Gluhareff S-22 - Tuomas

[Frédéric]

Salut Tuomas !




Amicalement
Frédéric

[tuootal]

Merci Frédéric!

brief update - Peekoo just published an short video of S-22-maiden. We are still in process of finetuning it, but it can be seen currently http://youtu.be/A0q__2AxVZY

Tuomas

[patte de loup]

congratulation for this maiden flight

pat'

[Anonyme]

Oh, the tug is a bit violent ! but nice flight and nice landscape..

[tuootal]

Merci Pat!

Yes, that tug is quite brutal. We were quite worried that there would be something... bad during maiden tow so we decided to perform helicopter tow. That is, go straight up. In case of problems during tow they are easier to solve if you have height.

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 : http://youtu.be/DF58vUN1YCQ

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.

[Anonyme]

OK, sure to get height with such an helicopter tow but you may have some problem to release hook with the tension if something gets wrong...well, good ending and congratulations once more !

[cpdude]

Tuomas,

She looks wonderful! Regardless of the lame ailerons. But how is it actually turning? With no dihedral (v-form) the rudder should just cause a skid. Do the ailerons cause any change in direction?

Regards,
Brian

[tuootal]

It does skid, which is evident on video. But with rather modest co-ordinated use rud & ail you can make totally flat thermal turns. I even managed to stay in thermals for good while. The sun was heating dark forest, so there were some small thermals, despite freezing temp. One thing which I noticed was that this plane does need also some elev also while making quick turns.

I tried to compensate lack of dihedral with putting all heavy things to bottom of fuselage. This is quite deep fus, so it puts center of gravity to low. Creating similar effect as dihedral.

Ailerons do create some change of direction, but it is really modest. Luckily weather was quite calm (1-2m/s) so there were no need to adjust glide in gusts. I have to adjust travel to get more control.

I forgot to add that I managed to make loops. Which is most certainly the first time this plane has looped.

Tuomas

[tuootal]

Gentlemen,

I just noticed third video containing S-22-flying. That part of video was taken at end of event with crowds going home. So field is almost empty and no paragliders.

http://youtu.be/RDcosOWb03I

There is an hair-raising incident starting at approx 3:30. Bidule-towplane (btw - it is French ) landed to strip and then I also landed. As S-22 has limited braking capability I overshot space and ... well, see the video. Luckily S-22 had momentum. Actually, it really does glide rather well.

I really should learn flying. This is quite embarrassing.

Thanks for Henkka for video!

Tuomas

[tuootal]

Hello everyone,

I got back from winter skiing holiday and check'd camera. There was still couple photos which I forgot to add to this thread. See below..



Gluing rudder to fuselage. Again.. it's those Ikea-shelves in good use. Actually, they are not good to be used as shelves, only for aligning model aeroplane parts :)


Balancing act. I have balanced larger planes in my shop but it seems to be getting smaller.


As an final touch I added an dashboard with one instrument. I had ordered an cheap altimeter for some experiments from ebay and it had nice small instruments in it's strap. Good use for that abysmall thermometer. The size looks quite scale.

pls. note that this is not final pic of dashboard. I should go to my shop and get final picture of it installed etc. BUT but but ... it is snowing again and I simply do want to go outside just now. Propably tomorrow.

Tuomas

[tuootal]

One more thing.

I finalized & published plans of this plane. They are available for free download at http://www.iwaru.fi/gluhareff.html

Tuomas

[Papy Solex]

Hi Tuomas,

Congratulation for that maiden flight...remember, i trusted in your glider...
As Vincent said, that's a really neat construction.... and fast too !!!

So, total respect for what you do...

Jean-Paul "Papy Solex"

[tuootal]

Greetings!

I have been neglecting this great site for too long and small update is in place. First, S-22 is still flying great. No problems there. That is fun little plane.

But, this is news. My friend from Kuopio (city in middle Finland) commented in last aerotow event that ‘You, Tuomas have this interest in old planes, I have found an old book in my old relatives cupboard which might be of interest’… It turned out that his relative was some sort of inventor and he had an authentic book from 1924 with name ‘Moottorittomat Lentokoneet ja heikkomoottorilentokoneet’ by B. Adaridi, 66 pages. This is extremely rare book in which mr. Boris Adaridi explains flying with ‘Motorless aeroplanes and Avionettes’. AND it has the same plan of every mans glider as in Suomen Kuvalehti 1924 i featured in my S-22-plan page, http://iwaru.fi/gluhareff.html

This book is really great reading. Especially if you are native finnish speaker. But, I made an short compilation of findings on by blog site, check http://www.modeldesigns.iwaru.fi (or direct link to article http://www.modeldesigns.iwaru.fi/gluhareff-s-22-adaridi-sk24-update/).

I made high quality scans of that SK-24, they can be downloaded from the blog article or using direct address http://www.modeldesigns.iwaru.fi/wp-content/uploads/2015/08/SK24-pages-1-3-02-bw.zip

Just to keep you amused here are low resolution versions of SK-24 plans.

Also, my blog site contains quite a bit pictures of local Aerotow events and some of my later designs.

Tuomas

[VincentB]

Thanks Tuomas for these documents, and for the link of your blog

[RichardP]

Vincent, je viens de découvrir ce post suite à ton dernier message concernant le Lippish - Falke, ce planeur est vraiment original et splendide, a-t-il volé ?
J'imagine qu'il y a beaucoup d'autres petites merveilles dans rétroplane

[VincentB]

Oui, regarde plus haut, Tuomas a posté un lien de vidéo

[fabrice92]

Bonjour

Si tu veux suivre la construction de ce planeur(en fait il y en a 2 en construction....) , j'ai ouvert un nouveau post sur le forum.

http://www.retroplane.net/forum/viewtopic.php?p=144357#144357

Fabrice