skywagon8a
MEMBER
SE Mass MA6
What is the difference between a 'BCSC Rev 3 flap' and a stock -18 flap, besides more span?
He runs out of fuel using them to climb, doesn’t have the aoa at take off to use them, and 15mph slower. He’s comfortable with the airplane for sure. I have heard a lot of the legend guys took the slats off. I would imagine you can get in much shorter than you can get out? He did say it was safer horsing around, that was the upside. Just passing along what he told me.
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More chord, better hinge geometry, and leading edge vents.
Sorry for the pic layout. I took snapshots of a video Bruce sent me in 2018.
We compared same airplane with stock wing and Dakota Cub slotted wing and saw no difference in cruise. Installed Mackey slats on a Smith Cub many years ago and it slowed the airplane down in cruise a noticeable amount.Has anyone done a direct comparison between the "screw-on" exposed LE slats and the Dakota built-in slot? Performance and cruise drag in particular?
Thanks Steve, that is what I suspected the results would be.We compared same airplane with stock wing and Dakota Cub slotted wing and saw no difference in cruise. Installed Mackey slats on a Smith Cub many years ago and it slowed the airplane down in cruise a noticeable amount.
If you are going to do high AOA climbs you are going to need a fuel pump or header tank higher than the carb. 1/4 Right tank on a stock cub can be a issue if you climb long and hard enough. I know more than one pilot that is avoiding slats, just depends on how you fly.
DENNY
During the days when leading edge cuffs were all the rage, some had more droop than others. Those with the bigger droop had higher drag, losing cruise speed. From what I've seen, most of these current screw onto the leading edge slats would resemble those high drag cuffs even if they were fastened closed. This because their leading edges project well below the lower surface of the wing regardless of the opening of the upper slot.Has anyone experimented with pinning down the current variant of slats for cruise flights to see if speeds can be increased?
Standard length, square tips. I’m recalling flaps are extended about one bay, so about 15”, but I may be wrong on number.Johnny, are your wings standard Cub chord and length? Flaps standard or extended?
Isn't your fuselage longer than a stock -18? If so, a stock sized rudder would have more authority due to the longer leverage arm. That could be the difference between what you've observed and what your friend observed.He confirmed that and made a comment that the slats he’s seen run at a high AOA to the point the rudder becomes ineffective. I’d never heard that, and it doesn’t happen on my plane, but again, my plane has several other mods. More food for thought.
Also to help balance the larger heavier engines for CG control.I was told the primary reason for lengthening the airframe was to provide better trim and elevator control when slow, so that likely is about the leverage.
There's a couple of those BCSC's in Fairbanks. One's got the double flaps, the other the later single with LE slots. Haven't seen the second one in action yet. Very unique and well built aircraft. None on floats as that's my interest.
Gary