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Old Dec 12, 2014, 09:31 PM
Look, Listen, Learn
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Originally Posted by pecanpatch View Post
I have personally flown the KFM1 and KFM2 and I much prefer the KFM1

To me, the KFM2 moves the CG forward and it's already forward enough as it is!
Excuse my ignorance. But if the cg is forward, does that mean you need to add weight to the front to balance?
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Old Dec 13, 2014, 04:43 PM
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The extra weight of airfoil would shift CG forward, so would need to move battery back to compensate. Small planes have trim wheel, moves weight to adjust CG. I plan a glide test with no power to check it before powered flight. First order of parts came in, still waiting on foam to begin build.
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Old Dec 13, 2014, 05:20 PM
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No that's not right. The plane needs to be balanced about 1" in front of the CG mark on the plans with the KF on top.
With the KF on the bottom it didnt seem to shift.
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Old Dec 13, 2014, 07:44 PM
Look, Listen, Learn
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WOW 1 inch more. Was afraid of that, already glued my top KF on. Oh well, need to bring out the bigger battery then. Will test glide first when it's all together and adjust as necessary. I'll add a little extra to the front before flight....better heavier in front than back. ( learned that a long time ago.....good memories..... what a fun ride that was )
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Old Dec 13, 2014, 09:22 PM
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OK, good information! I asked before, on a 30 inch geobat, where is CG from nose with no foils on it? That gives me a starting point to work with, I figured about 8.5 inches. Foam due early next week, so I am ready to begin.
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Old Dec 13, 2014, 09:47 PM
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Originally Posted by General660 View Post
OK, good information! I asked before, on a 30 inch geobat, where is CG from nose with no foils on it? That gives me a starting point to work with, I figured about 8.5 inches. Foam due early next week, so I am ready to begin.
about 1/4 the diameter usually works out for a good starting point
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