Plane Design
09-20-2007, 09:29 PM
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Plane Design
Hey all, I'm doing a little designing of my own and I'm currently trying to cut myself a profile yak foamy. I have already cut the wing and it has a cord of roughly 30". Is there a set "rule" if you will for the length of the fuse.
Any help would be greatly appreciated.
Thanks all!
Miah
Any help would be greatly appreciated.
Thanks all!
Miah
09-20-2007, 11:22 PM
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RE: Plane Design
Well, if you want to call it a Yak, try to make it look like one! Find a 3-view and take some measurements. You may have to play with the wing position to get it to balance. For 1/2a, that usually means the CG is set about 1/3 of the distance from the firewall to the back of the fuselage. For electric you can usually shift the battery around to get it to balance with a more scale appearance.
09-21-2007, 09:56 AM
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RE: Plane Design
And my Yak I mean "Yak-ish". I can't call it a Yak because I didn't design the Yak. Just trying for the 1st time coming up with my own drawing. Kind of doing it on the fly and tying to make it "Yak-is" 
I think I'm going to make the fuse roughly 30" long as well. I've seen some Yaks that the span and the fuse length are the same. See how that works.
I think I'm going to make the fuse roughly 30" long as well. I've seen some Yaks that the span and the fuse length are the same. See how that works.
09-21-2007, 11:42 AM
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RE: Plane Design
brocja, A long fuse like you are using is a safe bet. There are no set standards because each airplane is a little bit different. If you want to predict it's behavior take some area measurements of similar aircraft that behave the way you want. It's usually done in terms of % of wing area. IIRC, 20-25% is pretty standard for a horizontal and 10-15% for the rudder? The longer the tail moment, the smaller the % is needed to get the job done.
09-21-2007, 02:08 PM
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RE: Plane Design
Why would you say the 30" is alot for a foamy, I've been looking at alot of foamies on line and they all have like 34- 36 wingspans.
Maybe I'm using the wrong terminology, the span is 30"
Maybe I'm using the wrong terminology, the span is 30"
09-21-2007, 03:17 PM
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RE: Plane Design
[sm=lol.gif] I missed that. Chord is measured from leading edge to trailing edge. Span would be the correct term. When can we see some pictures? Even if it is (!?) electric.
09-23-2007, 07:14 PM
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RE: Plane Design
Hey all, sorry I didn't get the pictures out here yesturday. It was a long day. But I did get to work on the plane this morning, it isn't the prettiest, and I don't even know how it is going to fly, but, you don't learn unless you try.
09-23-2007, 08:33 PM
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RE: Plane Design
Looks pretty darn cool to me! Long tail moments usually work to your advantage in flight. I have to admit that I thought "texan" more than I thought "yak" when I saw the fuse.
09-24-2007, 01:51 PM
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RE: Plane Design
Howdie gents, It looks good . I would be concerned with the fuse flexing in the rear. some of the flat liners have addresd that with a horizonal pice down the center of the fuse, It shure is fun desinging your own. HKBII.
10-24-2007, 09:46 PM
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RE: Plane Design
Looks nice, Are you going to reinforce the wing and fuse? You could use carbon fibre strips or tubes, and or wood or maybe a + fuselage cross section. I guess it will fly more sport pattern "ish" than 3D. Isn't it fun building your own idea? Wait until you see it fly!
10-25-2007, 08:07 AM
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RE: Plane Design
Sorry guys, been a very hectic month with the house, starting a new job.
I flew it, all of one time. The foam was tooo heavy and the I didn't have enough power to fly it ("well"). So, I dismantled it. No biggy, next time I'm going to get the correct type of foam, or go a bit smaller with the plane.
It was fun trying to figure everything out. One of these years, I might actually take a stab at designing my own, with plans and all. This one I just kind of guessed.
I flew it, all of one time.
The foam was tooo heavy and the I didn't have enough power to fly it ("well"). So, I dismantled it. No biggy, next time I'm going to get the correct type of foam, or go a bit smaller with the plane. It was fun trying to figure everything out. One of these years, I might actually take a stab at designing my own, with plans and all. This one I just kind of guessed.
10-25-2007, 08:24 PM
#17
RE: Plane Design
Brocja, there is a Higley book called Foaming Around, it has some good pointers and design guidelines. Dick Hanson of the Aerodynamics forum is a foamie guru. Dickeybird did a thread about a foamie Bearcat a couple of years ago here that turned out awesome. Don't give up, just learn from your early attempts.
