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Old Mar 26, 2009, 07:32 AM
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Devon UK
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Tail feathers?????

COPIED FROM MY THREAD----SORRY

Millions of Question????'s

Why are nearly all DLG feathers I've seen all very similar?
I know the short answer probably is because that's what works,
but has anyone tried and proven a more rectangular design?
Dos Quano seems to be begging for one!

PG
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Old Mar 26, 2009, 10:33 AM
Make Flying Fun
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United States, MD, Lutherville-Timonium
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Barnes Planes

Phils 2005 ships!
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Old Mar 26, 2009, 01:18 PM
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Palo alto CA
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And now we are in 2009.

This is an arms race, not a hobby.
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Old Mar 26, 2009, 02:55 PM
Where'd The Wise Men Go?!?
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2008?
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Old Mar 26, 2009, 03:08 PM
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yep 3008

PG's great great great grandfather
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Old Mar 26, 2009, 03:51 PM
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RECTANGLES are for beer cases ,,,ever seen a rectangular bird? lol SL
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Old Mar 26, 2009, 04:06 PM
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PG,

It is interesting to note you comments regarding tailfeathers. Around 2001-2003 there was considerable experimentation done with regard to AR and Area. Most of the thoughts settled on and pointed to Dr. Drela's SG tail planform, however many designers in the West pushed for more low AR rudders to dampen wag. Some of the wag issues were handled by reducing wingtip weight via various methods. Most designers, IMHO, tend to just put on SG-type tailfeathers because they are just simple and light. I, among others, think that there are other tail designs that can influence plane launch and handling characteristics. For example, some Europeans are going to bigger rudders, and some with not moveable rudder, and this is to prevent slop form inducing tail wag and cutting launch height. Note that in general, 1 wag equates to 10 ft of height. Other tailfeather issues address drag, airfoil sections for lower wag drag, and simple lightness. Overall, again IMHO, tails are the way they are just for portability.

Original designers tend to try different things to fit their styles. Others just go along with the pack.
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Old Mar 26, 2009, 04:25 PM
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Devon UK
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Original designers tend to try different things to fit their styles. Others just go along with the pack.[/QUOTE]

Thanks for replies--you can all see where I'm coming from
All I know is there is ALWAYS an exception to any rule
So therefore- thank you very much-a retangular stab and rudder is where I will be going!!

Thanks again
PG
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Old Mar 26, 2009, 05:48 PM
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Ha! I try and be witty and look what happens...

2009... we are in 2009...
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Old Mar 26, 2009, 07:07 PM
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Germantown, Maryland
Joined Apr 2004
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Trivia question

Does anyone remember why the tails on my 2005 models were so rectangular? There is a reason, and I'm pretty sure its been posted in this group before.

I've decided to provide the answer to the trivia question. The diagram below shows a foam core shape that can be cut and used for all tail parts. Just cut two of those cores and then slice them into the four pieces needed. This is faster than cutting four separate cores and it is easier to cut the larger cores than the much smaller and more highly tapered cores.
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Last edited by Phil Barnes; Mar 26, 2009 at 07:28 PM.
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Old Mar 27, 2009, 03:26 AM
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Kinda all natural ?

PIG
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Old Mar 27, 2009, 07:02 AM
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Devon UK
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What amazes me here is that no one has given me a reason why not to--
so on it goes

PG
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Old Mar 28, 2009, 08:57 AM
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Devon UK
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The paper originals and new more rectangular prospects

Thanks for all input

New solid balsa wing,stab and rudder cut yet to be foiled

I am developing a system to make these biscuits easily changed so will cut original spares as well to experiment with

I'm loving this

PG
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Old Mar 29, 2009, 04:23 AM
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Tucson, AZ
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Phil,

I admire the ways you find to simplify things! From reading the threads over the last few years, it seems that you have come to favor balsa tails over the foam tails. But I think the obvious question here is. . . do you believe that any of the various tail designs you've tried over the years have performed noticeably better than your 2005 rectangular tails?
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Old Mar 29, 2009, 09:13 AM
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Most of my recent models have had foam tails. My first TabooGT was a 100% stock, unmodified kit, so it had the balsa tails. Since that model, I have built quite a few models similar to the TabooGt. On most of those models, I made tails to the same shape and size as the TabooGT tails, but made them with foam cores and Kevlar skins. See the first link below. I also made a couple models recently with balsa TabooGT tails.

I'm not one who would notice any difference between lower aspect ratio versus high aspect ratio or rectangular versus tapered tails. There is likely an ideal taper and aspect ratio for DLG tail parts and I'm guessing that the SG tails are likely somewhere near to the ideal based on some reasonable design criteria. The peformance difference might be pretty small though, and hard to notice for most pilots.

http://www.rcgroups.com/forums/showt...53#post5523753

I ran across the following thread while searching that last link. It is an excellent resource in case some of the newer group members may have missed it:

http://www.rcgroups.com/forums/showt...light=tabooish
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