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Old Feb 02, 2009, 04:27 PM
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Maybe its there to help balance the plane

I'm taking more weight out of mine to see if it improves the glide ratio. Will be interesting to see, if the rain p*sses off
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Old Feb 03, 2009, 02:56 AM
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Nup, I got nothing!.....
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I took the ASW28 out this morning and did a whole bunch of power off test glides, slowly removing bits of clay. I ended up taking all the clay weight out and put it up this morning with the battery as far forwards as I could. The power off glide is much longer and it doesn't drop the nose quite as severely. Sadly, it was just after a rain squall and pretty cool around this way so I didn't find any thermals.

I did put all the clay back in again and put it up to see the difference. It did seem to fly slower before stalling without the clay. I tried putting the elevator more neutral but ended up taking only one click out.
Old Feb 03, 2009, 04:38 AM
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Just remember you can go too far removing weight. This is a light plane and will generally be flying in light conditions. Here's what David Hobby (cool surname) world champion thermal RC glider pilots says about CG on light gliders.

David Hobby On Center of Gravity (2 min 24 sec)
Old Feb 03, 2009, 04:43 AM
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Crikey never leave beer behind
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this is where he woke up to the fact that its the wing doing the work.and by making it move forward it generated lift no brainer
SteveW
Old Feb 03, 2009, 05:09 AM
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Jeez. THat guy needs to start removing some of his own weight.
Old Feb 03, 2009, 05:31 AM
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Quote:
Originally Posted by me_wantee
Jeez. THat guy needs to start removing some of his own weight.

Ah ha ha. Good one!

I was trying to follow the advice given to me in the sailplanes forum.

Someone pointed me to this link:

www.slnt.org/articles/gordys_articles/1 Gordy's Ballancing System.PDF

I felt it flew fine with the extra 10g in the nose when it was over 10knots, but now I don't know if it's needed when the wind is light. I'd be interested to get your view Mr K if you remove the weight too...
Old Feb 04, 2009, 06:23 AM
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3 Strykers,your out !
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Maiden ASW 28


Finally got to fly the ASW tonight, yipee !!
Started with the 1300 lipo, (95 grams) that came with the glider, positioned as far foward as possible or as in my previous posts(#102) photo.
Flew OK , a slight breeze but with power off she nose dived noticeable, had to click a bucket load of up trim to get a hands off horizontal glide happening.
Landed and moved the pack back as far as possible allowing for servo arm movement ( see photo this post) .
Flew better or climbed better than first flight but still had a slight nose dive tendency when powered off. Breeze had increased slightly by now but was occasionally dropping to zero .
The way the glider is set up now seemed to fly superbly with no wind .
Quite a hot day here today and i could see evidence of thermal lift on the glider at times as well .
Pretty happy with the flight characteristics i must say .

Positives: Behaved well or was at least manageable at all CG positions
Performed some aerobatics, loops, inverted flight with no dramas
Couple of quite aggressive dives with minimal wing distortion.


Negatives:
Seemed a tad underpowered need to maintain shallow climbouts
to minimize tip stalling . More wind will help here, but i wouldn't
want to get blown down wind in a stiff breeze .
Things landed pretty warm bordering on hot (Batt, ESC) motor
ok. May need ventilation ducts ??
Wings became a bit loose and rattly after a couple of landings.


All in all I Really enjoyed flying this Glider and would certainly
recommend it to anybody thinking of getting one ...

Cheers JIM
Old Feb 04, 2009, 07:10 AM
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Took mine out at lunchtime today in a park near work. Once again I hooked a great thermal and really specced it out. Also I was flying from a cricket field with a proper grass square and pitch in the middle. There was lift coming from that and at one time I was about 25 metres up just circling the square for about 2 minutes not losing or gaining height. The guy that was with me was pretty impressed. I was actually wishing I had a DLG at that stage but the ASW was still great. Again 5 minutes total motor run time gave me 30 minutes flying time.

Be careful of those agressive dives. I did one on the weekend which saw the wings go into massive flutter and the canopy pop off about 100 ft up Luckily I was pretty much right over the field and had other flyers watching so someone could keep an eye on it coming back down.
Old Feb 04, 2009, 08:11 AM
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3 Strykers,your out !
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Asw


Be careful of those agressive dives. I did one on the weekend which saw the

Yep, the original guy i saw flying the ASW did the same he lost sight of the glider in the Sun and cause it was nose heavy by the time he regained visual the thing was in a nose dive 100 ft off the deck, wacked on the up stick way to aggressively and man I don't know how the wings survived they fluttered and buzzed something shocking .
I had mine pretty fast today but I learnt flying the Discuss to breath on the elevator pulling out of dives as the wings flex so much you got to limit the negative g !!! It's scary otherwise .......
I can imagine this glider would thermal on the slightest bubble of lift, it's so light
sounds like you've already tried it out ......... COOL
Last edited by junglegym; Feb 04, 2009 at 08:16 AM.
Old Feb 04, 2009, 01:49 PM
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Yeah the Discus taught me some of that too. Watch the wings in the first loop on this vid. Very scary.

Discus and Salto Coordinated at Otford 9/1/2009 (5 min 11 sec)


With the ASW the flutter was purely a speed thing being exceeded. I was nose down and holding it to see what it would do. Now I know.
Old Feb 04, 2009, 01:53 PM
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You lucky Australian gits !

It's cold an rainy and icy and plain miserable over here .... ..

If you write about catching termals one more time I'll throw myself out of the window ( I live in a bungalow )
Old Feb 04, 2009, 04:55 PM
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Nup, I got nothing!.....
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JungleGym,

Your battery is much bigger then mine! I took all the weight from the plane, but my battery is as far forwards as I could get it.

My wings are loose too. I put two toothpicks through the fuse to help secure the wings. I also noticed the ESC gets very hot. My canopy is slowly working it's way loose so I guess there might be some more air circulating then initially.

Clovus
Old Feb 04, 2009, 06:29 PM
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Quote:
Originally Posted by Mr Kamikaze
1. Yes standard 1000mah 2s battery. I was surprised to see it is only rated at 10c.

2. CG is 43mm from leading edge at fuse. Yes this was very good CG.

For those doing a first maiden flight,
note the above, for a good starting point CG:

"2. CG is 43mm from leading edge at fuse. Yes this was very good CG."

That was with the lighter 1000 mah battery.

If you use the heavier 1300 mah battery, and "if that is" the best cg, you still want the balance point at about 43 mm from the front edge.

Move the 1300 mah battery up and back, what ever it takes, until the cg balances at 43 mm from the front edge.

Give it a flight try, then re-adjust and fine tune, if/as needed.


***

Experienced ST ASW28 flyers,
update us.

... Is 43 mm from the front edge, still the best starting point cg, to maiden the plane, ... for both the 1000 and 1300 mah battery versions?
Last edited by Mr_Cash; Feb 04, 2009 at 11:05 PM.
Old Feb 04, 2009, 07:21 PM
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Quote:
Originally Posted by guy5927
If you write about catching termals one more time I'll throw myself out of the window ( I live in a bungalow )
I hear you. I jumped out of a window at work two days ago but a damn thermal just pushed me straight back up and in.
Old Feb 04, 2009, 08:18 PM
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funny I jumped out of a thermal only to be in a bigger one go figure ? so you bring you ASW and Discus to Manilla for a long weekend Mr K ??
SteveW


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