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Type: Posts; User: Red B.

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  1. Replies
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    RE: Good airfoil choices for warbird designs?

    I am surprised nobody has mentiond Michael Selig's S8036 (root) and S8037 (tip) airfoils.
    These airfoils were developed for the Top Flight P-47 and optimized for model aircraft Reynolds numbers...
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    RE: Nordic Folkeboat

    Try contacting the The Nordic Folkboat International Association. Meanwhile here is a general arrangement drawing to wet your friends appetite.

    http://www.folkbat.com/folkboatplan.gif
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    RE: Types of Webra 60 questions

    Presently the only .60 class engines produced by Webra are the Speed 61F and the Speed 61F Competition. The first one is side exhaust with ringed piston in a steel cylinder and the second one is rear...
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    RE: Best 101" EDF unit?

    A 101" EDF unit is kind of large! Do you mean a 4 in class EDF

    In that case the the Stumax SM110-52 EDF unit is one of the best. In particular it is very quit while producing a lot of thrust.
    ...
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    RE: True scale models Who makes them?

    As far as ARFs are concerned the cream of the crop is KalderΓ©n & Welch Model Airplanes Inc.
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    RE: Starting engines in cold weather

    If the temperature is 25F, that is not very low as far as the fuel and engine is concerned. Make sure to prime your engine and also check your glow plug battery. Battery performance usually...
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    RE: What is washout?

    Geometric wing twist, i.e. washout as described above is often used in conjunction with a change in wing camber towards the wing tip. In general camber is increased towards the tip. By increasing the...
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    RE: Which Type Of Glue Do You Like The Best?

    My favourite glues are not available anymory :-(. It is the PICA Glu-It aliphatic glue and the Glu-It-2-It acrylic copolymer emulsion glue.
    If anyone know if these glues are available under another...
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    RE: Uniflow fuel tank set-up

    Using a check valve on the went line defeats the whole purpose of the uniflow tank system. As been previously stated, when the trottle is reduced to idle or low rpm after high speed running the...
  10. Thread: breathtaking

    by Red B.
    Replies
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    RE: breathtaking

    "Skyfighters" is most certainly not a spin on Top Gun, quite on the contrary. The film is based on"Tanguy et Laverdure", a French comic book series by Jean-Michel Charlier and Albert Uderzo which was...
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    RE: What's stronger, silk or Koverall?

    Not if you follow full scale practice and use an aluminum pigment primer before the color coats. It is mostly UV-light that kills the silk.
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    RE: 3-bladed prop for Saito 56

    Rule of thumbs are only that.
    In order to maintain the same rpm with a 3-bladed propeller as with a 2 bladed propeller using the same pitch and the same blade shape, diameter should be reduced by a...
  13. RE: Hearing protection & decibels of IC engines at WOT.

    Hearing protection is highly recommended when operating model aircraft combustion engines.
    My favourite hearing protection is the Peltor TAC6s head-set that have built-in microphones that filters...
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    RE: Pica Spitfire 1/5 scale HELP!!

    I have to disagree with the engine recommendations. Sure, if built like a brick it takes a brick of an engine to power it. If built light, say up to 20 lbs, the PICA Spit will fly very nicely using a...
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    RE: Why is this hobby so expensive?????????

    For me the great thing about aeromodelling is that this fantastic hobby can be made to fit almost any wallet. During my "career" as a model aircraft flier/builder I have covered the whole spectrum...
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    RE: Another battery question

    Do you have a high friction control system? A typical 700 mAh battery pack should easily give 5-6 flights of approx 15 minutes each with energy to spare for the kind of 40-sized aircraft you refer...
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    RE: 12v vs 15v 1A vs50MA

    The 15V output of your power adapter can supply a maximum current of 1A at that voltage. You can not use it to charge a 12 V battery pack unless you have some current limiting device that limits the...
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    RE: Teaching to Build

    Living in Japan you should have no problem finding a Kyosho Calamato trainer. They are really good trainers.
    After that I would suggest that you buy a proper kit to learn how to build your own...
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    RE: New Black Horse Models Gilmore Lion?

    Nice!
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    RE: How much castor?

    If you use really good synthetic oils, there is no need to add any castor at all! Some manufacturers of synthetic oils such as Fuchs (Aerosave and Aerosynth) specifically recommends not to add castor...
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    RE: Mojo 40 Yes or Other????

    The Mojo 40 is an excellent aircraft. It's quite strong and even I with my aging reflexes can manage decent 3D flying with it. I have built two of them and they are easy to build with decent wood...
  22. RE: Boundary layer separation, based on pressure diagrams.

    Like banktoturn, I also considerd the fluctuations around 20% chord to be artefacts of the calculation rather than accurate values.

    A short comment: What you should look for is the chordwise...
  23. RE: Boundary layer separation, based on pressure diagrams.

    Your guess is correct. As long as the the pressure gradient is favourable, i.e. the pressure decreases downstream, then the boundary layer will remain attached to the airfoil. When the pressure...
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    RE: relationship of ground effect and wing chord

    The ground effect is present irrespective of the size of the aircraft. Problem is that very seldom do we fly low enough with our model aircraft to notice it. Ground effect depends on wing span as...
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    RE: question about charging a 12V batt.

    Lead acid batteries should NOT be charged by a constant current charger as suggested by some. Instead they should be charged using a constant voltage source that is preferably current limited to...
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