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Quote: Originally Posted by yak55x |
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Wouldn't it be worth it to get rid of 3 to 7 servos, power managers, battery weight ect? |
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I think if you're looking to save some weight, this probably isn't the right area. You'll always need a power manager of some sort, against the - dry - weight of the model, servo's weigh next to nothing and given their torque output (even at 4.8v, better yet at 6v) I'd be very nervous of control surface flutter. I've got 2 x ganged 8511's on each aileron on my 40% Extra 3M. Hypothetically, if you took that back to one servo because of your 'spade' you're asking for confetti. A spade significantly increases the potential of control surface flutter and if you don't have enough output torque from the servo/s to combat this, you could use your spades to dig your crankcase out of the ground. Battery weight? LiPo's / NiMH are so much lighter than good old NiCads and again, to forgo a battery that will satisfy potential amp draw from xx number of digi servo's in a snap or whatever - that's just crazyville. No???
The effectiveness of control surfaces is determined by so many things, no need to list. If you're really hung up on making a more efficient aileron, start to get your head around the different shapes of a wing's cross-section, cord thickness, leading edge shape and so on. Upon understanding how differently shaped wings disturb airflow and produce lift you could start messing around with aileron design.
You might decide to design a assymetrical mirrored concave aileron. That would seriously have an effect on airflow and subsequent control inputs - and could turn out to be a complete waste of time.
Why not investigate mixing in differential elevators to assit on the rolling axis?? Easy to put in / out, vary the %'s... You might find you've created a smoother roll - now that's worth investigating? yes/no?
Even going for a lesser pitch prop (eg. 34 x 12 to a 34.5 x 11), to increase the area of the thrust cross-section.
And list goes on forever. Next year, it will be variable pitch props (already investigated over 20 years ago by your US legend,
Hanno Prettner)
But I do have to admit, spades do look pretty cool!!
Best of luck!
Sleeping