B & B Aircraft Sandpiper

Single seat single engined high wing monoplane with conventional three axis control. Inverted V tail. Pitch/yaw control by elevon; control inputs through stick for pitch/roll and pedals for yaw. Integrated flaps and ailerons. Wing braced from below by struts; wing profile; NASA high-lift airfoil double surface. Undercar¬riage has three wheels in tricycle formation: spring steel, inflatable tires. Aluminium tube framework, without pod. Engine mounted below wing driving pusher propeller.
Two struts either side of the pilot support the high wing, and there are no rigging wires, the absence of a kingpost making for a very clean design. Wings are foam blanks fitted to aluminum spars and heat-shrink covered with Dacron. The maker says that 3 inch (7.6 cm) square section tubing is used for the structure, which as a result can handle 9 g. It has a single large diameter vertical wing support between pilot and engine.

Engine: Rotax 38 hp
Prop: 52”
Wingspan: 30’.
Wing area: 150 sq.ft.
Empty weight: 243 lbs.
Gross weight: 625 lbs.
Fuel capacity: 5 USG.
Fuel consumption: 1.5 gph.
Load factors: +9, -6 G’s.
Takeoff roll: 100’.
Climb rate: 950 fpm.
Landing roll (full flaps): 60’.
Stall speed: 20 knots.
Max cruise: 63 mph.
Available as: plans and materials; plans and all parts kit or complete flight tested aircraft.

Barton Sylkie     

Wayne Barton of Northglenn, Colorado, began doodling his dream ship and the general outline of his dream ship began to take shape. Barton began at the bottom, sketching in plenty of ground clearance to swing a big prop and a stabilator. It need at least a Lycoming O-320 and a retractable trigear. The first few degrees of rotation of the primary retract handle break the over-center gear brace arms, and after about 10 degrees of travel, the springs change their action; instead of holding the gear locked, they begin to pull the gear up, with the springs providing 95 percent of the effort.

In retracting the nose leg, the steerable nosewheel linkage neutralises, and when you’re up and flying, kicking the rudder pedals only actuates the aerodynamic rudder. After about 120 degrees of travel, the retract handle locks into a socket, and a microswitch automatically causes a solenoid to, lock each gear into the full up position.

Going the other way, as when putting the gear down for landing, moving the down gear handle into its socket actuates a gear-locked indicator light on the panel when the fast few degrees of down handle rotation applies pressure to the gear over-center brace arms. Gear doors are attached to the legs and open or close automatically.when you raise or lower the gear.

The stabilator was designed with a 12-degree rotation capability around its single spar, which is built in two units, the right and left sides being joined with a splice tube which serves as an attach point for the counterweight. An antiservo unit gives the stick backpressure feel, and is also linked to the cockpit pitch-trim wheel. All linkage is hidden inside the fuselage and fin area.

Barton went to dual controls, with brakes on the left side only, and the mechanical flap handle was attached to the same pivot unit as the primary gear retract handle. A Cessna-type pitch trim wheel is located between the two seats, with an additional aileron trim hung on the forward face of the main spar near the pilot’s right knee.
Three fuel tanks are located inside thefuselage, with a 28 Usg fiberglass main tank aft of the passenger seats below the baggage compartment. An engine-driven fuel pump transfers fuel from the main to a pair of header tanks back of the firewall under the panel, holding a total of 14 gallons. From there the fuel is gravity-fed to the carburetor.

Barton used a Minicab wing of 24 feet 11-inch span and 110 sq.ft. area, fully cantilevered, with a 15 percent rib chord at the root. This provided adequate, depth to hide the gear when retracted. The chord depth tapers to 10 percent at the tips, with a uniform twist of two percent.

The Emeraude fuselage provided an ample cabin width of 42 inches, and a sliding bubble canopy provided easy access and good visibility. Retractable steps allow entry over the flaps at the wing root area on either side. These were a few extras that only added 20 pounds to Barton’s design empty weight of 1000 pounds.

Barton came in for under $8,000 in 1979 dollars, mainly by building everything from raw materials, except for a few ready-made essentials like the engine, wheels, nuts, bolts and gauges. Airframe construction was of sitka spruce; some hardwood for high shear stress points; plywood; chromoly 4130 tubing; and some aluminum alloys.

In building the fuselage, Barton used the standard right and left side frame construction method, the sides turned over on the work table and positioned properly for fitting the wing attach bulkhead, seat back bulkhead and fin spar. Cross braces were cut to fit, ply gussets added, and the fuselage turned right side up again, for adding turtle deck, fin.

Next came the nose gear well framing, firewall, stabilator and rudder, which had three ball-bearing hinges, with a conventional external rudder horn. No counterbalancing was required.

In building the Minicab wing, Barton beefed up the spar center sections to prov ide a 9G ultimate load factor for a 1200-pound airframe. The gap contour between flap/aileron and wing proper was modified for better aerodynamic efficiency, and the entire wing skinned with plywood. As for the gear, Barton says: 1t evolved as a sort of hybrid, part Beechcraft, part Mooney, part Barton.”

Internal compression springs were used for shock absorbing, together with an internal oil damping action using the same shaft with attached piston for rough-field operation,

The engine is enclosed in a conventional fiberglass cowling with the nose gear door hinged to the aft part of the cowl. Canopy framework is of wood construction with the acrylic plastic windows held in place with ordinary glazier’s points and silicon rubber.

To finish everything off Barton went to Dacron covering and Randolph’s dope.

In April 1975, Sylkie One, passed final FAA inspection, and her maiden flight was on May 2, 1975.

Engine: Lycoming O-320 / 150 hp.
Prop: Wood, fixed pitch, 72 in dia.
Wingspan: 24ft 11in.
Wing area: 110 sq.ft.
Fuselage length: 20ft 7in.
Height: 7ft 1in.
Empty wt: 1020 lbs.
Max wt: 1650 lbs.
Econ cruise: 10,000 ft 6.9 gph, 182 mph TAS.
Vmax (17,000ft): 234 mph TAS.
Stall: 48 mph IAS.
Climb: 1800 fpm.
Service ceiling: 19,000ft.

Bartoe Skyotë / Tech-Built Skyotë / Skyote Aeromarine Ltd

Tech-Built Skyotë

The Skyotë is a plans-built aircraft design dates back to the 1970s when it was created by Pete Bartoe. His goal was to create a plane that was affordable and easy to fly, with enough performance to be competitive at the International Aerobatic Club’s Intermediate level.

Bartoe met his design goals, and the delightful handling qualities of the Skyotë were praised by R.A. “Bob” Hoover in a flight report that appeared in the December 1976 issue of Sport Aviation.

The Skyotë uses a biplane planform, with a swept wing. It has a single seat, tube-and-fabric fuselage with an all-aluminum structure, and fabric-covered wings stressed for +9/-6 G. Weight and performance qualify it for the Light Sport category, and it uses a Continental O-200 engine.

The airplane is not a typical plans-built homebuilt. Bartoe did not design it with homebuilding in mind; his intention was factory production.

Because the goal was good aerobatic performance on minimum horsepower, each part is optimized for its purpose. As a result, parts are made from six gauges of aluminum, seven gauges of steel, and three gauges of stainless steel. The 7.2-degree wing sweep looks and performs great, but is hard to build. Brackets in the wings have left, right, top, and bottom positions, so one part can have four different bending configurations depending on what wing location you’re building. The mounting clips for the wing ribs have an acute angle on one side and an obtuse angle on the other side.

Although the Skyotë didn’t make it to production, Bartoe sold around 100 sets of plans. Twelve airplanes have been completed from the original plans, but about half of those were factory prototypes. The first, N8XX, first flying on 23 April 1976 powered by a 90hp Continental C-90F.

John Roberts was one of those people who ordered a set of plans. But when he received them, it didn’t take long to discover why only five builders had completed their airplanes after nearly 40 years—the drawings were incredibly complicated, and the skill level required was way beyond the ability of most potential builders.

Roberts decided to use modern technology to get his plane, Skyotë #88, into the air, as the Tech-Built Skyotë.

Knowing that Pete Bartoe had mathematically calculated all Skyotë dimensions to an accuracy of three decimal places for all three axes led John to see the combination of Skyotë plans and 3D CAD as a better way to have the Skyotë he wanted.

While learning Geomagic 3D CAD software, John selected parts from Bartoe’s drawings and created CAD models for each part. Over time, he ended up with more than 150 drawings depicting nearly 600 parts that needed to be fabricated for the Skyotë.

The software’s 3D modelling feature produces assembly drawings that are very easy to understand. By assembling the parts in “virtual space,” you can be sure that all of the parts will fit together correctly.

The CAD program also confirmed the accuracy of Bartoe’s original calculations. With a total of nearly 1000 pieces in the Skyotë and tens of thousands of holes, John discovered only one small error—a single hole was off about 1/32 inch. That discrepancy has been corrected.

To convert his .dfx files into parts a waterjet cutting process cut about 600 flat metal parts to make fittings for the wings and fuselage.

In the wings there are three compression struts between the front and rear spars, along with drag and anti-drag wires, and one tubular brace out at the tip.

The fuselage is welded steel tube construction with fabric covering. The standard gear uses bungee shocks, and by all reports, it works just fine. A shock strut that uses urethane donuts with various amounts of stiffness for the Tech-Built Skyotë is simple to adjust the amount of bounce, and the donuts are unlikely to wear out.

Gallery

Engine: Continental O-200, 100 hp
Prop: Catto 2-blade fixed pitch
Wingspan: 20 ft 0 in
Length: 16 ft 3 in
Empty weight: 656 lb
MTOW: 975 lb
Fuel capacity: 15 USG
Full fuel payload: 229 lb
Cruise: 90 kt
ROC: 1200 fpm
Landing speed: 40 kt
Stall: 38 kt
Takeoff roll: 300 ft
Landing distance: 550 ft
Load rating: +9 G/-6 G
Cabin width: 20.25 in
Seats: 1

Engine: 118hp Lycoming O-235-K2A
Wingspan: 20’0″
Length: 16’3″
Useful load: 297 lb
Max speed: 157 mph
Cruise: 112 mph
Stall: 44 mph
Range: 207 mi
Seats: 1

Jerry Morris has over 20,000 flight hours. He was an Air Force C-130 pilot, flew civilian charter for several years, and then was a captain for Delta Air Lines.
I had an opportunity to fly a Skyotë, and what a blast it was.
Climbing in was really not bad, even for an old guy like me. Left foot in the step on the fuse and swing your right leg up and over, and into the single seat. There is a very sturdy handhold conveniently placed in the center of the upper wing that really helps here. Sliding down in, the cockpit rails are tight, but once settled in, they barely rubbed on my shoulders, and it was really comfortable. The low windscreen proved to be very effective, and the visibility all around was open-cockpit superb. All the controls and switches were very accessible and required no stretching or reaching. Very nice.
The little Continental O-200 had already been run this day, so mags on, throttle cracked, mixture in, and crank away. A couple blades later it was up and running. Everything in the green and off I went.
Visibility was actually pretty good taxiing. Slight S-turning was all that was needed. Toe brakes were hardly needed, and the steering through the rudders was very effective but not twitchy. Runup is standard, and I was ready to go.
The Skyotë is a light plane and even with just 100 hp accelerated quickly. By the time I had the power all the way in, the tail was up and ready to fly. Directional control was not an issue, and I was off. Climbing at 70 brought a solid feel with not too high a pitch attitude and excellent visibility. Once out of the pattern, I went up to a higher altitude to play a little.
This thing turns on a dime. Rudder is required, but not much. I led with just a touch, then aileron, and around we went. Same for rolling out. After just a couple turns, it became second nature. It has very light controls, both roll and pitch, and fingertip pressure is all that’s needed to fly. It was easy to trim with the electric trim on the elevator, but there was not a lot of pitch change to trim out with speed changes.
Slow flight at 60 is easy. With power off and holding the nose up, I started feeling the burble in the low 40s. There was an easy break, and the times I stalled it, it wanted to break ever so slightly to the left. A touch of rudder with center stick, though, and I could keep it level. It was very docile.
Steep turns, wingovers, and hammers are all textbook simple and very honest. All the while I enjoyed the great visibility through the wings that seemed to be placed just right for seeing through.
Back to the pattern with my dancing shoes on. In typical carbureted fashion, carb heat on abeam the numbers. I used 70 on base, and once established on final back to 60 indicated. There’s pretty good drag, so with my usual picture, I carried a tad of power down final. Bleeding off over the numbers in the flare, I three-pointed it at just over 50 indicated. Directional control was great, and visibility just out the side of the cockpit was typical taildragger, with not much over the nose. Carb heat and power in, and off I went again.
Next I tried a wheel landing. Same pattern with just a tad of power to keep the speed up for the touchdown. John’s gear is forgiving and wheelies will be simple with just a few tries. Visibility is great with the tail up, and the rudder is very effective. I went up one more time to the final landing, which was basically a repeat of the first. It three-points very nicely and tracks true down the runway with minimal rudder required. Touching down around 50 produces a nice short landing roll, then back to the barn I went, wearing a big grin.
This little ship is a joy to fly, with fingertip controls that are well balanced. Stable in pitch and roll, it didn’t wander around while I was enjoying the view. And what a view! Flying wires and wings were everywhere, but they were easy to see through. In steep turns, looking behind the top wing gives a great view. On the ground, it’s very honest with pretty good visibility. This is the type of plane that’s made for early-morning or late-afternoon jaunts in the country. And, it’s rumored to do great aerobatics.
Thanks so much to John for letting me fly his pride and joy.
—Jerry Morris

Ron Schreck Flies the Skyotë
Ron Schreck, a current IAC competitor and judge, to give us an evaluation of the aerobatics.
John’s home field is at Rock Hill, South Carolina (KUZA), just a 15-minute flight from my home at Gold Hill Airpark, North Carolina (NC25). I arrived on a calm, clear morning in late October. With temperatures in the mid 50s, I was glad I brought along a leather jacket, scarf and gloves.
John gave me a quick introduction to the simple VFR cockpit. Startup was routine and taxi was uneventful. After a brief runup I rolled out to the centerline of Runway 02. Even with the Catto cruise prop, the Skyotë was airborne before I had a chance to wander far from the centerline. I’m guessing that about 400 feet is all it took to take to the air! I found the climb to be a bit lethargic due to the cruise prop, and I would certainly recommend a lower pitched propeller for those interested in serious aerobatics. John tells me he gets a 10-knot boost in top speed with the cruise prop.
Once at altitude I put the Skyotë through some aerobatics. With no inverted systems and lacking dual seat belts and/or parachute, I avoided negative-G maneuvers. Elevator and rudder are quite responsive throughout the flight envelope. Entry to spins, right and left, was a simple matter of pulling power, waiting for the stall (which comes quickly due to the inherent drag) and applying full left or right rudder for a clean entry. Recovery was rapid, with slight opposite rudder and releasing back pressure. The responsive rudder and elevator also make the Skyotë a champion at snap rolls! I found that about 70 knots is the sweet spot for snap entry. A quick tug on the stick, rapidly followed by generous rudder, and the Skyotë eagerly snaps in either direction quite rapidly. The sweep of both upper and lower wings undoubtedly contributes to such great snaps!
Loops must be quite tight as the airplane decelerates quickly when the nose comes up, and you can find yourself out of energy at the top unless you pull with at least 3.5 or 4 G’s at the start. Here again, a climb prop would help out. Aileron rolls are a two-handed affair in the Skyotë, as the ailerons become quite heavy as airspeed increases. The aircraft rolls nicely, but the stick pressure required is not in keeping with the light pressures required for pitch and yaw control. I would like to see if the addition of spades to the ailerons would help. During non-aerobatic flight, the heavy ailerons do not seem to be so obvious.
Landing is pretty much a non-event. You will likely lose sight of the runway through the final turn, as it is blanked out by the upper wing. It will come back into view on final, and visibility over the nose on final and throughout the flare is no problem. I did a wheel landing on the first pattern with no issues. A three-point is another option, and I found that the tailwheel can touch down first without really trying. John did caution me to carry just a bit of power through the flare to avoid an excessive sink rate as the speed rapidly drops off with the throttle closed. Elevator and rudder control are positive in all landings.
For some serious aerobatics you would want to add inverted systems and dual ratcheting seat belts. A parachute would be required for IAC competition. There is little room for a backpack parachute, and pilots with long torsos may have trouble finding a seat-pack ‘chute that will allow you to get low enough in the seat. A chest-pack ‘chute may be a reasonable solution. Some experimentation with different parachutes and/or some modification to the seat may be in order.
Overall, I found the Skyotë to be a docile airplane that packs a lot of fun in a very small package. It is certainly capable of flying IAC competition aerobatics at the Sportsman level and even at the Intermediate level in the hands of an experienced pilot. My thanks to John Roberts for letting me enjoy his ride.
—Ron Schreck

Barry Souricette

Designed by Michel Barry to keep construction costs to an absolute minimum, the single seat Souricette will fly with as little as 15 hp.

Engine: JPX 425, 15 hp
Wing span: 9 m
Wing area: 10.1 sq.m
MAUW: 200 kg
Empty weight: 95 kg
Fuel capacity: 20 lt
Max speed: 140 kph
Cruise speed: 110 kph
Minimum speed: 40 kph
Climb rate: 2.5 m/s
Seats: 1
Fuel consumption: 5 lt/hr
Plan price (1998): 1000 Fttc
Kit price (1998): 22 000 Fttc

Barrow Bearhawk LSA

The prototype Bearhawk LSA N289EH had a Continental A65/75 engine, with an empty weight of 728 lb, with an aluminum prop and no electrics. Barrows estimates that 750 pounds is a realistic empty weight for a builder who works hard to keep the airplane light. With the LSA maximum gross weight of 1320 lbs. (in the utility category), this 2-place LSA has a very respectable useful load. Barrows has said that the airplane is really designed for a max gross weight of 1500 lbs (in utility category), so there is a built-in margin of safety for those who do not have to fly under the LSA rules. The Bearhawk LSA utilizes 4130 Chromalloy tube and fabric along with all-aluminum, flush riveted wings.

The Bearhawk LSA can take off in as little as 200 feet and climb at 1500 ft. per minute and then level off and cruise at 120 mph sipping only 5 gph. Barrows reports an economy cruise speed of about 110 mph sipping only 4 GPH with the Continental C-85 engine. With a 30 gallon tank that gives you over 7 hours in the air. Not many vehicles can do 110 mph only consuming 25 miles per gallon. If you want to get there a bit faster, you can push it up in cruise to 120 mph burning about 5 GPH.

The cabin width is a spacious 31” wide and 97” long. The Bearhawk LSA can be flown with the windows open for taking those perfect aerial photos.

Prices and contents of the Bearhawk LSA kits and components (2014):
Standard QB Kit – $30,000 (requires some welding)
Includes: Quick-build Wing Kit
Standard Fuselage

Deluxe QB Kit – $36,000 (no welding required)
Includes: Quick-build Wing Kit and Deluxe Fuselage Kit

Quick-build Wing Kit $15,500 These Wings are sold in an advanced level of completion. The top skin is fully riveted. Fuel tanks are included as are the ailerons.

Standard Fuselage Kit – $15,500 – Some welding is required but the fuselage frame comes fully welded with all of the major attachment fittings welded – unpainted (includes landing gear and motor mounts) Also includes Horizontal Stabilizer, Rudder and elevators as well as control sticks and rudder pedals.
Deluxe Fuselage Kit – $21,500 – The same as Standard Fuselage but has all the tbs and the frame is primed and painted. Includes all pre-cut sheet metal, doors, and frames, fiberglass nose bowl, tail spring, seat frames, instrument panel blank, etc.

The prices and contents of the kits and components (2014):
QUICK BUILD KIT $40,500
The Quick-Build Kit is on the FAA 51% approved kit list.
Because the airframe is largely fabric covered and because of the way the FAA constructs its definition of the 51% rule, there is no actual structural fabrication to be done other than completing the riveting of the top skin. This is left partially open so the builder can access and install certain components.
Although all of the wing control surfaces are almost ready to be installed, the builder must install the hinges first and then install them, which is part of the 51% program. The same thing is true of the tail, landing gear, control system, etc: the components are finished but must be installed. Assembly and installation not fabrication.
The Quick-Build does not include windshield, tires and brakes, covering/painting materials, seats, upholstery kits, cables, pulleys and hardware.

Bearhawk LSA

For 2013 – included with the Quick Build Kit
Complete set of plans, with serial number (Note: If you have purchased plans separately, the kit price will be reduced by $295.)
Fuselage completely finish welded, no welding required. Ready for stringers, cover and systems installation.
Landing gear and tail, completely finished, ready for cover and installation.
Control system completely fabricated, ready to install.
Wings finished, interior primed, with only the top skin which is already drilled and dimpled and ready to be riveted.
Control surfaces assembled, ready to be installed/covered.
Wing Struts with end fittings ready for drilling/installation.
Fuel tanks ready to be installed (aux tanks optional).
Motor mount ready to be installed. Choices are Lycoming 0-320/360, 0-540 and Continental 0-470.
Firewall and boot cowl, ready for trimmimg and assembly (not drilled).
Utility door and float attachment points standard.
The frames for all seats are included. Builder will fabricate seat pans and upholstery.
Wing tips
fuel caps
trim wheel w/chain
aileron cable guards
Flap/Aileron rod end bearings (10)
gascolator
clear windshield (tinted or UV block extra)
Gerdes brake master cylinders (one set)
Wing tie down rings
Aileron bellcrank bearings (4)

Builders of the Bearhawk LSA can purchase the plans and can purchase some sub-kits or components.

Bearhawk LSA
Engine: Continental, 65-100 hp
Wingspan: 34 ft
Length: 22 ft 3 in
Wing area: 170 sq.ft
Gross weight: 1200-1500 lb
Height 3 point: 75 in
Empty weight: 750+ lb
Fuel capacity: 30 USG
Vne: 140 mph
Landing speed: 30 mph
Cruise speed: 100-125 mph
Takeoff roll: 200-400 ft
Fuel burn: 4-6 USG/hr
Range w/res: 650 miles
Cabin width: 31 in
Seats: 2 tandem
Cabin length: 97 in