# Spirit pack scale

**URL:** <https://forum.gbfans.com/t/spirit-pack-scale/16012>\
**Category:** Proton Packs\
**Created:** [June 27, 2020, 2:35am UTC](https://forum.gbfans.com/t/spirit-pack-scale/16012 "2020-06-27T02:35:43Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![greenbastard](https://forum.gbfans.com/letter_avatar_proxy/v4/letter/g/3e96dc/32.png) [@greenbastard](https://forum.gbfans.com/u/greenbastard)\
**Post date:** [June 27, 2020, 2:35am UTC](https://forum.gbfans.com/t/spirit-pack-scale/16012/1 "2020-06-27T02:35:43Z")

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Been spending some time rebuilding the Spirit pack to give it some more accurate features. I measured the pack extensively and cross referenced it with Stephan’s plans. The scale of individual parts (gear box, [cyclotron](https://www.gbfans.com/wiki/equipment/proton-pack/cyclotron), [power cell](https://www.gbfans.com/wiki/equipment/proton-pack/power-cell), [booster tube](https://www.gbfans.com/wiki/equipment/proton-pack/booster-tube), etc) from my calculations turned out to be an average 85% of the original dimensions.

Keep in mind that is measuring each part’s dimensions that show a common scale factor by adding them up and dividing them.

Curious why 80% is considered the de facto scale?