Hi,
I just returned from test flights of the new design of the
Do-It-Yourself (DIY) flying wing with the Kline-Fogleman modified, KFm2,
airfoil. This time it is a twin engine puller, or tractor, 75 cm
(approx. 30 inches) flying wing.
I've been working for quite a while on a DIY aerial platform. And this
time I created, probably by chance, a really good design. It is easy to
launch, very stable in the air, easy to land, and most importantly, - it
is quiet while cruising at altitude.
I published a small report article with photos and a video at:
http://ausleuchtung.ch/kfm2/kfm2-puller.php . In a short, 40 seconds,
video it is seen that when it flies at an altitude of about 100 meters
we cannot hear it.
The requirements which I try to achieve are the following:
- the cost of the airframe is about 5 USD
- the airframe could be built DIY in two-three hours completely
- excellent uncompromising flying characteristics
- capable of carrying a GoPro type camera
- only common motors and electronics, which could be scraped, being used
- the RC aircraft is quiet enough to be employed in urban areas
- fail safe, - in case of failure it does not drop, but glides
gracefully to land
- could be transported on a bicycle or e-bike
For the fist time, I see that it is practically achievable.
The puller means that the engine is forward of the wing. The puller, or
tractor, is much quieter than a pusher as the propellers work in
undisturbed air.
The idea is to create an affordable open-source DIY design which could
be used for mapping, aerial photography, journalism, surveys, etc. The
patents for KFm airfoil expired in 90s. The KFm2 airfoil is incredibly
easy to build, plus it has got excellent lifting characteristics.
Best regards,
Oleksiy
___
talk mailing list
talk@openstreetmap.org
https://lists.openstreetmap.org/listinfo/talk
