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Old Jan 20, 2007, 12:43 PM
dougmontgomery's Avatar
Glendale,Az.
Joined Oct 2004
3,540 Posts
Idea
Per Dick Kline, Kline-Fogleman test

While speaking on several occasions to Dick Kline he said that I could actually gain more lift with the step on the top of the airfoil. being intrigued by The size of the nano glider, It just give me ideas to test the KF.

kline also referred me to a Mr. Dick Wood, that has done some wind tunnel testing with this airfoil and he has also offered me some additional advise.

I love foam and this give me a break from the Cumulonimbus wing I am building. This is instant gratification.

The thought behind this is to make a simple glider, and simply balance it to glide, with no step at all, purely a 3mm depron wing with one strip of CF.

Then I will cut the steps of the yellow templates out of 3mm depron, not proportioned at the tip, and double side sticky tape them on to see what I gain, documenting between each step. Starting at the Leading edge.

If anybody has any questions please comment.

Once I have achieved the best glide I will upsize it 3 to 5% and then add gear.

I am shooting for about 2 ounces with no gear balanced.

doug
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Last edited by dougmontgomery; Jan 20, 2007 at 12:49 PM.
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Old Jan 20, 2007, 03:13 PM
dougmontgomery's Avatar
Glendale,Az.
Joined Oct 2004
3,540 Posts
picture

ok, test planform weighs in at 1 ounce......


first video will not have a step installed
flat plate 3mm wing

Step configuration from leading edge

from leading edge
25%
37.5%
50%
62.5%
75%

doug, video of flat plat wing gliding next post
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Old Jan 20, 2007, 04:43 PM
dougmontgomery's Avatar
Glendale,Az.
Joined Oct 2004
3,540 Posts
test one video, No step, no gear, test glide

video here:
http://www.rcgroups.com/forums/showt...44#post6769213


more to come

steps are made,

time for attachment
doug
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Old Jan 20, 2007, 04:59 PM
dougmontgomery's Avatar
Glendale,Az.
Joined Oct 2004
3,540 Posts
the 5 steps cut

weight of wing and fuse with first step glued on leading edge and shaped.

1.1 ounces
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Old Jan 20, 2007, 05:12 PM
Registered User
Somerville, MA
Joined Aug 2002
511 Posts
Watching with interest...

Best,
Al.
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Old Jan 20, 2007, 06:03 PM
PWP!
ajroahkni's Avatar
USA, HI, Makawao
Joined Oct 2002
3,911 Posts
That's a beautiful planform for a test - also watching. . .
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Old Jan 20, 2007, 06:43 PM
dougmontgomery's Avatar
Glendale,Az.
Joined Oct 2004
3,540 Posts
test 2

Thanks guys, that is inspirational.

video here:
http://www.rcgroups.com/forums/showt...08#post6769773

auw so far is 1.2ounces.

I added a wing mount consisting of two pieces of 1/16th balsa sandwhiching the 2 balsa inserts for some screws to hold the wing on.

Videos are hard by yourself.

Gained 10-12 feet with first step, the next ones will be double sided tape attached., I might have to move to the front yard.

Doug
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Old Jan 20, 2007, 07:15 PM
semper ventosus
weather_man's Avatar
Sasebo, Japan
Joined Jun 2004
992 Posts
Wow, great job on the test glides.
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Old Jan 20, 2007, 07:21 PM
dougmontgomery's Avatar
Glendale,Az.
Joined Oct 2004
3,540 Posts
Misting the steps for Reference

Thanks WM-

Just lite mist painted the steps for reference, will post when paint dries

This is the paint code

Step one,Leading edge- Orange 25%

Step Two, Black 37.5%

Step three, Yellow 50%

Step four, Green 62.5 %

Step Five for thrust- Red 75%

Picture soon


Kind of ugly for testing,but the final flying version will have a single color paint scheme
Doug
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Last edited by dougmontgomery; Jan 20, 2007 at 07:58 PM. Reason: add picture
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Old Jan 20, 2007, 08:37 PM
semper ventosus
weather_man's Avatar
Sasebo, Japan
Joined Jun 2004
992 Posts
Sorry if it's a stupid question, but do the steps have to be sanded to blend?
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Old Jan 20, 2007, 08:46 PM
dougmontgomery's Avatar
Glendale,Az.
Joined Oct 2004
3,540 Posts
90 degree step

WM- no the rear step does not have to be sanded. My first KF airfoil I made I tapered the back of the step 45 degrees. Dick Kline told me that there is more lift produced with a 90 degree step to the wing.

Then he told me the wind tunnel resulted in even more lift if the step is on top.

I was worried about looks, aesthetically- but test glides are getting better with each step.


I did sand the leading edge to create less drag.

This drawing represents the steps as I am testing. The double sided tape seems to be holding well, I had the black step tonight added on and it went the full legth of my back yard to the brick.

More video when ther is sunlight.

Doug
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Last edited by dougmontgomery; Jan 20, 2007 at 09:06 PM. Reason: add drawing
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Old Jan 20, 2007, 10:26 PM
trying to kick the habit
United States, CA
Joined Mar 2006
1,397 Posts
Quote:
Originally Posted by alk509
Watching with interest...
Ditto. Guess I should have said that when I subscribed Very interesting Doug.
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Old Jan 20, 2007, 10:31 PM
trying to kick the habit
United States, CA
Joined Mar 2006
1,397 Posts
Quote:
Originally Posted by dougmontgomery
I was worried about looks, aesthetically- but test glides are getting better with each step.
Bite your tongue. To me, some of the "prettiest" things in the world are pretty darn ugly
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Old Jan 21, 2007, 01:23 AM
Registered User
United States, AZ, Arizona City
Joined Sep 2001
5,011 Posts
It's always fun to run tests, but wouldn't it be pretty simple to model the airfoil in Profili and see what the results may be?

But hat's off to you, for being motivated to do the tests.
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Old Jan 21, 2007, 03:36 AM
dougmontgomery's Avatar
Glendale,Az.
Joined Oct 2004
3,540 Posts
GaryO, I only have an old version of Profili. I wasn't aware you could make your own airfoil in Profili and test it.
By wanting to test this airfoil, it gave me my lightest glider yet, and pleasantly I believe with some good looks that I will be scaling up a little.
If I sit in front of this computer figuring out what would work and not work in a really nice program like Profili, I would of never been where I am at today with builds and new designs.

If somebody wants to do that test, I would love to hear how it works.

Thanks, Doug
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