairly rigid but the spar to fuselage bottom flexes (i.e., the cabin flexes over the wing spar).
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    Raptor Composite Aircraft

    To me, it looks like the forces are transferring through to the other side more than the wing itself flexing. There seems to be an opposite and equal action on the opposite wing tip for all of his shaking. To me that looks more like the landing gear is not rigid so the shaking is not lifting...
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    Presurization - Whats it take ?

    The pressure inside the balloon is roughly 14.7 psi. The pressure differential between the inside of the balloon and the outside (at STP) will be less than 0.5 psi.
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    Presurization - Whats it take ?

    In the brainstorming arena, could you create the second barrier similar to a balloon? Cheap party balloons start at about 14 psi. So could you create a strong enough/light enough membrane with lightweight bands (kevlar or carbon fiber) to keep the shape of the membrane regardless of pressure...
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    Raptor Composite Aircraft

    I believe that his turbos and the Wye he had built for them are almost directly under the radiator too, and he has videos where the wye was regularly glowing red from the heat. SO there is some radiative heat to the radiator from the turbos. The EGTs (>1400 degrees) are significantly higher than...
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    Raptor Composite Aircraft

    I am saying the turbos are significantly adding to the heat load of the engine and the area inside the cowling. They are not providing cool air to the engine, they are significantly heating the air entering the engine in the current configuration. Also, due to the incorrect sizing relationship...
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    Raptor Composite Aircraft

    Ultra Lights would be happy with those specs, lol.
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    Raptor Composite Aircraft

    He has a Radiator under the vent and an intercooler under the radiator. But because his turbos have the same size inlet/exit, he is creating an order of magnitude more heat through the second turbo and causing the heat issues and choking the HP on the engine. As others have said, since the...
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    Raptor Composite Aircraft

    Unfortunately you are probably correct, but to fix the cooling, he will probably have to rework the turbos which should at least get him more HP and probably save him some weight.
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