Why the URL slow-flyer.com? Well, I made my first aerobatics experiences with indoor models. That was at a time long before lipo batteries and brushless outrunners. Everything was really experimental and so I collected a lot of stuff here at this website. Things developed fast and all the information got outdated since quite a while. That's why I decided to launch a all-new version of my website, related to what I actual do: Aerobatics with planes up to 40% scale, 3D flying and F3M (the european IMAC) competitions. I kept the URL slow-flyer.com because it is well-known and wide-spreaded.
I was looking for a robust electric every-day-plane to do some flight training after work. The plane should have flight characteristics which come as close as possible to those of a 3m giant. I still had one of the good old Hacker C50-13XL Acro drives, still the first version with a spur-toothed gear. The sound might be a bit strange for some people, but the enormous power of this engine is legendary. I already had it in one of the first electric Weihershäuser-Funtanas, back in times with 30 NiMH-cells and it still runs great.
I really had doubts if that combination, which was originally made for F3A-planes with 5 kg, would be enough for that huge fuselage of the 2.1m Yak, which is often far above 7 kg with a 50cc engine. Keeping everything really slim (only 1 elevator servos, small PowerBox DigiSwitch with 900 mAh Lipo and Carbon canopy), I could finally reach a fantastic weight of only 6.2 kg RTF.
The project was a full success: The power is amazing with flight times of about 8 minutes. The plane is exactly the trusty allrounder I was looking for and behaves much better than a lot of chinese wooden planes, in particular in rough weather conditions. But also the 3D capabilities are great and the plane is much much better than some guys write in some forums.
Details:
Yak 55SP 2.1m CARF-Models
Hacker C50-13XL Acro 6.7:1
Hacker Master 99-O-Acro
Metts 21x10" wood prop
10s1p SLS 5000 mAh drive battery
4 x Graupner DES-707BB servos
Spektrum AR-7000 receiver
PowerBox DigiSwitch on 2s 900 mAh Lipo
Weight ready to fly: 6.2 kg
A video of one of the first flights can be watched here (E-Meetingen Dietlingen 2011): Video Yak 55SP 2.1m
Take care, Sascha
HORIZON AIRMEET - 08-23-2010
Here some pictures from the fantastic event.
Have fun, Sascha
CARF SU 31 MAIDENED - 06-18-2010
The last time was a bit crazy. I really had to hurry to get the big SU in the air early to have sufficient practise time left for the competitions and airshows this summer. So nothing besides working, building, sleeping. I'm finally done now!
Yesterday, the SU got in the air the first time. Everything went well. Wow, what a plane! Unbelievable slow and floaty. Almost like a Shock Flyer! Agility in 3D is great. The ailerons are really effective, even with moderate throws. Concerning the roll rate, my fingers will be the limit, not the airframe...
The DA 170 on Greve pipes is pulling hard with the Mejzlik 30x13 Evo. So this seems to be a great combination. Because of the Emcotec TSC regulator, I have a linear midrange. A detailed report of this new electronic accessory is in work and will be published - as always - in the "Modell" magazine. Besides that, I put the well-proven equipment from my Yak in the SU: 8711 on ailerons, 8611a on rudder and elevator, PowerBox Champion with 2800mAh Lipos and Spektrum AR 9000 receiver.
A small amount of knife edge coupling is needed, but it's done with only about 5%. Can't say that much about the sequence capabilities yet, because the plane was much too tailheavy. I have to move the rc/battery/tank plate forward, as well as the engine. Will keep you updated.
I'm highly motivated for this flying season and am already looking forward to start practising with the SU-31. Only need one thing: BETTER WEATHER!
