WIGs
09-12-2002 | 03:57 PM
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There are several oddity models that aren't far from being overpowered WIGs, thus able to fly well out of ground effect at normal model weight. And example is the flying Porche which was featured in RCM many years back. (that's one reasonit has a delaye roll response at normal flight altitude)
The approach I'd take (if I were you) for your project would be for to learn to fly a conventional R/C aircraft, then build the prototype WIG model, and stay light until you trim it and verify correct CG at a good altitude. Then start adding payload.
I'd imagine the roll control would need to be done with a large differential to totally preclude adverse yaw.
The approach I'd take (if I were you) for your project would be for to learn to fly a conventional R/C aircraft, then build the prototype WIG model, and stay light until you trim it and verify correct CG at a good altitude. Then start adding payload.
I'd imagine the roll control would need to be done with a large differential to totally preclude adverse yaw.
09-17-2002 | 07:55 AM
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Pretty cool stuff.
On the practical side for models, we're mostly limited to around 50 pounds and wingspans of even 20 feet are extreme... which implies flying a big model remotely at less than half of treetop height. Sounds very challenging operating a plane in that mode and not rewarding to most modelers since you wouldn't even have a good view of the aircraft.
Good luck at any rate!
On the practical side for models, we're mostly limited to around 50 pounds and wingspans of even 20 feet are extreme... which implies flying a big model remotely at less than half of treetop height. Sounds very challenging operating a plane in that mode and not rewarding to most modelers since you wouldn't even have a good view of the aircraft.
Good luck at any rate!
09-18-2002 | 08:16 AM
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RE: what "differential" control is...
On many models (and some full scale aircraft) the ailerons are setup to have more upward deflection movement than downward deflection. This gives a larger loss of lift on the side where the aileron moves up, than the increase on the opposite side.
The upward deflecting aileron can decrease drag on that side (usually noticed at low defelction angles, and with asymetrical airfoils) The downward deflection of an aileron not only adds lift, but increases drag. At low airspeed, the drag changes can be a larger factor than the lift increase, making the aircraft turn opposite to the desired direction.
An extreme of this is easy to demonstrate with a scale Cub model (or simlar) when taxiing near stall speed... such as right before lift-off or just after touch-down. The "barn door" ailerons can cause so much adverse yaw that the rudder can not compensate.
Adverse yaw effects with most models will be functionally inversely related to airspeed. In actuality...the aileron effect is still basicly (pitch angle has an effect...) the same, but higher speed makes the rudder/fin more effective, and thus you just don't se the yaw as much.
On many models (and some full scale aircraft) the ailerons are setup to have more upward deflection movement than downward deflection. This gives a larger loss of lift on the side where the aileron moves up, than the increase on the opposite side.
The upward deflecting aileron can decrease drag on that side (usually noticed at low defelction angles, and with asymetrical airfoils) The downward deflection of an aileron not only adds lift, but increases drag. At low airspeed, the drag changes can be a larger factor than the lift increase, making the aircraft turn opposite to the desired direction.
An extreme of this is easy to demonstrate with a scale Cub model (or simlar) when taxiing near stall speed... such as right before lift-off or just after touch-down. The "barn door" ailerons can cause so much adverse yaw that the rudder can not compensate.
Adverse yaw effects with most models will be functionally inversely related to airspeed. In actuality...the aileron effect is still basicly (pitch angle has an effect...) the same, but higher speed makes the rudder/fin more effective, and thus you just don't se the yaw as much.
