Test flight of Paul's Shrike today did not go to plan. Left leg collapsed during taxi test. Managed to fix that and get three greens (down and locked) by air pressure alone, but retraction still not working. Commenced takeoff roll, aircraft accelerated well but stuck to the runway like glue. More power fed in, more elevator fed in, nothing, nothing, nothing, LEAP! Not a good way to get into the air. Immediate signs of wild tip stall so killed the power and arrived back on the ground unscathed other than popped the mounts out of one main landing gear.
Apparently the BRIDI and the GREAT PLANES Shrikes were also notorious for tip stall. I see this model has no washout built into the wings either. The taper of the wing plan is also not the most stall refusing around.
Admittedly, the model was set-up with a lot of aileron throw - something I don't have on my own aircraft, so we'll change that for next time.
Also we will mow the runway. it wasn't bad today but could have done with a little haircut. A bit of wind on the nose would have been nice too.
Stuck to the runway seemed to be exactly like a ducted fan jet I had. It would not rotate nicely off the ground until it had quite a nose high on-ground angle of attack set to it (long nose leg). Zero angle of attack on some aircraft requires a lot of groundspeed to lift-off, and usually (like today) it results in a sudden ''un-stick'' - going from virtually nil angle of attack to a sudden great angle of attack in the air, which then turns into wild tip stall. This bird will take some tinkering me thinks, and me thinks it will not likely like slow flight!
So sorry to disappoint folks, no successful flight today.
Test flew my re-engined Dual-Ace. Put it into a right engine left rudder hammerhead stall and it whipped into a fully developed flat spin, power off, nothing, still spinning, both engines toΒ*full power, nothing, still spinning, still descending, oh crap! Full left engine and right rudder - just managed to get it to stop rotating and push into a vertical dive and into a both engines recovery about 20 feet off the deck. YOWZA it was close.