ThunderAI-RCU

Some wing spars have been started W6,7 will need to be changed from the frise aileron design to a flap design, my misstake. Otherwise you get the idea.

ThunderAI-RCU

Here is a head on look at the fuz wiull the formers in place.

ThunderAI-RCU

With all this talk, I've moved from Paint Shop to Turbo Cad.. Seems alot like Autocad R13. So Learning should not be a problem. I've almost cought up to about 2 days of work. Need to make spars and formers still but everything else is cought up. Not such a hard program after all.

Tamecat

Didn't get a chance yet to read the whole post. I built a small version of the plane your building (or about to build) I was wondering if your plane is gonna be built up or fiberglass? Are the wings likewise built up or foam core? Just wondering because your drawing are right on. Makes me want to try also.

Tamecat

ThunderAI-RCU

The final cx had yet to be determined. I would like to sheet it with a thin layer of balsa 1/16 or so, and then cover it in fiberglass. That is probably what will happen once I get all the yuickie cad out of the way.

Tamecat

Should be a great flyer. I placed a 32 engine on it. The wing span was around 55 - 60 inches. Fuse was shorter than that. Wasn't enough power to get it off the ground at first. The second time, with wind, it flew for a few minutes before the wind died and once again not enough power to sustain flight. It was rock steady, a nice sunday flyer until it hit the only rock on the entire field. It was the Piper Malibu but I called it the Maliboo-boo. I said that i would build another one but bigger. I can't wait till you cut wood and show the inprogress pics.

ThunderAI-RCU

There all inprogress pics, but I look forward to cutting wood as well

ThunderAI-RCU

I wonder what it would look like with floats on?

ThunderAI-RCU

Here is the current flap design. All connections work and servo layout and linkages correct angles.

ThunderAI-RCU

Closeup image on the flap mechanicals

ThunderAI-RCU

Here are the somewhat completed aileron wing spars.

ThunderAI-RCU

Had some time to make the next two formers. F4 and F6. So far so good, rather time intensive to get the sizes and shapes correct though.


Have a look.

ThunderAI-RCU

Here are the formers forward of F6.

Notice the incorrect shape of Former F2. Will have to correct this in time. So far so good though. Looking nice and smooth.

Just very time consuiming converting 2D into plausable 3D shapes. Wish I had a 3D model of the aircraft, probably would make this a little easier. hehe

Johng

My Feedback: (4)

Why such a fat, symmetrical airfoil for the wing section? Or am I mistaken?

Also, any washout in those long skinny wings?

ThunderAI-RCU

Couln't tell you about the airfoil. According to Piper they use NACA0009, thius the fat airfoil. Not that I like it, probably will need to be changed, not a prime concern right now.

Washout will be built-in as well. The AOI is 2^, so expect at least that much negative at the wing tips. As washout works you know, its not really negative, but it is, so.... yeah... anyhooo.

I was looking at it today in 1:1 scale on my monitor and almost fell out of my chair at how large the fues really is. Man that had some serious girth.

Johng

My Feedback: (4)

I would bet the NACA 0009 was for the tail surfaces only. I'm gonna go look at my copy of Jane's Aircraft.

Johng

My Feedback: (4)

Hmm, Jane's doesn't lilst any airfoils for that airplane ( well, Malibu actually) but does list 'em for most light planes.

Johng

My Feedback: (4)

Doing a search on Piper Malibu - I find a description on the x-plane site that says the Malibu has a 23015 airfoil. That makes sense...

ThunderAI-RCU

Well it really has a NACA 2412 as an airfoil for the main wings, and 0009 for the stab and vertstab. The problems are many with this. Currently I'm trying to figure out why the 3view has the wings with a larger "width" then what the airfoil has. Even when taking into account the AOI of the wings it still is not correct.

So something is wrong with that 3view and the wing width. So, until I figure that problem out, I'm staying away from the wings.

I could dig up a graphic to show you what I am talkign about but perhaps later.

Johng

My Feedback: (4)

Which view do you think is off? THere is no "width" dimension commonly used , is it chord length, thickness, span - which are you trying to figure out?

ThunderAI-RCU

As somewhat promissed my problem witht eh NACA 2412 airfoil with the 3view drawings I have.

I can strech and shrink them I suppose but then they are not the correct airfoil are they?

That is some bad text, whoosh.

I think the message gets across anyway

ThunderAI-RCU

Not sure what view to trust. I'm currently using a front on view from Pipers site to use the wing thickness. But I have a 3view drawing that was avilable at the start of the thread, Both are too thick for the given airfoil.

Johng

My Feedback: (4)

Ok, I see what you are talking about. First, I wouldn't trust the thickness on the front view or the side view at all, really. When you find a line drawing, the line thickness itself is enough to cause considerable error in the thin profile of the airfoil. In percentage, the thickness of the line is large wrt the thickness of that airfoil, so error can be large.

I would just establish root and tip chord lengths and generate your wing according to the airfoil coordinates for those chord lengths.

Also, check out this page:

http://www.mindspring.com/~thayer5/f...neman/pmm.html

This guy built a free flight model of the Malibu and had some problems with the 3-view as well. You might want to contact him.


I have some other questions/suggestions for you. Your rib drawings - I dont see an allowance for either skin thickness or a leading edge. Also, youl want to make any lightening holes with rounded corners. Sharp corners are weak points where cracks develop. Round openings are easier to make too.

I also don't see skin thickness on the bulkheads drawings...

Johng

My Feedback: (4)

Oh, and I'm using TurboCad 9 now too, so if I can help that way, you could even send me files to look at if you want.

ThunderAI-RCU

Leading edge will be "installed" in the drawing later. Right now i wanted the basic shape down, then once I take a trip to the hobby store I'll see if a block or a already shaped leading edge will be best.

Good tip on the holes, will do that when I have to rebuid the wing ribs.

I guess I can rebuild the wing spars with just the cord in mind and let the thickness se****elf. Should nto be a large problem, just time to fix and remake. I'll have to remake the fuse formers then, but oh well thats what makes this fun.


That link he says. Well I am going to atest to how odd this fuse is, and how "complex" it is, but nothing i can't handle. What makles me a little pissed is that there are no good 3view drawings out there.

I inlarged a copy I found on some spanish site then used the front view from a graphic on the piper site and a side view from their build it section. All in all after all the resizing and s**t was done I had something I could draw to. And now the wing thickness is crap, grrrr.

Anywhoo, I'll restart on the wing ribs today and see how far I get, lots of stuff to do aroudn the house today.