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tangoalpha

Flap Angles

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Does anyone have an idea of the flap angles corresponding to flap settings in percentage?  For example, what is the flap angle for a 20%, 50% and 100% flap setting? The angle should be relative to either the root wing chord or the Water Line of the aircraft.  Also, what is the gap or spacing between the flap and wing for each of the flap settings?  I cannot find this information in any of the TOs for the H or J model.  Are the flaps the same for all the C-130 models?

thanks,

TA

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From 1C-130B-1

I would guess that every 10 percent is 3.5 degrees, that's using old math. I don't know how it would come out using common core math. Can't find anything on clearance. 

 

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It's not linear like that.  For example, at 20% you get more lift than drag, which essentially tells you the flaps move more aft than down.  You can see this when watching them.  From there, they start progressively moving down at a higher rate.  Watching them move from 50 to 100, you can tell there's more down movement than aft.  If they were a simpler flaps system which only pivots at a hinge point, then it would work out like that.  Unless someone has actually done some measurements, there is no way to extrapolate degrees for the percentage.

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My first question would be:  Are you trying to check the rigging on the flaps, or just wondering what each handle setting measures in flap angle? The only rigging measurements are at full up and full down flap positions.  Full down is straightforward; number of turns of manual extension crank handle until system bottoms out.  Full up has two elements to measure; number of turns of manual handle to bottom out "up", and the gap measurement between the upper flap surface and the wing trailing edge when the flaps are fully retracted using the hydraulic system, after you have properly rigged the flap motor switches to stop at the full up position (and, good luck getting an accurate measurement on most wings' trailing edges...think Ruffles potato chips profile...)  The intermediate positions are not actually measured.  The actual position/angle of the flaps when being used in flight, compared to the flap handle percentage markings, could best be described as "squishy", and changes slightly depending on whether the flaps were being extended or retracted to a particular setting.  Most crews put the flaps at a particular setting they need, and then tweak it to get the desired response from the aircraft anyway.  

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If memory serves, 0 to 50 is almost straight extension simply increasing wing area and lift. 50 to 100 increases lift through the slot to compensate for drag from the increased down movement. Don't remember any specific angle for a given postion

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