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Retro-Fi MkII - Long Range Taildragger style SSTO
This is a Liquid fuel only, long(ish) range variant of the Retro-Fi. It can reach a 100km Mun orbit and return home.
- MechJeb 2
- Squad (stock)
- Type: SPH
- Class: spaceplane
- Part Count: 47
- Mods: 2
Take off and Ascent
Select control from here on the rear cockpit (this is v important)
SAS on, stage and hit  to disable the LV-N engines, throttle up and about half way down the runway hit  to extend flaps.
Once airbourne raise the flaps  and set pitch to 10 degrees. (recommend using mechjeb SmartASS to control pitch). Stay at a pitch of 10 until you reach a surface speed of 1000-1100m/s and then pitch up to 30 degrees. Pitch up smoothly but fairly quickly, use the incremental control on the SmartASS and increase by about 3 degrees per second.
As you start to lose acceleration (at around 19km) fire up the LV-N’s , remain at a pitch of 30. As you climb your vertical acceleration will drop (and may even dip below 0 for a bit). Just keep at this pitch and keep going. As vertical acceleration starts to increase again start gradually lowering the pitch. You’ll end up with a very wide ascent orbit by the time the Ap reaches 100km (and Pe will probably be at ~20km, so will only require a very short burn to circularize. While coasting to the AP, transfer all the fuel out of the side tanks into the central tanks (don’t add fuel lines!! fuel lines cause a lot of drag and will reduce the available dV once in orbit by about 3-400m/s!)
You should be able to reach 100km LKO with between 1700-1800m/s dV spare.
Open the service bay  once in orbit (it contains it’s solar panels.
Transfer to Mun
With 1700m/s dV you will have enough to transfer to Mun and park in a 100km orbit and should have about 600m/s spare for the trip home.
Return from Mun
When transfering back from Mun, aim for a Pe of 42km and reenter with a pitch of 80. That should bring your orbit down to about 400km with enough fuel left to make adjustments to target your landing site.
With the LV-N engines it’s very rear heavy and needs to touch down as gently as possible. tap brakes before coming into land to extend flaps for a bit more lift.
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