Delta & Flying Wings Discuss electric powered delta (flying wing) style aircraft here.

Limit-Delta. [FLOWN!]

Old 02-12-2008, 03:14 AM
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fr4nk1yn
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Default Limit-Delta. [FLOWN!]

So I've got this "obsession" for this plane called the Limit-Ex.
I was building another yesterday and was having trouble cutting the nose wide enough to fit my motor behind the firewall by TLAR.

So I decided to use AutoCad and reshape the base of the fuselage to make it easy on myself and foam.

What does this have to do with deltas? I got a little carried away in AutoCad (:

I figure on using a single fin. But a V-Tail like the f-117 would probably be much more Limit-Ex like.
I'm not sure what to do for verticals, I'm still scared from the last two wings I built and the horrible tip-stalling they had ):

It a work in progress. Length 17", wingspan 22", both the same as the Limit-Ex.

Thread has been "cleaned" a bit. Old plans removed, new plan moved to 1st post along with a tiled version thanks to segraves at "the other" forum.
**WARNING**
The plane NEEDS to be somewhat trimmed before flying.
Probably elementary advise, but the plane will go into a fast flat spin if not trimmed. It is recoverable but "Scarey".
Attached Files
File Type: pdf
Limit-Delta_Beta2.pdf (103.0 KB, 175 views)
File Type: pdf
ldb2_tiled_LETTERL.pdf (106.5 KB, 115 views)

Last edited by fr4nk1yn; 02-17-2008 at 05:57 PM.
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Old 02-12-2008, 03:19 AM
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pburt1975
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Franklin, do you have a side view of it? Is the fuse going to be rounded/shaped?

I like elevons on wings, a rudders not much use, but it is fun. What kind of wings were you having problems with?
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Old 02-12-2008, 03:26 AM
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I haven't worked on the side view yet. That I think will be a little harder than the top view.

For now the fuselage will have sanded corners. That's the extent of my building so far.

No rudders, just a stabilizer, it'll use elevons.

I built two Mugis. One 24" then another at 26". After the 24" I increased the verticals. It was still so unstable I retired if after the maiden. The 24" took out my RX(?) and Li-Po plus bent my Thunderbird 18 in two. Still works though (: I'm glad I wanted to send it in and have it upgraded to the 3amp BEC.
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Old 02-12-2008, 03:34 AM
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Ooo man this one looks slick. Im gonna have to follow this one and learn a few things or two. Nice plans!
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Old 02-12-2008, 04:37 AM
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I was right about the side view.
I figure 2° down thrust will be safe, I probably should put in some right thrust as well.
I also figure on about 1.5°AoA.
So does that mean the wing incidence should be ½°? Oh My brain hurts.
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Old 02-12-2008, 05:40 AM
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Here's the rough side view.
The way I see it there's a "strip" of foam along the underside of the wing for a skid plate and a little something to hold for launching.
Cut along outside line for fuselage bottom, inside line for top. Easy

Now I am gong to bed. Tomorrow I'll clean it up some and internal bracing.

Last edited by fr4nk1yn; 02-16-2008 at 02:16 AM. Reason: forgot to attach PDF.
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Old 02-12-2008, 06:04 AM
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Looks like you're doin' a real good job Fr4nklin.
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Old 02-12-2008, 11:47 AM
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Im sorry if im a little bit slow but is it a flying wing kinda thing with a fuselage? or is there tailfeathers? Looks great so far!
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Old 02-12-2008, 11:52 PM
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Default Mugi Evo

Hi Franklin,
Re "I built two Mugis. One 24" then another at 26". After the 24" I increased the verticals. It was still so unstable I retired if after the maiden. The 24" took out my RX(?) and Li-Po plus bent my Thunderbird 18 in two. Still works though (: I'm glad I wanted to send it in and have it upgraded to the 3amp BEC"
I also built a 600mm/24" Mugi Evo having succesfully flown the standard 800mm one. It was great fun once airbourne but getting it away was a real problem. Really needed a bungee launch to get it up to speed and once up there lots of expo and only low rates when flying low as very twitchy. My most successful Mugi is a 1m one. It always gets away cleanly and flys OK on anything from a 150 watt motor with a 3 cell 2100 mAh pack up front. Would really rock with an Align 430 heli motor - vetical take off anyone?
I hope you used 2 mm correx as anything thicker would be too heavy on the smaller versions. If you decided to try again then I would suggest you visit the Yahoo Mugi forum http://groups.yahoo.com/group/rcmugi/
Good luck with your foam jet.I've a sheet of black 6mm depron just looking for the right plane!
Andy
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Old 02-13-2008, 12:06 AM
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The battery in my notebook went dead while trying to reply at work ):

Yes GA92, it's a delta with a fuselage to hide the gear but besides the fixed vertical stabilizer there's not tail.

Tonight I'm gonna work on the wing design and change the side view a little.

I like a double thick folded wing for strength. I'll add another cut line to the side view for those that like a flat wing.

My planes have a way of not flying. Hence the name (: Better wait before cutting depron.
Oh yeah BTW the Mugis where pink foam.

Last edited by fr4nk1yn; 02-13-2008 at 05:10 AM.
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Old 02-13-2008, 12:41 AM
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Franklin, how fast are you planning on going with it? Have a look here
http://www.wattflyer.com/forums/show...0&postcount=22

I think you should go ahead with the current design, be sure to add some reflex with the elevons with the flat plat, and install a solid spar at the COG. This design flys great, its easy to build and fun.

BTW - this design with the 2408 on 2s isnt wicked fast, but I'd say mid 30's and Im sure 50 is not outside of its range. And cutting the dimensions down 2" on 2 sides makes it a little quicker. It'll take ya an hour or 2 to build, 2 sec to figure out in the air with your ability.
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Old 02-13-2008, 12:46 AM
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yup Pburt,
About 2 seconds in the air will do it.... Instant lessons..
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Old 02-13-2008, 01:54 AM
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Originally Posted by Airhead View Post
yup Pburt,
About 2 seconds in the air will do it.... Instant lessons..
Should I change that to 4seconds? it really is an easy plane to fly.
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Old 02-13-2008, 03:56 AM
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Dern, I had to make a run and forgot to submit.

I'm not big on flat plate wings. I only built one, a bi-plane and it was a lot more pitch sensitive than what I'm used to. Besides I love the "WOW Factor" I get when I break one of my fuselaged planes out the first time (;

So then whole time the post was waiting to be submitted I worked on the "plans".
Here's a small version of what I think is finished.
Let me know if there's anything obviously wrong or could be improved.

I still need to figure out how to print a full sized PDF, I may have to change programs again, then run one off at Kinkos to see how it looks and builds.

I've become used to using a servo tray that runs the rear of the fuselage. It really adds strength and mounts the servos pretty good to. I don't think it's needed here since the fuselage will be glued to the wing. It also would interfere some with the vertical stabilizer.

Take a look. \=?

Last edited by fr4nk1yn; 02-16-2008 at 02:16 AM.
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Old 02-13-2008, 02:08 PM
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If the size is already setup, I can print them here but that doesnt really help you much. I could ship'm, but would probably cost just as much as having it printed elsewhere.

I was looking at Nitroplanes (not to buy, just looking) and saw this

Not to far off of your design
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Old 02-13-2008, 07:32 PM
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I have a RC2 PDF that I printed, I at work and can't upload, My USB is broken on the notebook.
It looks larger than I thought.

Building starts tonight in pink foam just to see.

If it's good final plans will be posted.
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Old 02-14-2008, 02:37 AM
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Not much interest here but I'll post the final anyway.
I just need to clean up the folded wing instructions. I hit bold by mistake somewhere and since I was using a work around I'll have to type everything over. I'd rather start building.

-edit- Fuselage built in about 1/2 hour. Lined up perfectly. So far so good. LOTS of room for Li-Po and outrunner.

Last edited by fr4nk1yn; 02-16-2008 at 02:17 AM. Reason: Changed Plans
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Old 02-14-2008, 04:51 AM
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How are you building the fuse? Sanding down a block of foam or shaping the FFF?
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Old 02-14-2008, 04:53 AM
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I'm gluing the FFF, beveling then sanding.
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Old 02-14-2008, 04:55 AM
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ok man, sorry if Im wearing you out with questions.
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Old 02-14-2008, 05:49 AM
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Your not wearing me out at all.
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Old 02-15-2008, 05:08 AM
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I like it!!!!

Keep it comming

Randy
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Old 02-15-2008, 05:24 AM
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With that encouragement here's the last plan I did.
The fuselage is thinner. The first looked chubby when built.
One person at another forum nuked the plan especially the wing layout. I think the quarter pattern is effective and keeps the print out smaller and cheaper.

Also, perhaps I'm doing it wrong, when I built the Limit-Ex I had to tape the template back together to cut the fuselage after cutting the wing.
The layout now has no overlapping cuts.
I'll try this out tomorrow when I get it printed. Maybe I can get it flying by Sunday.

Last edited by fr4nk1yn; 02-16-2008 at 02:18 AM.
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Old 02-16-2008, 04:50 AM
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Here's what your get with Limit-Delta plans, some pink foam, hot glue, a razor and an hours time. Oh yeah, Some sandpaper too.

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Old 02-17-2008, 01:28 AM
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Well... *sigh I'm back from the field. Winds are about 8mph and it's 40°.
I guess I should've wore a jacket but that wouldn't have helped my fingers any.

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I figured the 6x4 APC Sport prop and 1300mAH 2s would give me plenty of thrust for the maiden.
The motor is my Emax 2805 rewound with 10 turns of 23 awg making it close in performance to the original.
Not 1:1 so I give it a hard throw it it immediately rolls inverted to the left )':
I counter level it off and for some odd reason let go of the stick and completes a full roll!
Then I do something that sends it into a furious flat spin. At least it landed flat on the belly.
I'm thinking: "Is the vertical too small?!". So what's left to do?
Launch that S.O.B. underhand, trim it out and have a great flight!

When I built the wing I noticed the tips were twisted up some so I just stressed it with tape to even it out and "give me some washout".
Not a great idea cause it took a lot of right and a lot of up to balance it.

Once trimmed it has the same characteristics of the Limit-Ex.
Not very fast, due to my motor I'm sure. Stable, no bad manners. Rolls, loops, and of course Split-Ss and Immelmans.
Glide is superb. Cut the power about 70 feet up to land and had to spiral down, it just wanted to float.
But unfortunately just like my powered Limit-Ex the nose broke on landing. I need to try using the brake and see if that helps any.

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CG in the plan is confirmed, those design programs are great. The vertical stabilizer size was also picked by the program btw.

Now the bad. With the long nose and front mount motor, balance could be a problem without adding ballast.
Not too much of an issue I guess. IIRC my old delta needed almost two in the very tip of the nose to balance it.

Of course nobody wanted to come along but it's just as well. I like maidens by myself.
I'll try focusing my CVS camera and getting some video tomorrow.

Oh I forgot. AUW is 8.5oz. Without power system: 4.5oz.
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