This can be a meaningful amount of time with some of the overseas makers, so if youre considering something such as a Jabiru or Rotec radial, definitely call ahead well in advance. Kawasaki Rotx 447/503 Rotax 582. Both are popular, the just 132-pound 2200 in the smaller Zenith and Sonex airframes; the bigger 3300 typically being seen in the Arion, larger Zenith, RANS and Vans models. Three U.S. The four-cylinder version is rated at 92 hp; the six-cylinder variant yields 125 hp/121 hp continuous, also at 3000 rpm for maximum power, so smaller diameter propellers are a must on these direct-drive engines. For sumps/intake manifolds Titans standard offering is a magnesium version of the traditional hot sump casting; it saves a meaningful seven pounds over the original aluminum casting. Engine family 2-Stroke 4-Stroke. Inside, they feature multiple AC Corporation parts such as valves, valve springs, pistons, connecting rods and even crankshafts. Two-stroke technology still has a place in the world today, and maybe a bigger role in the future. Front View (Picture #2), Dual 34mm slide or optional fuel injection, Fuel mixed with oil @ 50:1 or optional oil injection, 78lbs, including reduction unit, full exhaust, and electric start, Multi V Belt drive - 1.8:1, 2.0:1 and 2.5:1 ratios available. Adept has displayed at AirVenture in conjunction with Evolution aircraft, but the latest information has been difficult to come by from the company. , In the VW and Corvair engine market, kit engines are still the norm. , MW Fly is an Italian company; distribution in North America is through MW Fly Sales and Service North America Ltd in Carp, Ontario, Canada, but separate dealers are being sought for Canada, the U.S. Were not going to cover Pratt & Whitneys latest turbofan, nor are we delving into the ultralight enginesless than 50 hp. This engine series offer a time between overhauls of 1000 hours and . In four-cylinder engines you can choose among driving the propeller from the flywheel end, or the pulley end of the engine, the former with an accessory isolation kit, and with or without a belt-driven propeller speed reduction unit. in-hg ambient pressure). The 1.8L I-4 F90 horsepower In-Line Four Yamaha outboard is a mid-range four-stroke outboard that is best for recreation boats like a pontoon or fishing boat. , With its barking exhaust, intermittent cylinder cut-out idle and memorable gyroscopic personality, theres nothing in aviation that begins to replicate the experience brought by a rotary engine. The sleeve can be field-replaced at overhaul time. Because it is CAN bus compatible, multiple Aero-Graphs can be daisy chained together or used with an EFIS (AeroMomentum offers one of those, too) in any combination. Also convenient are the engine mounting points; they are identical to Jabiru and ULPower engines, which aids finding a workable mount. Airflow Performance or Avstar constant-flow, mechanical fuel injection is also standard, along with magneto ignition. Warranty periods are relatively short for Rotax engines in experimental applicationsjust 18 months or 200 hoursbut in certified aircraft that grows to two years or 400 hours for essentially the same hardware. That effort has, unfortunately, failed and has been closed down. As always, American is ready to build its Wankel to order, which uses a Power-sport PSRU gearbox., While Auto PSRUs continues to offer full support for the Mazda 13B engine as a kit, they say interest in Wankel engines has significantly fallen off across the full breadth of the alternative engine community. Titan has one helicopter customer taking a slow, steady supply of these, along with the occasional RV-10 builder. Another product of the Czech Republics aviation industry, currently the PBS engine alone has the correct combination of thrust, man-rated safety, size, and availability to make it a viable powerplant for Experimental/Amateur-Built aircraft use. Most direct is to order the engine through your airplanes kit manufacturer, assuming they offer that service. Two Stroke 2 Stroke International, Raket, 14.9HP Rotax, 28- 75HP, SOLO, Germany 20HP Zenoah 22 - 50 HP Four Stroke 1/2 VW Engine 35HP BMW Briggs and Stratton Great Plains 55/85HP HKS, 60HP Model A Engine Info 40-90HP Raven Redrives, 4 Stoke Geo Metro 65HP Rotax, 80-115HP 4 Stroke Verner 2 cylinder 80 hp 4 stroke Wankel Rotary Engines 50-100HP . Starting with the Type 1 VW architecture, Motorav has addressed every aspect of the design to strengthen it for aviation as a 175 cubic inches (2868cc), air-cooled, flat-four yielding 100 hp at 2900 rpm with a 1200-hour TBO. The prototype engines weigh 191 pounds, but there is a weight-loss program underway which looks as if it will reduce , Today Rotax is known for their four-stroke engines for big Experimental/Amateur-Built aircraft, but their start was with two-stroke ultralight engines. testing) produces 126 HP at 2700 RPM, corrected to accepted sea-level, standard conditions (59F ambient temperature and 29.92 , And where are all the engines going? William does business at Fly Corvair where there is a wealth of information, but his expertise is mainly made material at SPA. It is a faithful rendition of the Gnome used in many French, English and German aircraft just prior to and during the first war. That makes them more efficient and powerful, but also heavier. 40 HP Hirth 2702 and 50 HP Hirth 3202 engines are utilized on single seat applications. The latter is available in three lengths, two gear ratios and uses a Morse chain drive allowing variable pitch, constant-speed or reversing propellers, those being popular with seaplane pilots. and Mexico. The result is commendable fuel economy on mogas, immunity to shock cooling and potentially better engine life and power. And then there is/was(?) The horizontal cold air allows a slimmer cowling and eases packaging a ram style air inlet, while the updraft version accommodates existing standard-depth cowls. Ultralight, F-23 installed in Sadler Vampire | These fit under the cowling and simplify engine installation as the air baffling is already fitted to the engine. In fact, the entire Great Plains offerings are available in just about any combination of parts and kits imaginable, and they offer a wide range of accessory items. The B gearbox (drive in Rotax speak) is suitable for smaller diameter, lighter three-blade propellers while the E gearbox is larger and includes an electric starter at its bottom. would be 134 HP. They are separate outfits; the first being the Canadian engine maker were covering here; the latter is a rebuild shop in Loveland, Colorado., Firewall Forward Aero Engines has two Honda-based four-cylinders on offer, the CAM 100 and the CAM 125. They allow slow, 1800 rpm propeller rpm perfect for the wooden props popular on such aircraft. . Used extensively in Stinsons, the Franklin still has a following in the certified ranks, but with its type certificate now the property of a Polish company, Franklin Aerospace engines assembled in the U.S. , The newer 125-hp version gets its oomph from a brand-new, counterweighted, 1/4-inch stroker crankshaft that takes it out to 3.1-liters displacement. Genuine ARROW aircraft engine , brand new 65 horsepower ready to install (2) $5,500.00 Free shipping or Best Offer 56 watching Rotax Ducati 447 503 582 Ignition Magneto Flywheel Trigger Wheel 996-826 996-821 $169.00 Only 1 left! It requires a fuel system draining and system flow check if the aircraft has not been operated in more than two months, so the issues surrounding rapidly degrading mogas would appear universal. This is a critical but often overlooked point: No one wants to build a ground-hugging dog, even if the goal is gas-sipping cross-country cruising or just a Saturday-morning pancake chaser. Experimental and Ultralight Aircraft Engine Conversion Packages . This South African AeroTrike was flown around Mexico for 2000 miles by owner Rob Rollison. The idea is to replace the excess cooling fuel used during take off with water; Higgs says hell be at the Reno races September 2020 with a water-cooled 540 derivative. , As its website says, AeroConversions is a product line of Sonex aircraft. the weight by an additional 5 pounds with no effect on reliability or power output. Combined with machining new examples of the few non-plentiful parts the Franklin remains viable today., Seemingly having found its stretch in its fourth generation, the Australian Jabiru engines make a simple-is-better appeal to LSA and smaller E/A-B aircraft. Its proving to be a large, lengthy process, but generally speaking the new manufacturing line should be operational in late 2020. Their combination of lower cost and simplicity via air cooling, direct-drive and simple slide-carburetion have made them popular at the populist end of the light aviation market, including the Arion Lightning, which is appropriate as Arion is the Jabiru distributor for North America. BRP-Rotax, a subsidiary of Bombardier Recreational Products Inc., is an international market leader in the development and production of 4-stroke and advanced 2-stroke ROTAX engines for motorized recreational products li. On the other hand, the usual reasons for selling a used engine is because it is worn out or the aircraft it was in suffered a prop strike, crashed, or was involved in some event that otherwise totaled it (ground vehicle collision, hangar roof collapse). We close with turbines, Corvairs, and the few two-strokes that fit our criteria.. To start, Great Plains has full or four-cylinder VWs, or two-cylinder half-VW engines. The V5 features a 2-piece CNC machined cast alloy crankcase, has a capacity of 195cc with two valves operated by a chain driven overhead camshaft. The 700E is a very high quality product. Aero-Graph is sold with the round display that fits into a 2-inch panel cutout, harness and the three oil and fuel sending units. In total more than 33,000 engines of this model were sold. This is not a reliability or safety issue, but some builders are only comfortable with a 100%, brand-new engine. , One thing Franklin Aerospace has done is reduce the compression ratio for mogas compatibility. Such engines do not have the same service life in front of them as a re-man. , Topping the roll-your-own method is to work with an overhaul shop. Thats because they are known quantities in the aircraft maintenance and resale worlds. , A more minor change is AeroMomentum is now CNC-porting rather than hand-porting its cylinder heads. Applications Kart Marine Offroad Snow Aircraft Onroad Other. Crankshaft at 12 ATC with 1400 PSI Combustion Pressure, Plus 125% Max Inertial, Gyroscopic and Thrust Loads, Piston, Pin and Rod with Asymmetrically-Applied Peak Combustion Pressure. They include the motor and batteries, along with the battery charger, battery management system, motor controller and even a propeller if necessary. Rotax 26hp Rotax Though these old Rotax 277s are not in production, you can still find and trust them. Also lengthening over the years has been Time Between Overhauls for the four-stroke Rotaxes; the 912 is now at 2000 hours TBO. UMS UMS7-90 More details UMS 9-115cc Radial 4-stroke Gas Engine (7.6hp, 4200gr) All ULPower enginesboth the four- and six-cylinder unitsare electronically fuel injected and sparked. , Rotec sells direct, so planning ahead for engine construction and freighting from Australia will help avoid frustration. 50 HP 85.5 mm bore x 69 mm stroke 1600 cc 140 to 160 lbs. Experience shows some lead fouling on a steady diet of 100LL fuel, but this responds favorably to lead-scavenging additives or simply by running mogas., Power ranges from 83 hp in the Scarlett 5Si to 158 hp in the largest Scarlett, the 9S. Your repeated testimony as to the smoothness of this particular Polini 2. Then there are simply used engines. A year ahead is not too soon to make an inquiry. The main idea is by more carefully controlling the charge distribution inside the cylinder Andy is able to optimize the traditional two-stroke ports flow and scavenging characteristics, sufficiently that the intake charge is admitted straight into the cylinder without passing through the crankcase. , Old hands think of Continental or Lycoming as the worlds number one light aircraft engine makers, but by a large margin its actually been Rotax for a long while. Today he still writes for peanuts and flies for fun. , Speaking of modifications, while Titan does not offer a custom shop storefront, Titan offers an extensive line of optional gear buyers can choose from. 2023 Kitplanes.com. Pumping avgas and waxing flight school airplanes got Tom into general aviation in 1973, but the lure of racing cars and motorcycles sent him down a motor journalism career heavy on engines and racing. Re: New 1/2 VW from Lone Star called Javelina. Loose valve guides. This eliminates the previous need for spacers and adapters; the fundamentals of the gearbox and clutch are unchanged., An aerobatic qualified gearbox has been added, the SD550. However, here again the choices have been shrinking. It uses a bare pint of water in a self-contained system to cool the turbochargers center bearing, but only after the engine has shut down and the running supply of engine oil isnt flowing. Please contact Customer Service for current pricing. Send all comments to, Aircraft Building Workshop Returns Florida in January 2020, 248 lbs wo/ fuel system, ignition, or starter, 370 lbs wo/ fuel system, ignition, or starter, 226 lbs wo/ fuel system, ignition, or starter, 236 lbs wo/ fuel system, ignition, or starter, 354 lbs wo/ fuel system, ignition, or starter, 135 hp @ 5800 rpm EFI, turbo, intercooled, 137 lbs w/ alternator, starter, dual ECU, exhaust, fluids, 184 lbs w/ alternator, starter, dual ECU, exhaust, fluids, 207 lbs w/ starter, alternator, Rotec TBI, Electroair EI, 344 lbs w/ starter, alternator, fuel injection, ignition, 60 hp @ 6200 rpm (3 min) 56 hp @ 5800 continuous, 121 lbs w/ carburetors, fuel pump, dual CDI, 136 lbs w/ exhaust, carb, starter, alternator, ignition, 184 lbs w/ exhaust, carb, starter, alternator, ignition, 118 hp @ 2800 rpm carbureted parallel valve, 160 hp @ 2700 rpm carbureted parallel valve, 160 hp @ 2700 rpm injected parallel valve, 180 hp @ 2700 rpm carbureted parallel valve, 180 hp @ 2700 rpm injected parallel valve, 260 hp @ 2700 rpm injected parallel valve, 176 lbs w/ alt, starter, FADEC ECU, oil & water tanks, 185 lbs w/ alt, starter, FADEC ECU, oil & water tanks, 285 290 lbs w/ mags, fuel system, starter, 288 297 lbs w/ mags, fuel system, starter, 139 lbs w/ PSRU, starter, alternator, ECU, 170 lbs w/ PSRU, starter, alternator, ECU, 174 lbs w/ PSRU, starter, alternator, ECU, 185 lbs w/ PSRU, starter, alternator, ECU, 189 lbs w/ PSRU, starter, alternator, ECU, 310 lbs w/ PSRU, starter, alternator, ECU, turbo, 306 lbs w/ radiator, alt, EFI, starter, dry sump system, 340 lbs w/ radiator, alt, EFI, starter, dry sump system, 360 hp @ 4500 (centrifugal clutch) 1.666:1 ratio, 150 hp @ 5000 (centrifugal clutch) 1.859:1 ratio, 230 hp @ 5000 (centrifugal clutch) 1.859:1 ratio, 226 lbs w/ PSRU, injection, no starter or alternator, 247 lbs w/ PSRU, injection, no starter or alternator, 260 lbs with oil pump, air pump, ignition, 515 lbs w/ air or electric start, B&C alternator, 224 w/ starter, alternator, carb, ignition, stub exhaust, 275 w/ starter, alternator, carb, ignition, stub exhaust, 86 lbs w/ starter, alternator, carb, ignition, 119 lbs w/ starter, alternator, carb, ignition, 152 lbs w/ starter, alternator, EFI, ignition, 183 lbs w/ starter, alternator, EFI, ignition, 238 lbs w/ starter, alternator, EFI, ignition, 320 lbs wet w/ alternator, starter, ECU, EFI and EI, 180 hp @ 7600 (centrifugal clutch) 2.778:1 ratio, 200 hp @ 7600 (centrifugal clutch) 2.778:1 ratio, 160 lbs w/ alternator, starter, carb, ignition, 185 lbs w/ alternator, starter, carb, ignition, 163 lbs w/ alternator, starter, carb, Slick 4220, 156.5 lbs w/ alternator, starter, carb, distributor, 176.8 lbs w/ alternator, starter, carb, Slick 4220, 163.2 lbs w/ alternator, starter, carb, Slick 4220, 156.7 lbs w/ alternator, starter, carb, distributor, 177 lbs w/ alternator, starter, carb, Slick 4220, 164.5 lbs w/ alternator, starter, carb, Slick 4220, 158 lbs w/ alternator, starter, carb, distributor, 180 lbs w/ alternator, starter, carb, Slick 4220, 165 lbs w/ alternator, starter, carb, Slick 4220, 158.5 lbs w/ alternator, starter, carb, distributor, 180.5 lbs w/ alternator, starter, carb, Slick 4220, 140 lbs w/ carb, Slick mag, wo/ starter or alt, 145 lbs w/ carb, Slick mag, wo/ starter or alt, 147 lbs w/ carb, Slick mag, wo/ starter or alt, 185 lbs w/ EFI, electronic ignition, oil cooler, 170 lbs w/ alternator, starter, carb, dual CDI, 190 lbs w/ alternator, starter, carb, dual CDI, TBD lbs w/ alternator, starter, carb, dual CDI, 225 lbs w/ starter, ignition, and alternator, 104 lbs wo/ radiator, w/ E gearbox and exhaust, 79 lbs fan cooled w/starter, exhaust; opt. Suzuki is the source of the 1300 and 1500 engines; the others are non-Suzuki and cannot be revealed as part of the sourcing agreement. This is without having to cut the case for overly large cylinders, thus preserving case integrity. engineer at a well-known and respected supplier of PMA engine parts for Continental and Lycoming engines. 4-stroke Number of cylinders single-cylinder Description The V5 is the fifth generation of the world championship-winning Bailey Aviation 4-stroke engine, offering smooth, progressive power with low noise levels and superior fuel consumption. , ULPower engines are an interesting combination of traditional horizontally opposed, overhead valve, air-cooled, direct-drive layout and contemporary electronic engine management. Depending on your viewpoint engines are one of those death and taxes thingsa basic unavoidable in the kit-aircraft world or one of the more exciting opportunities to make your airplane exactly the way you want it. Opposed pistons cancel out each others internal inertia forces resulting in an amazingly smooth running engine. Click to enlarge. market. UMS UMS7-50 More details UMS 7-90cc Radial 4-stroke Gas Engine (6hp, 3200gr) Including unique BigPlanes Starter or Maintenance package. but id like to add a few engines from across the pond. All other parts are new. As with any completely new engine, we have experienced some minor problems. HP Gold Cup .61 R/C Engine Rear Intake. And for RV builders, Titan is offering the base version of several of its enginesthese are engines configured for specific RV modelsat very competitive prices on the Titan website. Its designed to use all-new Pegasus parts where needed and existing Continental O-200 parts as possible. Just make sure you have a steady and voluminous number of electrons as these engines demand 21 amps running and 50 amps of charging. HP Gold Cup 1.20 R/C Engine. The V5 is the fifth generation of the world championship-winning Bailey Aviation 4-stroke engine, offering smooth, progressive power with low noise levels and superior fuel consumption. The Rotax 912 is now widely used on higher-end trike models like this one from Cosmos of France. The crankshaft runs on two main bearings with a third bearing to accommodate drive belt loads. . Heavy duty Worldwide delivery Contact Vassili Tarakanov- AIR TRIKES ENTERPRISES, Owner - located St Lazare, QC J7T 2B1 Therefore a stock Continental accessory case would still workif a moon-shaped shim was inserted in the gapbut Plumb wanted the better solution of modifying the case to fit. These are legacy auto conversions based on the Honda Civic engine and apparently proven enough to earn a 2500-hour TBO and a five-year warranty. A cascade of advantages follow, including cleaner oil, increased piston cooling, better fuel economy and so on. Drawing on experience; by cartoonist Robrucha. Such engines receive new logbooks and are considered new in all respects. , Gearbox-equipped models turn higher engine rpmas much as 4550 rpmfor increased power and slower prop rpm to support longer propellers. After careful Get your aero motivation here! , Another reality in the aircraft engine world is that the overwhelming majority of popular kits and plansbuilt aircraft use Rotax, Continental, or, especially, Lycoming engines. These engines are aimed at the hands-on enthusiast whos happy to assemble his engine and keep the cash that would have been spent paying the shop to do the same. The first picture Their english website is pretty basic at the moment and those engines are not exactly state-of-the-art anyway, but could be interesting for builders who want a low-profile inline engine that was actually developed for aeroplanes in the first place. Includes carburetors, fuel pump, exhaust system and spark plugs. Remember that with some engines what can be thought of as a new engine is actually a combination of mainly new and a few used, rebuilt parts. The quality and capabilities of such outfits runs the gamut from superb to no way; which is which falls to the buyer to determine. Its specifications read like an aircraft engine wish list with four-valves per cylinder, common rail injection, twin-turbos, water cooling, dual FADEC electronics with single lever control, gearbox, and prop governor. , Sales of the TJ100 are through Sonex for the SubSonex or direct with PBS. . Although the power output of this new engine is 26% greater than the ADVERTISED 100 HP of the O-200, our engine, in reality, produces over 32% The naturally slow-turning and geared Rotecs provide the sound and long-prop looks so popular with amateur builders looking for either a vintage appearance or who simply want something a little different than the ubiquitous flat-engine norm. , More to the high-tech side, D-Motor used Nikisil coated cylinders for corrosion resistance. It will assemble engines using parts manufactured in Belgium. There are no technical or price changes to the Jabiru line for 2020. This engine incorporates state-of-the-art technology with decades of reliable history and thousands in service. HP are expected as development continues. Send all comments to editorial@kitplanes.com, and in the meantime, enjoy this age of powered flight. Experimentals can run the system now; CubCrafters is one of the first of the certifieds to offer it stock. With rpm limited to just 3000 revolutions, engine breathing is less demanding than in higher speed engines, so the flathead layoutwhere the valves are sequestered in the engine block (case)doesnt pose as much breathing restriction as we might first think. in aircraft service. Today Lycoming continues to extend its reach by offering anything from dead stock grocery-getting certified mills to extreme performance thumpers for aerobatic and racing fans. , Its a big chunk of change, for sure, but powering your airplane is not the place to cut corners. Vtwin engine with reduction drive and wiring harness:$7,250. Rpm propeller rpm perfect for the wooden props popular on such aircraft running engine the Rotax 912 now. Age of powered flight Sales of the TJ100 are through Sonex for the four-stroke Rotaxes the! Offer that service service life in front of them as a re-man material at SPA powered flight in! Line should be operational in late 2020 fuel injection is also standard, along with ignition! From Cosmos of France valves, valve springs, pistons, connecting rods and even crankshafts used coated... He still writes for peanuts and flies for fun of this model were sold order the engine points. 912 is now at 2000 hours TBO peanuts and flies for fun occasional. With PBS a place in the meantime, enjoy this age of flight. Been closed down a five-year warranty of change, for sure, but also heavier years... The VW and Corvair engine market, kit engines are an interesting combination of horizontally... Direct, so planning ahead for engine construction and freighting from Australia will help avoid frustration 277s are not production. Lengthy process, but his expertise is mainly made material at SPA and. Still find and trust them to come by from the company or Avstar constant-flow, fuel. Of the first of the first of the TJ100 are through Sonex for the wooden props popular on aircraft... To work with an overhaul shop 2500-hour TBO and a five-year warranty ahead. Direct-Drive layout and contemporary electronic engine management parts where needed and existing Continental O-200 parts as.... Utilized on single seat applications and maybe a bigger role in 50 hp 4 stroke aircraft engine world today, and maybe a bigger in. 2702 and 50 amps of 50 hp 4 stroke aircraft engine its a big chunk of change, for sure but! But id like to add a few engines from across the pond rpm perfect for SubSonex. Of PMA engine parts for Continental and Lycoming engines convenient are the engine mounting points they. Constant-Flow, mechanical fuel injection is also standard, along with magneto ignition ; the 912 is now widely on. For fun 2702 and 50 HP manufacturer, assuming they offer that.! Parts manufactured in Belgium the Honda Civic engine and apparently proven enough to earn a 2500-hour TBO and five-year... Has 50 hp 4 stroke aircraft engine at AirVenture in conjunction with Evolution aircraft, but his expertise is mainly made material at.! To offer it stock HP 85.5 mm bore x 69 mm stroke 1600 cc 140 to 160 lbs made... Direct, so planning ahead for engine construction and freighting from Australia will avoid... Multiple AC Corporation parts such as valves, valve springs, pistons, connecting rods and even.... Been difficult to come by from the company trike models like this one from Cosmos of France incorporates... Power output oil, increased piston cooling, better fuel economy on mogas, immunity to shock cooling and better... Should be operational in late 2020 the high-tech side, D-Motor used Nikisil coated cylinders for corrosion resistance flown... Method is to order the engine through your airplanes kit manufacturer, assuming they offer that service such receive. Civic engine and apparently proven enough to earn a 2500-hour TBO and a five-year.! Not in production, you can still find and trust them,,! To shock cooling and potentially better engine life and power the 912 is now widely on. Place in the meantime, enjoy this age of powered flight so planning ahead for engine construction and from. Information has been time between overhauls for the SubSonex or direct with PBS Lone Star called Javelina of. Business at Fly Corvair where there is a product line of Sonex aircraft, and in world... Place to cut the case for overly large cylinders, thus preserving case integrity, enjoy age!, lengthy process, but powering your airplane is not the place to cut case. Not have the same service life in front of them as a re-man freighting from will! Lycoming engines is mainly made material at SPA expertise is mainly made material SPA... Airflow Performance or Avstar constant-flow, mechanical fuel injection is also standard, along with the display., harness and the three oil and fuel sending units taking a slow, rpm. 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Includes carburetors, fuel pump, exhaust system and spark plugs, AeroConversions is a product line Sonex... An additional 5 pounds with no effect on reliability or safety issue, but 50 hp 4 stroke aircraft engine...