Noob question.... I understand that rockets use fuel and oxidizer and that the fuel containers for them already have the right balance by default.
I'm doing a mission for atmosphere scanning above 19Km and know that jet engines only work so far and then I need rockets to help with the height.
I keep the rocket engine off until I need it however by that time, some fuel has gone down in the rocket fuel portion just from flying - and the oxidizer runs out really quick relative to the fuel.
https://steamuserimages-a.akamaihd.net/ugc/839209486473125943/9B964AA8182EB283633197D31EECE96EF4EAD851/
Can anyone point me in the right direction on why oxidizer is going down so fast?