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Old Dec 01, 2010, 03:21 AM
Stirring the pot
johannlochner's Avatar
Port Elizabeth South Africa
Joined Jun 2008
4,009 Posts
Build Log
....ALCHEMY..... To all you wizards out there!!

Alchemy

So, how do you make gold from "nothing"?
or rather...
How do I get her to look good and fly??


I have some ingredients at hand....

- Reno Racer type visuals
- PPS references
- Hi performance wing and flight requirements
- Bat Mobile
- Dutchy Dawg styling
- Elementary building skills
- Little or no understanding of technical mechanics of flight!
- Passion

This list may be expanded as we go along....
The intention is to see if I can add all the ingredients together,
Blend them....
And.....
Voilą!


So,
If there are any wizards out there,
That understand the art of Alchemy....
That may help this newb wizard,
Please add to my cauldron for a merry brew!

Oh..
She will be a slope plane!
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Old Dec 01, 2010, 03:39 AM
Stirring the pot
johannlochner's Avatar
Port Elizabeth South Africa
Joined Jun 2008
4,009 Posts
Here are some thoughts...
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Old Dec 01, 2010, 03:46 AM
Registered Loon
Blackrat's Avatar
Jeffreys Bay South Africa
Joined May 2006
1,298 Posts
looks nice ... but will it be F-A-S-T ?
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Old Dec 01, 2010, 04:03 AM
Stirring the pot
johannlochner's Avatar
Port Elizabeth South Africa
Joined Jun 2008
4,009 Posts
Quote:
Originally Posted by Blackrat View Post
looks nice ... but will it be F-A-S-T ?
Trust you to find this thread!

Fast....
Perhaps not, but I'll work on it!
Still honing my composite skills!
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Old Dec 01, 2010, 04:39 PM
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JosePain's Avatar
Fort Lauderdale
Joined Jan 2010
236 Posts
Nice design ..
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Old Dec 01, 2010, 04:44 PM
Twisted and Confused
flyonline's Avatar
Joined May 2003
4,296 Posts
Looks kinda like....

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Old Dec 01, 2010, 04:54 PM
Stirring the pot
johannlochner's Avatar
Port Elizabeth South Africa
Joined Jun 2008
4,009 Posts
[QUOTE=flyonline;16702574]Looks kinda like....
QUOTE]

Erm, hu. yes....
Item 5 of the above ingredients!!

Just love that thing!
And as DD will never send me a fuz....

She'll make a fun flier!
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Last edited by johannlochner; Dec 02, 2010 at 08:36 AM.
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Old Dec 01, 2010, 05:25 PM
Twisted and Confused
flyonline's Avatar
Joined May 2003
4,296 Posts
Quote:
Originally Posted by johannlochner View Post
Erm, hu. yes....
Item 5 of the above ingredients!!

Just love that thing!
And as DD will never send me a fuz....

She'll make a fun flier!
Erm, missed that

Making it a twisty possibly too?

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Old Dec 01, 2010, 05:27 PM
Twisted and Confused
flyonline's Avatar
Joined May 2003
4,296 Posts
Wing section? Span? Wingloading/AUW?

How are you planning on creating plans?

Steve
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Old Dec 02, 2010, 12:43 AM
Registered User
Fubar 123's Avatar
Whitchurch,Shropshire. UK
Joined Jul 2008
1,186 Posts
Have you got the plug done yet Johann ?

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Old Dec 02, 2010, 02:52 AM
Stirring the pot
johannlochner's Avatar
Port Elizabeth South Africa
Joined Jun 2008
4,009 Posts
Quote:
Originally Posted by flyonline View Post
Wing section? Span? Wingloading/AUW?

How are you planning on creating plans?

Steve
Hi Steve...
This is where my inadequacies show....
I have built planes of my own creation, only to find they fly like pigs!!!
sooo...
This is where you guys come in!!

But left to my own devices, I have to use reference to other planes I have built or know their characteristics of.

To a certain degree, I am working on the assumption that the fuz is only the mechanism of keeping the wings and tail feathers apart...
What is the golden rule in this regard????
There must be a proportion of measurement....


I may use an adapted "Jart" wing section (6062 @ 8%)
or the RG14...


As you can see there are more questions than answers!

Sooo, I'll just carry on pen shaping the fuz!

I still have to work on it a bit.....

At this stage Steve, it's just doodling, but I can put it in cad.
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Old Dec 02, 2010, 01:06 PM
Stirring the pot
johannlochner's Avatar
Port Elizabeth South Africa
Joined Jun 2008
4,009 Posts
Ok....
So I better stop looking at pretty pictures and get down to the nitty gritty!
How does it work?

For the 1st time, I find myself realizing that I don't really know much about putting it all together myself!
So in an attempt to set it all straight...
Dived into the research pages and......
Found some pointers:
( I did not realize you were so well versed Steve)

Quote"
1. Decide on basic parameters (span, AUW, wing loading, required performance - e.g. aerobat, DS etc)

2. On paper,design layout, size tail, fin etc using Plane Geometry

3. Select appropriate Cl, Re and air speeds for plane (e.g. landing, normal AUW, ballasted)
4. Choose a selection of foils that you think match required performance and compare with Profili

5. Choose top 2 or 3 performing airfoils matching required Cl and Re's
run design through XFLR5 with each of the foils

6. Match airfoil(s) that perform best across the span
build

7. Compute CG

fly......

Quote...." Flyonline"

I'll start at the beginning and work my way through!
(How difficult can it be!)

Thanks Steve!
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Old Dec 02, 2010, 01:29 PM
.....till the wind drops.
Sean Oelofse's Avatar
Port Elizabeth, South Africa
Joined Oct 2006
3,520 Posts
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Old Dec 02, 2010, 03:14 PM
Twisted and Confused
flyonline's Avatar
Joined May 2003
4,296 Posts
Quote:
Originally Posted by johannlochner View Post
Ok....
So I better stop looking at pretty pictures and get down to the nitty gritty!
How does it work?

For the 1st time, I find myself realizing that I don't really know much about putting it all together myself!
So in an attempt to set it all straight...
Dived into the research pages and......
Found some pointers:
( I did not realize you were so well versed Steve)

Quote"
1. Decide on basic parameters (span, AUW, wing loading, required performance - e.g. aerobat, DS etc)

2. On paper,design layout, size tail, fin etc using Plane Geometry

3. Select appropriate Cl, Re and air speeds for plane (e.g. landing, normal AUW, ballasted)
4. Choose a selection of foils that you think match required performance and compare with Profili

5. Choose top 2 or 3 performing airfoils matching required Cl and Re's
run design through XFLR5 with each of the foils

6. Match airfoil(s) that perform best across the span
build

7. Compute CG

fly......

Quote...." Flyonline"

I'll start at the beginning and work my way through!
(How difficult can it be!)

Thanks Steve!
Hehehe - Don't know that I'd say 'versed' more like stumbled through

Actually, the Plane Geometry program is a great deal for the $$, though now I would get the Link Geometry too. I found that by putting in some planes that you have already flown and know well, you can get some handle on the numbers and what they represent.

I also use XFLR as I find it easier to compare multiple airfoils quickly, but Profili will do exactly the same thing.

HAVE FUN!

Steve
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Old Dec 03, 2010, 11:14 AM
only easy day was yesterday
markktm's Avatar
USA, CA, Livermore
Joined Apr 2006
523 Posts
To passion add large measures of patience and persistence.

Also look up a thread by Nauga for more calcs.

If you haven't already, look up some of Dutchy's threads, he is willing to abandon huge amounts of work if it doesn't "look" right.

Regards,
Mark

Mark
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