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Old Mar 18, 2013, 05:50 PM
Less Whinning, More Flying
Sailhigh's Avatar
SF Bay Area, USA
Joined Feb 2003
1,653 Posts
Congrats on the maiden flight. That's quite an accomplishment!

Sean
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Old Mar 19, 2013, 01:57 PM
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tuootal's Avatar
Earth-Europe-Finland-Espoo-Friisilä
Joined Sep 2007
651 Posts
brief analysis of flights

Thanks Sean & SmallC

Okay, then to analysis of flights. I think that nobody at field thought that it would fly so well. So it was easy to exceed any expectations. Some thoughts:

- It really flies nicely.
- Ailerons are quite lame. They are not effective enough to even cause rolls.
- Stall is totally flat, soft & predictable
- Elevator is nice, not twitchy at all
- Turns are flat, but this requires co-ordinated use of ail, rud & elev. Not yet visible at maiden tow
- Glide path is smooth and comparable to any glider, even larger ones
- with auw of approx 5.000g load is 38.1g/dm2 which is quite modest

This is an mystery. Every prediction was totally wrong. Our conclusion was that this plane is like bumblebee of that old story. According scientists it cannot fly. Luckily it does not know it.

Seriously - we had long discussions regarding a) thick elev. profile making elev. difficult to stall (= softer), b) ailerons are quite narrow part of wing, so they are not so effective, more like airbrakes, c) in general this is a bit like Pou du Ciel. That is, almost an flying wing. Not requiring so much dihedral.

I am not an expert in aerodynamics. This is an puzzle. Any thoughts?

Oh yes, another maiden video
1/3 Gluhareff S-22 maiden flight, Padasjoki 16.3.2013 (HD) (2 min 38 sec)


Tuomas
ps : if you watch maiden video closely you will notice that elev is occasionally slightly off. It seems that I managed to bang it to car door while loading it to car. There is considerable slop in hinge. Not affecting flying, just cosmetical. Have to find an way to fix it.
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