RE: Scratch Building, Aircraft Design, 3D/CAD FAQ

RE: Scratch Building, Aircraft Design, 3D/CAD FAQ
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RE: Scratch Building, Aircraft Design, 3D/CAD FAQ - 1/5/2007 2:47:35 AM

Posts: 15
Joined: 12/13/2006
From: San Francisco, CA, USA
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I have a 3D model of the 300 built using Form-Z. Not totally accurate as it is also based on 3-views. However I can scan actual aircraft and you would have to email me concerning solutions.

Wendell

< Message edited by wendell5555 -- 1/5/2007 2:48:25 AM >

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RE: Scratch Building, Aircraft Design, 3D/CAD FAQ - 1/5/2007 4:54:07 PM

Posts: 1993
Joined: 7/17/2003
From: Greensburg, LA, USA
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sorry I can't help you too much, as I am not a computor person. my experience goes back to the 1930's. the good old days when we bought a kit for 10 cents and it was one a day as long as there was grass to cut or snow to shovel for the nieghbors. in addition to the rest of my carreer as an auotmotive and aircraft draftsman and engineer, pre computor, few years military and 4 years of college didn't help the model activity too much. suggest that you look at a lot of plans for sizes that they specify for the various wing sizes and types of planes. dick

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RE: Scratch Building, Aircraft Design, 3D/CAD FAQ - 1/15/2007 4:12:41 AM

jzak3

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Joined: 9/25/2005
From: germantown, WI, USA
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to whom it may concen: i am try to scratch build a b-25 mitchell and i have a freind of mine that has a cnc machine that would help me make the most important parts of this project the wing rib formers,i should tell you what kit it is. It is a royal products B-25 mitchell (maratuka),the thing that i need to know is what is the airfoil design?the wing is 70"wide if that helps ,i did some research on some sites and the real one has a S3012 air foil so i don't know if that would follow suit to the kit size.so if anyone can help me i would greatly appreciate it. you can e-mail me at jzak3@wi.rr.com thanx much.

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RE: Scratch Building, Aircraft Design, 3D/CAD FAQ - 1/29/2007 5:00:30 PM

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Joined: 1/29/2007
From: , PA, USA
Status: offline

Can anyone tell me how to determine the CG of a Delta Wing aircraft. I am building an F-18 with twin Fan Ducts made from Foam. It is 4 'Long and the wing span is 3 ' wide. Is there a formula for deterimining the CG for a delta wing aircraft and can someone let me know how to calculate the CG. Also I have strakes on the aircraft are they also included in the calculations. My E-Mail address is jwspilot4@hotmail.com

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RE: Scratch Building, Aircraft Design, 3D/CAD FAQ - 2/4/2007 8:54:27 PM

wisher

Posts: 13
Joined: 10/13/2004
From: Devils Lake, ND, USA
Status: offline

Hey guys, looking for some help.I tried to put a 22cc gasser on the front of a telemaster, couldn't get it to balance- even shortened the nose - no help.So I put a .75 on the front and called it good.
Still want to build a gasser, this time I want a pattern plane.going to use the same incidences as a sig cobra because I like the way the plane flies. Any advice on the wing span and total weight? I would like to go with a tapered wing{I think they look better} Or am I expecting to much from a converted engine?

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RE: Scratch Building, Aircraft Design, 3D/CAD FAQ - 4/15/2007 8:56:31 PM

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Joined: 4/15/2007
From: , NY, USA
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I should add that you can get a free copy of autodesk inventor if you are a student from autodesk.com

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RE: Scratch Building, Aircraft Design, 3D/CAD FAQ - 6/7/2007 10:42:04 PM

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Joined: 11/13/2006
From: Bangkok, THAILAND
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Hi Starwoes,

I worked on F-14A s while in the Navy in the early 80's. (VF-1 Wolfpack stationed at Miramar) Primarily electrical systems which affect all aspects of the aircraft. The Tomcats flaps are fowler flaps. The inboard flaps roll down small tracks when extended. There is a small panel running the length of the wing, hinged on the wing surface, that then drops down to cover the gap between the wing structure and the extended flap. This "door" was controllable from a thumb-wheel on the joystick. This system was used on landing approach to dump lift enabling the pilot to maintain glide slope. The pilot would roll the thumb-wheel and the doors sealing the gap between wing and flap would open proportionally. Air from under the wing would then flow up through the gap made by the door and join the air stream over the flap and the aircraft would descend. Keep in mind landings are made with a high AOA.

The outboard flaps were hinged at the trailing edge of the wing and would be deployed in flight as "Maneuvering Flaps". The Tomcat had no conventional ailerons. Roll control was through spoilers and use of the stabilators. (Stabilizer/elevators). In my opinion, for a model, stabilators should work just fine.

Craig.

(in reply to starwoes)

RE: Scratch Building, Aircraft Design, 3D/CAD FAQ - 10/6/2007 4:16:58 AM

1Way

Posts: 75
Joined: 3/28/2004
From: Bristol, IN, USA
Status: offline

I hope I didn't miss something, but a predominant assumption seems to be that a single software program for going from concept to a functional 3D aircraft. Do we really need to have a separate software program for each of the following?
form design = CAD/MODELING
lift+propulsion surfaces = technical airfoil coefficient stuff
engine+control system = ?
aircraft flight handling characteristics = flight sim
graphics = paintshop pro, corel draw, etc.

The graphics area is understandably specialized, but what about the rest?

Is there a particularly good (RC-small aircraft sized) aircraft design program for
ease of use
moderate learning curve
functionally powerful yet user friendly

I'd like a program for designing new aircraft design. Seems like if you do a good job with flight modeling (wind/fluid dynamics), your most of the way there.

Man, it's been a long while since I've posted here. Good to be back. I can't hardly believe how fabulous these forums are slicked out!!! LOVE IT!

(in reply to Tomcat Tech)

RE: Scratch Building, Aircraft Design, 3D/CAD FAQ - 10/30/2007 3:10:44 AM

pfatz

Posts: 111
Joined: 8/5/2007
From: Mena, AR, USA
Status: offline

Hey Mike I tried your link and it would not go through. Any chance of a typo??

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RE: Scratch Building, Aircraft Design, 3D/CAD FAQ - 11/5/2007 12:53:41 AM

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From: tampa, FL, USA
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mike james new site is http://www.nextcraft.com great crafts there. made me get into cad and now im trying totake that into construction of an actual model.

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RE: Scratch Building, Aircraft Design, 3D/CAD FAQ - 11/9/2007 6:50:59 PM

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Joined: 1/25/2004
From: newportuk, UNITED KINGDOM
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Hey mazeetwazaad what cad package are you using?

Im trying to turn a sketch into a 3d model then hopefully from that into a real model, interested to see how other people are doing it.

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RE: Scratch Building, Aircraft Design, 3D/CAD FAQ - 11/14/2007 4:45:07 AM

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Joined: 4/17/2007
From: tampa, FL, USA
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The programs i used there were TurboCad 2d v14 and Gmax. Currently trying to learn ViaCad though. HIt a snag in the process and hopefully cad will ameliorate things

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RE: Scratch Building, Aircraft Design, 3D/CAD FAQ - 12/2/2007 12:24:49 AM

Mdhat

Posts: 112
Joined: 2/25/2007
From: Lockport, NY, USA
Status: offline

I have a question about working with balsa. I am triing to cover my wing ribs and making curses / bends how do you shape the wood. I thought of soaking it with water but figured balsa is so dry it would absorb and swell changing the thickness. What about heat? Or just slowly let it warp itself by tiing down with rubber bands or something?

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