Gliders with FES
WHICH NEW SAILPLANES CAN BE ORDERED WITH FES?
DG Aviation, Germany – high performance sailplanes
SAirKo, Lithuania – high performance sailplanes
- LAK17B FES, latest generation of FAI 18m class sustainer sailplane, with MTOW 600 kg. EASA certified (2014).
- MiniLAK FES, new generation of self-launching FAI 13,5m class sailplane. EASA certified (2020).
- LAK17C FES, latest generation of FAI 18m class self-launching sailplane, not EASA certified yet.
HPH Sailplanes, Czech Republic – high performance sailplanes
- HpH Shark eS, FAI 18m class sailplane, with strong safety cockpit and many other features. EASA certified (2016).
Avionic, Poland – producer of famous Diana 2 FES
Alisport Swiss, Switzerland – producer of UL self-launching sailplanes
- Silent 2 Electro FES, FAI 13,5m class sailplane (Annex I), certified by DAeC!
Albastar, Slovenia – producer of UL self-launching sailplanes
- AS13,5m FES and AS15m FES, FAI 13,5m class sailplane, and 15m recreational sailplane.
In principle, LZ design can not offer FES retrofit for used sailplanes. Unfortunately, EASA does not approve an “Experimental registration”, like it is arranged in USA.
Exceptions are possible only for sailplanes that are Annex II types – these are by definitiony not EASA aircrafts and are therefore handled under national rules.
FES can be installed to used sailplanes in some special cases, where type certificate holders of specific glider type are involved. These are, for example:
- DG Flugzeugbau offers FES retrofit of some serial numbers of LS8 as published on this link.
- Schempp-Hirth offers FES retrofit of used Ventus 2cxa
For more information about FES retrofit please contact DG Flugzeugbau or Schempp-Hirth.
Most of the sailplanes which were designed to fly with some kind of engine, can be also FES equipped!
- MAXIMUM WEIGHT
The most important is the maximum weight of the non lifting parts (everything including pilot, except the wings). There must be enough reserve for additional 45kg of weight in the fuselage. If this requirement is not met, than it is not possible to install FES – due to safety reasons.
- NOSE SECTION
Nose section should be as round as possible, slightly elliptic or eggy shape is also acceptable. We usually design a special spinner or adjust the front part of fuselage to be appropriate for FES installation.
EASA REGULATION (European countries)
Airworthiness and certification can be done in different ways, depending on the “type” of sailplane:
- EASA used sailplane,
- EASA new sailplane,
- Annex II type sailplane (non EASA type of sailplane).
Certified EASA sailplanes require valid Certificate of Airworthiness (CoA).
If the sailplane is modified, CoA is not valid anymore.The following options are possible to make the saiplane airworthy again:
- Initially EASA Permit to fly (PtF) can be arranged based on EASA Approval of flight conditions. One of the conditions EASA requires to issue an Approval of flight conditions is that the application for certification project is applied to EASA by DOA or ADOA organization.
LZ design does not yet hold a DOA or ADOA certificate, so we cooperate with other companies, and sailplane manufacturers which are usually certified as ADOA.
ULTRA LIGHT, EXPERIMENTAL, HOME-BUILT SAILPLANES
The main factors influencing the total cost of FES installation, are:
- single / double seater sailplane,
- used as a pure sailplane / used, but prepared for FES installation in advance,
- possible specific features of each sailplane type,
- possible special local regulations and conditions,
- required type of certification: EASA, Annex II type etc.
The manufacturers of the new aircrafts with built-in FES system, determine the final price of FES system themselves!