[Kerbin Circumnavigation Challenge - Reloaded [New Rules Once More]]

Here is my Folker Tri-plane entry. I have KER installed, but thought that was allowed when I first read about this challenge. I will go back and repeat this challenge without it if that is required.

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[The K Prize - 100% reusable spaceplane to orbit and back]

Here is my first attempt at a challenge entry. Hopefully I get the formatting correct for the album to show up.

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This design is obviously my imitation of an X-Wing in stock KSP. This can easily get into orbit and deliver a satellite to LKO.

[10 year launch window calendar]

Should work, but note that the dates are in *earth days* because this chart was made before Kerbin days were in the game.

Does this means it is calculating 1 day as 24 hours? So if it said year 1 day 2 it would actually mean Kerbin day 5? If that is the case, how were years calculated?

[minimum/optimum lift in stock]

thanks so much, that helps explain some of my issues then. My latest behemoth was at max pitch just to maintain altitude at ~21km and seemed stuck at < 1300m/s. Now I know why.

Mass: 65t

Lift: 93

6 turbojets with 1.25 ram intakes each and 300 liquid fuel for each turbojet.

Time to redesign this with less lift and cut some mass too. Thanks again for the answers.

[minimum/optimum lift in stock]

Is there any way to determine what the minimum and optimum amount of lift is for a give spaceplane mass in stock? Currently, when I try and design a new plane and take it for a test flight, I have no idea if the poor performance is due to insufficient lift, too much lift/drag, or not enough thrust/power (moar boosters!). I am sure this all depends on each individual craft design, but is there any general rule of thumb people use?

Edit: changed to answered. Thanks to all who responded.