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CG/

PsyBorg

Wake up! Time to fly!
#2
If I had to guess between the weight of the motor and long nose vs the weight of the heavy wood boat tail Id say even split right at the base of the windscreen.
 

quorneng

Well-known member
#7
I would be more concerned about its inherent aerodynamic instability than the position of the CofG. Without some form of horizontal tail surface the wing will need significant trailing edge reflex.
After all it was just a movie prop.
 

Piotrsko

Well-known member
#11
If you're going fully scale, that horizontal nose surface is REALLY going to bugger up the aero unless you pivot it like a full flying elevator at which point it will act like a canard. As a canard, I suggest a CG about the LE of the main wing. I believe it also had a rudder somewhere around the trunk.

To really get a pig to fly without lifting surfaces, you need lots of vectorable thrust ie: about 2X pig weight. That however will be unfortunate for the pig surviving
 
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quorneng

Well-known member
#13
Josh Bixler made a pig fly
But if you look carefully it did follow basic aerodynamic stability rules.
As a low wing you will need significant dihedral on the wing for lateral stability as well as some form of longitudinal stability or with appropriate control surfaces added 'go tech' and use a 3 axis gyro stabilised system.
 
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#18
If you're going fully scale, that horizontal nose surface is REALLY going to bugger up the aero unless you pivot it like a full flying elevator at which point it will act like a canard. As a canard, I suggest a CG about the LE of the main wing. I believe it also had a rudder somewhere around the trunk.

To really get a pig to fly without lifting surfaces, you need lots of vectorable thrust ie: about 2X pig weight. That however will be unfortunate for the pig surviving
It had a horizontal surface fore and aft however, I feel both would be overkill. Trial and error. The best tool for inventors is failure. Also please watch the flitetest vid of the flying pig.
 
#19
If I had to guess between the weight of the motor and long nose vs the weight of the heavy wood boat tail Id say even split right at the base of the windscreen.

A thought, just make a frame for the wind scteen to allow air to pass through it as to lower the effect a solid wind screen would have on aero. Its going to need all the help it can get.