double tap to read brief content. Covers, Boat Shrink Wrap Motors, Fishing Downriggers & Step 3: Select the HP for your marine engine. Maintenance, Pumps and Oars, Wakeboard, Wakesurf & Established in 1998, Gutterworks Mfg, Inc. (Formally Front Street Manufacturing, Inc.) was founded on the ideas of becoming industry leaders for residential and commercial gutter supplies and downspout components with an . Peter Hall graduated from the University of Delaware with a Bachelor of Arts in history and journalism in 2005. If you plan to use it for fishing, youll need a different prop than if you plan to use it for skiing. Transom Plates: The serial number tag is located on the inner transon plate inside the boat; or, on the upper swivel pin. Deals, Camping & RV 3. Cable, Marine Batteries & 2023 Mercury Marine. Got questions? For example, a 21-pitch propeller would move forward 21 inches in one revolution. Storage Infopop Corporation (formerly Madrona Park, Inc.), 1998 - 2000. Is it safe to buy furniture with Prop 65 warning? Professionals, Shop The latest Arizona headlines, breaking news, in-depth investigations, politics, and local community stories that matter to you. Engine Serial Number: The serial number tag is located near the starter, by the flywheel housing; or, on the rocker arm or flame arrestor cover. There IS a number SOMEWHERE on the prop. Terms of Use Look on the hub, under the nut, but somewhere there IS a number. Sockets, Marine Electrical Pitch is the theoretical forward distance a propeller travels during a revolution, measured in inches. Mercruiser sterndrive engine serial numbers are formatted as follows0W555555. Transom Bilge Pump, Tires, Rims, & Hub There are a few different places you can look, and each has its own advantages and disadvantages. All, Boat Bimini The Ultimate 250 HP Setup: Outboard Hot Rods from Mercury and. The first character is the number 0, not the capital letter O. Your engine may struggle to move the boat at all. For an aluminum Quicksilver or Mercury Marine propeller, the prop size is stamped or cast into the outer part of the hub. Protection, Dock Storage & your boats Gel Coat Match, Shop One option is to go through a boat propeller manufacturer or dealer. More info boat is 1991 Outrage 19. I would suspect it is simply to allow more room for the cylinder and prevent any pinching when the motor is tilted. Then, consider the material of the propeller. Boarding, Paddles & Choosing the right propeller for your boat is essential for great performance. Amazon, the Amazon logo, AmazonSupply, and the AmazonSupply logo are trademarks of Amazon.com, Inc. or its affiliates. No, 49 isnt the most popular number. Hardware, Marine This prop seemed to work real well for this set-up. serial numbers than listed in these guides. Click on the "prop basics" section, and the "determining rpm" section, on the left side of the page.<br /><br /> http://www.boat-props.com/ <br /><br />If you are considering the Aluminum Hustler props, they are a slightly larger diameter (13.25"). You're almost there! So if your serial number is "01234567" you would use only the "1234567" part of it when looking at the chart below If there is no Canadian number listed they were not produced there in that year Drink Holders, http://www.iboats.com/mall/index.cgi?prod_id=1488, http://www.iboats.com/mall/index.cgi?prod_id=1486, http://www.iboats.com/mall/index.cgi?prod_id=1511. Ski, Wakeboard Screws, Boat Handles, Pulls, Platforms, Slide Match it to this list and click on it to see the exact replacement. Inboard Prop Sizing: Allow the experts at Propeller Depot to complete your free inboard propeller sizing. Oars, Wakeboard, Wakesurf & Insurance, Boat If the engine is running above redline, the pitch of the current prop is too low. Savers, Boat Trailer Guides & Grills, Boat Drink Monitor And Tegu For Sale, Mercury Outboards Durable. Rebel Without a Cause is a 1955 American coming-of-age drama film about emotionally confused suburban, middle-class teenagers.Filmed in the then recently introduced CinemaScope format and directed by Nicholas Ray, it offered both social commentary and an alternative to previous films depicting delinquents in urban slum environments. The propeller acts as a one--speed transmission for your boat, so it is important to match it to the engine, CompProp states. Locate Mercury boat dealers and find your boat at Boat . Outboards, Shop It appears you recently signed up to receive the latest tips, promotions and news from Mercury Marine. Plumbing, Anchor How do you tell if a propeller is left or right? The number on the mercury prop following the "P" is the pitch, in inches. The long string of numbers and letters is the manufacturer's part number. A "0" in front of the serial number is not significant, it's a placeholder only for Mercury's software. Meters, Marine Electrical Panels The lower the prop pitch, the better your hole-shot. It's a 15.25" x 15" 15P aluminum 3blade prop. Where Do Pelicans Sleep, The pitch of a propeller is how far the blade would move forward in the water during one complete rotation, BoatFix.com explains. Honda 5hp Outboard, Boat The closest matching Michigan Prop is a 13 3/4 inch diameter by 21 pitch (Mich # is 031026) If you can get your hands on a comparable SOLAS prop I would recommend it. 1st Inspect. Hello, I would like to replace my propeller on my 1988 Mercury 175. propeller length from tip to tip. Wells, Toilet & Waste Thought I would find the diameter and pitch on the hub, but only find this number; 48 77350 A40 23P Both props have the same number. By 150-200 RPM, each inch of pitch size will change the RPM. Towers, Tow Ropes & Detectors, Binoculars & Supplies, Boston Whaler, 1972-1993, 1. Holder, Anchor & Dock The correct propeller size lets you open the throttle fully, allowing the engine to generate as much horsepower as possible without going over its redline. Acessories, Fishing Outriggers & Knowing how to interpret the numbers on your existing propeller will help you buy a replacement propeller that provides the best performance from your boat and engine combination. Fenders, Boat Trailer Sockets, Marine Electrical Axles, Boat Trailer Tie The first number is the propeller diameter in inches and the second is the propeller pitch in inches. Switch to a propeller with higher pitched blades if the RPM is higher. Seats, Pontoon Boat Seats & The Right Fit, Shop By If so, jot it down and we may be able to cross reference your boat propeller and find the equivalent prop in a different brand or product line. Systems, Lowrance Hook2-4 GPS Products, Carbon Monoxide & Just to make sure you're able to get that information, Quicksilver/Mercury Marine also cast the size dimensions into the inner part of the hub, which is easier to read. More info boat is 1991 Outrage 19. It was there in the shop and free for a test ride. ACCOUNT, Find Accessories, Marine Electrical The number on the mercury prop following the P is the pitch, in inches. Galley, Covers and How Many Propellers Does a Cruise Ship Have: You Wont Believe? Locating MerCruiser Serial Number Tags. If you can get your hands on a comparable SOLAS prop I would recommend it. They have a large selection of propellers to choose from, and they usually have lower prices than manufacturers or dealers. Wells, Toilet & Waste Email: office@bblades.com Phone: 920-295-4435 Need to Ship Your Prop To BBLADES? 19" sounds like just what you need. We WILL need your serial number to look up correct parts. All rights reserved. Hardware, Boat Traditional to advanced digital platforms. They can help you make an informed decision about the boat propeller you are buying, and what type of engine it needs. Bilge Pumps, Shop Helm Seats, Shop Trailer Winches, Shop https://www.savvyboater.com/boat-propellers/ - Before you start shopping for your next boat propeller, you should know what kind you currently have. Boat Repair, Boat Paint & Maintenance, Boat Cleaners & Boats, Propeller Parts & Look at the pitch of the propeller. Shelters, Boat Rails, Marine Tools & Tool Accessories, Electronic Navigation . Next, figure out the diameter and pitch. The Right Fit, Shop By Manufacturer, Boat Tables & Sealant, & First, consider the displacement of your boat. 3. Caulking, Marine Engine Page 1 of 1 Start Over Page 1 of 1. The first number on a boat prop identifies the diameter of the propeller in inches. A two-digit number is displayed in a box at the lower right side of the serial number label on the most recent serial number labels. The propeller diameter is self-explanatory in my example6 inches, 8 inches, and 10 inches, respectively. Marble, Engine Shop Acessories, Fish Cleaning Furniture, Boat Seat Pedestals & Anchor Box Anchors, Fishing Rod & Reel Parts, Boat Tubing & Waxes, Boat Cleaning Videos . GPS Chartplotter and Fish Finder Combo, Find Accessories, Big Jon Write down the number on your prop. Sign-up for Mercury Email. It is important to make sure that your prop has the correct amount of pitch for your boat, to ensure optimal performance. However, this comes at a price: top speed. Acessories, Fishing Outriggers & I have a '78 15ft striper powered with '91 4cylinder 2carb 2-stroke mercury 40hp engine. before making any changes to the propeller pitch, it is important to consult with a marine mechanic to determine if a higher pitched prop will be beneficial for your specific boat. The diameter and pitch of the propeller are always stated first, with diameter always being stated first. Accessories, Pontoon Bimini Ropes, Boat Tops, Other Software, Digital Larger diameter props create more thrust than smaller diameter props for a given rpm. PFDs, Roof Racks, Carriers, Professionals, Boat Topics and Questions (not engine topics). A lower pitch will increase the acceleration of a boat, while a higher pitch will increase the top speed, Overton's explains. 2. Biminis, RV & Trailer Accessories, Boat Lift Canopy All rights reserved. The boat will perform like a new boat, assuming the engine is still strong. (How much can I trust a tach that reads 1000 RPMs when engine is off?) If the prop with 14 inches diameter fits your Mercury motor then definitely go for it. Switch to a propeller with lower pitched blades if the RPM is below the recommended operating range. & Sonar, Trolling A couple ways to estimate this: 1) use the Mercury Prop Slip Calculator, or 2) if you know the top speed of your boat, enter the RPMs, Pitch and Gear Ratio in the Boat Speed Calculator tool and vary the slip value until the estimated speed is correct. More information and data on more boat and engine functions than any other system in the boating industry. Deals, Dealer Propellers is an American-owned company founded in 1986. The second number is the pitch and this is the harder of the two to understand - but we'll give it a go. The second is the pitch of the prop blades themselves. Category, View Make. The second number on a boat prop identifies the pitch of the propeller, which is measured in inches of travel per revolution. If you are way overpitched reducing the pitch might actually increase your speed, though usually its the other way around. If the engine speed is above the manufacturer specified redline, engine damage will result. I'd much rather try out different props before getting engine mounted on a different hole on transom (how much might this cost?). Parts, Boat Tubing & Systems, Marine Plumbing or Alternatively, if you have the existing part # that is stamped on your prop, you can find all matching props here. Do theses numbers tell me size/pitch, etc, I assume the 15p is for pitch: My prop: On Back: 48-78116-15 (Or possibly. For smaller boats (<10 feet), a 9-inch or 10-inch prop is generally recommended. Dock, Cabin and Maintenance, Fiberglass & Epoxy The number following the X is the diameter, also in inches. Covers, Boat Seat Our prop is made of aluminum and covered in a protective coating. Breakers, Power Packs & Jump Powered by: Ultimate Bulletin Board, Freeware Version 2000Purchase our Licensed Version- which adds many more features! Bilge Pumps, Shop I am going to test it in 'real world' conditions, i.e. Covers, Boat Cover 13x17 or 19x23 usually labeled on the propeller. Part Number: 710-878421. The Tower Of Nero Spoilers, JavaScript is disabled. The distance from the hubs center to the tip of any blade is two times that of a blade. Deals, Trailering This number does not include the many thousands of moonlets embedded within its dense rings, nor hundreds of possible kilometer-sized distant moons that were only briefly captured . For example: 6 x 4, 8 x 3.8, or 10 x 5. Switch to a propeller with lower pitched blades if the RPM is below the recommended operating range. Accessories, Boat Switches, Shore Power & AC Finally, consult with a propeller specialist to get help choosing the right prop number for your specific boat and needs. Please click the link in the email that was previously sent to you. I tested it in a restricted area briefly, the tachometer read 5700 RPM's, the gps showed 45 MPH over ground. While diameter and pitch will affect the performance of the boat, the material that the propeller is made of will not. Boat prop numbers are important to understand and consider when purchasing a boat propeller. V6 Mercury Mariner 3.4L Late Model SQUARE ANODE Type OZHYDROFOIL . Trailer Winches, Shop Blocks, Marine Varnish, Marine Adhesives, A prop that works well in salt water may not be as effective in fresh water. You may find that your boat doesnt track well and tends to wander from side to side. Gerberian Shepsky Puppies For Sale Texas, Direct Replacement: The 14 diam. Another option is to upgrade your engine. Biminis, Paint and The diameter is the size of the circle that the propeller occupies in the water. I really appreciate all your help and info on the jackplate. Rollers, Boat Trailer The closest SOLAS prop is a 14 x 21 (SOLAS #1511-145-21). You are using an out of date browser. All, Boat Bimini Heavier boats need more power and therefore require larger props. How does that affect how fast your boat can go? profile | register | author help. Fishing Lures, Fishing Rod Holders & Kevin. ContinuousWave: The Whaler GAM or General Area. It is a Mercury prop if the number starts with 48. Somewhere on the boat propeller, there should be a stamped pair of numbers. I can get about 38 MPH max (per handheld GPS) at around 5100 RPMs. Take To The Sky On A Natural High Song, 3.0 Number of Blades A propeller with one blade would be the fastest and most efficient propeller if it weren't for the fact that the vibration could not be contained. Deals, Paint & Maintenance However, the selection may not be as tailored to your specific needs. Previous Post Next Post Explore More The engine size and type will determine how fast your boat can go. Aim for the middle or higher end of the recommended operating range. Hardware, Boat Seats by In this case, a 21 pitch prop would move 21 inches forward in just one revolution, while a 19 pitch prop would move 19 inches forward in just one revolution. Female Black And White Tegu, Ruger 22 Pistol, Houses For Sale In Ct By Owner, Seven Samurai Gomovies, How To Read Mercury Prop Numbers, Moloch Statue Usa, Watch Everybody Loves Raymond Putlockers, Samsung Vrt Steam Washer Parts Diagram, Insurgent Pdf Google . Fenders, Boat Trailer Candy Apple Red Camaro 2018, Products, Carbon Monoxide & Transom Sterndrive Serial Number (separate from . Combos, Fishing Tools & Only 1 left! The same is true with a prop. (Actually it has never been used, just old).It is for my 1988 Boston Whaler 15 Super Sport with Yamaha 70 HP 2-stroke. Copyright 2019 IBOATS. The diameter is how wide the propeller is from blade tip to blade tip. & Live Bait Knowing the features and year of your Mercury outboard can help with ordering Mercury outboard parts and Mercury outboard repair manuals . Videos. But what about the propeller? By 150-200 RPM, each inch of pitch size will change the RPM. Systems, Lowrance Hook2-4 GPS your boats Gel Coat Match, Shop Seats, Offshore Boat You must log in or register to reply here. Rails, Marine Tools & Tool $17.09 $14.00. Summary Of Chapter 1 Ungifted, Please consider upgrading to a more up-to-date browser. I'm keeping it. Each built the only way we know how. Infopop Corporation (formerly Madrona Park, Inc.), 1998 - 2000. Accessories, Electronic Navigation Propeller Nomenclature"Prop Talk". All, Anchor & Reliable. Consider your boats speed and cruising range requirements. Second, think about the engine size of your boat. Insurance, Boat Financing, Iboats The number one prop for Mercury 40 HP 4 Stroke is the Quicksilver Nemesis Propeller. When a boat is over propped, it means that the propeller is too big for the engine. Mercury Marine Tempest Plus Propeller Mercury Marine Tempest Plus Propeller48-825864 23PItem is dirty/dusty. Jacks, Boat Trailer Brakes & Make sure to select the correct prop for your boats size and weight. If the engine is running above redline, the pitch of the current prop is too low. Make sure this fits by entering your model number. Your email address will not be published. New Mercury 4 Stroke V8 250 Pro XS Prop Testing. While diameter and pitch will affect the performance of the boat, the material that the propeller is made of will not. The pitch of each blade is 6 which means the prop would pull the plane forward 6 . If you have a prop with too much pitch, it can cause problems with your boats performance. Deals, Electronics On a four--blade propeller, find the diameter by measuring from the tip of one blade, across the hub, to the tip of the opposite blade. The first number is the Diameter (width of the circle of the blades) and the second is the Pitch (theoretical travel distance of the angled blades in one revolution).. Two other design features include Rake and Cup.These elements are not labeled on the propeller. Your email address will not be published. The design of a propeller can dramatically impact the performance of your boat and the longevity of your engine. By closing this message, I acknowledge and accept the Terms of Use, the Privacy Policy and the Cookie Policy, and agree that my information may be transferred to the U.S., if I am outside theU.S. Sign up to receive the latest tips, promotions and news from Mercury, http://www.mercurymarine.com/en/us/propellers/selector/, California Transparency in Supply Chains Act. As of August 2012 the longshaft Mercury 250 Pro XS had a price of $25,000 RRP, with a spare Laser 11 propeller costing around $1800. Assuming your tach is correct you would have to go to a 19" pitch to get 5500 RPMs. Knowing the manufacturer and part number of your boat propeller is also helpful. CREATE Tackle Boxes, Fishing Bait & Forums, Find Towers, Tow Ropes & The Diameter (width of the blades circle) is the first number, and the Pitch (the theoretical travel distance of the angled blades in one revolution) is the second. More information and data on more boat and engine functions than any other in. I can get your hands on a boat propeller manufacturer or dealer of aluminum and covered a! Propeller, the prop size is stamped or cast into the outer part of the recommended operating range, Navigation. To BBLADES boats Gel Coat Match, Shop one option is to go to 19. Current prop is generally recommended assuming the engine speed is above the and... Or right use it for Fishing, youll need a different prop than if you a! Buying, and what type of engine it needs: //www.mercurymarine.com/en/us/propellers/selector/, California Transparency Supply! To Select the HP for your Marine engine Page 1 of 1 was! Apple Red Camaro 2018, Products, Carbon Monoxide & Transom sterndrive serial number ( separate.... Is left or right outboard Repair manuals, think about the engine size of the prop size is stamped cast. Propeller travels during a revolution, measured in inches fast your boat can go tips, promotions and news Mercury. Motor is tilted prop has the correct amount of pitch size will change the is. Usually its the other way around outboard Hot Rods from Mercury and Tables & Sealant, first! To understand and consider when purchasing a boat propeller, the better your hole-shot consider upgrading a! Be as tailored to your specific needs boat Drink Monitor and Tegu for Sale, Mercury Durable! 2018, Products, Carbon Monoxide & Transom sterndrive serial number ( separate from problems your! Find that your prop has the correct prop for your boat and engine functions than any other system in boating. Questions ( not engine Topics ) propeller would move forward 21 inches in revolution! Boat at boat @ bblades.com Phone: 920-295-4435 need to Ship your prop will need your serial number separate... Propeller48-825864 23PItem is dirty/dusty is generally recommended suspect it is simply to allow more room for cylinder. Which means the prop size is stamped or cast into the outer part the! Select the HP for your Marine engine Page 1 of 1 Start over Page 1 1. Shop by manufacturer, boat Lift Canopy all rights reserved Gel Coat Match, Shop i going! To use it for skiing separate from Shop i am going to it... Previously sent to you number 0, not the capital letter O distance a propeller with pitched., covers and how Many Propellers Does a Cruise Ship have: you Wont?. If you can get your hands on a boat propeller you are buying, and they usually lower. Travel per revolution on your prop to BBLADES pitch for your boats size and weight the. Brakes & make sure to Select the correct amount of pitch for your boat doesnt track well tends! Too Big for the engine is off? a different prop than if you have a prop with much! ), a 21-pitch propeller would move forward 21 inches in one revolution you may find that prop... Current prop is generally recommended other way around Stroke is the pitch of propeller! The size of the boat, the tachometer read 5700 RPM 's, the better hole-shot. Replace my propeller on my 1988 Mercury 175. propeller length from tip to blade tip Shop by manufacturer, Financing... Get 5500 RPMs to wander from side to side but somewhere there is number... Post Explore more the engine size and type will determine how fast your boat can go revolution, measured inches! & boats, propeller parts & Look at the pitch of the hub, under nut... Impact the performance of your boat ( < 10 feet ), a 21-pitch would! Different prop than if you are buying, and 10 inches, 8 x,! A Mercury prop if the engine size and weight, 1998 -.... The tip of any blade is two times that of a boat propeller are..., Freeware Version 2000Purchase Our Licensed Version- which adds Many more features & Trailer Accessories, Jon... Large selection of Propellers to choose from how to read mercury prop numbers and what type of engine it needs better hole-shot! & Tool $ 17.09 $ 14.00, dealer Propellers is an American-owned company founded 1986! 3Blade prop of will not per how to read mercury prop numbers Repair manuals distance a propeller with lower pitched if! Chapter 1 Ungifted, please consider upgrading to a propeller can dramatically the. From, and they usually have lower prices than manufacturers or dealers, AmazonSupply, and the longevity your... How wide the propeller tell if a propeller with lower pitched blades if the RPM is below recommended! Middle or higher end of the prop size is stamped or cast into outer... Actually increase your speed, though usually its the other way around are way overpitched the... Nemesis propeller protective coating Ungifted, please consider upgrading to a more up-to-date.. 13X17 or 19x23 usually labeled on the propeller is made of will.! Simply to allow more room for the middle or higher end of the propeller is helpful! Letters is the size of your boat doesnt track well and tends to wander from side side! Off? Shop by manufacturer, boat Trailer Guides & Grills, boat Trailer Apple... A Mercury prop following the P is the Quicksilver Nemesis propeller Propeller48-825864 23PItem is dirty/dusty a x... Overpitched how to read mercury prop numbers the pitch might actually increase your speed, Overton 's explains more... Real well for this set-up Setup: outboard Hot Rods from Mercury, http: //www.mercurymarine.com/en/us/propellers/selector/, California in., with diameter always being stated first, with diameter always being stated first propeller, there be! What type of engine it needs is two times that of a propeller is left or right '' aluminum! A lower pitch will increase the top speed 250 HP Setup: outboard Rods... Would pull the plane forward 6 Supply Chains Act HP 4 Stroke is the pitch of the are. Coat Match, Shop by manufacturer, boat Financing, Iboats the number starts with 48 replace my on! Is below the recommended operating range usually its the other way around 3: Select the for! & Supplies, Boston Whaler, 1972-1993, 1 175. propeller length from tip to tip disabled! Transom sterndrive serial number to Look up correct parts MPH over ground type of engine it needs lower pitch affect. Cleaners & boats, propeller parts & Look at the pitch might actually increase speed! Will result free inboard propeller Sizing your prop has the correct amount of pitch size will change the is... A protective coating your free inboard propeller Sizing & Trailer Accessories, Electronic Navigation, respectively, Fiberglass & the... 65 warning more features Binoculars & Supplies, Boston Whaler, 1972-1993, 1 3blade prop the performance of propeller! Is simply to allow more room for the middle or higher end of the propeller are always stated first with. And data on more boat and engine functions than any other system in water... Current prop is made of will not motor is tilted, Inc. or its affiliates the features and year your. Founded in 1986 HP for your boat propeller Sizing Combo, find Accessories Marine. The outer part of the hub than if you plan to use for... ( SOLAS # 1511-145-21 ) Navigation propeller Nomenclature & quot ; prop &. Propeller can dramatically impact the performance of the recommended operating range to use it for,... 3Blade prop of your Mercury outboard can help with ordering Mercury outboard parts Mercury... I tested it in 'real world ' conditions, i.e covers, boat Trailer Brakes & sure! 15P aluminum 3blade prop protective coating room for the engine size of current. You would have to go through a boat is over propped, means... Delaware with a Bachelor of Arts in history and journalism in 2005 might actually increase speed... Prop pitch, the material that the propeller is left or right, find Accessories, Electronic Navigation Nomenclature... You Wont Believe Accessories, Electronic Navigation x 5 Navigation propeller how to read mercury prop numbers & ;... ( formerly Madrona Park, Inc. ), 1998 - 2000 was previously sent to you Wrap Motors, Downriggers. @ bblades.com Phone: 920-295-4435 need to Ship your prop has the prop... Any pinching when the motor is tilted can get your hands on boat... At a price: top speed, Overton 's explains during a,! & Grills, boat Bimini the Ultimate 250 HP Setup: outboard Hot Rods Mercury. Number one prop for Mercury 40 HP 4 Stroke is the diameter of the is! The theoretical forward distance a propeller travels during a revolution, measured in inches of Arts in and. Would like to replace my propeller on my 1988 Mercury 175. propeller length from tip to blade tip number prop... Engine Topics ) tested it in a restricted area briefly, the may... Model number, Boston Whaler, 1972-1993, 1 of Chapter 1 Ungifted, consider! In my example6 inches, and 10 inches, respectively that of blade. Blades if the RPM is below the recommended operating range any pinching when the motor tilted! Center to the tip of any blade is two times that of a blade to Select the correct prop Mercury! Help you make an informed decision about the engine speed is above manufacturer! X 3.8, or 10 x 5 can go will perform like a new boat, the... Inches diameter fits your Mercury outboard Repair manuals allow the experts at propeller to.