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BobbyPaulk(at)comcast.net
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 Posted: Sat Jun 29, 2013 12:48 pm Post subject: CG |
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p { margin: 0; }p { margin: 0; }p { margin: 0; }p { margin: 0; }p { margin: 0; }p { margin: 0; }Just got back from the airport measuring and weighing ( 2 ) Zodiac 601's. I am aware that the datum can be anywhere you want it. I used to put them at the tip of the spinner so all the figures would be positive. You would still have to subtract or add from their datum line to get one different from theirs as well as the distance to the forward limit would also change.
If you use the leading edge of the wing near the fuselage you must subtract roughly 35mm from the 270mm forward limit so the new forward limit should be 235mm aft of your datum. The forward sweep makes that much difference ( about 1 3/8" ).
This could easily put you out of the rear limit with light fuel and a heavy passenger. Your fuel burn makes the CG go aft. Most Jabiru engined 601's will have to takeoff with reduced fuel to stay under gross weight with a passenger. Some of them will have to land with at least 6 to 12 gallons on board depending on the weight of pilot and passenger to keep from going aft of the rear limit depending on where their CG is located.
By the way we have ( 5 ) 601's in this area and the 3 we compared all have the left wheel 5/16" to 3/8" further forward than the right. I would be willing to bet that if you pop a chalk line on the floor from the fourth nose rib out on the wings and measure to the main wheel axles that there would be a little bit of difference - not that it matters : )
Never did get the answer to my question which was where can I find Zenith's latest info on location of the datum line.
Never mind I found it. http://www.zenithair.com/zodiac/xl/data/xl-w&b-2-page.pdf
Thanks to all who answered.
Bobby
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bobemery51(at)gmail.com
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| Posted: Sun Jun 30, 2013 3:03 am Post subject: CG |
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Speaking of c of g with the 601/Jabiru 3300
Mine moves aft as mentioned with passenger and reducing fuel.
I definately feel horizontal sensitivity increase if I have a heavy passenger as fuel burns off.
Does the 650 have a mount that moves the engine further forward?
I heard that the later mount for Rotax moved it further forward, I am wondering if the Jab fw mount did the same?
Would seem to be a good idea, can anyone confirm this?
(Now 140 hrs going great- Perth, West Australia).
Bob
Sent from my iPad
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