Physics of Docking - The Prop

[@bigdukepod]

Gentlemen, GREAT Information! Thanks for sharing your expertise!

[@JeffMerrillYachts]

Big Duke - THANK YOU for your nice comment. Very sorry for the delayed reply -didn't see this until now. Appreciate you taking the time to write!

[@captainrick9379]

Excellent video! Keep up the good work! And thanks for sharing!

[@JeffMerrillYachts]

Thank you Captain Rick, glad you liked it and we have more to share coming up!

[@larrypatterson3957]

Excellent information. Thanks for taking the time to share.

[@JeffMerrillYachts]

Thank you Larry!

[@cq7415]

Excellent information, thanks for sharing.

[@JeffMerrillYachts]

C Q: Thank you for watching.

[@user-kn5wh5cg2g]

Very good. Learn something new everyday.

[@JeffMerrillYachts]

Thank you for watching and glad it was helpful!

[@ApolloDL4]

Great series to watch.

[@JeffMerrillYachts]

Thank you for watching and commenting ApolloDL4!

[@crustyolcoot6646]

thankyou for making it so clear. Now i will know exactly why i have just clipped the other guys boat.

[@JeffMerrillYachts]

Not Guilty, I get it, take it slow. Thanks for watching!

[@teachingrounds]

Great content

[@JeffMerrillYachts]

Teaching: Thank you for watching and commenting!

[@bjnr0]

Super stuff!!! Instant subscriber 👍🍀

[@JeffMerrillYachts]

Thank you Random, really love comments like that! More videos in the works!

[@jamiemcneil9462]

I gave up boating because every time I tried to go some where I crashed into at lest 3 different boats. I was not the most favorite boat owner in the marina.

[@JeffMerrillYachts]

Jeff Merrill • 3 years ago Jamie - that doesn't sound like much fun. Docking is the hardest part and something that takes practice to master. Thrusters can help out, but you can't rely on them.

[@peterkelly6232]

One question to this Prop Walk is what happens when you have twin Engines

[@JeffMerrillYachts]

Peter: Twin engines usually counter rotate - one side rotates clockwise, the other counter. So if you have one in neutral you can get some walking movement from the other. Twins are much more maneuverable

[@dgeorge852]

Question: On a single shaft that has counter rotating props, can you still get prop walk?

[@jeffmerrill1135]

Good question! I guess they will mostly counteract each other for minimal effect unless one is rotating more forcefully. Do you have a specific example?

[@dgeorge852]

@@jeffmerrill1135 2003 34 ft Rinker. It has dual shafts but two counter rotating props on each. Oh, it's also a stern drive. It's up for winter storage right now so I can't try it right now.

[@kenlee-97]

@@dgeorge852 U tell me buddy!, your a Captain in the marines!, nah seriously a twin sterndrive 34 flybridge cruiser like your Rinker shall have some transverse thrust as the props are a similar diameter/pitch to a twin shafts 34 Rinker hull .(M-24, m.e.d.-3 certification of comp.).

[@skunkjobb]

@@kenlee-97 I seems you didn't account for the fact that there are two counter rotating propellers on the same shaft. If you have twin shafts, single prop per shaft and have both in forward or both in reverse, you won't experience any noticeable prop walk since the transverse thrust from one propeller is cancelled by the other. I've never driven a duoprop so it would be interesting to know but my guess is that they give very little, close to no prop walk.

[@JeffMerrillYachts]

Jeff Merrill • 4 years ago Good question! I guess they will mostly counteract each other for minimal effect unless one is rotating more forcefully. Do you have a specific example?

[@MrMikewr]

Prop walk is commonly known as transverse thrust

[@JeffMerrillYachts]

Hello MrMikewr - that is a good term, haven't heard that description before, thank you!

[@kenlee-97]

Also people, not trying to complicate things even further, but in regards to the the trailing edge of the propeller being cupped, THAT IS ONLY APPLICABLE ON MOST OUTBOARD ENGINE PROPELLERS, this cupping doesn't really exist of propellers on anything other than props made for a planing/semi-planing hulled vessel.