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-   -   Delta (http://www.rcuniverse.com/forum/s-p-d-aircraft-coroplast-design-178/7089029-delta.html)

mclina 02-17-2008 10:16 AM

Delta
 
1 Attachment(s)
Is it wrong to enjoy the smell of a dremel wheel cutting through PVC?

I found a picture of a delta wing SPAD that I thought looked really cool, so I decided to imitate it. This thing has a 24" fuse, 36" wingspan, a music wire stiffener, and 8" stabilizers. I am planning on powering it with a .25


mclina 02-17-2008 10:18 AM

RE: Delta
 
This was the guy that gave me the inspiration:

http://www.flying-models.org/discussion/cororoo.gif

acarter 02-17-2008 01:40 PM

RE: Delta
 
Looks good!:D
Austin

MrGreenSpeed 02-17-2008 02:49 PM

RE: Delta
 
Don't think a 25 will have enough power
Most people are using 46 and 47 size engines on the CoroRoo and BullDawg.
The pic of the CoroRoo You posted, has an ASP 52S with purple pipe running on an APC 11x9 and taking the manifold down to about 3" made a huge difference to the rpm!
You can find the entire build thread and plans at( You'll have to register to log on )
http://www.spadcombat.co.uk/spad/
In the SPAD Builds and Construction forum on page (4) topic miniCororoo

Jeff

microsprint9 02-17-2008 06:24 PM

RE: Delta
 
I think a .25 will be enough, look at my delta on post #3 of this link http://www.rcuniverse.com/forum/m_6960015/tm.htm it's a 36" span and weighs 43oz and it's only got a .15 on it, while it's not a rocket it does fly good.

mclina 02-17-2008 08:10 PM

RE: Delta
 
1 Attachment(s)
Thanks for the advice, both of you. My airframe is weighing in at about 28 ounces, with the elevon servos installed. It will be right around 2 pounds when I add the RX, battery, and throttle servo. With an engine, the weight should be pretty similar to Microsprint9's bird.

I know that most of the guys building these things are looking for extreme speed. I am looking for a fun flyer that looks different from my other planes. I have a couple of engine choices that I can borrow from other planes. I may try it with the .25FX from my combat spad, and if that won't fly it, I'll try the .46LA off my Four Star. I've been thinking of going to a four stroke on that plane anyway.

Here is a picture with the elevon servos, firewall, and some decals.

MrGreenSpeed 02-17-2008 11:22 PM

RE: Delta
 

Quote:

ORIGINAL: mclina

Thanks for the advice, both of you. My airframe is weighing in at about 28 ounces, with the elevon servos installed. It will be right around 2 pounds when I add the RX, battery, and throttle servo. With an engine, the weight should be pretty similar to Microsprint9's bird.

Sorry, didn't realize You were building a CoroRoo Light version.

Hope to see a flight report soon.

If it flies as good as it looks I might have to build one too [8D]

Jeff

kbear 02-18-2008 12:28 AM

RE: Delta
 
Looks like fun. It looks to me that the fold in the verts follows the fuse cut out. If that is so, they will act a bit like down elevator because they are basically a v-tail. Watch for that on launch. It might try to nose in on you. Take another look at the cororoo, and see that the fold in his verts is parallel to the wing. Good luck with the maiden.

mclina 02-18-2008 09:46 AM

RE: Delta
 

Quote:

ORIGINAL: kbear

Looks like fun. It looks to me that the fold in the verts follows the fuse cut out. If that is so, they will act a bit like down elevator because they are basically a v-tail. Watch for that on launch. It might try to nose in on you. Take another look at the cororoo, and see that the fold in his verts is parallel to the wing. Good luck with the maiden.
Good catch. I missed that.

Any advice on where the CG should be on this thing?

microsprint9 02-18-2008 10:19 AM

RE: Delta
 
You can download the original plans for this plane at http://www.spadcombat.co.uk/spad/ind...fileinfo&id=97

Smooth Spanky 02-18-2008 07:30 PM

RE: Delta
 
Thats a fine looking delta, Mclina, good luck with it!

Smooth

mclina 02-21-2008 07:14 PM

RE: Delta
 
1 Attachment(s)
Despite the disparaging comments (and puking smiley) over at Spadworld:

http://spadworld.net/forum/viewtopic.php?t=15166

I have decided to press on with this thing ;)

I mounted the engine and fit the RX and battery inside the fuse. I reworked the stabilizer mounts to level them out, but they are still a bit crooked. I have a bit of work to do to straighten them out, or I may go back to the drawing board back there.

With everything on it except a couple of screws and pushrods, it weighs exactly 3 pounds. The way our weather's been, it could be a month before this thing gets in the air anyway.


MrGreenSpeed 02-21-2008 07:42 PM

RE: Delta
 
When Your building a new design some people can't handle it and would rather put You down instead of encouraging You to succeed.
Don't let it get You down.
Sounds like Your getting close to the maiden flight.
Eagerly waiting the flight report.
As for the vert stabs, on the CoroRoo they put coat hanger wire in them to get them to hold there shape.
You could also just make a "V" tail out of one piece of coro for the tail feathers.
Jeff[8D]

mclina 02-21-2008 08:00 PM

RE: Delta
 
I like the V tail idea. The whole back end is a bit floppy as is. I glued in a piece of yardstick to stiffen it, but if I made a big V out of the stabs, it would tighten it right up.

Thanks

Smooth Spanky 02-22-2008 07:43 AM

RE: Delta
 
Mclina:
That's a fine looking delta...good luck with it. I built a bulldawg a couple years ago and never had much success with it, but most people seem to have good luck with the delta's in general. Looking forward to your maiden report.

Smooth

mclina 02-22-2008 09:54 AM

RE: Delta
 
1 Attachment(s)
The V tail was a great idea. I think it looks a lot straighter now. I also fixed the wing - if you look at the original wing bottom picture, it was not symmetrical. I didn't realize it until I had the striping tape on. I took the tape off one side and fixed it.

All it's missing now are the elevon pushrods. It is balanced about 1/2" in front of the CG on the cororoo plan. I think I will leave it there for the maiden flight.

And it's snowing like crazy outside.

mustangman177 02-22-2008 11:43 AM

RE: Delta
 
mclina:

I've been following and reading your thread and have built a cororoo too !!! I have a question about the construction of the elevons though.

On the plans it says

"Once the flaps have been folded over and glued, the elevon outer skins can be
made, cut a strip of 2mm corro approximately 76mm wide, flutes running the
76mm direction, and long enough to make 2 elevons. Score a center line and
and fold over, exactly as you would do when making a wing leading edge, these
are then glued to the elevon hinge parts, as per the pictures in the build thread.
This first "

I've folded over the top flaps, but am unsure how the elevon outer skins are made and attached. When I glued in the 4 mm. elevons between the top and bottom skins, I thought this was to be the elevons. Is there to be a 2mm by 76mm top skin glued to the top of this ?

I'm anxious to hear about your maiden flight !!! how are you planning to launch the cororoo ? Possibly hand launching like the PBF ? Looks little scary with a screaming .46 on the nose !!!

Best of luck-And by the way, your plane looks awesome!!

Cary

Villa 02-22-2008 11:55 AM

RE: Delta
 
Hi mclina
Nice looking plane. Does your wing have an airfoil crossection or is it flat at the top and the bottom?

mclina 02-22-2008 03:22 PM

RE: Delta
 
It's just a flat wing, a single layer of 4mm coroplast with a music wire stiffener. It isn't built the same as the Cororoo plans, it just has the same dimensions. It's probably more like a PBF.

I am planning on trying an underhand launch. I'll see how much pull it has when I fire it up and decide from there.

mustangman177 02-22-2008 09:26 PM

RE: Delta
 
Thanks mclina!!

Best of luck on the hand launch. I was thinking of doing the same with mine

MrGreenSpeed 02-22-2008 10:08 PM

RE: Delta
 
Quote:

I've folded over the top flaps, but am unsure how the elevon outer skins are made and attached. When I glued in the 4 mm. elevons between the top and bottom skins, I thought this was to be the elevons. Is there to be a 2mm by 76mm top skin glued to the top of this ?
Yes , 2mil folded and wrapped over and glued to the top and bottom of the 4mil elevons , it helps stiffen the elevons and makes them even with the top and bottom skin.
Making the elevons 4mil thick.
Jeff

mclina 02-23-2008 06:18 AM

RE: Delta
 
1 Attachment(s)
Last picture, I promise. I added some stripes to the tail, and took a shot from the side to show the profile of the stabilizers. I installed the elevon pushrods and programmed the radio. It is now 100% ready to fly. We got 8" of snow last night, so it will be a while before the maiden. I will have one of my kids shoot a video of the maiden, and I'll post it if it's not too embarrassing. OK, I'll post it even if it is.

Thanks again for all the good advice.

mustangman177 02-23-2008 07:11 AM

RE: Delta
 
Thanks Mr GreenSpeed !!!! It makes sense now.

mclina: Looking Good !!! Can't wait for the maiden on it. Keep us updated.

Cary

xray328 02-24-2008 12:23 AM

RE: Delta
 
Sorry about the puking smile thing.

The fins just didn't look right in the first picture you posted, but it looks great now. I wasn't trying to put you down or discourage you.

I've edit my post on spadworld and now publicly apologized. Sorry man.

I'm anxious to hear how your maiden goes.

I always worry about tossing any of these underhand, I can't get up nearly enough "umph" as I can overhand. It usually ends up pretty squirrelly from the toss to the sticks.

On totally trashed my GMS .32 on my sickle on two bad tosses, but I'm sure that was more a CG issue than anything else. I'm using a .40 on it now and it flys great. But it gets small really quick.

I'm concerned about this plane too though because it doesn't have a traditional airfoil and I've never flown a flat airfoil.

Anywho, keep us updated on the maiden. Best of luck!


mclina 02-24-2008 07:41 AM

RE: Delta
 
Hey, no problem. I thought it was funny. I knew there was something wrong with the fins, I just couldn't figure out how to fix them.

I haven't flown a flat winged plane either, and I also wonder what keeps them in the air. I am very curious to see if this thing will fly.

Thanks for the encouragement.


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