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Old Feb 09, 2012, 10:15 AM
usaf3kteam
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Originally Posted by JOLOVINS View Post
40s, thats a heat wave here...
You should go flying today in the 30s?
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Old Feb 09, 2012, 12:03 PM
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Germantown, Maryland
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Originally Posted by samc99us View Post
I have been putting the disser right on the outside lately. However, I think the reason for putting the disser skin on the inside is entirely related to QC. When you place the disser cloth on the outer skin, it is easy to distort those fibers during the layup. Also, it is possible that the fibers start peeling at the LE of the wing. Placing the disser inside eliminates this problem as the cloth would be 3M'd to the foam at that point. The <2mm loss in separation distance between the lower and upper skins is likely a negligible loss in overall torsional stiffness.

Doesn't the Stobel come in a double disser variety with disser on the inner and outer skins?
The double Disser Stobel has the disser threads spaced more closely, all on the inside face of the inside skin.

With the disser on the inside face of the outside skin, the disser only extends as far as the inside disser glass, which in the case of the Stobel and the Concept, should mean that it only goes just over the edge of the spread tow, not to the LE of the wing. That would save a little weight with less disser thread weight and maybe add a tiny bit less torsional stiffness as compared to taking the disser all the way to the LE.

I'll see you Sunday Sam, and you can decide whether you think the disser on the outside skin is a problem during the layup.

By the way, since this is a Concept thread: Did you notice that the disser on the top skin of the wing is exactly aligned over the disser on the bottom skin of the wing? That's not a coincidence, it's an indication of totally awesome craftmanship!
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Old Feb 09, 2012, 12:17 PM
Aurora Builder
United States, MD, Lusby
Joined Nov 2003
3,376 Posts
Disser on the outside skin has been working ok for me as long as I don't cut the glass too small to begin with!

Getting the upper and lower dissers aligned is very much awesome craftsmanship, and at $600+ for a wing I would expect nothing less!
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Old Feb 09, 2012, 12:42 PM
Chuck 'Em and Chase 'Em
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United States, NY, Plainview
Joined Aug 2005
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All I can say is I hate bank wire transfers .

They had all my information wrong. Sure, the bills come to the house but go do a wire and none of it was up to date!! Yet we moved over 5 years ago!!!
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Old Feb 09, 2012, 01:08 PM
a.k.a. Matt Nelson
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North Tustin, CA
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Quote:
Originally Posted by Phil Barnes View Post
Did you notice that the disser on the top skin of the wing is exactly aligned over the disser on the bottom skin of the wing? That's not a coincidence, it's an indication of totally awesome craftmanship!
I doubt it's a coincidence The disser on the right and left wings are also perfectly symmetrical. I think Roland has a touch of OCD... his craftsmanship is second to none.
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Old Feb 09, 2012, 01:38 PM
usaf3kteam
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Ok 12:00 went and threw 20 throws temp nice 66d 1 mile an hour wind threw about five then got on it and out of 20 throws 184' to 186' throws they were mixed up so 185' consistence sounds right. I am more consistent know that I can not throw as high as I used to. When I went to the JEM was throwing about 165' consistent and it hurt no hurt today knee better and shoulder also feeling much better just need to get out and work harder and I will.
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Old Feb 09, 2012, 01:49 PM
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rcgeorge:

You be careful, ya hear?

Yours, Greg
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Old Feb 09, 2012, 02:03 PM
usaf3kteam
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Originally Posted by glidermang View Post
rcgeorge:

You be careful, ya hear?

Yours, Greg
OK Cheers
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Old Feb 10, 2012, 10:04 AM
Chuck 'Em and Chase 'Em
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Order and money has been send and acknowledged by Roland.

I asked if it was possible to do an Orange wing and sent him a very rough idea of what I had in mind. He also showed me a stripe pattern that looks really nice that i asked if I could get as well.

I just love the diagonal triplet stripes!!!

Thanks Roland.

By the way, Roland was super helpful in the purchase and went beyond beyond in supporting me with making a decision and offering advice on what to get. Regardless of the quantity of money, it was money well spent just to support a great guy.

thank Roland. I hope I'll have the funds to do business again soon!

Frank
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Old Feb 10, 2012, 12:55 PM
usaf3kteam
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Originally Posted by Fly2High View Post
Order and money has been send and acknowledged by Roland.

I asked if it was possible to do an Orange wing and sent him a very rough idea of what I had in mind. He also showed me a stripe pattern that looks really nice that i asked if I could get as well.

I just love the diagonal triplet stripes!!!

Thanks Roland.

By the way, Roland was super helpful in the purchase and went beyond beyond in supporting me with making a decision and offering advice on what to get. Regardless of the quantity of money, it was money well spent just to support a great guy.

thank Roland. I hope I'll have the funds to do business again soon!

Frank
Can I have one of those very cool
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Old Feb 10, 2012, 01:34 PM
Chuck 'Em and Chase 'Em
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Only can afford one right now and I hope Roland can make it in orange. This new stripe pattern is much nicer than the diamonds, circles or even the wide stripe pattern he had before. IMHO.

I would suggest that he could vary the available striping stensils each year as it could give an indication of when it was produced on sight. not to mention would add further variability to the CX2s in the sky making it easier to pick out which bumble Bee is yours.

Mine will be the great pumkin or the great goldfish ......
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Old Feb 10, 2012, 02:52 PM
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I have 2 of the greens in that pattern, and the tails are the same color.....
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Old Feb 10, 2012, 08:48 PM
Zeus
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Joined May 2008
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Some very interesting DLG physics

Since my early beginnings with DLG planes, I found a common habit of any plane I flew that time, the habit to bank to the left (on right hand throw).
At first I suspected a twisted flap or even the whole wing perhaps was twisted...? Without bothering too much with the quite complex physics involved, I tried to measure the wing(s) for any suspected twist..... and couldn't find any deformation significant enough to cause the planes to roll that much.
Intuitively I tried to compensate this roll momentum by setting the flaps in a asymmetric way, until the plane went into a straight launch path.
I suppose that many of you have made the similar experience and do exactly the same thing..... If not, you might follow this suggestions to improve your launch height, at least what can be improved at the side of the planes efficiency during launch.

On the way to build and improve the first Concept generations, I was trying to analyze this very complex physics involved. A consensus of the very interesting analysis results can be found in the attached PDF.

wish you happy testing and improving.....

Roland
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Old Feb 10, 2012, 09:35 PM
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Germantown, Maryland
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The date on that pdf is March 23, 2010. Could be something drawn up as an April fools joke for 2010. The reasons given for the roll tendency after launch are correct and well known for a long time. See this link:

http://www.rcgroups.com/forums/showt...05#post5660781
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Old Feb 10, 2012, 10:05 PM
Zeus
Wild East
Joined May 2008
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Quote:
Originally Posted by Phil Barnes View Post
The date on that pdf is March 23, 2010. Could be something drawn up as an April fools joke for 2010. The reasons given for the roll tendency after launch are correct and well known for a long time. See this link:

http://www.rcgroups.com/forums/showt...05#post5660781
Dear Phil,

since we do not have April so far it was not ment as such, rather than an informative illustration of what many people might know, but still don't understand, since I receive many questions about. Well, it is an analysis I have done in 2010 but never published. Now it is, some people might find it interesting and the quite substantial work on it was not done in vain after all....

Btw. your link is well known as well, but completely related to the side slip as such. In this simulation made by Mark Drela, the lift distribution and influence of negative flap settings is not covered. Perhaps on focusing at the date too much you missed the difference..:

Roland
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Last edited by KINETIC; Feb 10, 2012 at 10:39 PM.
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