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  1. #11
    Co-Pilot Martin Watson's Avatar
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    About 75 knots I think.
    Yes there are 912 powered examples, but really that's too heavy. The 582 is more matched to the airframe, and Jabiru powered ones seem popular too. There are plenty about with the 503 as well.
    Martin
    BMAA 5370

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    Halibut (02-01-20)


  3. #12
    Training Captain Gentreau's Avatar
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    Quote Originally Posted by Halibut View Post
    Is that possible? Would be fun.
    Two more questions: what is the cruising speed and would a Rans take a 912?
    I can only speak for France, where you would just remove the spats and thin tyres and replace the main gear with bush tyres.
    The UK may require you to jump through some hoops to do that ....
    I'm sure someone can clarify that.
    The three most useless things in aviation:
    • The air above you.
    • The runway behind you.
    • The fuel in the bowser.


    Rule #1: Always tie your aircraft to the largest heaviest object available. The planet Earth meets these requirements and is readily available in all locations.
    Rule #2: The great thing about twin engined aircraft is, if one engine fails, the other engine always has just enough power to get you to the scene of the crash.

    Semper specto in clara parte vitae.

    .


  4. #13
    Trainee Pilot PilotPete's Avatar
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    Quote Originally Posted by Halibut View Post
    .
    would a Rans take a 912?
    looking at Wikipedia seems there were indeed versions made with a 912 - https://en.wikipedia.org/wiki/Rans_S-6_Coyote_II


    it woudl also seem some Googling offers answers on big wheels...http://www.ransclan.com/forums/archi...hp/t-3892.html

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    Halibut (02-01-20)


  6. #14
    Co-Pilot paultheparaglider's Avatar
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    Steve Slade has a 912 version that used to belong to Nigel Beale. I've flown in it with him from my 200m strip in South Wales up to Mona and then onto Ince before refuelling. Quite an ask to carry 2 people and a fairly full fuel load from such a short strip.

    It is a very capable aircraft. Steve's has done a few thousand hours, and has proved extremely reliable. It cruises comfortably at 80mph.


  7. #15
    Captain MadamBreakneck's Avatar
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    Quote Originally Posted by paultheparaglider View Post
    ... It cruises comfortably at 80mph.
    Ah, so about 70kt

    Martin, what's your go-places cruise in your Thruster Sprint? I did 65kt (75mph) in my flatback/jab edition though 55kt (65mph) was more economical by the hour.



    Back to just bimbling in the TST.

    No longer instructing - just pontificating..
    and now a Tai Chi instructor


  8. #16
    Training Captain Gentreau's Avatar
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    Quote Originally Posted by Halibut View Post
    .....would a Rans take a 912?
    Here's a couple of examples (sold) http://www.ulmoccasion.com/apps/search/?s=rans+912
    The three most useless things in aviation:
    • The air above you.
    • The runway behind you.
    • The fuel in the bowser.


    Rule #1: Always tie your aircraft to the largest heaviest object available. The planet Earth meets these requirements and is readily available in all locations.
    Rule #2: The great thing about twin engined aircraft is, if one engine fails, the other engine always has just enough power to get you to the scene of the crash.

    Semper specto in clara parte vitae.

    .


  9. #17
    Co-Pilot Martin Watson's Avatar
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    Quote Originally Posted by MadamBreakneck View Post
    Ah, so about 70kt

    Martin, what's your go-places cruise in your Thruster Sprint? I did 65kt (75mph) in my flatback/jab edition though 55kt (65mph) was more economical by the hour.
    About 5knots faster (ie 70knot fast cruise for covering the distance) in the Sprint than the flat back. But it's nice at 55-60 knots so I rarely cruise at more than 60.

    I'd always thought of the RANS as faster cf the Thruster, but realistically there is no significant difference I guess.
    Martin
    BMAA 5370


  10. #18
    Co-Pilot jpmasso's Avatar
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    would a Rans take a 912?
    I have seen one or two Coyotes with 912 for sale in Spain during the last years, so yes, though not a common engine in these planes. In my home field there is one Coyote but with an 582 engine, which is the typical one.

    Cheers,

    Josť Pascual


  11. #19
    Co-Pilot paultheparaglider's Avatar
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    Quote Originally Posted by MadamBreakneck View Post
    Ah, so about 70kt

    Martin, what's your go-places cruise in your Thruster Sprint? I did 65kt (75mph) in my flatback/jab edition though 55kt (65mph) was more economical by the hour.
    There is always a trade off between speed and consumption. Even the best tube and fabric microlight will have limitations. The advantage of a 912, or a Jabiru engine, is that speed and range don't have to be such a compromise.

    I have spent very many happy hours in a friend's Thruster TST back in the late eighties / early nineties - a machine I really enjoyed. However, it had a 503 which drank fuel once you tried to cruise much over 60 mph.


  12. #20
    Captain MadamBreakneck's Avatar
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    Paul,
    Very true, but be careful not to conflate engine performance and airframe drag. 2-strokes have advantages in many cases but fuel consupmption does indeed go up rapidly at higher power settings - the Rotax 582 is a classic for this. If you're flying a 2-stroke you really need to restrict high power use to take-off and climb. Optimal cruise will be at much lower revs. 4-strokes tend to have a flatter power curve and a flatter fuel consumption curve to match. The airframe drag curve (form drag plus induced drag) is what determines the optimum consumption (per hour) airspeed for the aircraft regardless of engine type, though the actual consumption values will depend on the engine.

    It's not without reason that go-places machines tend to have aerodynamically efficient streamlined designs whatever engine is fitted - eg Pipistrel ALpha and its non-microlight cousins.

    A read of this thread on the BMAA forum might be of interest (Optimising miles per litre)



    Back to just bimbling in the TST.

    No longer instructing - just pontificating..
    and now a Tai Chi instructor


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