Divinity, 42" KFm4 Slowfying wing. - Page 3 - RC Groups
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Apr 10, 2009, 11:08 PM
Father Francis, formerly Apach
Quote:
Originally Posted by Daddy-O
I've decided to build this with blucore instead of the epp that I have. I don't see any reference to a spar for this plane, so I assume that the original was not built with one, right? I should get it built tomorrow morning. No promises for the electronics though. I have quite a bit to do tomorrow, so I am squeezing in the build. I expect to maiden it on Monday morning. I'll try to get a video of the maiden flight. No spar, right?
Daddy-O


You are correct, Divinity has no spar.......wing has slight flex.when holding it from one wing tip. Do NOT remove skin from FFF or bluecore.
I would say that if you find your divinity wing to flop like a wet noodle that you apply strapping tape to the top and bottom along the center of gravity to eliminate the access. You only want it to flex 1/2 to 1 inch.../....again, no spar.

Good luck with the build and keep us posted...

ApachePilot
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Apr 11, 2009, 06:45 AM
Jack
jackerbes's Avatar
There is no spar in it as it has been built and flying so far, I think it is that the layers of that foam from the foam board (with the paper removed first) that ApachePilot is using has enough stiffness when they are glued together. He is also reinforcing the wing with the strip of 2" wide nylon filament tape on the leading edge.

I've never used any EPP but have some FFF. I cut the templates out yesterday to and plan to make one out of that to see how that will work. The FFF is pretty light and not real strong in one layer but with the plastic coating on one side, the layers glued together, and the tape, it should be strong enough.

The FFF is about .200" to .220" thick, the foam board less than 3/16" (.1875") so the FFF will finish up a little thicker. How thick is the EPP?

Jack
Apr 11, 2009, 07:06 AM
scrapy scrapy doo.
roonroon's Avatar
Hi,

Congratulations and thanks for sharing this with all of us.
That's a great flight, I gonna build it out of Depron
Maybe I can challenge your flighttime when I have my holliday at the Cape the Azur (France)
At least I can try it.;0

Gtreetz Ron
Holland
Apr 11, 2009, 07:52 AM
Father Francis, formerly Apach
Ron,

I want to thank you sire.....

Divinity is a very inexpensive wing, materials for the airframe are only a few dollars. Thanks to the KF airfoild given to us from Dickeroo, we have a multitude of new platforms that have taken flight. Divinity still floats along as graceful as ever. Since building Divinity, I have had but one accident, I had gotten too high above the buildings in town and the wind was high. I hit full down from about 100 feet altitude and nosed into the ashfalt.Divinity split in half. I went back to the room in which I was staying, pulled out a few drops of 5 minute epoxy, a squirt of hot glue and a 4 inch piece of strapping tape and was back out flying Divinity in the motel parking lot 5-10 minutes later. I do believe the epoxy was overkill though...tape alone would have been enough to get airborne.

I, as well as others here await your pics and, sir...I am humbled.

I await your challenge...

Great luck to you ....


ApachePilot
Apr 11, 2009, 08:29 AM
Father Francis, formerly Apach
Quote:
Originally Posted by davor21
I make one by yours plans only I put hevy battery and brushlles on it and still fly very beutifuly.Her is few pictures during making of the wing.I become a fan of the wing.

http://img17.imageshack.us/img17/2594/dsc00764aru.jpg
http://img19.imageshack.us/img19/5249/dsc00765kpc.jpg
http://img12.imageshack.us/img12/5475/dsc00766v.jpg
http://img6.imageshack.us/img6/9339/dsc00767l.jpg
http://img11.imageshack.us/img11/1706/dsc00768t.jpg
http://img18.imageshack.us/img18/1934/dsc00769x.jpg
http://img6.imageshack.us/img6/7183/dsc00770p.jpg
http://img24.imageshack.us/img24/5769/dsc00772pqy.jpg
http://img18.imageshack.us/img18/8241/dsc00773xtg.jpg
http://img15.imageshack.us/img15/7748/dsc00775yox.jpg
http://img12.imageshack.us/img12/7646/dsc00776sbd.jpg
http://img8.imageshack.us/img8/5633/dsc00777h.jpg
http://img5.imageshack.us/img5/3562/dsc00778g.jpg
http://img4.imageshack.us/img4/5526/dsc00779qun.jpg
http://img14.imageshack.us/img14/501/dsc00780e.jpg
http://img12.imageshack.us/img12/4104/dsc00781fvu.jpg
http://img11.imageshack.us/img11/2905/dsc00782x.jpg


Davor21...

Excellent job....looks better then the original....I am very pleased you like it..

Do you have a way of getting video? That would be great to see....PLease feel free to report any and all issues you encounter...I hide nothing here....

It would be nice to see another video of Divinity doing what she does best...

Again excellent job!!! Well done!!!

ApachePilot
Apr 11, 2009, 09:46 AM
Registered User
I am very pleased that you like the wing which a made, but a just forget to say a make the wing from 6 mm depron.And soon as possible a will put the video of my Divinity
Apr 11, 2009, 10:45 AM
scrapy scrapy doo.
roonroon's Avatar
Quote:
Originally Posted by davor21
I am very pleased that you like the wing which a made, but a just forget to say a make the wing from 6 mm depron.And soon as possible a will put the video of my Divinity

Hi Davor21

Have you made any use of Carbon tubing in the wing??

Greetz Ron
Apr 11, 2009, 11:08 AM
John 3:16
Daddy-O's Avatar
Quote:
Originally Posted by ApachePilot
Welcome to the world of "Diviinty" , my attempt in designing a larger slow flying all around wing. As the title says, Divinity is built using a KFm4 airfoil, has a 42" span and comes in between 2-3 ounces RTF...
ApachePilot
That foamboard must be a lot lighter than the old blucore with the skin on both sides of the foam. I just finished my airframe, and it came to 3.8 ounces (airframe only). I have been building planes for a while now, and know how to build light. That is what I tried to do here (no heavy glues, no paint, no hot glue, no epoxy, etc.). I would challenge someone to get an ounce lighter on the old blucore. I don't think it is possible.

I will try to get some electronics installed later today. If I do, I will let you know what the AUW is of my completed Divinity. BTW, I peeled off the skin where foam touches foam. I always do that so that I get a good connection. It will not need a spar or tape as long as it isn't flown really fast. Like ApachePilot said, if you want to make it stiffer, you can put strapping tape on top and bottom. You could fly it pretty fast and get a little crazy with it like that (IMO). I need to do a little sanding to the LE, so I may knock off just a bit of weight doing that.

This has been an extremely easy build so far, and hasn't taken hardly any time to complete the airframe. I am looking forward to the first flight to see how it does. Even though it is heavier than ApachePilot's, it should still handle very well and be a floater.

Daddy-O
Apr 11, 2009, 11:16 AM
John 3:16
Daddy-O's Avatar
Quote:
Originally Posted by davor21
I am very pleased that you like the wing which a made, but a just forget to say a make the wing from 6 mm depron.And soon as possible a will put the video of my Divinity
davor21, do you know what your AUW is on your Divinity? It would be great to know for a comparison. It would be good for future builders to know what motor/battery/prop combo you are using. It looks great! I'm glad to hear it flies well. Congratulations.
Daddy-O
Apr 11, 2009, 11:51 AM
John 3:16
Daddy-O's Avatar
I just finished sanding it, and decided to weigh it again. It went from 3.8 ounces before sanding to 3.9 ounces after being sanded. I'm not sanding it anymore! It makes me question the accuracy of my scale. Maybe I didn't have it setting on the scale square the first time? I don't know. Anyway, it looks like it is about 3.9 ounces before the electronics.
Daddy-O
Apr 11, 2009, 12:37 PM
Registered User
Setup at the moment which i put is
Baterry: http://www.hobbycity.com/hobbycity/s...0C_Lipoly_Pack
Speed Control: http://www.hobbycity.com/hobbycity/s...rogrammability
Brushless: http://www.hobbycity.com/hobbycity/s...?idProduct=664
Prop:Slofly 8*6
Servo: http://www.hobbycity.com/hobbycity/s...ec_Micro_Servo
I was curios how is going to fly with this setup it was meant for another plane.
Sorry for my bad english
Kind Regards from Croatia
Last edited by davor21; Apr 11, 2009 at 12:42 PM.
Apr 11, 2009, 12:41 PM
Registered User
I forgot to write my Version of Divinity was heavy aprox. 340 grams thats RTF with electronics.
I did not any put carbon tubes.And this my alternitive setup for Divinity which I ordered yesterday.
http://www.hobbycity.com/hobbycity/s...idProduct=6473
http://www.hobbycity.com/hobbycity/s...idProduct=4254
http://www.hobbycity.com/hobbycity/s...idProduct=5379
I going make another two wings every body enchanted with Divinity.
To day after five flights with Divinity a smashed from 10 metars high battery completely empty.Wing is brokeen but with CA glue its flying again.

Looking forward to see plans for Champion Wing
Last edited by davor21; Apr 11, 2009 at 01:34 PM.
Apr 11, 2009, 02:45 PM
Father Francis, formerly Apach
Daddy-O,

Glad to see you have your Divinty build underway...Something wrong with those figures... Sanding usually is done to remove access weight..not add to it... .
Nice to se how you are progressing, you are correct in the fact that there is very little building time involved. I am sure you will be very happy with Divinity during the maiden,.....

Keep us all informed.



Davor21,

Great to see that others enjoy Divinity as well, ....
You are correct in the fact that it takes very little to get Divinity flying after a crash or mishap....That is all in the design... I would definately try lighter electronics, If you think Divinity is a good flyer now, try lighter electronics and watch the vast performance increase and float ability. Your flight times will increase also as not much power is needed to keep Divinity aloft. At 300 grams+ at which trottle setting do you find yourself needing to maintain altitude? I only need 1/4 throttle.

Keep up the great building and keep us all posted....


ApachePilot
Last edited by ApachePilot; Apr 11, 2009 at 02:56 PM.
Apr 11, 2009, 03:06 PM
John 3:16
Daddy-O's Avatar
I just finished my Divinity. It weighs in at 10.3 ounces or 292 grams. I could have saved quite a bit of weight on the motor and battery, but as I was choosing these, I got kind of a crazy idea. I have a bunch of J250's from back when they were the hot thing, so I decided to use that in a GWS C gearbox. I'll probably put a sf 9x6 prop on it for slow, high torque flight. I am using 2s 500 lipos in this one. I did not have the bendable push rods either, so I put my servos out on the wing. I'll get some pics before I maiden it. Can anyone check out the wing loading for me on a 10 ounce Divinity? I'm not sure how to do that. I'm looking forward to seeing how it flies. I have a lot of different brushless motors that I can choose from if I decide to change the setup. I also have lighter 2s and 3s battery packs, so I can make it lighter. We'll see how this "heavy" 10 ounce Divinity does first though. I'm looking forward to Monday!
Daddy-O


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