Has anyone tried overhead projector sheet (Mylar?) for VG material?
I mounted them but have not flown with them yet, let me know if it is a bad idea.

They are very, very easy. You print the pattern on the sheet with your laser printer and cut them out with scissors.

I mounted one on my car hood to check out the aerodynamic flex and there was zero visible flex at 80 mph.

Once mounted, they are nearly invisible (accept for the shadow). Because they readily flex, they are more durable than the hard plastic I used before. They feel like feathers when you rub your hand accross them.

Coincidently I use an overhead projector pen to mark the ends of the VG positions on the canard. Just rinse with water and the marks wash away perfectly.

I would have tried out the new VGs, but the Post Office took three weeks to get my prop to the shop using Priority Mail. It arrived there today but the prop guru started his vacation today, and so it goes.

Happy flights,

Ed m

Ed
You have any idea how thick this Mylar is? How did you stick then on?
Larry

Hi Larry,

It is the standard overhead projector material. I would guess it is
about .003-.004" thick. I used 100% silicon caulk (clear,thick
stuff). To apply the caulk I used tweezers to hold the vg and drag
the base accross a fresh blob of caulk to get a 1/16" bead along the
base. Then place the VG on the mark. They are so light, there is no
tendency for them to fall over while the caulk sets. Apply in no
wind.

Cheers,

Ed m



--- In Q-LIST@..., "L Koutz" <koutzl@S...> wrote:

Ed
You have any idea how thick this Mylar is? How did you stick then

on?

Larry

----- Original Message -----
From: "Edward MacLeod" <ed@m...>
To: <q-LIST@...>
Sent: Monday, September 25, 2000 3:52 PM
Subject: [Q-LIST] easy VGs

Has anyone tried overhead projector sheet (Mylar?) for VG

material?

I mounted them but have not flown with them yet, let me know if

it is a

bad idea.

They are very, very easy. You print the pattern on the sheet

with your

laser printer and cut them out with scissors.

I mounted one on my car hood to check out the aerodynamic flex

and there

was zero visible flex at 80 mph.

Once mounted, they are nearly invisible (accept for the shadow).

Because

they readily flex, they are more durable than the hard plastic I

used

before. They feel like feathers when you rub your hand accross

them.

Coincidently I use an overhead projector pen to mark the ends of

the VG

positions on the canard. Just rinse with water and the marks wash

away

perfectly.

I would have tried out the new VGs, but the Post Office took

three weeks

to get my prop to the shop using Priority Mail. It arrived there

today but

the prop guru started his vacation today, and so it goes.

Happy flights,

Ed m









To unsubscribe from this group, send an email to:
Q-LIST-unsubscribe@...

Quickie Builders Association WEB site
http://web2.airmail.net/qba321tm/q-page1.html

Ed
There are a lot of variables with Vg's You have:
Size
Shape
Spacing
Angle to relative wind
Placement on Surface (were to place on wing)
Mounting method

and probably more I haven't thought about!!!

I will try to find some of that overhead projector material. Offhand I feel
it would be too flimsy and just bend over at high speed- but that might be a
good thing!

I went flying today with Vg's placed just in front of the elevator. These
Vg's are triangular 1" on base and 1/2" high. There was about 1 per inch in
pairs and a section about 12" long on the canard at the extreme outboard end
of the elevator. The Vg's did delay the elevator stall as shown by 3" thread
tufts along the elevator.

However at high speed the tufts were NOT laying flush with the elevator.
They were flying up about 10 -15 degrees above the surface. Go figure!

The testing will continue.

Larry

Hi Larry,

Keep up the good work.
(Open offer to anyone who will report on results) If you like, I
could mail you a pre-printed mylar sheet. It may be a hastle to buy
only one or two sheets locally. One sheet will do two planes.
If you want a custom shape printed, no problem. Let me know.

Ed m

--- In Q-LIST@..., "L Koutz" <koutzl@S...> wrote:

Ed
There are a lot of variables with Vg's You have:
Size
Shape
Spacing
Angle to relative wind
Placement on Surface (were to place on wing)
Mounting method

and probably more I haven't thought about!!!

I will try to find some of that overhead projector material.

Offhand I feel

it would be too flimsy and just bend over at high speed- but that

might be a

good thing!

I went flying today with Vg's placed just in front of the elevator.

These

Vg's are triangular 1" on base and 1/2" high. There was about 1 per

inch in

pairs and a section about 12" long on the canard at the extreme

outboard end

of the elevator. The Vg's did delay the elevator stall as shown by

3" thread

tufts along the elevator.

However at high speed the tufts were NOT laying flush with the

elevator.

They were flying up about 10 -15 degrees above the surface. Go

figure!

The testing will continue.

Larry



----- Original Message -----
From: "Ed MacLeod" <ed@m...>
To: <Q-LIST@...>
Sent: Tuesday, September 26, 2000 8:49 AM
Subject: [Q-LIST] Re: easy VGs

Hi Larry,

It is the standard overhead projector material. I would guess it

is

about .003-.004" thick. I used 100% silicon caulk (clear,thick
stuff). To apply the caulk I used tweezers to hold the vg and

drag

the base accross a fresh blob of caulk to get a 1/16" bead along

the

base. Then place the VG on the mark. They are so light, there is

no

tendency for them to fall over while the caulk sets. Apply in no
wind.

Cheers,

Ed m



--- In Q-LIST@..., "L Koutz" <koutzl@S...> wrote:

Ed
You have any idea how thick this Mylar is? How did you stick

then

on?

Larry

----- Original Message -----
From: "Edward MacLeod" <ed@m...>
To: <q-LIST@...>
Sent: Monday, September 25, 2000 3:52 PM
Subject: [Q-LIST] easy VGs

Has anyone tried overhead projector sheet (Mylar?) for VG

material?

I mounted them but have not flown with them yet, let me know

if

it is a

bad idea.

They are very, very easy. You print the pattern on the sheet

with your

laser printer and cut them out with scissors.

I mounted one on my car hood to check out the aerodynamic flex

and there

was zero visible flex at 80 mph.

Once mounted, they are nearly invisible (accept for the

shadow).

Because

they readily flex, they are more durable than the hard plastic I

used

before. They feel like feathers when you rub your hand accross

them.

Coincidently I use an overhead projector pen to mark the ends

of

the VG

positions on the canard. Just rinse with water and the marks

wash

away

perfectly.

I would have tried out the new VGs, but the Post Office took

three weeks

to get my prop to the shop using Priority Mail. It arrived

there

today but

the prop guru started his vacation today, and so it goes.

Happy flights,

Ed m