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Author Topic: Sweepette 36D -Build-  (Read 21380 times)
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Rewinged
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« Reply #175 on: May 24, 2011, 09:22:09 PM »

BG,

You can try different launch angles as well as playing with glider trim.  Also, different release timing will affect the bank at launch, which also affects climb and recovery.  I have only played with this enough to get my different gliders to recover well, not to optimize height.  I don't get enough flying time to try enough variations and keep them straight in my head.  I should probably keep a log.

Anyway, try different launch angles--you'll likely find an angle that will work with existing trim.  I launch a couple of my gliders quite flat--maybe 20 degrees up--and another up about 45 degrees.  A steeper launch angle will get you higher, but obviously not if you sacrifice too much recovery. 

--Bill
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« Reply #176 on: June 08, 2011, 10:43:13 PM »

Hi All,
got my bird fixed after the dog stepped on the wing and snapped it. The repair went fine and we were out doing some flying today. The air was good and the wind was down. I managed to put her into a few patches of lift and got one great 6 minute flight where she climbed up to ~300 feet and just floated around gently. The other good flights were all over 2 minutes. This bird is able to really milk light lift and is good for 60-70 seconds in dead air. I am still working on launch technique...I am trying to emulate what stan does but I will need to record this before I can evaluate it.

My launches seem ok and consistent but I would wish for more altitude. The recoveries are generally quite good with no stall or loss of altitude.

Now my arm huts though....gotta get in shape I guess

B
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« Reply #177 on: June 09, 2011, 12:19:23 AM »

Glad you got to let your bird out of its nest for some good flying!
Sorry about the arm pain...or is it shoulder? Strange, most never have arm trouble with TLG launching.
Unless possibly you are trying to more vertically pitch it, instead of more level.
I have heard of some such arm pain from those who tried that motion.
But you will find your way to TLG Nervana, I am confident!
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« Reply #178 on: June 09, 2011, 01:58:49 PM »

Hi All,
Lee I am trying to keep things horizontal-ish, but I am not always consistent and one particular throw left me in some pain (slight shoulder muscle pull I suspect. Also the tendons in my elbow hurt (though I generally succeed in keeping the arm straight I do hook a launch from time to time).

Practice practice practice is the answer..
B
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« Reply #179 on: September 23, 2011, 01:33:36 AM »

Production line for new TLG wings. Should have two new SWE 36DIIS in a week or two.

B
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Re: Sweepette 36D -Build-
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« Reply #180 on: September 23, 2011, 01:51:26 AM »

Query Bernie,
Will one of them have undercamber or not?
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« Reply #181 on: September 23, 2011, 09:17:26 AM »

Ahh...good query!

I have started putting undercamber on one (the lower wing blank in the photo is nearly finished). I was thinking to leave the other flat just to see if there is a disernable difference. I am guessing that you would be interested in this experiment too  Wink


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« Reply #182 on: September 27, 2011, 05:14:45 PM »

Update: both wings are nearing final sanding. Next step will be to add the dihedral etc.
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« Reply #183 on: September 28, 2011, 01:32:48 AM »

Update: So just realized that both my wing blanks are thick...the foils are 9.5mm at the center and taper to 8 at the hedral break. Do i plane em down to 7.5 now? or do I go with the thicker foils??

One advantage is that the weights (45g and 47g) would get down closer to 40g (which my earlier version had).

Also one of the wings is undercambered and the other is flat bottomed.

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« Reply #184 on: September 28, 2011, 02:38:21 AM »

If it were me...

I wouldn't go down to 7.5.  Maybe 8.5 or 8.  I'd be tempted to leave it like it is.  My best Mumbo Jumbo--which is hard to beat--was over 52 grams after shaping, and gluing the dihedral, but before adding the dihedral braces or any glass or finish.  The SW36D likely has a bit less area, since it tapers earlier, and my MJ is nearly 4 7/8 inches root chord.  But still, your weights are very good, at least to me.

The 9.5 mm root chord is a tad thick from what I know for TLGs, but still doesn't seem like a particularly thick airfoil at 8.2% or so.  (Assuming 4.5 inch root chord + LE hardwood)

Re-reading your post, I see that the panels are down to 8 mm at the dihedral break.  I think I'd leave the center panels alone.

How much undercamber did you put in?

--Bill
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« Reply #185 on: September 28, 2011, 02:44:03 AM »

Stop work until you answer this query: How much upsweep did you put in at LE?

If less than 1.5mm, increase to 1.5 or even 1.8mm.

Carry the greater upsweep value to the wing tip, or nearly as you can.

Then increase tip washout [sand or carve it] from tip d'dral line until you have about 2mm near the wing tips.

The weight will be less, but I see no worries if still over 45gms.

Good luck. Don't fret.

Bill has good thoughts as well.
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« Reply #186 on: September 28, 2011, 03:01:17 AM »

BG,

Looking back earlier on this thread, I was reminded that you had some launching issues and a bit of pain.  Though you're not a beginner, you might find my "TLG Beginner's Launch Guidance" a good refresher.  It has some stop-action sequences and video links as well as the text.  It's a few threads earlier in this forum at the present time.  Pretty basic stuff I'm sure you already know, but then again you shouldn't be having pain or trouble--and we want the new gliders to have a long soaring life!

--Bill
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« Reply #187 on: September 28, 2011, 12:07:41 PM »

Hi All,
Bill I think I mostly solved launch issues and pain...my launches have been decent and fairly pain free recently.

Wings:

undercambered is 9.5mm thick at root and 8.9 at hedral breaks. Upsweep is 1.8mm. undercamber ~.6mm. I don't have room to sand in washout so will have to warp it in or skew hedral breaks.

Flat bottom is 9.8 at root and 8.5 at breaks. Upsweep is 2mm. Also no room for sanded washout.

thoughts?
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« Reply #188 on: September 28, 2011, 12:52:46 PM »

As a longstanding rule of mine, washout is sanded into each tip first thing.
Say, the last 15-20% of each wing half.
The above is in addition to washout gained by skewing the d'dral joints.

I feel & have found the use of both methods gives a more progressive and repeatable washout.

That said, if all else fails, cut bottom of tips at an angle from tip point to near d'dral break, bend up
to desired washout amount and CA glue in place.  Then do your fiberglassing of the launch tip.
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« Reply #189 on: September 28, 2011, 12:59:29 PM »

Leeper has the experience, but I will say that Stan's plans don't show any sanded washout, just the skewed dihedral joints.  Hence, my TLGs don't have any sanded washout.

The sanded washout--with the consistent tip-to-tip upsweep Lee mentioned, is lower drag, and hence has shown better performance for CLGs.  I suspect the difference for TLGs is more modest, but there should still be a benefit.  As I see it, the problem with skewed joints is that the tip might end up at negative angle of attack at high speed, which is very high drag.  But like I said, my TLGs only have washout from skew.

--Bill
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« Reply #190 on: September 28, 2011, 06:12:49 PM »

Bill, etal,
You would only need to examine Stan, Ralph & my gliders to see the sanded in washout.

Some things that get done are not on plans.

Read between the lines here...
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« Reply #191 on: September 28, 2011, 06:23:35 PM »

Lee,

I believe in you, and in sanded washout.  My newer CLGs have it, and if / when I build another TLG, it will have it.

Just saying that my best TLG doesn't have it, since I knew even less when I built it than I do now, and it wasn't on the plan.  And as you know, my glider seems OK. Smiley  So if BG would prefer not to cut and glue, or sand some more, it can be OK.

Reading between the lines... (?)  one thing I am curious about is how much washout has been found to be optimal?  I just followed the plans for my TLGs, and guesstimate for my CLGs, and just asked Hannah re my P30.  There's always more to learn, so maybe you can share something about that.
 
--Bill
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« Reply #192 on: September 29, 2011, 01:35:06 AM »

Re "how much washout has been found to be optimal?"
The answer is: Whatever works.
That means it is a factor depending on many design and trimming parameters.
You can sometimes trim around the optimum to achieve fair results, but making incremental changes
from plane to plane and especially on the same plane will glean better understanding of the beast.

Is that too Zen for this subject matter?  Roll Eyes Huh Grin
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« Reply #193 on: September 29, 2011, 01:49:07 PM »

Hi All,
So i have warped in some washout on each tip. My technique is to use future floor polish at full strength. I soak the wood top and bottom at the tip and then weight the wing down over a washout wedge. I have gone for asymmetry (1mm more on the right than the left) because my birds go left.

Hope to cut and glass tonight.
B
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« Reply #194 on: October 06, 2011, 12:18:45 AM »

Hi All,
So Jugs 1 has a new set of wings...flat bottomed and 10g heavier than the old ones (thicker foil and heavier wood). New AUP is 90g (92 with sandpaper strip and some tip weight).

Here are some photos...
Attached files Thumbnail(s):
Re: Sweepette 36D -Build-
Re: Sweepette 36D -Build-
Re: Sweepette 36D -Build-
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« Reply #195 on: October 07, 2011, 12:00:55 PM »

As always BG, it looks great.  When will you put it thru its paces?
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« Reply #196 on: October 07, 2011, 03:59:09 PM »

Hi All,
Lee....I will be at the Sierra cup (where I will make my Debut in F1B). I am tempted to bring her with me but not sure I wanna do my testing on that hard packed earth. It is too windy and rainy up here at the moment.
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« Reply #197 on: October 07, 2011, 04:19:12 PM »

Bernie, do pack her along!
My TLGs & I are nearly to LH BTW.
Bring gaters to fend off stickers or
socks will suffer!
NO FEAR!!!

Leeper


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« Reply #198 on: October 08, 2011, 09:40:56 PM »

Ok Done,
Will have two gliders with me....
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« Reply #199 on: October 17, 2011, 12:40:32 PM »

I had the pleasure to fly our SW36 TLGs yesterday with Bernie[aka BG] at Lost Hills.
I can attest he did a very nice build,which has his RDT setup integrated nicely.
Plus it is flying better after a few minor tweeks.

Sorry we were too busy funflying to remember to take any pix!
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