Designing and Building some EPP Flying Wings !
With all the new Super awesome EPP Foam Blocks that we got in stock, I want to build some EPP Flying Wings.
EPP Foam is great because :
A. Its strong yet flexible. So it doesn’t shatter and break easily. Can make very resilient planes that can take a beating
B. Its pretty light, and cuts with a Hot wire very neatly.
C. Its CA Friendly ! Yes ! Makes the builds very fast and light.
My Idea is to build 3 or 4 sizes of wings :
A. Micro Size : ~ 600mm Wingspan
For fun flying , light and small , maybe do some FPV too. I havent yet built such a small model yet but pretty inclined to do so now ! This would probably take one of those small Drone racer motors and use ~ 700-1000mah Lipo
B. Standard Size: ~ 1000mm Wingspan
This would be probably be the “standard” RC plane that will probably take the 28XX Motor, 2200mah Lipo and some FPV gear.
C. Large Size : ~ 1400-1500mm Wingspan .
For long endurance FPV, aerial Photomapping, lots of space for RC electronics, cameras, autopilots, pizzas and all .
Here’s a graphic I posted on Facebook today, lot of work that will be done in the next couple of months, in designing, building , test flying, improving, rebuilding, flying and finally coming up with models we can list on our website.
Flying Wings are awesome to fly. They are easy and quick to build, a breeze to fly ( when properly, usually pretty efficient, and small ones are incredible fun to fly around.
Though I have an extensive experience of designing and building Flying wings, whenever scratchbuilding, I start off with drawing the panels, and usually cross reference against one of the proven planes. In this case, I checked my layouts against:
– Ritewing Zephyr 2 and Zephyr 3 ( which I own and are terrific ) ,
– Vortex-RC Speedster and Speedster Pro ( our very own models )
– Ritewing Drak
– Multiplex Funjet
The more I look, the more I am tempted to experiment, build and test fly all of these.
Of course when designing I have to also take in consideration that i have 50MM blocks, and I need to optimise for, and also their size 1000x1200mm to avoid any wastage when we go into production.
These parameters determine not only the flight characteristics, but more importantly, the location of Center of Gravity (CG).
The CG of a Flying is extremely crucial, as the wings are absolutely unforgiving, if they are not balanced properly.
The best Tool for calculating the CG is available at : http://fwcg.3dzone.dk/
This tool takes in all the above parameters and gives the CG location which is pretty accurate and is a good starting point for first flights.
As the sweepback is increased, the CG shifts backwards. Thats the reason why Multiplex Funjet and Ritewing drak have so less sweepback ( Drak actually have forward sweep ) . This makes doe CG go up in the front, allowing more batteries and gear to be placed.
Lets go build the first plane . a 600MM Wingspan Mini Flying wing. Continue Reading here .