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Archive for February, 2017
Posted by Old_Pilot | Feb 20, 2017 @ 07:18 AM | 6,790 Views
She died Saturday.....but I learned something about the limits of foam board.....I flew her successfully a few times, but on the last flight, I turned to make a high speed pass over the runway and when I leveled the wings and throttled up, I saw the fin buckle and turn almost sideways......she broke in half when she hit the ground..BUT, I learned that the tall slender (unreinforced) tail fin was just that...too tall and too slender....I've already addressed that problem..the fin failed diagonally from lower back to mid front. I've decreased the slenderness of the fin, and will add stiffeners, probably bamboo, to both the leading and trailing edges for their entire length. Kinda sorta reminded me of what paper does when you blow on it edge on.

Rev 2 this week....
Posted by Old_Pilot | Feb 16, 2017 @ 01:35 PM | 6,923 Views
She's a dream to fly......no bad habits

F4D Skyray (3 min 17 sec)

Posted by Old_Pilot | Feb 15, 2017 @ 06:21 PM | 6,896 Views
Rev 0 (the gray one) was doing pretty well on her maiden until the fan rotor let go and went through the side of the fuselage and part of the wing......had to cut her apart just to get the rotor out...so I built Rev 1...few minor changes......servos are let into the underside of the wing this time..almost 6 inches of battery (CG) adjustment.....three hatches..skids a little farther forward......
Posted by Old_Pilot | Feb 09, 2017 @ 09:18 AM | 7,016 Views
My friend "builderdude" inspired me to attempt this build.....his is balsa, this one is Elmer's board.

36" WS, KFM-2 wing/airfoil, 90mm Freewing fan, 1850 kv motor, 6S battery.....if I can get the shop warm enough, I'll try to get her painted today. Otherwise, I'll just fit the rest of the hardware and start masking....

The drawings and patterns have been revised to as built/as flown.........Continue Reading