Hi Senna,

not sure how good your German is, but I wrote a test about the LS1-f: https://www.segelflug.de/tests/LS1/index.html. Google translate might help, too.

If you have the chance, fly an LS4. The LS1-f is very similar - it has a bit higher control forces and an even better feel of the thermals.

As any glider of its vintage, an LS1-f has its flaws. Besides the usual items (gelcoat, cracks, paperwork). You should check the following items in particular:
- transition between vertical tail and fuselage boom: the bulkheads are a bit weak and tend to break or get loose. This is a quite common problem with the F. Check for cracks in the gelcoat. When rigged, twist the fuselage boom by slightly pushing the top of the vertical tail to the side. If it has a "soft" feel, there might be an issue. Preferrably take an LS1-f that has been repaired in this area. Unfortunately, the repair requires quite some work to do.
- if it sits low on the ground, the springs of the gear are worn and need to be replaced. This is an unexpensive fix (~120€ for the parts + 1 day of work)
- some F have the undercarriage modified to LS4 standard, containing a gas spring in the pushrod. This may wear, causing the gear to collapse. If you can, take someone who knows LS4 from your club. She or he should take a closer look at the whole gear assembly.
- as with many other gliders, the lift pins tend to wear over the years. During 3000h livetime extension, they often have to be replaced. Repair needs to be done in a professional workshop.
- check the play of the lift pins and how many washers are used to reduce it. It is okay to use up to 0.5mm of washers in total on all lift pins.
- check the canopy lifting mechanism for excessive play. Repairs may need some welding.
- levers of the main wing pins should be fastened. They are kept in place through rivets or screws which may loosen over time. It's an easy thing to repair.
- the forward attachment point of the horizontal stabilizer is done with a rod end. This has to be glued in place
- check how old the l'Hotellier connectors are. In EASA-land, they have to be replaced after max. 3000h (which actually is not a bad thing to do). A complete set of connectors is about 1600€

Best regards,
Christoph