# Plotting the speed/thrust function for small model boat propellers -70mm dia max

**URL:** <https://boards.straightdope.com/t/plotting-the-speed-thrust-function-for-small-model-boat-propellers-70mm-dia-max/954713>\
**Category:** Factual Questions\
**Created:** [November 21, 2021, 11:33am UTC](https://boards.straightdope.com/t/plotting-the-speed-thrust-function-for-small-model-boat-propellers-70mm-dia-max/954713 "2021-11-21T11:33:44Z")\
**Posts on this page:** 3\
**Page:** 2

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**Author:** ![Crane](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/crane/32/3495_2.png) [@Crane](https://boards.straightdope.com/u/Crane)\
**Post date:** [November 24, 2021, 2:53pm UTC](https://boards.straightdope.com/t/plotting-the-speed-thrust-function-for-small-model-boat-propellers-70mm-dia-max/954713/21 "2021-11-24T14:53:30Z")

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Arrrrgh…I’m getting messages that my emails were not delivered!

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**Author:** ![Crane](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/crane/32/3495_2.png) [@Crane](https://boards.straightdope.com/u/Crane)\
**Post date:** [November 24, 2021, 3:18pm UTC](https://boards.straightdope.com/t/plotting-the-speed-thrust-function-for-small-model-boat-propellers-70mm-dia-max/954713/22 "2021-11-24T15:18:34Z")

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Mail was removing the au from the email address. I believe I fixed it and resent the emails. I’ll also try another Private Message

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**Author:** ![Crane](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/crane/32/3495_2.png) [@Crane](https://boards.straightdope.com/u/Crane)\
**Post date:** [November 25, 2021, 4:34pm UTC](https://boards.straightdope.com/t/plotting-the-speed-thrust-function-for-small-model-boat-propellers-70mm-dia-max/954713/23 "2021-11-25T16:34:02Z")

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Stuart - [HERE](https://r.search.yahoo.com/_ylt=A0geK.RouJ9h6cwAlT5XNyoA;_ylu=Y29sbwNiZjEEcG9zAzIEdnRpZAMEc2VjA3Ny/RV=2/RE=1637886184/RO=10/RU=https%3a%2f%2fm-selig.ae.illinois.edu%2fprops%2fvolume-2%2fpropDB-volume-2.html/RK=2/RS=EVRfxznfAxGmiehgFAZhJvAzTIY-) is a link to the U of I propeller data. They have measured data for Cp and Ct under both static and dynamic conditions.

At low R numbers and low RPM you can extrapolate from static data even though J=0

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