Boats have COUNTER-ROTATING PROPELLERS: This is an example of an inboard vessel with twin engines. This is called a twin screw. Each propeller spins counter to one another when they are in forward. This mitigates what is called side effect. If both propellers spin the same way when in forward, the boat would drift to one side, causing the captain to need to correct steering often.#howtoboating #howto #boating #boat #yachting #yacht #driving #drive #props #right #left #inboard | How to boating

Check-out the counter-rotating propellers on the Westland Wyvern! #avpay #westland #aviation #aviationdaily #aviationgeek #fleetairarm #aviationhistory | AvPay.aero

What are COUNTER-ROTATING PROPS: There is a big difference between these two boats. The first boat shown has one prop for each engine. Each engine spins counter to one another to avoid side effect. If both props spin the same way in forward, the stern will drift to one side, making a difficult to handle. The other vessel has two engines with two props each. Each engine has its own counter rotating blades. #howtoboating #howto #boating #propellers #props #engines #blades #captain #sideeffect #wal