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Keenaviator

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Posts posted by Keenaviator

  1. Wonder why so many Jabirus change hands so quickly all the time?

    Maybe because there's a lot of them. They are well designed, economical, don't rust and lots of people have them for a long time and are in no hurry to change. I built (finished building) mine several years ago. It's my eighth powered aircraft. If I were to change to another aeroplane, I'm stumped as to what would do better for my needs. Laurie

     

     

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  2. Mines been on about 3 years and it's going really well. Jabiru did a fair bit of development work on this prop and tried carbon but found it to be too stiff and caused resonance/vibration problems. The fibre used in their composite prop is I believe pretty standard glass fibre which has a bit more give. That said I had a Patroney composite prop on my Jabiru powered Corby Starlet and had no problems with that - and still no issues with it's new owner at West Sale. Laurie

     

     

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  3. Hi..was hoping to fly into Rainbow beach in RV 7 on Sunday back Monday to meet some friends paragliding. Does anyone have any updates on the strip? Ray the contact above has not answered phone/messages so far today so may be out of date?

    I've been there in a Jabiru J430 (with a paraglider in the back). Very soft sandy surface. We let the tyres down just to get rolling and just managed to get away. That was on 500 X 6 tyres.

     

     

  4. In my experience, nearly every engine I have had suffer from total piston destruction, has suffered from piston overheating.The remainder were destroyed via heads falling off valves, or ingestion of turbocharger metal after compressor turbine failure.

    The scores in the bore of the Jab engine indicate to me, piston scuffing, caused by the piston overheating, and associated ring jamming, caused by the overheating.

     

    The authoritative advice from engine components manufacturers is that you should never, ever remove weight from pistons via drilling. This only causes stress risers where the drill hole is.

     

    Weight should only ever be removed from pistons via machining.

     

    One must always be aware, also, that many pistons (even cast ones) are heat-treated to improve their life and performance, and using the likes of a belt sander to remove material from pistons is highly likely to affect any heat-treatment, as the use of a belt sander creates intense hot-spots very quickly.

    And the common thread for failure, OverHeating!

     

     

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  5. There is one at LTV LaurieAs you say beautifully built and finished off

    I went for a fly in it with the owner and flew it

     

    It is the 8m wingspan model

     

    Compared to my Sierra without trying to sound bias I found it very stiff and heavy in roll (which being the 8m wing compared to the 9 m wing model) and it flew quite nose high in s/l flight and to me didn't handle the turbulence anywhere near as well as mine

     

    Another pilot friend also went for a fly in it and commented that the Sierra was a much nicer aircraft to fly in his opinion

     

    I'd still have one no doubt about that but I certainly prefer the flying qualities of mine compared to it

    I'd be happy to have one as a gift too Alf. I'd sell it, buy a J230 and pocket the change.

     

     

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  6. Just bear in mind that Dennis bought one of the first D-Motors from the production line. Now that two years have gone by, we hope that D-Motor have sorted out many of the teething troubles.

    Sounds oddly familiar :)

     

     

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  7. How high is the paraglider at the point of release?

    It depends on the reason for the tow. For thermalling 1000' could be sufficient or less it you town into a good one. The people who tow for the purpose of SIV (unusual attitudes) tow up to 3500' plus, ie aerobatic safe height. Early training might only be to a few hundred feet.

     

     

  8. I have a paragliding tow endorsement. Normally a 'payout' winch is used and that's what appears to be in use here too. The comment that people involved towing would probably not be compliant typical of ignorance. Towing is very popular in the Deniliquim area where several record flights have taken place. I think Kari Ellis, current world no. 2 female Paraglider pilot, flew close to 400 km from there last year. The record flights usually take place in November early in the season.

     

     

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