# Sardone v1 Jet build with testbed - Poor Max static thrust 12Kg - Would you help?

**URL:** https://foil.zone/t/sardone-v1-jet-build-with-testbed-poor-max-static-thrust-12kg-would-you-help/4151
**Category:** Builds
**Created:** [April 2, 2019, 11:19pm UTC](https://foil.zone/t/sardone-v1-jet-build-with-testbed-poor-max-static-thrust-12kg-would-you-help/4151 "2019-04-02T23:19:28Z")
**Posts on this page:** 1
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### Author: ![Giga](https://foil.zone/letter_avatar_proxy/v4/letter/g/b9bd4f/32.png) [@Giga](https://foil.zone/u/Giga)
#### Post date: [April 2, 2019, 11:54pm UTC](https://foil.zone/t/sardone-v1-jet-build-with-testbed-poor-max-static-thrust-12kg-would-you-help/4151/2 "2019-04-02T23:54:34Z")

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Are you sure that your calculations are right?  
Over the thumb I would say your thrust is a bit less than twice the scale reading + ca. the weight of the rocket (I didnt run the numbers, but your string splits the force to 2 fixations of the string (like a pulley) and your scale measures only one side, but I has to be less than x2 since your string is not vertical and so you got a horizontal part inside your scale readings (should be about x sin(angle of string)).

So you would actually be closer to 20-25kg thrust…

And you might have gotten @Mat wrong 😉

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