PHOTOS: ED VALLS
The tail feathers of Ed’s A4 (at left) look the part of a fleet-serving aircraft, and showcase the naked ribs of the A4’s rudder beautifully. As a test bed aircraft (above), Ed sized things for both a six-inch Byron fan and a five-inch Dynamax. The first flights were flown, as shown, with a Dynamax fan driven by a Scorpion
4035-630 Kv motor on 12S. As a non-ducted airframe, an intake ring (made from glassed foam), which is seen just to the left of the fan unit, is needed to smooth the airflow to the fan (or face a 35% loss in thrust).
that is set up to fly, so real thrust numbers, current and temperature increases can be measured, which translate directly to us. Af- ter all, a Habu 32 is a Habu 32, is a Habu 32, being the same in his hands, or ours. While I am on the subject of edfs and flying test beds, I have presented Ed Valls’ 88-inch A4 Skyhawk before, but I actually had the op- portunity to see it in September at The Greater Southwest Jet Rally—and it is big! The fuselage is very light, which makes this big foamie a real floater on landing, but easy to balance since the batteries and “other stuff” can be easily placed where they are needed. Sized for both a six-inch Byron and five- inch Dynamax fan unit, there is plenty of room inside. The maiden was done on Ed’s
PHOTOS: GREG MOORE
Mike Kulczyk’s FJ1 Fury (above),fresh from the paint shop, is looking very much the part of the Navy’s first jet fighter. David Reid’s BVM F-86 edf-arf (below), powered with the BVM power system on 12S floats on past. Excellent flight characteristics and scale looks make this a favorite of Greg’s.
Scorpion 4035-630 Kv combination on 12S. On his Falcon 120 conversion, this combina- tion puts out 15.5 pounds of thrust at 127 amps, but with only a 14-inch long tailpipe. The data following the maiden of the A4 (with a 41-inch long tail pipe) was 12 pounds of thrust at only 94 amps. Ed’s next step is to play with various tailpipe shapes/tapers to see if thrust can be increased to boost the Scooter’s slightly over 100 mph speed. All-up weight came in at a hair over 21 pounds, which is very impressively light for an airplane this size. Powered by two-year- old 12S 5000 Haiyin batteries, the maiden video can be found at:
www.rcgroups.com/fo rums/
showpost.php?p=26354230&postcount =955.
Also seen was Mike Kulczyk’s FJ1 Fury which had just come from the paint booth. Though the important “stuff” had not been put back into it (like landing gear so I could set it on the ground), it still looks the part of an early jet fighter in its Navy blue. Finally, I cannot resist David Reid’s BVM F-86 Sabre ARF. Every time I see this airplane fly it grows on me. Powered with BVM’s 12S fan and motor system it just works, and works quite well.
That’s it for this time around, so until next time: fly safe, and trust in thrust!
Upcoming Events
Jet Rally in the Valley Arizona Jet Rally
FLYING MODELS Nov. 2–3 Nov. 22–24
Kingdon Park Airfield, Lodi, CA Superstition Airpark; Mesa, AZ
www.deltamodelers.org www.azmodelaviators.com
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