Calculate Required RPM

[@stepheneurosailor1623]

Very helpful.

[@deckprep]

Glad it was helpful!

[@bernardjaymonosco]

#2 problem. 69.2 rpm is the answer?

[@tapan4253]

how you know that conversion factor how to findout and this factor is same for all vessels or small craft will have different one??? please let me know

[@deckprep]

Hi. The formula used in this video is valid for all vessels regardless if size as long as you know the propellor pitch,.RPM and an estimate of the slip

[@andrey8534]

The other question is 52 rev/min am i right ?

[@deckprep]

@And Rey Which other question? Do you mean #2? With Pitch = 26.2 and SOA is 18.6? The answer to that one should be 69.2 RPM. 18.6 x 6080 / (26.2 x 60 x 1.04) = 69.2

[@conradopalmiano5868]

Sir thank you so much for your Sharing of your knowledge . But the answer indicate in My Sci cal is. 61.28 or (61.3RPM) Sir please correct me if I'm wrong. you avid listener sir.

[@deckprep]

Hi. Thanks for watching. I just did the calculation again and got 64.1 again. I'm not sure what you are doing differently. Are you using all of the same numbers as I am in all of the same places of the formula?

[@eebramocgnay8501]

@@deckprep good day sir, thank you for posting this. i use this in my sci-cal (15*6080)/(23.4*60*1.06) and got 61.28. did we do something wrong? can you please show us what you did in your sci-cal? thanks again

[@gianarnielbugzcastillo5931]

@@eebramocgnay8501 compute that to (15.7*6080)

[@xborg6333]

Very nice explanation..hard to understand

[@deckprep]

You're welcome

[@DnoMa1]

The answer is 61.2

[@deckprep]

@Nat Nat - I checked the problem and got an answer of 64.1 again. Please check your work

[@iloilohalabira3099]

He wrote 15 instead of 15.7 You will get 64.1 if you correct the SOA