What is a helix screw advancing a propeller?

If a propeller were a helix screw advancing in a solid, then for each revolution it would advance a distance equal to the pitch of the blades, called the speed of advance. The boat speed would then be the speed of advance.

What is a pitch value on a propeller?

For example, 0.542 becomes 1/0.542 or 1.845. A value for PITCH is typically a known parameter, and should be taken from the propeller markings or the manufacturer part number. Calculating a value for PITCH is useful if the four other parameters are known with certainty.

🏅 Best Boat Propeller For Speed

continuousWave Propeller Calculator in MPH

· Older analogue dial-pointer tachometers are notoriously inaccurate. Use the manufacturer's recommended highest permitted engine speed to calculate highest possible boat speed estimates. A value for RATIO is typically input as a known parameter. The manufacturer's data should be used.

3 days ago

Crouch's Calculator - ContinuousWave

· Foundation The calculator uses known inputs of propeller shaft horsepower (HP) and total boat weight (LBS), and an estimated hull factor coefficient (C), and from these three parameters the boat speed (SPEED) is calculated The relationship is expressed mathematically: HP SPEED = ( --- )^0.5 × C LBS

6 days ago

UK Consortium to develop Ultra-Efficient Electric Boats

· Teignbridge Propellers announce the collaboration with Optima Electric Yachts on the pioneering Ultra-Efficient Electric Boat project, funded by the Department for Transport (DfT), United Kingdom, and Innovate UK. Monday, February 19, 2024 ...

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twin prop'd boats - which way should prop's turn? - Model Boat Mayhem

· The next photograph, (see picture C) shows a modern ship, propellers are in ‘pods’. If you note that the propellers on this vessel turn inboard, and, also the propellers’ face forward to the bow of the ship, this in turn gives more efficiency from the electric drive motors in the pods.

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The Best Saltwater Trolling Motor Ever Made: 8 Reasons Why Riptide ...

· The Best Saltwater Trolling Motor Ever Made: 8 Reasons Why Riptide Instinct Is the King Not only is the Riptide Instinct™ QUEST™ the only auto-stow and deploy trolling motor on the market, but it also features a unique and thoughtful design and powerful capabilities to bring ultimate boat control to saltwater boats of all sizes and designs.

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Lundberg Propellers

· Suitable for most inboard boats through all rev ranges, a good all round propeller. River-rat: An Excellent 4 blade propeller designed for those narrow waterways where tight turning can often create prop-override. The river-rat has great acceleration, speed and handling and is already a very popular river skier’s choice. Quality Control

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JXF Electric propellers from 4-Max

· IIDJ Series JXF Beech High Performance Electric Propellers We hold the largest selection of these props in the UK These JXF props are made to the highest standards. They are specifically designed for electric flight and are manufactured from premium grade Beech wood which is both strong and very light (lighter then APC electric props)

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Pod Propulsion - MarineLink

· Pod Propulsion Pods are devices which combine both propulsive and steering functions in one device.

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· Best British Prop Trading Firms. City Traders Imperium. Best overall, especially for traders seeking tailored educational resources. InstantFunding.io. Ideal for those looking for quick access to trading capital. FTUK. Great for traders who value flexible trading strategies. Trade the Pool. Suitable for traders focusing on forex and algorithmic ...

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· The free prop picks here are made following 1000s of simulations. The higher the edge, the better! Find Prop Bets All Sports Sort Picks By Game Time Edge Timeframe 24 Hrs 72 Hrs 7 days FanDuel BetMGM DraftKings bet365 Last Updated: 1:46AM, Feb 16 Add game to Shortlist CBB • VILL vs. GTWN • Feb 16, 4PM Jayden Epps u14.5 PTS Probability: 55.0%

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PropStarz. An experienced poker player, Alex Selesnick (aka PropStarz) specializes in NFL, MLB and NBA prop betting, where he implements a combination of research, statistical analysis and mathematical modeling. He is arguably the nation's No. 1 props expert. Since joining CBS Sports in 2021, PropStarz has delivered consistent winners on ...

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Best Boat Propeller Brand

10 Best Boat Engine Propellers | Sports & outdoors | Recombu

· 10 Best Boat Engine Propellers Updated 27th December 2023 Recombu Best Lists Sports & outdoors Sports Boat Engine Propellers BODAO Outboard Boat Motor Propeller, Aluminum...

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Lundberg Propellers

· All Lundberg propellers have been put through extensive water testing on a large range of inboard ski boats to extract the best balance of speed to revs while mindful of fuel efficiency. All our propellers are put through quality control tests to ensure you are receiving the best value for money. We guarantee you will be happy with the results.

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twin prop'd boats - which way should prop's turn? - Model Boat Mayhem

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· YouTuber Emmanuel Williams recently caught a swordfish off this very boat. $20,499. Best Foiler: Valo Hyperfoil. ... More From Our Brands. WWD Swan Mentality Dominates for Evening During NYFW Fall ...

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Oceanvolt Servoprop - Plugboats

· The ServoProp is suitable as a propulsion motor for monohulls up to 50 ft & multihulls up to 60 ft. It can also be used as a hydro generator in boats up to 100 ft. The patented Oceanvolt ServoProp variable pitch sail drive combines a high efficiency sail drive with the most powerful hydro generator on the market. The.

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· Duckworth. Built in Clarkston, Washington, Duckworth makes some of the biggest ocean-going aluminum fishing boats around. The largest boasts a 34’1” LOA, and Offshore and Pacific Pro models have full cabins, elbow room for plenty of anglers, and more fishing options than we can list out here. Duckworth 30 Offshore XL.

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· Welcome to Dusky Welcome aboard DUSKY MARINE, the home of custom built sport fishing boats. Since 1967, DUSKY MARINE has been a family success story; an enduring partnership in family and boat-building craftsmanship. All Duskys are custom built boats. Our extensive boat options list lets you customize your boat to your exact specifications.

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High Speed Boat Propeller

Ultra-Efficient Electric Boat | Teignbridge Propellers International ...

· Speed@Seawork on Monday 10 June in Cowes offers a sector specific event that showcases fast vessels operating at high speed for security interventions and Search & Rescue. ... Seabird Technologies are developers of the cutting-edge foiling electric race boat E1 series. Teignbridge Propellers, one of the UK’s leading experts in propulsion ...

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continuousWave Propeller Calculator in MPH

· Generally the calculated SLIP will tend to reduce to the range of 5 to 10 only when the propeller is working to push the boat to its highest boat speed range. At lower boat speeds SLIP will often be much higher, in the range of 10 to 30. If SLIP is to be an entered parameter, a reasonable guess at its value is 10.

3 days ago

Oceanvolt Servoprop - Plugboats

· A normal fixed propeller (that by nature does not have the blades ideally shaped for regeneration) generates less than half the power of ServoProp at a given boat speed. ServoProp is capable of generating more than 1 kW at 7-8 knots & 3 kW at 11-12 knots.

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Best Propeller For Top Speed

Crouch's Calculator - ContinuousWave

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continuousWave Propeller Calculator in MPH

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Author Topic: Toroidal Propellers (Read 1285 times)

· Re: Toroidal Propellers. « Reply #5 on: February 11, 2023, 10:18:22 am ». They are very complex shapes. As Greg says, a lot of experimentation would be needed to explore performance options. This would seem to suggest that you would need to have a 'tweakable' CAD pattern and access to a 3D printer capable of printing metal.

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JXF Electric propellers from 4-Max

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Mitchell developed the Spitfire's distinctive elliptical wing (designed by Beverley Shenstone) with innovative sunken rivets to have the thinnest possible cross-section, achieving a potential top speed greater than that of several contemporary fighter aircraft, including the Hawker Hurricane.

Vought F4U Corsair - Wikipedia

The Vought F4U Corsair is an American fighter aircraft that saw service primarily in World War II and the Korean War.Designed and initially manufactured by Chance Vought, the Corsair was soon in great demand; additional production contracts were given to Goodyear, whose Corsairs were designated FG, and Brewster, designated F3A.. The Corsair was designed and operated as a carrier-based aircraft ...

Most Efficient Boat Propeller

Ultra-Efficient Electric Boat | Teignbridge Propellers International ...

· Teignbridge Propellers are excited to be collaborating with Optima Electic Yachts on their Ultra-Efficient Electric Boat project funded by Department for Transport (DfT), United Kingdom and Innovate UK. ... Building on Teignbrdige’s successful CMDC round one project, we are developing a high efficiency propeller design suitable for electric ...

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twin prop'd boats - which way should prop's turn? - Model Boat Mayhem

· To date, propellers are the most efficient way of moving a vessel through the water, by converting the shaft horse power into thrust. Please see the pictures I have included below. One of these photographs (see picture A) is from the early 1900’s, this shows an early Cruiser. The propellers here are rotating inboard.

4 days ago

Crouch's Calculator - ContinuousWave

· The propeller efficiency is assummed to be in the range of 50 to 60-percent. Propeller efficiency is not a parameter in the calculator, nor do most recreational boaters have any method to measure or know propeller efficiency. A more complex speed prediction formula is offered by Gerr in his Propeller Handbook, mentioned below. Acknowledgements

6 days ago

New propeller boss cap is 5% more efficient thanks to…. holes

· New propeller boss cap is 5% more efficient thanks to…. holes 2024-02-16T11:01:00 New cap dispenses with fins and instead uses a series of holes drilled into the metal

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VIDEO: New propeller boss cap promises major efficiency gains

· Silver Ships delivers first Endeavor 32 fire rescue boat; Moran tugboat crew honored for rescue efforts; First fully electric tugboat in U.S. delivered to Crowley; Dredging. ... compared to the propeller boss caps currently available, HBC improved propeller efficiency by 3.1% and thrust by 1.1%, while reducing torque by 2%, rudder cavitation by ...

4 days ago

Oceanvolt Servoprop - Plugboats

· ServoProp is capable of generating more than 1 kW at 7-8 knots & 3 kW at 11-12 knots. The power generated can be used to power both the propulsion system as well as all the electronics on board without the need to have a separate generator. With this in mind we can definitely start talking about the possibility of a totally self-sufficient cruiser!

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5 Revolutionary Marine Diesel Engine Advancements in Modern Shipping

· The air induction and compression lead to fuel injection and consequent combustion, driving the pistons, crankshaft, and ultimately moving the vessel’s propellers. Marine Diesel Engines: Fuel Efficiency Champions. One of the most celebrated attributes of marine diesel engines is their remarkable fuel economy.

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High Efficiency Boat Propeller

Ultra-Efficient Electric Boat | Teignbridge Propellers International ...

· Building on Teignbrdige’s successful CMDC round one project, we are developing a high efficiency propeller design suitable for electric propulsion systems. ... Source: Teignbridge Propellers. The boat is a progression of Optima yachts to be used as a passenger ferry with 10 to 12 passengers.

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Oceanvolt Servoprop - Plugboats

· The patented Oceanvolt ServoProp variable pitch sail drive combines a high efficiency sail drive with the most powerful hydro generator on the market. The unique feature of the ServoProp is the possibility to turn the propeller blades more than 180 degrees.

6 days ago

Mercury Avator 20e and 35e Electric Outboards | Boating Mag

· Advantages include increased low-speed torque and efficiency, maximizing battery life and range. Mercury says that the 20e, producing 2.2 kW of power at the prop shaft (comparable to just under 3 hp) delivers performance closer to its 5 hp gas four-stoke. The 35e, generating 3.7 kW of power (comparable to 5 hp), compares to the 9.9 hp gas model.

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· Miami, Fla. – February 14, 2024 – Yamaha Motor Corporation, U.S.A. today unveiled the world’s first hydrogen-powered outboard for recreational boats along with a prototype fuel system integrated into a vessel that the company plans to further refine for testing later this year. The effort is part of Yamaha’s strategy to achieve carbon neutrality: deploying multiple technology solutions.

5 days ago

Plugboats Guide to Electric Boats Exhibitors: Miami International Boat ...

· The 2024 Miami International Boat Show (MIBS) starts this Wednesday, and like all boat shows, it has an increasing number of electric boat and boating ... The motor is notable because it has no propellers. It uses a fin-like undulating membrane based on the movement of dolphins to create thrust. ... The high-efficiency brushless motor operates ...

Feb 12, 2024

Holy Boss Cap propeller hub delivers on fuel efficiency

· “The Holy Boss Cap eliminates completely propeller hub vortex cavitation, the main source of rudder erosion, and reduces associated propeller efficiency losses, which can be as much as 8%. “Considering the investment levels required for other energy saving devices currently in the market and the potential fuel savings, Holy Boss Cap is a game changer with and ROI of less than six months ...

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Propeller boss cap claims 5 per cent performance improvement on ...

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The Best Propeller For My Boat

10 Best Boat Engine Propellers | Sports & outdoors | Recombu

· 10 Best Boat Engine Propellers Updated 27th December 2023 Recombu Best Lists Sports & outdoors Sports Boat Engine Propellers BODAO Outboard Boat Motor Propeller, Aluminum...

Feb 12, 2024

twin prop'd boats - which way should prop's turn? - Model Boat Mayhem

· « Reply #1 on: October 17, 2007, 03:41:46 pm » Hi RipSlider You will get many different replies on thi probably. On my boats the twin props turn in as we found it improves the steering. If you are only concerned with speed have them turning out. Logged Richard Solent Radio Controlled Model Boat Club http://www.srcmbc.org.uk Shipmate60

4 days ago

continuousWave Propeller Calculator in MPH

· This useful calculator computes the speed-of-advance of a propeller based on: engine crankcase speed in RPM; engine gear reduction RATIO expressed as n :1; and propeller PITCH, in inches.

3 days ago

Crouch's Calculator - ContinuousWave

· The basis for the calculations embodied in the calculator comes from the work of naval architect George Crouch, as described by author Davd Gerr in his book "Propeller Handbook" (published by International Marine) in Chapter 2, pages 15 and 16 where it is referred to as Crouch's Planing Speed Formula.

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Lundberg Propellers

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Oceanvolt Servoprop - Plugboats

· Oceanvolt Servoprop Motors / Oceanvolt The patented Oceanvolt ServoProp variable pitch sail drive combines a high efficiency sail drive with the most powerful hydro generator on the market. The unique feature of the ServoProp is the possibility to turn the propeller blades more than 180 degrees.

6 days ago

Looking for best prop : r/Pontoons - Reddit

A community for people that love their pontoon boat - to share stories, ask questions, and celebrate the best type of boat on the lake! ... and celebrate the best type of boat on the lake! ... ADMIN MOD Looking for best prop . I have a Yamaha T25. We run on a small lake. I get about 10 mph. Looking to do better. Currently use a 9-7/8 x 8 prop ...

Best Boat Propeller For My Boat

continuousWave Propeller Calculator in MPH

· This useful calculator computes the speed-of-advance of a propeller based on: engine crankcase speed in RPM; engine gear reduction RATIO expressed as n :1; and propeller PITCH, in inches.

3 days ago

New propeller boss cap is 5% more efficient thanks to…. holes

· Insight | Ancasta - How to drive new boat sales By Jake Kavanagh, Subscriber-only. Insight | On common ground: platform sharing in boat building By Craig Ritchie, Subscriber-only. Companies. ... New propeller boss cap is 5% more efficient thanks to…. holes. 2024-02-16T11:01:00.

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· The designer hit a sweet spot with this boat and created a wonderful balance between performance in all weather conditions, comfortable sea-keeping qualities, seaworthiness and roominess below decks. The best route to sail around the world. The route of my circumnavigation was the traditional tradewind route from west to east.

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twin prop'd boats - which way should prop's turn? - Model Boat Mayhem

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· 10 Best Boat Engine Propellers Updated 27th December 2023 Recombu Best Lists Sports & outdoors Sports Boat Engine Propellers BODAO Outboard Boat Motor Propeller, Aluminum...

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Crouch's Calculator - ContinuousWave

· Crouch's Calculator The calculated value is indicated by the shaded heading in the table. This useful calculator computes an estimate of boat speed for a modern planing monohull using inputs of the power at the propeller shaft, the total boat weight, and a coefficient called the hull factor.

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Lundberg Propellers

· STD: Tried and tested standard propeller manufactured by Lundbergs for over 40 years. Suitable for most inboard boats through all rev ranges, a good all round propeller. River-rat: An Excellent 4 blade propeller designed for those narrow waterways where tight turning can often create prop-override. The river-rat has great acceleration, speed ...

5 days ago

Best Boat Propeller Manufacturer

Ultra-Efficient Electric Boat | Teignbridge Propellers International ...

· Seabird Technologies are developers of the cutting-edge foiling electric race boat E1 series. Teignbridge Propellers, one of the UK’s leading experts in propulsion design and manufacturing. ... We have been a world leading designer and manufacturer of propellers and shaftlines for over 40 years. Our high performance C’Foil design provides ...

14 hours ago

Lundberg Propellers

· Lundberg Propellers is a family run business, which has earned an impeccable reputation for highest quality engineering of inboard boat propellers and related components, for four generations – that’s over 85 years! "POWER BOAT & YACHTING article 1956" Its humble beginnings were in Newtown, Sydney, in 1920 when Emil Lundberg, hand-built a skiff named Miss Florence and after many hours of ...

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Lundberg Propellers

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twin prop'd boats - which way should prop's turn? - Model Boat Mayhem

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Company

· McCauley is one of the world's largest full-line propeller manufacturers, with over 500 models available. Historically, our propellers are FAA certified as original equipment for aircraft built by Hawker Beechcraft, British Aerospace, Cessna, Fairchild, Grumman, Jetstream, Piper, Stoddard Hamilton and many others.

3 days ago

New propeller boss cap is 5% more efficient thanks to…. holes

· Innovation paying dividends for manufacturers By Belinda Snell ... IBI’s A-Z guide of the key boat launches. boot Düsseldorf lays out stall for 2024. 1st Superyacht Summit Turkiye to be held next week ... Topics. New propeller boss cap is 5% more efficient thanks to…. holes. 2024-02-16T11:01:00. New cap dispenses with fins and instead uses ...

3 days ago

continuousWave Propeller Calculator in MPH

· Use the manufacturer's recommended highest permitted engine speed to calculate highest possible boat speed estimates. A value for RATIO is typically input as a known parameter. The manufacturer's data should be used. If the manufacturer specifies the reduction ratio as a single decimal number between 0 and 0.999, use the reciprocal of that number.

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twin prop'd boats - which way should prop's turn? - Model Boat Mayhem

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Top 5 Best Rc Servos 2024 - Guides by RebateKey

· Deegoo [4-Pack] MG996R 55g Metal Gear Torque Digital Servo Motor for Futaba JR RC Helicopter Car Boat Robot; ... The best RC servo should have a good speed, torque, and precision. It should be durable, reliable, and capable of responding swiftly to the commands. Using a subpar servo can result in poor performance, inaccurate control, and even ...

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Connecting motor to prop shaft - Model Boat Mayhem

· Full Mayhemer Offline Posts: 7,625 Location: Newport. S Wales Connecting motor to prop shaft !!! « on: August 17, 2015, 11:22:49 am » The latest way of fitting a connection joint between the motor and the prop shaft seems to be a 'push fit' rubber tube. These have the advantage of being smooth and rattle free.

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JXF Electric propellers from 4-Max

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· Today's deals end in 00 08 53 20 View on Amazon Range: £5 £12 Advertising Disclosure Best Rc Boat Propeller Deals Online in the UK Last Updated - 14/02/2024 Sort By: Top relevant Best Choice RC Boat 4-Blade Propeller, 4 * 60mm CW CCW RC Propeller Rc Boat Part Rc Boat Accessories Rc Boat Engine Boat Accessory (Black) New

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· Prop Selection and Replacement. Universal Sonar 2. Dual Spectrum CHIRP. View All. ... maneuver, and control even larger boats than ever before. The Riptide Instinct has a variety of shaft lengths to best fit your boat, no matter the size. Available in sizes starting at 60” all the way up to 100” to offer ultimate boat control to skiffs, bay ...

Feb 12, 2024

Help me understand motor/prop choice : r/RCPlanes - Reddit

Other way around, lower Kv spins slower and typically is used with a larger prop or higher voltage battery. You are calculating Watts correctly though. You might take a look at motor prop charts that show thrust generated and power/current at various voltages. Something like this:

High Performance Boat Propellers

A Comprehensive Guide to Boat Propellers | Power Products Blog

· For most boats, a 3-blade propeller is the best all-around choice. 4 and 5-blade props may provide some performance benefits but are more complex and expensive. Aluminum props are the most common and cost-effective choice for most applications. Stainless steel and composite props offer increased durability and performance but at a higher cost.

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Ultra-Efficient Electric Boat | Teignbridge Propellers International ...

· Our high performance C’Foil design provides anti-cavitation characteristics, whilst delivering unrivalled maximum performance. Request information. ... Seabird Technologies are developers of the cutting-edge foiling electric race boat E1 series. Teignbridge Propellers, one of the UK’s leading experts in propulsion design and manufacturing.

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continuousWave Propeller Calculator in MPH

· This useful calculator computes the speed-of-advance of a propeller based on: engine crankcase speed in RPM; engine gear reduction RATIO expressed as n :1; and propeller PITCH, in inches.

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Best Stainless Steel Boat Propeller

VIDEO: New propeller boss cap promises major efficiency gains

· Tests also assessed the patent-pending HBC against more advanced energy efficient boss caps currently in operation, and found the HBC at least 3% more efficient. “Overall, compared to the propeller boss caps currently available, HBC improved propeller efficiency by 3.1% and thrust by 1.1%, while reducing torque by 2%, rudder cavitation by 10% ...

4 days ago

twin prop'd boats - which way should prop's turn? - Model Boat Mayhem

· Currently I'm building a twin proped boat. If I look at from the rear, so that the prop's are facing me, should the prop's turn in to each other (left prop clock wise), or away from each other ( left prop anti clock wise) ? I have fitted L/H and R/H prop's on the respective sides. Many thanks.

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Nauticalloy Marine Propeller Shafting Tolerances

· 0.00689. Newtons per Sq. mm. Pounds per Sq. Inch. 0.00689. Download the above information in a PDF format here. Millstock are stainless steel products stockists and processors, offering fast and efficient stainless steel products and services supply and delivery.

Feb 12, 2024

NEW PROPELLER CAP DESIGN ENHANCES PROPULSION EFFICIENCY

· The Holy Boss Cap eliminates completely propeller hub vortex cavitation, the main source of rudder erosion, and reduces associated propeller efficiency losses, which can be as much as 8%. Considering the investment levels required for other energy saving devices currently in the market and the potential fuel savings, Holy Boss Cap is a game changer with and ROI of less than six months.”

3 days ago

continuousWave Propeller Calculator in MPH

· continuousWave Propeller Calculator in MPH Propeller Calculator: MPH The calculated value is indicated by the shaded heading in the table. This useful calculator computes the speed-of-advance of a propeller based on: engine crankcase speed in RPM; engine gear reduction RATIO expressed as n :1; and propeller PITCH, in inches.

3 days ago

Powertech 4 blade stainless steel propeller BRV4R27PMS275 | eBay

· Powertech 4 blade stainless steel propeller BRV4R27PMS275 Blazer Boats (7) 88.9% positive Seller's other items Contact seller US $550.00 $45.83 for 12 months with PayPal Credit * Condition: New Buy It Now Add to cart Add to watchlist Shipping: FreeStandard Shipping. See details

5 days ago

SUZUKI PROPELLER - 3 Blade 15x21L - boat parts - craigslist

· 🚩 SUZUKI PROPELLER - 3 Blade 15x21L ... $350 *BEST OFFER Boat Propeller, Propeller, Boats, Stainless Steel, Boat Parts, Boating Specifications Propeller Specs 3x15x21L Number of Blades 3 Propeller Diameter 15 "Propeller Pitch 21 "Number of Splines 15 Material Stainless steel Setting on Shaft Splines Rotation Left Brand Suzuki Made in Japan

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Most Efficient Boat Propeller Design

Ultra-Efficient Electric Boat | Teignbridge Propellers International ...

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Design and static analysis of 3-blade marine propeller

· Fibre reinforced polymer composites in recent times are finding wide spread use in naval applications. Ships and under water vehicle requires propeller to drive the vehicle. The propellers are used as propulsions and it also used to develop indicative thrust to propel the vehicle at its viable speed and rpm.

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VIDEO: New propeller boss cap promises major efficiency gains

· TAI Engineers names Amer Kalla director of production design; Op-Ed: Engineering insights when building a trawler ... Silver Ships delivers first Endeavor 32 fire rescue boat; Moran tugboat crew honored for rescue efforts ... “Overall, compared to the propeller boss caps currently available, HBC improved propeller efficiency by 3.1% and ...

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New propeller boss cap is 5% more efficient thanks to…. holes

· New propeller boss cap is 5% more efficient thanks to…. holes 2024-02-16T11:01:00 New cap dispenses with fins and instead uses a series of holes drilled into the metal

3 days ago

continuousWave Propeller Calculator in MPH

· This useful calculator computes the speed-of-advance of a propeller based on: engine crankcase speed in RPM; engine gear reduction RATIO expressed as n :1; and propeller PITCH, in inches.

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FAQS