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Thread: Mirage build - redone thrust frame

  1. #1
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    Default Mirage build - redone thrust frame

    Hi. I thought I'd conglomerate my various threads into just the one.







    I am going to mount the lift engine like this to see what happens. It seems to fit nicely - I will put additionaly heat shielding between the cylinder head and the polystyrene. if anything the extra metal work might strengthen the front planing surface a bit.



    I have a set of 3z blades for the (now) wrong direction - how well do they work in reverse? can reverse direction ones be bought?







    447 on its frame - i will bolt the rubber mounts to the fibreglass with penny washers on each bolt, then put some nuts +washers on to lift them up.







    the flexy joint.



    I took the engine to Bill Sherlock this morning to remove the old gear. I randomly came across his website - I had no idea how he was connected!



    Now selling poly belt reduction drive (check for sale forums!)



    More tomorrow *hopefully*



    Toby

  2. #2
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    Default Re: Mirage build

    you'll need the correct direction blades, they don't work in reverse, the only issue with mounting the lift engine below the fan is access for servicing and what happens to fuel lines and electrics when the blades shatter - just a thought



    the rest is looking good



    Tony

  3. #3
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    Default Re: Mirage build

    Plus is the lift engine underwater when afloat?

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    Default Re: Mirage build

    Blades shattering shoudln't be an issue? There would only be two wires and the fuel line, so these could be put through a metal tube if necessary.



    Water was the main issue. I am going to put essentially a tank around the engine. Not sure how though. The hot parts are high up, so any plough-ins shouldn't get it too wet! Thin ally sheeting riveted then resinned should do the trick i hope.



    Exhaust is the other issue - silencer would have to be in the plenum, but how would it be affected if i put an extension onto the silencer output? I won't be just letting the exhaust gas go into the plenum though.








  5. #5
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    Default Re: Mirage build

    I noticed you are using a centerflex coupling on your 503.Thats fine but make sure you belt is alot tighter than normal. On starting your engine it may not pull through because of osolation between the engine and fan.I have had this problem in the past! I use my mirage for racing and cruising and as a F1x yours would be great. However putting that lift engine near salt water may need some more thought. Great hull looking good.




  6. #6
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    Default Re: Mirage build

    Don't forget that serious amounts of water as spray can come in through the fan. Your tank will need to cope with that.

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    Default Re: Mirage build

    for all the hassle its worth, and the potential problems you will see with the engine mounted in the plenum. why don't you just get a set of blades the proper rotation?

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    Default Re: Mirage build

    Hello,

    Im no expert but always look on the downside.

    How close would the engine be to the hull.

    In the event of hitting something at the front planing surface would it make contact with the engine.

    A causing damage to the engine resulting in no lift

    B causing the engine to move damageing the fan resulting in no lift

    C causing the hull to split rather than flex.



    Just a thought



    Craig






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