Grob 104 Speed Astir

I recently purchased a Speed Astir IIB and I'm in the process of getting it sorted for the next flying season. I'm interested in getting information from current and previous 104 owners regarding their tips, hints, and suggestions on flying the 104 as well as maintaining it and possible upgrades.

I'm currently replacing the pitot static lines and the wiring. I hate mice! The ship is equipped with an Edo Aire 551A which seems to be quite power hungry. There appears to be a voltage drop when transmitting as the Cambridge MKIV vario is affected every time the PTT is pressed. I'm reworking the wiring to get rid of any voltage drops including larger gauge wire and fuses versus the currently installed breakers. I will also reroute the wiring to try and limit any interference issues. I'm also considering making up a 14V battery as well if the problem persists after redoing the wiring.

Once these issues and the interior are replaced I will start to refinish the gel coat. When I bought the glider the control seals (other than the elasti-flap)were in really bad shape. The rudder seal was missing although I could see adhesive residue on the right side and there was a deteriorated fabric seal on the top of the stab and elevator gap. There were no turbulator strips either on top or bottom of the wing. In doing research I've seen the Eppler 662 will see some improvements with turbulators and have the info on placement from one of Udo's threads. Does anyone know what type and size of strips are best for this application? Also are other 104 owners using mylar seals on the rudder and elevator and if so what size seems to work best? Any internal seals?


I'd like to thank Guy "DDS" and "Skimmer" for there insights and help along the way so far.