Tuesday 10 September 2013

Yellow Butterfly, Red Butterfly, Red Savoia S13

My Flying Flea, aka Pou du Ciel, could only crash and is converted to the Yellow Butterfly by the additional of thin oval discs at the rear wing. It still didn't fly. On the last test, it flew up to 6-10m high and dived straight down. Maybe I should return the 2S500mah battery to the battery compartment and make 3-5degrees of incidence on the front wing. Alternately, I am considering modifying it to have elevators at the rear wing.

The depron quick build is the Red Butterfly, it flew, barely.
It has the flying characteristics of a butterfly, Muhamad Ali's word: 'float like a butterfly', except that I have a hard time doing the flight corrections. The 3S800mah battery is already placed immediately behind the firewall and it is still tail heavy.

Instead of fixing nose weight, or ripping the elevon/rudder servos and mount them forward and replacing the pushrods, I shall add some interesting structure ahead of the CG. It should both be interesting and also serve as nose weight.

Two ideas, the Augmenter and the Feeler.

The Augmenter
Cut out of McDonald's salad cover, this circular cowl is gracefully curved and let us call it the Augmenter!

So called because, it shall:
  1. increase the thrust from the propeller, 
  2. render the model stall proof because at extreme angle, it will still provide lift at the nose, enabling the model to hold higher AoA,
  3. enable the model to land vertically on its tail,
  4. enables the model to have slower and more constant airspeed in climbs and dives,
  5. looks cool because relative to the 7" propeller, it is so huge (I think I shall spray it silver).
The weight increase will be very slight, only a few grammes.

Will it work? I don't know, even if it is detrimental to the performance or if it makes the model more difficult to fly, it is interesting.

The Feeler
How about some flexible wire/rods stuck on to the nose, so it looks like the pair of feelers of a butterfly?
I could add small plastic balls at the extreme end, for safety (hahhahah) reasons, both visually and practically.
Wow, am I a show-off?
Don't care, so long as I am having fun.

Will it work? There might be complications, but having long feelers infront of the propeller disc must be good at least for the CG as it presents long moment arms so I can use the least weight to bring forward the CG.

With all these ongoing projects And yet, I'm thinking of doing a quick build of a red-white Savoia S13.
Go Outerzone, there's a peanut plan.
Let's see, the mods I would make:
  • sheet balsa everything, fuselage, tail, wings, nacelle
  • engine nacelle integral with the top wing
  • engine nacelle to house the aileron servo (only the top wing has ailerons), esc and motor (to use the Emax motor currently in the Red Butterfly)
  • carbon fibre strips as cabane struts with nylon fishing line riggings (the 0.33mm thick type)
  • Both upper and lower wings, with the cabane struts, engine nacelle, demountable in a single unit from the fuselage boat, the esc lead and servo lead is to be connected before fixing the single unit (dowel and screws or rubber banded?) 
  • right under the lower wing, in the fuselage (the boat/pontoon), will be the elevator and rudder servos.
  • Forward, in the nose will be the receiver and 3S battery
  • The top of the nose, until the cockpit, shall be removable, this means nose to rear of the trailing edge of the lower wing is open for inspection, modification and reinforcement
  • elevator and rudder pushrods shall be the 0.8mm wire running in nylon tubing
How difficult can this be to build, fly and maintain? If I get sick of biplane flying, I can just do up a wing with motor pylon mounted and fly it as a 3 channel monoplane model.

Why a flying boat? Well, a flying boat is supposed to ROW (Rise-Off-Water), so there's no wheels around, and maybe one day I will fit a motor powerful enough to be able to take off grass! ROG, Rise-Off-Ground or more appropriately Rise_Off-Grass!



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