Sonnyj

G'Day Ya'll
While looking around the net for motor info, I came across several Jabaru's for sale. I'm just wandering why we cant use one of these apparently fine built engines in a gyro.
I really don't know ANYTHING about these motors, other than they're made in Oz, and they are expensive, tho no more dear than them Soob or Rotax power plants every one uses.
The only one I ever saw was at Mentone. It was a pusher mounted on a fixed winger. Seemed to work very well in that he could get off the ground in around a hundred feet, and it was a very pretty engine.
Just a thing bouncing around in me head.

Sonny

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The most dangerous thing about gyro flying is when you think your no longer a student

Aussie_Paul

The Oz gyro boys have already tried it Sonny. They get too hot at the low airspeeds we fly at. They really need a redive, BUT they are built to be out front of a quick fixed wing.

Aussie Paul.

Sonnyj

Howdy Paul
Don't take me wrong mate, not wanting to be a smart arss, but I just won't except that nobody in Oz can't design and build a set of cooling cowls, and addapt a redrive to one of them Jabaru motors. I'm just thinking it would be great if some one built an ALL Oz gyro, say a Firebyrd, or a Rosco.

Sonny

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The most dangerous thing about gyro flying is when you think your no longer a student

Fencing Wire

G'day Sonny,
Been done. A dude up the top end of Queensland had an article in the ultralight mag a few years back. Had the Jab motor fitted at the Jab factory, where they sorted the cooling ducts as well IIRC. I think his name was Don McMillan (also IIRC). I also believe that the Broken Hill boys have dabbled with them as well. Tim can probably fill you in (metaphorically speaking, of course).

You mastered that machine yet?
Cheers

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FW

I can't remember what I did for brains before shit became popular.

disco

Jabiru engines don't need a redrive because the prop gets mounted direct to the crankshaft. The engine only spins at aircraft revs like a cessna etc up to 3000 or there abouts, probably less.

The are only aircolled unlike the rotax and soobs. So i can understand the heating problem. Although they are fully cowled in jabiru aircraft so you would think that being out in the open in a gyro would nearly be equivilent.

Dean

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Beware the flying Horny Commander....Wah ha haar....

Birdy2

Before i found the 914 lyn on the side of the road, i was lookn at putn the 6 pot Jab on the wasa, but soons i said it was go'n ona gyro, they said nup, wont work, not enuff airflow. I quized um bout cowling, but they wouldnt hear it.
Buggered if i know.???

mceagle

The engine speed that the Jabaru runs at to achieve its horsepower (something like 3300rpm) means that it can only turn a short prop, which severly limits low speed thrust. There was no allowance from the manufacturer for any output drives to be mounted on the engine, meaning that fitting any of the available re-drives would have added considerable expense and complexity.
The cooling problem was solved using reversed cowls and exhaust fans driven from the prop flange.
The machine was nice and light but the performance with the small prop was marginal.

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Tim McClure