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Dec 29, 2009, 10:40 PM
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kansascloud's Avatar
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Discussion

lil Kansas JHAWK front yard flyer


Just wanted to show off my latest front yard flyer.

Sometimes simple and uncomplicated can be a refreshing change in a complicated world. My goal with this little airplane was to create a good flying and very simple design.

My secondary goal was to build an airplane out of parts that I already had laying around the shop. (zero $$$) Here is the result.

She has a 30inch KF2 airfoil constructed from scrap 3MM Cellfoam 88. The fuse is a piece of square CF tube I had laying around. Wheels are from a toy BMX motorcycle and the wing and motor mounts are from a scrap of birch that I found in the trash at a craft show.

Power comes from the very mighty Hobby City 18-11 2000 KV motor with a GWS 6x3 Prop. I run it on a HC Rhino 360mah 3 cells. and control it with a couple of HC $2.99 servos.

It flys conventionally in every restpect. It jumps off the ground and climbs very rapidly. I enjoy flying it off of the street in front of my home. It climbs quickly enough to get up over all the trees in short order. Because there isn't a lot of wing area I can dive back over the trees to the street and easily land without a lot of float.

The weather here has been rotten almost since the day I finished her so I haven't really gotten the chance to fly it in any really calm weather. The few flights that I have managed in semi calm conditions were a joy. The third flight accidently ended up with wind gust up to about 25 mph! The lil Jhawk just ended up flying backwards pretty much out of control the whole time. It was a VERY wild ride but I did manage land it.

It is just basic but I have enjoyed designing building and flying it a lot.

If any of you are interested in building something like it, you can probably come close to knocking one out just by looking at the photos I've attached. I do have a few templates of the wing crutches and a set of very weak plans. You can PM me if interested. I can e-mail to you if you promise to post photos of yours when you are finished.
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Dec 30, 2009, 06:58 AM
Registered User
That's cool...........
Dec 30, 2009, 08:39 AM
Ken's CAD Models
dz1sfb's Avatar
Nice job KC! Are plans to be released?

Ken
Dec 30, 2009, 08:53 AM
Vertical approach specialist
potshot's Avatar
Looks great! I'm looking to build something along those lines for indoor use. Any idea of the AUW? What size CF and wingspan?
Dec 30, 2009, 10:25 AM
Flying more::repairing less
trteboe's Avatar
Nice! Your plane has inspired me to make a travel plane. Fuse would be two peice design to allow tail appendeges to be removed. Perhaps an old two-peice fishing rod would work.
Hinged tail to fold down flat to horizontal stablizer and folding Kf wing. Everything could fit in your suit case or even a small carry on bag. Hummmm.........
Dec 30, 2009, 12:24 PM
Ken's CAD Models
dz1sfb's Avatar
Quote:
Originally Posted by trteboe
Nice! Your plane has inspired me to make a travel plane. Fuse would be two peice design to allow tail appendeges to be removed. Perhaps an old two-peice fishing rod would work.
Hinged tail to fold down flat to horizontal stablizer and folding Kf wing. Everything could fit in your suit case or even a small carry on bag. Hummmm.........
Very cool idea! Brief case plane.

Ken
Dec 30, 2009, 01:16 PM
Checking the wind
kansascloud's Avatar
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Glad you guys like. I will post a few templates as soon as I get to a computer where I can do some scanning. Once you have the wing crutches cut out you really have it made.

Just a few things to get you started in the mean time. Wing span is 30 inches, cord 5 inches. Dihedral is 3 inches. Length of CF tube is 20 inches. I think it is about 6cm?

Don't know the weight but it is light. I would not use a fishing rod for the fuse tube. That is going to be way to heavy.

Also... I may build another wing with a 34 inch span. Just a little more lift give it a little more cushion. The 30 works fine however and I like the compact size.

Templates on the way!
Last edited by kansascloud; Dec 30, 2009 at 01:28 PM.
Dec 30, 2009, 01:29 PM
Vertical approach specialist
potshot's Avatar
Quote:
Originally Posted by kansascloud
I will post a few templates as soon as I get to a computer where I can do some scanning. Once you have the wing crutches cut out you really have it made.
If you need CAD plans, send a PM.
Dec 30, 2009, 01:50 PM
Registered User
thermal's Avatar
Looks like a fun little flyer. I agree with you, sometimes simple is better!
Dec 30, 2009, 02:04 PM
Checking the wind
kansascloud's Avatar
Thread OP

Crude Plans


Wish I had the time and equipment to learn CAD. But anyway, this is a simple airplane, here are some very simple drawings. I think there is enough here to get you going if you want to try this one.

I will also post a bunch of extra photos.

I will be interested to see the versions that you guys come up with. Have fun!
Last edited by kansascloud; Dec 30, 2009 at 02:13 PM.
Dec 30, 2009, 07:29 PM
Ken's CAD Models
dz1sfb's Avatar
Plans are looking good KC. Would you comment on and give specs on CF tube wing saddle and LG position on the tube. Also is the KF step at 50%?

Thanks,
Ken
Dec 30, 2009, 09:52 PM
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kansascloud's Avatar
Thread OP
The forward wing saddle on mine sets exactly 4 inches behind the firewall. The landing gear is positioned immediately in front of the forward wing mount. You can see some detail as to how I mounted the landing gear to the 6cm CF rod with carbon fiber thread and CA glue. I found the thread at my local hobby shop. It was in the model rocket department. Used for parachutes.
Dec 30, 2009, 09:54 PM
Checking the wind
kansascloud's Avatar
Thread OP
Yep, KF step at 50%.
Dec 30, 2009, 10:01 PM
Vertical approach specialist
potshot's Avatar
What size are the squares on that PrestoSim tablet? Did you trace the wing crutches directly on it?


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