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  1. Thread: Prop pitch

    by Joan Walsh
    Replies
    7
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    179

    Ooh, only about $1000 I believe, plus the...

    Ooh, only about $1000 I believe, plus the approval costs; a mere snip for a 912 owner :-)

    On a practical slant, I reckon the 151x107 would give a bit of extra cruise at the cost of a bit of STOL...
  2. Thread: Prop pitch

    by Joan Walsh
    Replies
    7
    Views
    179

    This perhaps?...

    This perhaps?
    http://www.ultralightnews.ca/Ivoprop/inflightultralightmodel.htm
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    Thanks for keeping this updated

    Thanks for keeping this updated
  4. Thread: 582 vs 912

    by Joan Walsh
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    17
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    1,476

    Bump... So the break even, by that...

    Bump...



    So the break even, by that estimate, is between 500 and 750 hours if you are buying new. For many microlight pilots that could be more than their whole flying career over many years.
    ...
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    Tom, I suspect in your closing remark you have...

    Tom, I suspect in your closing remark you have misunderstood. The speeds in the graph are IAS, not GS



    Two factors to consider there. First, I think the curves would be similar but stretched...
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    Well, my dearly-beloved took the TST up for a...

    Well, my dearly-beloved took the TST up for a jaunt yesterday and came back with three approximate data points for airspeed vs rpm. I would have liked two more, one each above and below this range...
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    Dead right you're missing something Martin......

    Dead right you're missing something Martin... what I think you're missing is that I'm not treating this with academic rigour, I'm experimenting and testing the result against intuition in an attempt...
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    Thanks guys, I agree too that the fuel difference...

    Thanks guys, I agree too that the fuel difference over practical flying speeds isn't worth the fret with a 4-stroke engine. It may well be a different matter with 2-strokes and I'll try it behind the...
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    Martin, Thus Mike's aeroplane flying at 90kt...

    Martin,
    Thus Mike's aeroplane flying at 90kt airspeed into that 30 knot headwind would have a groundspeed of 60kt; and by my gibberish that Tom replied to he would be wanting to fly ever faster and...
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    Tom :D Mike - doing a bit of crude and ugly...

    Tom :D

    Mike - doing a bit of crude and ugly calculating (not fit for publication) using your Rans 912 figures* and translating from mpg to ml/mile, and then putting in a range of headwinds from...
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    Hi Martin, yes, you've identified one of the...

    Hi Martin,
    yes, you've identified one of the unknowns - Rotax don't tell us. I'd have thought for power and fuel consumption calculations, the figures would be most useful in steady state under...
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    Non-dimensional. Use description of line, such as...

    Non-dimensional. Use description of line, such as mililitres per hour, or power in watts - a bit odd I know but its the way the numbers worked out for graphing in the same space :o

    At least it...
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    This could be gibberish and I've got something...

    This could be gibberish and I've got something else to do later so I haven't time to think it through, but thus far...

    I bunged the Rotax 503 data from the manual into a spreadsheet, but the fuel...
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    Ah yes, but... lets take an extreme case, but not...

    Ah yes, but... lets take an extreme case, but not ridiculously so, to illustrate my point. When the headwind is a small proportion of my airspeed (let's not fret about IAS/CAS/TAS convertions and...
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    Optimising miles per litre

    We all know (don't we) that if gliding into wind it's necessary to increase speed beyond min sink speed to get the best range. There are relatively easy techniques to work out this best speed given a...
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    The trouble is that in a real world you can have...

    The trouble is that in a real world you can have 'clear' which is probably incomplete and thus inaccurate, or you can have 'complete and accurate' which is probably legalistic and obtuse (especially...
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    Ignore this button! DO NOT PRESS!...

    Ignore this button!
    DO NOT PRESS!
    http://mein-notruf.de/wp-content/uploads/2010/08/button4.png

    Apologies: feeling mischievous - mods please delete if it gets irritating.
  18. Thread: Pi day

    by Joan Walsh
    Replies
    1
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    343

    Pi day

    It seems the Americans call today Pi Day from their numbering system which gives March 13th as 3/14 (or 3.1415... 3pm on Pi day?).

    I think in the UK we should 22nd July as our Pi day.

    ;-)
  19. Hope there's more sucess in stopping or limiting...

    Hope there's more sucess in stopping or limiting this than we had with Southend.
  20. That reminds me of the popularity of an...

    That reminds me of the popularity of an environmental test chamber which I had the job of commissioning at work one hot summer back in the last century. One of the technicians would turn up with a...
  21. Indeed, Tom. there's a well established industry...

    Indeed, Tom. there's a well established industry selling nice-to-haves to us "rich" pilots.

    Matt the OP is learning to fly 3-axis microlights, which in today's money means enclosed, heated...
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    TST pod up for grabs

    We have an original style TST pod available free to collect. It was intended for use on a simulator project and has no provenance (ie we don't know which aircraft it came off) so would be of most use...
  23. Hi Try...

    Hi
    Try https://www.bmaa.org/files/til_045_ssdr_handbook.pdf

    I think it answers your questions.

    If not come back on here and we can all have some fun trying.

    Joan

    PS. I found the CAA's...
  24. Try...

    Try http://docs.fasvig.info/ACP/20160513-FASVIG-SouthendPIRresponse.pdf
  25. Very good point Wally; so I just checked. ...

    Very good point Wally; so I just checked.

    Unfortunately they have the same under General Aviation which as far as they're concerned is what we come under. See https://tinyurl.com/ya93hfgy
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