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FB Jets 2,3 M Dolphin CoG

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FB Jets 2,3 M Dolphin CoG

Old 08-09-2021, 12:15 AM
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zh588
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Default FB Jets 2,3 M Dolphin CoG

Hi Guys

Has anyone completed one of the latest 2.3m FB Dolphins? This new kit is much lighter than the original, I have finalized my build but have a concern about the CoG, the manual gives it at 291mm from the LE at wing root and the calculator I have gives it at 265mm. It does appear extremely light on the nose at 291mm, Thanks.....
Old 08-09-2021, 05:13 PM
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tp777fo
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Is this the Dolphin or the Dolphin S?
Old 08-09-2021, 06:29 PM
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RCISFUN
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If it is 2.3 M wing span than it is the large Dolphin.
C.G. is determined by dimensions and not all up weight of the airframe.

The C.G.in the manual works quite well.

Old 08-09-2021, 06:46 PM
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Fei Bao Jets Dolphin build thread by RCISFUN
See post #33 for the CG calculations I used for the manual.
Old 08-09-2021, 08:36 PM
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zh588
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Thanks for your comments,

Yes it is the large Dolphin, I followed the build thread, it was concise and intuitive, thanks for the effort. My comment about the weight was I wasn't sure where they manged to shave off the excess weight - more aft or forward. I'll use the 291 mm as a datum and maiden slightly forward of that and work back. Thanks again.....
Old 08-10-2021, 04:18 AM
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It is a wonderful jet. Balance as stated. Use as much full flap as you can get. Add 1/4in crow with full flaps. After you get it trimmed for normal flight and at a near landing weight use your flight modes to get it trimmed for landing. Full flaps/crow and just a tad more than 1/2 throttle. trim it for hands off level flight. When trimmed properly it will maintain altitude and speed. To land, just slightly reduce throttle it will descend. Carry a little throttle to about 3 ft above the runway.

My landing sequence is... throttle idle, 1 potato 2 potato gear ,1 potato 2 potato 1/2 flaps, 1 potato 2 potato full flaps, 1/2 throttle. You are now at approach speed. Turn final and use small throttle adjustments to control glide path.. Carry the throttle to about 3 ft above runway.. I've had 2 Dolphin L and a Dolphin S. I love them!
Old 08-10-2021, 04:32 AM
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Appreciate the advice, Looking forward to the maiden as I get the chance. I'll keep you posted.......

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