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Monday, December 30, 2013

Dollar Store Foam board Flying Wings

Published on 28 Mar 2012
There are many versions of the beloved flying wing. This particular model is made from a single piece of Dollar store foam board, pre-covered with packing tape, and assembled with hot glue and two-sided foam tape. Its mission is to go very fast with a medium-sized motor and 3-cell battery pack. It is easy to build, with only two straight wing cuts, two hinge cuts, and two score-fold-glue joints for the vertical stabilizers. The scale and style factor is pretty humble in order to keep the weight down and the build simple, but it can be made to look relatively cool enough with some nice colored packing tape. Wingspan 21", length 19", AUW 500-650g, speed 60-75 mph. I have used 1100kV and 1500kV 70g, 330 watt +/- motors with 8x6 APC props and 3-cell 220 0mAh battery packs and gotten very respectable performance. A 2200kV with 6x4 and a 130 0mAh pack was 400g and pretty quick as well. One could use a higher kV rating and/or cell count for faster speeds. 64 mm EDF works very well too, mounted on top, with a paper cup thrust tube. These can be very fast and nimble with a roll rate over 1000 degrees per second, so I would recommend having at least intermediate skills and low rates to start. Launch 1/2 throttle at 30 degree up-angle and trim while at altitude. The EDF does well with landing gear (nose wheel, tail skids).
Flying wing/delta wing C of G calculator:

Friday, September 13, 2013

Hobby King Vampire

Construction sequence

Durafly D.H.100 Vampire Mk6 EDF Jet w/retracts 1100mm (PNF)

Test Flight

Saturday, August 10, 2013

Resurrected 50 year old Tiger Moth

Once flown with Galloping Ghost RC control and a throttle equipped indestructible ENYA 19 engine for power. The model was scratch built from Aeromodeller free flight plans and was modified for 3 channel radio control.
 Now converted to brushless electric power and now mounted on a pair of light weight styrofoam floats for lake flying. 

Preliminary trials were disappointing because the EMC 40 size motor did not rev-up sufficiently to develop maximum power for water take-offs.. After much experimenting such as, changing propeller sizes, reprogramming the ESC setting. changing the battery voltage:;all to no avail, the problem remained unresolved. Until a fresh look at the problem; fully one year later, revealed that on spool-up the left hand threads joining the front housing, carrying the bearing to the cylinder to which the permanent magnets are attached were backing off; allowing the magnets to drag on the poles. This unscrewing continued until the motor bound up suddenly and completely, making the problem and solution obvious. The solution to the unscrewing problem was to weld the threads, by running a bead of CA glue around the joint. I could have used LocTite but I did not have any at the time and, I could not imagine why I would ever need to undo this joint in the future, so permanently gluing the components was a good choice.
Taxi Trials: