ABS Fly-In Savannah, Georgia, May 16-19 See Page 3 - American ...

Q:LED Landing LightEd LivermoreKerrville, TexasI need a new landing light, and I want to switch toa LED unit. At the ABS Convention there was oneon display that has a Full On and a Pulse On setting. Iam unable to recall the name of the company. Might youknow who it was?A:Most LED lighting options on the market today thatare approved for certificated airplanes do not havea flasher provision. The TCM Alpha Beam and WhelenPrometheus are both “drop-in” PAR 36 LED landing andtaxi lights that replace the standard incandescent bulbwith no flashing option.To get a flashing option, you may have been lookingat an HID or high intensity discharge light system like onesoffered by Knots 2 U, LoPresti, or Precise Flight. Thesesystems are typically paired with flashers.Alternatively, it may be possible to add a Precise FlightPulselite module to your existing aircraft wiring underSTC. You would need to contact Precise Flight to discussthis option and its applicability on the Bonanza. You canreach them at 800-547-2558. —CBwww.bonanza.orgQ:A:Family Owned and Operated Since 1974Aircraft exhaust systems have always been difficult to find and a problem to maintain.Knisley Welding, Inc. was formed to fill that need.We started our business in repair and movedinto manufacturing. Our extensive inventoryand quality service provides exhaust componentsto owners, operators, and repair stationsthroughout the world.Our complete parts department has hundredsof FAA/PMA approved parts on the shelf and ready to ship.View our online catalog and call to place your order. http://knisleywelding.com/Percentage of PowerTom Sheehan, St. Augustine, FloridaIs there an easy way to determine 65% power, or amore user-friendly table than that in my G36 POH?Beechcraft has not provided percentage of powertables for the IO-550 Bonanzas or Barons. I askeda long time ago and Beech’s reasoning is that few pilotsactually adjust manifold pressure and RPM to obtain aprecise percentage of power, but instead set full throttleand some selected propeller speed and take whateverpower that supplies. Further, percentage of power isdependent upon mixture leaning technique. When Beechbegan publishing Lean of Peak (LOP) power tables withthe 1984 A36 and Baron 58, it may not have wanted to showthe percentage of power at LOP setting is 8-10 less than thepercentage of power for the same combination of manifoldpressure and rpm when operating rich of peak EGT (ROP).In general, using the ROP charts in your POH, the 2500rpm settings are approximately 75% power at those altitudeswhere you are able to attain 25" MP (areas not shadedon the Cruise Performance chart). The 2300 rpm chart isapproximately 65% power at altitude where you can obtain23" MP; the 25" MP/2100 RPM setting is about 55% at altitudeswhere you can get 25", and the100 0 /0SATISFACTIONGUARANTEEDKnisley Welding Inc., 3450 Swetzer Road, Loomis, CA 95650Email: knisleywelding@sbcglobal.net • 800-522-6990, 916-652-5891 • Fax: 916-652-6257Hours: Monday - Friday, 8 am to 4:30 pm2100/21" chart is approximately 45%power at altitude where you can obtain21" MP.According to Advanced PilotSemi nars (www.advancedpilot.com),there is a direct relationship betweenfuel flow and power setting whenoperating LOP. Multiply fuel flowin gallons per hour by 14.9 to determinethe horsepower being devel oped;divide that number by the maximumrated horsepower (300 in your case)to derive the percentage of power. Thedirect relationship between fuel flowand percentage of power does not existon the rich side of peak EGT.Whether LOP or ROP, please notethe McCauley propeller AD thatprohibits continuous operation at2350-2450 rpm when above 24" MPin McCauley 406- and 409-seriespropellers, and Continental’s advisoryagainst operating most of its productsfor extended periods below 2300 rpm.The AD and the recommendation bothappeared long after the Beech tableswere created. —TT72 AMERICAN BONANZA SOCIETY FEBRUARY 2013