Dakota Cub’s Extended Slotted Wing

Willard Rich

Flight security is a thing all pilots converse about. They are living it, accept it, and normally hope to pick out it in their day-to-working day lives in the aviation entire world. For the Tremendous Cub fanatic, the Extended Slotted Wing from Dakota Cub presents pilots the opportunity to boost their protection margin as properly as boosting the climb efficiency of the aircraft.

Visualize traveling your Tremendous Cub at a high angle of attack with the airspeed indicator examining 20 mph, then rolling into 60-degrees of bank and initiating a climbing spiral whilst deciding on a electrical power environment that is significantly less than whole throttle! That is the usual exhibition that sells the Dakota Cub Extended Slotted Wing. The next most talked about high quality of this wing is the potential to have comprehensive flight command authority at large angles of assault. No extra soft controls, plopping it down, or wing fall on stall.

Mark Erickson, the founder of Dakota Cub, started his mission in the 1990’s. All he preferred was a Cub rib. Nothing at all from Piper was out there at a acceptable price tag and due to the fact the Piper ribs were being so fragile, he decided to develop his individual. He used fashionable-day know-how to an previous Piper wing that was initially created for the YL-14 liaison variation of the J5C Cub. The YL-14 wing was a slotted wing. According to Erickson, there had been only 14 of these aircraft created just before the stop of Environment War 2. They were exclusively engineered for quick consider-offs of 100-toes and climbs with significant angles of assault. There are only two of these even now in the air these days – one particular in Spain the other in Nebraska.

The Dakota Cub Prolonged Slotted Wing has numerous variances when when compared to the original Cub wing and the L-14 wing for that issue. Erickson revised the primary Piper US35B airfoil employed for the L-14. He produced a customized “T” formed extrusion with the exact same proportions that when utilised in making a truss-design and style rib, is lighter, less difficult to do the job with, and more strong than the unique wing. Erickson attained a STC for the new wing in 1993.

Erickson’s new rib only provides seven lbs to the pounds of each original Piper wing. The new wing has been structurally analyzed to in accessibility of 2,200 lbs, even so, the STC boundaries the gross weight to 1,750 lbs for the authentic wing or 2,000 lbs for individuals wings outfitted with the Wipaire Just one Ton Cub STC. This artificial reduction will hopefully be transformed in the long term. In the intervening years, Erickson has developed ribs and lots of other components that are FAA PMA-ed for all rag-wing Pipers. Erickson was granted the STC for the complete-length foremost edge slot in 1998. This slot aids maintain the boundary layer of airflow at slow speeds. On top of that, Erickson engineered a squared off wing and bought rid of the tip bow giving the wing an more 6% surface area spot, enhanced the flaps which benefits in 44% a lot more flap space, and pushed the ailerons outward 23-inches to the edge of the wing. He phone calls it the “Extended Wing.” The squared wing provides about 8 lbs to the unique Piper wing.

Introducing a slot to the Extended Wing adds a further 9 lbs for each wing, but the amplified security envelope from which to fly is well worthy of the trade-off. The flight properties of the squared-off and slotted wing, which Erickson calls the “Prolonged Slotted Wing”, is the most important gain and emphasis with regard to alternative of wings to involve in your Cub venture. The Extended Slotted Wing is the best accomplishing wing supplied by Dakota Cub. It has a 135-inch slot, a squared-off wing with 102-inch ailerons, and a 90.25-inch flap. Dakota Cub also features the regular Cub wing and a squared-off wing without the need of the slot.

The Extended Slotted Wing is simply just a safer wing. It permits a greater crucial angle of assault, slower stall velocity, and virtually eliminates the unexpected reduction of elevate as opposed to a straight wing. It delays the separation of the air flow from the wing area, consequently aileron authority is taken care of and in many instances the only signal of a stall will be a better-than-regular price of good. This phenomenon lets the sink charge of the aircraft on method to landing to be controlled by electrical power on your own enabling a much more exact landing stage without concern of a wing stalling or falling off on one aspect. The wing also has an enhanced roll amount owing to the ailerons getting extended to the end of the wing.

If you want to take whole benefit of the Extended Slotted Wing on your Tremendous Cub, then it is encouraged to put in a 3-inch gear extension. The gear extension will permit the sluggish pace abilities of the wing to take comprehensive influence on landing. Greater tires will deliver for this as very well. Short gear coupled with little tires will outcome in tail wheel 1st landings and a acquire-off run that is lengthier than optimal due to the fact it is much more tricky to obtain that higher angle of assault.

The end final result of all this innovation is a Cub that has improved climb efficiency, far better sink manage, slower landings, and a considerably larger margin of basic safety. A wide-physique fuselage from Airframes, Inc functions an prolonged fuselage, and when mixed with the bigger command surfaces and the slot, a pilot can fly at a 45-degree nose-up perspective, land at 25 knots, and continue to have a wing that hangs in the air.

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