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  1. A

    Ducted Fan Pseudo-Jets

    Is a motor cycle engine (they don't say which) driving an internal fan to give the appearance of a jet aeroplane. Other videos used to exist -may still but... Personally I'd be looking at using a large vehicle cooling fan driven at high speed. Injection moulded ready made fans ready balanced...
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    A friend of mine just found a second design change in the MAX that likely explains the crashes

    One of the issues is that the two crashes happened on climb out not at cruise altitude so the crews had too little time to read pages of checklist
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    737 grounded???

    If only a thousand people die on the roads today it's a good day for the insurance companies, but the media will always make a months news out of 1000 deaths in the air even once every ten years! However IMO the issue is that pilots with too much simulator time and too few type ratings in a...
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    Are mistakes in plans common?

    LOTS of modern copiers are actually scan and reprinters and most have OCR, The use of an odd font can easily let characters be mis printed
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    Are mistakes in plans common?

    Unless they are real blueprints they are likely copied through an optical character recognition reprinter. So there is one source of errors. Also some fits as drawn take no account of any surface treatments required, plating and painting both have thickness. CAD with CAM can make life easier for...
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    Stall progression

    https://www.airplane-pictures.net/photo/1162587/g-apyg-private-de-havilland-canada-dhc-1-chipmunk/
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    Small turbine engines.

    I've been looking at a design that needs two or four small turbine engines, however they all seem to be silly money, short life (25hr tmo), and funny fuel (2 stroke! with total loss oil), and without generator. Is there a good place to look for moderate size engines, at a moderate price.
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    Great new catagory

    For those who put in an hour per week, electricity seems a great plan, for airlines with a 40 minute turn round and an eight hour flight it's probably not a project at the moment. Then you could look at engine progress since the Wright brothers era.
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    USMC plywood resupply drone

    dehavillandmuseum.co.uk/dehavilland-aircraft/world-war-2-assault-gliders/
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    USMC plywood resupply drone

    There were operations in WW2 where containers (not ISO!) were dropped by parachute to forward or clandestine troops that could have been better supplied by drone. BUT always a proportion of supplies dropped landed in enemy hands. Once the drone control system is in enemy hands subsequent drones...
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    USMC plywood resupply drone

    designed by DARPA for three zeros more than if HBA built one.
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    Stall progression

    The DH Chipmunk initially had a vicious stall with the tips stalling first so they fixed little triangular sections to the inboard front of the wing leading edge, to force the roots to stall first -with a more gentle effect. So stall behaviour can be treated afterwards. From memory they were 1"...
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    Is the coefficient of lift during a descent always negative?

    In normal flight it must be hard to achieve negative lift, maybe a bunt or entry into an inverted loop. As a military dogfight pilot it's more likely. as an airline pilot it's probably impossible.
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    Jet glider Take Off Parameter

    look at these engines http://www.amtjets.com/lynx.php http://www.amtjets.com/lynx.php Lots of choices according to the power that you want. There is, in the UK, a Pitts with two additional turbine engines for high power aeros. It's had one write up in the LAA magazine but wasn't complete last...
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    Landing lights in wooden wings

    IMO anything 10 degrees or less is interesting and useful. Make very sure that you find a way of getting the heat away from the chip correctly and then away from the wood without scorching anything. Do please let us know what you actually use.
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    Jet glider Take Off Parameter

    The BD 5j is reported to use 250lbs thrust. Beware the fuel burn of small turbines, fit bigger tanks! Beware also the service interval. Turbines for models tend to use oil mixed into jet fuel and split the fuel between the burners and the ceramic bearing lube. Bearing change can be as little as...
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    Jet glider Take Off Parameter

    The BD 5j is reported to use 250lbs thrust. Beware the fuel burn of small turbines, fit bigger tanks! Beware also the service interval. Turbines for models tend to use oil mixed into jet fuel and split the fuel between the burners and the ceramic bearing lube. Bearing change can be as little as...
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    Aviation related music.

  19. A

    Aviation related music.

    please delete
  20. A

    Aviation related music.

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