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Conference vmszoo::rc

Title:	Welcome To The Radio Control Conference
Notice:	dir's in 11, who's who in 4, sales in 6, auctions 19
Moderator:	VMSSG::FRIEDRICHS

Created:	Tue Jan 13 1987
Last Modified:	Thu Jun 05 1997
Last Successful Update:	Fri Jun 06 1997
Number of topics:	1706
Total number of notes:	27193

965.0. "PLANS ENLARGEMENT" by BEMIS::SYSTEM () Fri Apr 14 1989 15:52

Hi all you scale experts.

	I want to build a WACO SRE from a set of plans I found in an old
copy of M.A.N. The plans are for an .049 engine and I want to enlarge the 
plans to use my .60 engine. My question is how do I do it? I have many, many
questions, such as:

1. How much do I increase the wing span by?
2. How much longer do I make the fuse?
3. How much do I increase the size of the balsa and/or the ply?
4. How heavy should my new "BABY" be? (I am in love with ALL WACO'S)
5. Do I just increase everything by a set formula?
6. If I do , what is the formula?

Any and all help is greatly appreciated as I have only built two planes so far.
My first plane was a BRIDE Krafty 60. This plane went together real easy,
but since it was my first plane and the instruction booklet, (that's right
it looked like a booklet) was of V E R Y  P O O R quality it took a long
time to build. My second plane was a Goldberg Anniversary Cub. Now this had a 
real nice instruction manual. Almost nothing was left to the imagination.
I now want to try to build the WACO but I don't know how to increase the plans.


	Thanks for the expected help. 
		After all R.C.ers stick together,right?



			Ray Grossman

T.R	Title	User	Personal Name	Date	Lines
965.1	note reference to help you	SRATGA::HUFF_DO		`Tue May 16 1989 19:09`	8
	Some of the information you seek is contained in note 43.0, the use of math (a formaula) to scale all dimensions to whatever you need or decide upon. It works. All you have to do is decide what wing area or span you want and the math takes you from there. I have seen this information before and it does work. The author is John Tavares and his bried bio is at note 4.3 good luck
965.2	more info	SRATGA::HUFF_DO		`Tue May 16 1989 19:12`	3
	There is also a plans service advertised in all the classified sections of the model mags that digitalizes any size plan and reproduces it to any size you desire. It is located in POWAY, Ca.
965.3	what about the profile?	VNABRW::SCHIMMEL		`Fri May 19 1989 06:31`	4
	I'm trying to to the same, but I have concerns about simple enlargement of the profile of the wings; does anybody have experience or knowledge? harry
965.4	huh?	CLOSUS::TAVARES	John -- Stay low, keep moving	`Fri May 19 1989 13:34`	2
	Harry, I've done a bit of changing plans around, but I don't understand your question. Could you re-state it, please?
965.5	my bad english ...	VNABRW::SCHIMMEL		`Mon May 22 1989 06:31`	13
	ok, if you want to enlarge a plan, let's say by 2 - double length, wingspan, ... you need a profile with double depth, and it would become double thick does such a wing work propperly, or do you choose another profile-type to get similar flying-characteristics with the enlarged plane I read a note about problems, scaling down plans (instability, ...) some profiles need a certain weight-load to provide good results (I mean: some planes don't fly better, decreasing their weight) harry
965.6	Use the Xerox Method	CLOSUS::TAVARES	John -- Stay low, keep moving	`Mon May 22 1989 11:03`	8
	For the wing, I generally have the airfoil in my files -- usually a clark Y or similar since I'm not ready for the fancier ones yet. I simply blow up the foil on the xerox until it is the right chord, the height of the airfoil changes proprotionally and I've never questioned it. Might add though, I usually change scaling by considerably less than 2.