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Unfinished Business. Kit Tolliver 12 Can a one-woman crime wave settle down and find contentment and happiness in the arms of a nice surburban lady in Kirkland, Washington? Order Now. About the Book. Unless, of course, she figures out what do do for an encore… Share this: Click to email this to a friend Opens in new window Click to print Opens in new window Click to share on Facebook Opens in new window Click to share on Twitter Opens in new window Click to share on Pinterest Opens in new window Click to share on Tumblr Opens in new window.

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So preventing traffic jams isnt just good for your sanity, its good for the environment. Length: Tail surfaces are W-inch sheet balsa. The wing uses "double jig-tab" construction that allows the wing to be built on a flat surface with the correct washout and dihedral. Kit includes an adjustable 40 to. Two rolled sheets of full- size plans and a superb page instruction manual are provided.

The formers are then keyed into notches in the fuse bottom to lock everything together in perfect align- ment. This design makes it practically impossible to install a former incorrectly. The fuel tank was installed next. I did not like the idea of permanently installing the tank without an access hatch, but I did so anyway, I figured I could easily cut a hatch in the underside of the fuse if and when I needed access to the tank.

Patriot's re The F-1 5 Eagle, the most engine is s recently introduced jet, is performarn in fact the easiest to fly. It Its construi offers exceptional slow- all-balsa at flight stability, and, hence, that of the is the best first jet for the advancing pilot who has mastered the aileron trainer, in a nutshell, the F is the simplest to build and the easiest to fly of the trio. Great Planes notes that this very fast aircraft is much more m Simpson.

Reviewer Jim Simpson commented that this plane offers "jet- like speed with good sta- bility. Choose the F if you want an easy-to- build, easy-to-cover and easy-to-fly jet -like sport plane with rugged fixed gear that can take a pounding. It can be viewed as an advanced trainer jet Choose the F or the Patriot if you want optional retracts, more power and still 1 more high-speed, jet-like performance. What you end up with looks like three fuselages glued side by side.

After installing most of the top and bottom sheeting, I tem- porarily set the servos and engine into place so that the nose wheel and throttle Six MK bombs from tbe optional armaments kit are shown mounted under tbe wing. They also say, 'if you can fty a trainer you can han- dle this jetr I must say f I was a bit skepti- cal when I took this awesome-looking plane to the flying field for the first time. The Eagle tracked extremely well with- out any rudder input, I let it build up as much speed as the runway would allow, then i smoothly applied a little up-elevator-—and then a little more— until it was finally airborne.

Once In the air though, it climbed out nicely with the wings perfectly level. The landing went just like the instruction book said it would.

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The aerodynamic design of the F gives it a flying quality not often found in WO models. As I applied up-elevator to raise the nose and slow the plane, the fuse started to lift. Once the plane entered this "floating'' stage, It was still very controllable and slowed down for a very gentle landing. The trick to making smooth, slow landings is to use the elevator to slow the plane earlier than usual, allow it to enter the floating stage and then use the throttle to regu- late its rate of descent. High- speed passes and victoiy rolls were very impres- sive, I didn't notice any instability in the high- speed maneuvers, and no trim changes were required as l changed speeds.

The plane can be flown really fast and is very responsive at high speeds. Application of rudder at high rate made the plane roll rather than yaw. As the F-1 5 darted around the sky, it was hard to tell it wasn't a ducted-fan let. Stall and snap maneuvers are not its forte. It flies inverted with almost no down-elevator. The plane is most sensitive along its roll axis, is less sensitive in pitch and is almost insensitive in yaw.

There was a time when engines coming from Taiwan were not on a par with those coming from Japan, Italy, Germany and other countries. Times change, but initial perceptions don't. I was care- ful to mark the cylinder head and connecting rod, so I could sw w the back for reassembly pur- poses. My first question concerned the cylin- der; it definitely was nickel-plated brass — not ABC aluminum piston with a brass, chrome-plated cylinder.

The box and the instructions state that the ,36 is an ABC type engine. Aluminum pistons with brass, nickel-plated cylinders func- tion very similarly to the ABC variety, but they don't last as long, A chrome-plated cylinder can outlast several pistons. The Magnum Pro. It was nice and free below the ports while transitioning to an interfer- ence fit above the transfer and exhaust ports. Thunder Tiger explains this phe- nomenon in their general operating instructions: "When the engine runs, the cylinder of the engine expands due to the heat of.

The top of the cylinder becomes much hotter than the bottom. The ABC-type cylinder liner has been precisely machined so that when the engine is at its optimum running temperature, the sides of the cylinder are straight and the pis- ton can travel freely up and down," 1 would only add that this procedure is intended to maintain good combustion gas seal at operating temperatures. Although the ABC system works and provides unprecedent- ed indicated cylinder horse- me for evaluation, I wondered if it war- ranted devoting 20 to 30 hours of hands- on appraisal time to it, then I opened the box.

But let's get to the good stuff; take it apart and see how the Magnum Pro com- pares in materials, construc- tion, quality of machining and fit. The Allen wrench intended for removal of the head and backplate metric cap screws was the wrong size. Fortu- nately, I had one that fit. The engine disassembled easily. In those days, extra air was directed to the power, there is a problem with heat trans- fer and cooling with the top of the cylin- der. The slip-fit mentioned earlier doesn't allow efficient heat transfer to occur to the Another view of the Magnum Pro. Notice the remote glow-plug heat -system connector in place.

The poor mechanical contact forms a thermal dam similar to a high resistance in an electrical circuit. The McCoy. The McCoy holder of all the D-speed records of the era was a ringed piston engine. The primary route for the piston to cool is through the rings to the cylinder. Since the cylinder had to cool The idea was to maintain mechanical con- tact and prevent the thermal dam from interfering. Unfortunately, there were two problems with this system.

First, the aluminum crankcase expanded faster than the steel cylinder. Second, since the upper crank- case, with its cooling fins, cooled uneven- ly, it tended to become distorted, taking the cylinder along with it. If severe enough, the rings would fail to seal, allowing blow- close-fitting pistons. The cylinder head is expected to provide the majority of the heat transfer and cooling. The problem for the ABC setup centers on the piston losing its tight interference fit through the repetitious starting from ambi- ent to operational temperatures.

But consider this: if heat transfer APC 9. Wear because of start-up Rev-Up 11x7 5 10, 4 lb. Look Master Airscrew 11x7 6 9, 4 lb. Wind speed— 8 lo lOmph — 30 Hg. The ABC concept was developed so the piston and cylinder could expand similarly from ambient to opera- tional temperatures. Complications arise because the portion of the cylinder above the transfer and exhaust ports operates at a much higher temperature than the portion of the cylinder below these ports, This means that the upper portion of the cylinder expands more than the lower part.

To compensate for this, the cylinder is machined to a taper— larger at the bottom than the top. The piston actu- ally fits tightly in the upper portion of the cylinder when at room tempera- ture. Because of this interference fit, the first few runs of a new ABC engine are critical to its future performance. Even when you throttle back, the mixture may still be lean. Severe damage can and will occur from prolonged lean or under cooled operation. Save yourself the grief and expense; run your ABC engine on the test stand for a mini- mum of 45 minutes, 2 to 3 minutes at a time, with adequate cooling peri- ods between runs.

These are minor performance gains, best left to the experimenter. Use lube per- centages between 20 and 25, and your engine will stand a better chance of operat- ing beyond a few flying sessions. Use the nitro percentage for break in that you plan to fly with. Generally, the more nitro methane a fuel contains, the high- er the cylinder-head temperature will be. Higher cylinder-head temperatures mean greater expansion for the upper cylinder and, to some degree, the piston, tf you break in an engine with 5-percent-nitro fuel, it will actually be too loose when 1 5-percent- nitro fuel is used because the cylinder expands faster than the piston as tempera- ture increases.

A typical ABC-type piston and cylinder. To deliver maximum performance t it must be broken in correctly. Never run fuels with less than 20 percent oil. Again, the high tempera- tures are caused by a needle-valve set- ting that's too iean, or inadequate cooling, or both. Usually, an overheated, var- nished engine will give you notice that something is wrong.

Immediately shutting it down will generally prevent any dam- age to the cylinder.


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The metal-to-metal con- tact that results will destroy the piston and cylinder within seconds. Why use synthetics? The pis- ton is of the baffleless variety t which allows an efficient squish band and hemi- spherical combustion chamber. The glow plug is of the long-reach vari- ety.

The ultrasonic cleaning process failed to reveal any contamination such as metal chips or din. The crankshaft is sup- ported by two ball bearings. Important details, such as the connecting rod, are well pro- vided for in terms of bushings and lubri- cation holes. Besides having good film strength, synthetic lubes pass through the engine very cleanly, leaving little or no residue.

The piston is still bright and dean as observed from the exhaust side of the engine with the muffler removed. There's no varnish from being operated with totally synthetic lubricant. Just make certain you don't run lean or have poor cooling. When the engine stops and cools off, the varnish solidifies immediately.

If you operate your ABC 4- cycling, it will run exceptionally cool because the engine is only firing every other revolution, and the overly rich mixture is cooling the piston and cylinder. This cool condition aliows the piston and cylinder to rub excessively because the cylinder doesn't expand enough to fully overcome numerical control machines on line. The Magnum Pro 36 is a decidedly over-square design, having a stroke-to-bore ratio of.

The shaft thread is a USA the cold interference fit. The last thing you want to do is lose the tight piston fit. The replacement unit was for a 6,5c c front rotary-valve rear- exhaust engine for open pylon racing. When I tried to turn the engine over with the propeller, I couldn't do it! I thought I would break the rod or the crankptn. If you run in to a similar situation, simply heat the cylin- der before trying to start the engine, I've used a heat gun for film-type covering materials to loosen the piston-to-cylinder fit. Only about 15 to 30 seconds of heat application are required to do the job.

After the first few runs, the piston will naturally loosen to the point where external heat is no longer necessary. The engine should be operated at a rich, 2-cycling level — occasionally leaning for a few sec- onds— and then back to rich. By the way, be sure to use a break-in propeller whose diameter is 1 inch less than that of the rec- ommended flying prop. Wear your ear protectors, get out the lawn chair, and drive your neighbors nuts!

Marvel Mystery Oil, paying close attention to the indicator marks for the front and rear of the head and rod. In fact, there were so many things I consider incor- rect, I've written a detailed description concerning ABC-rvpe break-in procedures see sidebar. You don't mind a bit of con- troversy once in a while, do you? Magnum Pro instructions suggest: 1, Break-in propeller is the same size as the flight prop.

Use only castor-oil-based fuel. They later warn you against disassembling the engine: your two-year warranty will become void. Dark stains on the piston are caused by breaking down synthetic lubricants in the fuel. Strongly recommend using no more than 10 per- cent nitromethane for the break in. Allow it to run about 2 to 3 minutes in this condi- tion. The brew consists of 15 The Airtrax 40 weighed in at 5 3 A pounds for flight tests; 4 ounces of ballast had to be added to the nose.

The castor oil provides lOQOG - — a margin of safety against piston or cylinder damage , if I ever run lean in the air OO for some reason a speck of dirt in the spray bar? For the next 9 minutes, it was operated at 3-minute peri- ods, always at the rich 2-cycling mode.


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  6. The engine acted hot and required the cylinder-head screws to be tightened. The lesser bad allowed the engine to run cooler at higher rpm; it acted as if it wel- comed the change. After a half-hour, the engine was peaked- It held a steady 12,rpm for 30 seconds. The noise level at this rpm was a not-so-quiet 98dB at 9 feet, on the exhaust side of the engine.

    An additional 15 min- utes of 3-minute runs yielded a peak rpm of 1 3,, and very steady. The first dyno test series with the ,36 was conducted without a hitch using six load beams — until I noticed a loose glow plug on the last run. This necessitated a com- plete re-run, since I didn't know when the plug had loosened. The second set of num- bers were better than the first, which sug- gests that the plug was loose from the beginning. Strange how well the engine needled, and the nice steady rpm and torque readings. Live and learn. I'm looking forward to instrumenting the dyno for data retrieval.

    With the addi- tion of forced-air cylinder cooling and cylinder-head temperature instrumentation with exhaust-gas temperature measure- ment just down the road.. I currently have a checklist for the items that demand atten- tion for each load beam test: lock the torque arm; turn on the glow-plug heat; cooling fan; temperature meter; and 1 I've had trouble remembering to tum off the glow-plug heat once the engine has started.

    This compromises the run, which must be redone. The com- - — puter will help reduce the number of tasks I have to 1 Take a look at the correci- 1 The point is, l,2b. The engine is docile in its handling characteristics; it runs smoothly with no bad habits. Torque peaks at about lG,rpm and 90 02 -in. I can remember when some hot- shot ,60's couldn't generate 90 oz-in. Today's combination of induction, scavenging, combustion chambers, piston- cylinder materials and superb fits are pro- ducing engines of outstanding perfor- mance.

    Look at the rprn's obtained for potential flight props as tested. I had to add 4 ounces of lead to the nose to achieve balance. The first takeoff answered my concerns quickly: no problem! The little job really scooted around the sky, to the surprise of several people at the field — especially when they learned it was only a. At lower speeds, the aircraft must lose-up, through elevator trim, to tchieve the angle of attack that provides tdequate lift. The wing's angle of ncidence, relative to that center line, will hen be the same as the calculated angle of ittack.

    Figures 1 A and 1 B show the effect of too nuch incidence or too little. In both cases, iiselage and horizontal tail drag is higher. Either way, evaluation of the aircraft's top speed is required. He uses a variety of prop makes, diameters and pitches that arc suitable for the engine being evaluated. Figure 2 is a prop blade section. The nominal pitch is measured, with a pitch gauge, on the blade's rear surface, at a point that's 75 percent of the blade's length, mea- sured from the prop's center.

    The nomograph has been revised in Figure 7, and the range of pitches and rpm have been extended to reflect current condi- tions. The percent gain in revs from static to level flight has been retained: but a percent increase over the nominal pitch advance per rev replaces the 1 5 -percent loss used in the original nomograph. This graph w-ill enable you to arrive at a reasonably close estimate of your model' s top speed, based on the engine's static maxi- mum rpm and its prop's nominal pitch.

    These results will never be percent accurate, since the model's weight and drag w ill have an unavoidable impact, but they are close enough for all practical purposes. Align a straightedge from rpm, left, to prop nominal pitch, right. The speed in mph is read off the center scale. Congratulations, Dave Gierke, and keep up the excellent work. O, Box The two-day event, which was colorful and diverse, was cohost- ed by the Raleigh Aeromasters and Hobbies Etc.


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    The event directors, Robert Vess, Don Asplen and Gary Harris, were ably assisted by the club members in making this Nats one to remember. Thirty- four pilots from across the country and Canada came to compete in Unlimited Expert and Unlimited Formula Classes and for the Model Airplane News Technical Achievement Award, This was one of the best fun flies that I have ever attended, and one where pilots learned a lot about models that were designed to win. Every pilot in Unlimited used a computer radio. Left : Jeff Gilbert Jr does a little tweak- ing on his Wehra. Jeff placed second in the Unlimited Class.

    Azarr used carbon fiber to strengthen the wing spar, and he also used a carbon-fiber arrow shaft for the leading edge of the wing. A balloon was used for a tank, but without pressure. The Widowmaker weighed almost 2 pounds. To provide a very short nose moment, which helps the plane to make tighter, faster loops, the crankcase of the Enya engine was recessed into the wing. Azarr used a small The Widowmaker's engine is recessed into the wing. Azarr 's Widowmaker after an unfortunate crash.

    The times were converted to scores and computerized, using a program that was devel- oped by a club member, Jerry L, Smith set a record for doing five roops a roll followed by a loop in 8. Wynn Aker managed a modified Dixie Death a takeoff, three loops, three rolls and touch- down in Other Unlimited events included l 0 Outside and 10 Loop ailerons. These were set up to give indepen- dent spoiler action when the rudder stick was operated.

    He added short sec- tions of the ViexVa between these strips similar to shear webbing on a wing spar. This allows the servo and the control arm to be placed near the center of the airplane. Positioning the servos which have a comparatively large mass near the center line reduces the momentum that's required to rotate the airplane during rolls. This system also keeps the heavier parts closer to the CG.

    In many ways, this is a design that will be copied in the future. The best times for these were 13,52 and Formula planes are required to have servos that are enclosed in the fuselage, and wing-loading require- ments must be met. Engines of up to. These planes were blindingly fast, and they used up a lot of airspace. Jeff Gilbert Jr. Smith, KY Smith Sup.

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    Send appropriate sum together with your name and address to: Dept. Van Nuys CA He returned to win the W Jim Florio holding the model helps contestant Rich Hook get going for another round of roops. The model is a modified Coal Hauler. A home-built Kitfox and a helicopter stayed all weekend to give rides. If y OU ve never been to sor ducted tan was a competition fun fly, I urge you to go. Also, keep an eye on the Formula events. Box b. KS 6 Ml Virginia Beach.

    VA Florio Flyer Corp. Box HR. Dagus Mines. PA 1 1. W ebra; distributed by Horizon Hobby Distributors.

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    Futaba Corp. Irvine, CA IL Airtronics Inc. The fastest model at the meet: this BVM Aggressor ducted tan was clocked at mph! Formula Expert event. He also placed 11th in Unlimited. Great flying! Jerry L. Smith also won a trophy by placing third in Formula. He flew a fast, sensitive Spark airplane that was powered by a Webra All of the registered pilots voted for the Jeff Gilbert Sr. The Raleigh Aeromasters did a great job of spicing up the flying. On Saturday morn- ing, two full-size Wilgas flew in and landed on the foot-long paved club runway.

    Fox Mfg. Great Planes Model Mfg. Horizon Hobby Dist. SR Batteries Inc. Tower Hobbies Twinn-K U. Norman subsequently added a third prop channel by varying the audio frequency h la Space Control and Sampey. They wanted to share their discovery. Owing to the lack of desir- able commercial equipment, many mod- elers took the long road and built their own. They enjoyed it, too! Note the hand held control box. Systems such as Space Control, Sampey, Quadraplex, etc.

    Somehow, Norman acquired a rudimentary feedback servo the style that's used today , and he and Don saw its potential. Because it was an audio system, this channel feature was gleaned from the single-channel pulse types. The proportional controls were obtained by varying the rate at which the audio frequency was switched on and off.

    According to Don, hundreds of the systems were built, and many were successful. I've been waiting for an opportune time to discuss Don's fine work in detail. The flat-top Stormer was a popular design t and the Lee. As it had been previously, this Nats was dominated by cabin-style designs, but one biplane and one low-wing were present. The A taste of things to come: a neat low-wing with trike gear and all! Don recalls that during his first two attempts, the engine failed prematurely.

    Fortunately, the problem disappeared on the third flight, and Don's score was on a par with many of the Class 3 entries, and it easily won Class 2. At that time, genial Walt Schroder was the editor of Model Airplane News , and he was very impressed by Don's accomplishment. Walt offered to pub- lish the plans for Don's model, but Don and Norm convinced him that the sys- tem was far more significant. The wide- ly acclaimed series was the result. During the second time around, he revised the discriminator circuit.

    This was simpler, it reduced weight and was more com- pact. Later, a superhet front end was incorporated, and the single relay was eliminated. By this time, however, digi- tal had arrived, and analog propo was relegated to history. It allowed those of us who didn't believe in Tecds' to fly true feedback propo when commercial systems weren't available. Yes, we brazenly adapted ideas from others, but, in turn, we developed significant improvements and circuitry of our own.

    He does, however, keep a few early systems flying just to show newcomers how it used to be. His favorite is a Midwest Whizz Kid that's guided by an Ace Commander single- channel pulse transmitter with a Testors receiver of all things and an Adams actuator. He tells us that the OT'er is as reliable as our modem stuff and that its magnetic actuators are the finest he has seen for single-channel pulse, of course. Don tells us that Norman moved to Lockheed, CA, where he gave up mod- eling to become a full-scale flight instructor.

    This is a fine talc of two modelers who saw a problem and diligently worked to perfect the solution. Stiletto took third-place Silver with an Aerrow opposed twin and fixed gear. Just kidding about the gear. Duke has a perennial problem with retracts. We fove ya , Duke; never change! Both of their airplanes ended up in the Gold with onty one pitot to fly them. Every time race 29 and race were scheduled to race in the same heat no.

    Saxton kit; b. Don Rice skillfully touches down during qualifying. Expected to be a major threat this year, the 45tb. There's no longer any doubt that giant-scale racing lias make these races possible see sponsor box at end. This engine was broken in with 10 hours of bench running.

    A couple of very happy guyst Klaus Novak of Aerrow Inc. Pilot stations can be seen below. Evenly matched A T-8 Texans tend to occupy the same space at the same time. Early in the heat races, one lived and one died. Left: Dan Gray continued a winning streak that began with a first-place Gotd trophy at Reno Dan uses a singfe-stick Futaba transmilter and took fifth-place Gold and first-place Silver at Madera Giant-scale racing is becoming a truly professional sport, as experience , dependable engines and strong airframes begin to tell.

    Pylon turn lights were brighter this year see hefow. Balsa and ply are still competitive building materia fs: 51 ib. Seafury won second-place Gold and Best of Show! A 3-minute window seems more tike 3 seconds out on the Right tine. Diego Lopez flew b. KT Aviation Strega to a fourth-place Bronze finish. Bill Van Leeuwen's 4-cylinder. Venerable race 84 goes out in a blaze of. Bryan Keil flew the b. Scratch-built from Ziroli plans, the 84in.

    Race 84 won second - place Silver at Madera 93 and sec- ond-place Gotd at Reno Excellent piloting and an Aerrow engine overcame the excess weight of second-place Stiver winner, race David Smith made his debut on the race circuit on the sticks of this Sky Aviation Stiletto. Although the full-scale Lancair was too slow to com- pete seriously at Reno, the model, with its high-aspect-ratio wings and teardrop fuse- lage, was the aircraft to beat at Madera.

    The Lancair radar-gun readings registered over mph! Aviation Wt. The lion's share of Die spinners tor AT-6 Teaans and Unlimiteds were manufactured by Tm-Tum, while the overwhelming majority ot retracts were by Robart.

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    With a field of 76 aircraft and improvements in engines, kit designs and flying experience, the increase was to be expected. As racing technology improves, aircraft specifications may need to be loosened to maintain variety in the competition. The AT-6 specs are the same, so the only major factor that can account for the increase is the substitu- tion of the A PC 22x10 prop for the Zinger 22x 1 0 prop. One thing is certain: the overall speeds for the Unlimited racers will continue to Janine Walker of Robarl walks Tom Walker s race no.

    Tom is second from right in the pilot stations. Robart landing gear were widely used at the races, and Robart offered support in the pits. At far left is Cal Orr, flight-line director. This Two of the three exceptions were 7. In general, as the sport HBaifi!! The abili- ty of multi-cylinder engines to smooth out any engine vibration that might result from engine run-out is a strong argument in their favor, and it is unlikely that a single-cylinder engine will win at Madera in the future.

    Five of the trophies — including first- and second-place gold — were taken by Aerrow equipped aircraft. Of the 15 engines rep- resented in the trophy races, all but three were multi-cylinder. John made a fairly painless transi- tion from the aerobatic circuit where he has won numerous trophies in IMAC competition. KT Aviation offers in. Teardrop fuse- lage, high-aspect-ratio wings and a virtually enclosed Aerrow are the ingredients of a fast airplane.

    Aircraft was destroyed after tuned-pipe-related radio fail- ure caused it to plummet nose first into the ground past pylon 2. The wing , built by Paul Ross, was still capable of supporting the weight of two people after the crash. Wayne Voyles flew the James George 7.

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    Bubba and Wayne also put on a spectacular aerobatic show with two Lanier Stingers belching smoke. Of the 15 trophy contenders, only three weighed in at under 30 pounds dry , and they took first-place Silver Dan Gray , second-place Bronze Bill Hempel, Jr. The conventional wisdom seems to be that a sturdy air- frame is required for longevity, and that rigidity and strength with a powerful motor are the keys to success.

    They will work with the customer to develop the ideal prop for a given application. This 4-cylinder behemoth was built by Jim Van Leeuwen from two O. It has original cylinders and pis- tons, but the heads have been highly reworked. The motor features titanium valves and an extra-light valve train. Jim also built the 4-cylinder flown by Cliff Adams in the first Madera race, but this one has 20 percent more power.

    On the bench, it turns a 20x20 at about 7,rpm.