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    Electric ducted fan Bluebird
    2 Posts ยท 14 Followers ยท 11 Photos ยท 32 Likes
    Began 8 months ago by
    Midshipman
    United Kingdom
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    Latest Post 8 months ago by
    Midshipman
    United Kingdom
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    ๐Ÿ“ Technical data
    8 months ago by ๐Ÿ‡ฌ๐Ÿ‡ง JOHN ( Midshipman)
    โœง 74 Views ยท 7 Likes ยท 1 Comment
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    To begin with I used several sets of drawings.

    I purchased a CD from a well known site on the web - containing the original drawings of Bluebird (as she was built). Also a few modifications to her.

    I purchased a set of plans from the old MAP site; these were of her final disguise.

    Then there were several books which I used for reference, which I will list further on for anyone interested.

    The materials used for Bluebird model consist of 2mm lite ply and also balsa wood. Obechi strip used for the majority of the planking. She is also coated in purely 4 coats of Z-Poxy finishing resin.

    First thing I did was make myself a true and flat building board to work from.

    I made loads of little plywood clamps so I could clamp the base of the hull which is 2mm lite ply flat to the building board.

    I didnt want the bottom to distort in any way. Then, I added the 2 internal keel frames which I glued in 90 degrees to the hull bottom. Then I started adding the frame ribs. Not once removing the model from the building board, it had to be kept flat and true.

    The next thing I did was to plank the internal thrust tube and this gave the hull immense rigidity because it is made in place and glued through the frames.

    The fan: Electric ducted fan and speed controller

    This is of an 80 mm internal diameter. 12 blades. Producing (so they say) just under 7 lb of thrust. Running on 22 volts. The speed controller is 120 amp capacity - 24 volt. This is, bearing in mind, all new to me (new territory that is).

    Couple of things for anyone new to the ducted fans which I learnt was - what you suck in the front - you can only push out the back of the fan that is ๐Ÿค“ . The air is not expanded into a gas as in a real jet engine.

    The other thing is you can reach (what they would class as a terminal velocity) where if you are lucky enough the fan will be travelling at the same speed as the air it is pulling in. You have to think about this one a bit - as the fan cannot go faster than the air it is pulling in.

    We will leave it at that for a moment.

    Couple of pics.

    Oh, this is a picture of where the servo is mounted for the rudder and it drives the rudder through an aircraft snake.

    John

    ๐Ÿ’ฌ Re: Technical data
    5 months ago by ๐Ÿ‡ฌ๐Ÿ‡ง BOATSHED ( Lieutenant Commander)
    โœง 51 Views ยท 1 Like
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    That's very impressive. Some years ago, my brother and I went to the very last Sandown Model Show. There was a man demonstrating a small jet engine it was wicked, the type they use in model planes. I said to my brother I would like one of those and build a model Bluebird and mount it in that. Sadly I don't think my modeling skills are quite that good. I don't think either that there was a model kit out on the market that you could buy to build. I am not sure that there is even one out there on the right scale to take a jet engine anyway. But yours is awesome. as you say your speed is quite acceptable. but my reason for a jet engine is I am a speed feakaholick. I have built several model boats in the past where it says the largest engine is 7.5cc and straight away I stick in a 10cc, sad but that's me. my brother has said you can't do that but up to now I have never come unstuck and always got away with it and had great fun and performance from them. But I have blown the bottom out of an engine by adding the Nitro in the fuel up to 60% very costly on a ยฃ90 engine never went that far again. As I say I am a speed freak. No more IC engines left now as I have sold them all of and going brushless now. They have turned out to be faster than IC. But I only went down that way as there is nowhere left near me where you can run IC. I loved the thrill of when the engine got up to speed and came on pipe. I am a speed freak. So brushless here I come. ๐Ÿคฃ๐Ÿ‘
    ๐Ÿ“ Electric ducted fan Bluebird
    8 months ago by ๐Ÿ‡ฌ๐Ÿ‡ง JOHN ( Midshipman)
    โœง 106 Views ยท 25 Likes ยท 11 Comments
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    ๐Ÿ’ฌ Add Comment
    hi there, this is a project which I have been working on. It began as a feasibility study to see if it is possible to drive a scale model Bluebird with a ducted fan. As people were saying, the air intake required for the fan to perform at 100% and larger than the ones available on the scale Bluebird. That is why you see on certain videos and in model magazines, a stand-off style Bluebird, with a very large/over scaled air intake.

    So, this was my assignment. I achieved it - I would say by 97%.

    I overcame the airflow intake problem by manufacturing the canopy from some aluminium mesh and also either side of the canopy on the deck there are 2 openings which are covered in mesh. This seems to give me sufficient airflow for the fan. The fan is 80 mm diameter running on 22 volts and the model is 1/8 scale. It has been clocked by the satellite GPS (which is fitted onboard) at 31 mph which is quite acceptable in my books.

    John

    ๐Ÿ’ฌ Re: Electric ducted fan Bluebird
    5 months ago by ๐Ÿ‡ฌ๐Ÿ‡ง PeteJev ( Master Seaman)
    โœง 26 Views ยท 1 Like
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    Very impressive and stable even after a bit of turbulance.
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    ๐Ÿ’ฌ Re: Electric ducted fan Bluebird
    7 months ago by ๐Ÿ‡ฌ๐Ÿ‡ง ukengineman ( Leading Seaman)
    โœง 53 Views ยท 2 Likes
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    Well done, very impressive performance on the water
    ๐Ÿ’ฌ Re: Electric ducted fan Bluebird
    8 months ago by ๐Ÿ‡ญ๐Ÿ‡บ MouldBuilder ( Vice Admiral)
    โœง 87 Views ยท 2 Likes
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    Brilliant. I love it. ๐Ÿ˜ƒ๐Ÿ˜ƒ
    ๐Ÿ’ฌ Re: Electric ducted fan Bluebird
    8 months ago by ๐Ÿ‡บ๐Ÿ‡ธ Peejay ( Midshipman)
    โœง 101 Views ยท 3 Likes
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    The video of her at speed is most impressive!
    ๐Ÿ’ฌ Re: Electric ducted fan Bluebird
    8 months ago by ๐Ÿ‡จ๐Ÿ‡ฆ Rowen ( Captain)
    โœง 102 Views ยท 2 Likes
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    Well done.
    Have long toyed with making that model but have never plucked up courage.
    After seeing your success am feeling revigorated.
    Might be dropping you a message shortly so can pick your brain.
    Rowen
    ๐Ÿ’ฌ Re: Electric ducted fan Bluebird
    8 months ago by ๐Ÿ‡บ๐Ÿ‡ธ River Rat ( Captain)
    โœง 99 Views ยท 4 Likes
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    Very nice! Well done shipmate! RR
    ๐Ÿ’ฌ Re: Electric ducted fan Bluebird
    8 months ago by ๐Ÿ‡บ๐Ÿ‡ธ jumpugly ( Captain)
    โœง 92 Views ยท 4 Likes
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    I have always been fascinated in the efforts to build a ducted fan Bluebird and you gone and done an outstanding job John!!!
    ๐Ÿ’ฌ Re: Electric ducted fan Bluebird
    8 months ago by ๐Ÿ‡ฌ๐Ÿ‡ง Mike W ( Leading Seaman)
    โœง 93 Views ยท 3 Likes
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    Nice work! Certainly looks the part at speed. Clever idea to make the canopy out of mesh to get the airflow. ๐Ÿ‘
    ๐Ÿ’ฌ Re: Electric ducted fan Bluebird
    8 months ago by ๐Ÿ‡บ๐Ÿ‡ธ ToraDog ( Captain)
    โœง 100 Views ยท 3 Likes
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    WOW๐Ÿ˜€ Beautiful๐Ÿ˜€
    Go thing that your had corralled all the Swans to the other side of the pond!๐Ÿ˜‚
    ๐Ÿ’ฌ Re: Electric ducted fan Bluebird
    8 months ago by ๐Ÿ‡ฌ๐Ÿ‡ง Doogle ( Commodore)
    โœง 106 Views ยท 2 Likes
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    Wow ๐Ÿ‘
    ๐Ÿ’ฌ Re: Electric ducted fan Bluebird
    8 months ago by ๐Ÿ‡ฌ๐Ÿ‡ง luckyduck ( Midshipman)
    โœง 107 Views ยท 4 Likes
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    Awesome - brilliant piece of work that from afar could be the real thing. Just need to scale down the surroundings and nobody would know!


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