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Old Jan 01, 2007, 11:18 AM
JAM
MaxAmps CMO
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Nine Mile Falls, WA
Joined Jun 2004
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It will be a while yet need more foam and need to finish mt "big P-40 " first. I'll have to figure out a good airfoil to use on the wing also.

Jason
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Old Jan 04, 2007, 12:53 PM
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richard boyd's Avatar
Northern Ireland
Joined May 2006
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Soundman,fantastic plane +plan ! You could be responsable for alot of desperate house wives,as all the men will be in the workshops building your plane . Many thanks for sharing it with us .
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Old Jan 04, 2007, 03:54 PM
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United States, IN, Indianapolis
Joined Dec 2005
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OK, seriously - what AM I doing wrong ???

I cannot Download those plans whatsoever ???
I'm going nuts here :-(

Whether I simply try to open them or
Copy then into a directory and try to open them I get ERRORS !
Online it simlpy says there are errors opening this page.
In my directory it says it cant decrypt the file !

And this happens with BOTh the Plans aswell as the build guide.

I've never had probs with pdf stuff her ein the RCG forums.

Have I got a virus or something ???
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Old Jan 05, 2007, 01:27 AM
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Norfolk, UK
Joined Jul 2002
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I think you must have some sort of issue at your end - there is no reason why there should be any problem at all....maybe it's a browser/system version problem?
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Old Jan 05, 2007, 07:31 AM
gpw
“There’s no place like Foam”
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United States, LA, New Orleans
Joined Jul 2002
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Jam , you got a new job .... again ???
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Old Jan 05, 2007, 01:23 PM
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United States, IN, Indianapolis
Joined Dec 2005
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So I got to Pusher Prop Jets forum JUST FOR A TEST.

I try opening several PDF's ...

No problem with ANY of them !

I have discovered that even tho I have acro 5.0 but it WILL LNOT allow itself to be ASSOCIATED !?!?!
So my browser is using the older acro 4.0 which wont work with the file.


I HAD TO Control Panel REMOVE Acro 4.0 ...
"The expensive one that was paid for " To get the latest 5.0 to work .

Still it only works with IE7
my poor Mozilla is clueless even though I Changed the
Helper App to the new Acro 5.0

I've never liked Acrobat or Adobe !
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Old Jan 05, 2007, 05:56 PM
Planes are cool ;)
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Bath, UK
Joined Dec 2006
756 Posts
Looks great! Can I ask you how you came up with the dimensions for the cockpit/top fuse? I'm working on a similar project (a park flier, not a 3D pattern ship, but similar fuse) and I'm having a problem with converting a flat sheet of EPP to a skin which perfectly fits the fuse formers... any tips?

Cheers
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Old Jan 06, 2007, 12:06 AM
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Rhino3d has a feature that UNROLLS a bent forms to a flat one !!!

It doesnt always work but its been neat to play with for me.
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Old Jan 06, 2007, 05:37 AM
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Norfolk, UK
Joined Jul 2002
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I design all my planes in Adobe Illustrator (similar to Corel Draw) in only 2D. I have used some 3D software but find the unrolling a little unreliable, also I find designing in 2D much faster - particularly with Illustrator as I use it quite a lot.

This stage of working out the fuselage skin should be the last thing you do to the design before printing - everything else should be finished & finalised at this point.

The easiest way to work this out is if the fuselage top profile is a semi circle - then its a case of simple maths. Start off by drawing out the top & side views of your plane as you would normally do, draw out the formers that you want - from this you need to know the former width & height, then use this formula:

((Pi * width)/4) - (width/2) = extra foam allowance

Height + extra foam allowance = total fuz skin height at that former point

Do this at a few key points along the fuselage length & join the dots....straight sections just need straight lines joining them - curved parts like the canopy need the curve moving to the new position - the curve will appear slightly different, but when cut & glued up it should appear as it did in your original side view.

Broken down this means:
Pi * width = circumference of circle with the diameter of the fuselage width.

Divide this by 4 to give the length of a quarter of this circle.

Subtract width/2 (radius), this length is already included on your side view drawing, giving us the extra amount of foam needed to be added.

Add the height to the extra allowance & you now know the full height of the fuz skin needed at that point.

This works perfectly every time - I'm working on another plane now & have done it using this method again.

Below I have given a link to the excell file that I use, you just need to enter the width & height of the fuz/former & it will tell you the full dimension. As a bonus I have left all the other calculators on the spreadsheet that I use when designing a plane - the weight setup, wing area, wing loading etc is all saved with the Silent Mite info entered.....I find this excell file very useful when designing a plane & it saves lots of time & effort guessing, trying to predict weights etc

Plane Calc Excell File

I hope that answered some of your questions.....I'll deal with non-circular fuselage shapes later & let you digest this first.

Tom
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Old Jan 06, 2007, 08:15 AM
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Niagara Falls/Toronto area
Joined Dec 2003
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Tom: Thanx for that calculator. I'm one of those folks who uses the pencil and paper (and eraser ) to do my design work - I haven't figured out these new-fangled computer thingies yet. Learning how to unroll shapes is my aim though - whether it's new school or old school. Any info on how to do this is always appreciated!

Brad
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Old Jan 06, 2007, 09:16 AM
Crash Master
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Indianapolis, IN
Joined Sep 2001
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Math hurts my head That's what I have this PITA 'puter for!

I can't draw a straight line on graph paper, much less a perfect arc...

That's why I use CAD, xacto, razor blades and sandpaper! TLAR on CAD, trim and sand to fit.

My hat is off to anyone who takes the time and effort to pre-calc all these 3D fits. I can't focus on a detail like that long enough to stay awake
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Old Jan 06, 2007, 04:17 PM
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kimhey's Avatar
nøtterøy, NORWAY
Joined Mar 2006
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Hi again Soundman..

Have just downloaded it all from your page....

Again THANK YOU for sharing this with us all. You have probably spent quite some time on this, so remember.... your work is greatly appreciated.

Kim
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Old Jan 06, 2007, 05:55 PM
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United States, IN, Indianapolis
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Take it one more step Gene !!!

I cant CUT a straight line so I have CNC to cut my foamy parts !

I use Rhino3D for those UNrolling thangs but, I have to agree with soundman as
it doesnt always work.

Still the more time I'm on the Computer the less time I'm making scrap
out of good stock !
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Old Jan 07, 2007, 05:30 AM
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Norfolk, UK
Joined Jul 2002
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Quote:
Originally Posted by birdofplay
Still the more time I'm on the Computer the less time I'm making scrap
out of good stock !
Yep - & it literally takes 10 mins to do the needed alteration if you use the calculation on the spreadsheet.....perhaps 15 mins if you do it on a calculator - it's certainly not rocket science.
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Old Jan 11, 2007, 11:06 PM
Umm....Yeah....
Joined Jan 2007
9 Posts
I am going to build it. I am cutting out the templates now. Hey, does this plane have ailerons? They seem to be missing on my plans. Also, you do not specify on all parts what thickness they are to be made from. Can you clarify just a bit. I am using 3 and 6 MM depron. Oh, and about those forward fuz formers you mention in the guide. Don't see 'em either.
Thanks
great looking plane BTW
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