Jim_Purcha

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Here is a link to Jim Kirkland's A6 Intruder. I had these plans scanned a couple of months ago.

JPBIII

What are the specs on this A6 Intruder? wing span etc...
How is this different than the World Models A6.
Looks like a nice plane.

hallstro

Jim:

Thanks for your time and efforts. This looks like a good one.

Dave

Jim_Purcha

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This is the original design:62-1/4" wingspan, 654 sq. inches, Length 51-3/8", 5-3/4 to 7 lbs.

jeide

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Hi Jim. Thanks for the plans. Can these be sent to a print shop like Kinkos to reproduce a full size plan?

rainedave

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I've always wondered why World Models chose Kirkland's Intruder to base their arf on. Don't get me wrong, I think it was a fine choice, but it's never been clear to me why they settled on this particular design.

David

Jim_Purcha

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You can try. I haven't done this yet, (I should try on the plotter at work). I've tried a section on the pc at home on 8.5X11 and it appears to measure correctly for the spinner and front wheel with my metal ruler.

Good Luck.

Jim

kr9x

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Hay Jim...

I just finished re-inking my copy of the A-6!! Yours looks to be in "like new" condition! I am already starting to collect balsa for my build and the SPA summer season here in Florida.

Jon

rainedave

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Jim, the tif's look great! Thanks for making these available. Tracing these drawings into cad is a daunting task.

David

aerowoof

looks good thanks.I have a .40 size skyglass intruder kit been looking for a larger one was tempted with the wm a-6 90.Thanks

Jim_Purcha

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Good evening. I just added a pdf file of the original article from MANs. Large download at 5MB. [link=http://www.4shared.com/file/61901625/e8805c54/A6_Indtruder_Article.html]A6 Intruder Article Pdf File[/link]

Jim_Purcha

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Other note. The first post shows the smaller images as what is available on the posted link. The files on the poste link were scanned at a local blueprint shop.

Jim_Purcha

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Here is an updated link to the scanned files.

[link=http://www.4shared.com/file/35537507/9f582ea3/A6-Intruder_0001.html]A6-Intruder_0001.tif[/link]
[link=http://www.4shared.com/file/35537547/fb34eba7/A6-Intruder_0002.html]A6-Intruder_002.tif[/link]
[link=http://www.4shared.com/file/35537574/4910e9de/A6-Intruder_0003.html]A6-Intruder_003.tif[/link]
[link=http://www.4shared.com/file/61901625/e8805c54/A6_Intruder_Article.html]A6_Intruder_Article.html[/link]

rainedave

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Thanks Jim.

David

Taurus Flyer

David (and gents) that’s a nice plane but?

Why that horizontal sheeted tail plane has a diamond shaped profile?
And that Wright Flyer fin?
It looks like a jet with Wright Flyer tailfeathers.

This plane is for shore not designed by Ed Kazmirski.
Or diamond shape and silk covered (1961 and older ) or sheeted with a good profile (1962 and younger).
Will the plane be SPA legal with a good profiled tail planes? At least it will fly better for the same investment costs because all you have to do is throw away less wood.

NACA 0009 smoothed, me seems to be a good choice! What do you think?
And if you already fly the plane?
I would remove the diamond shaped and modify the plane with a profiled one and would do that with that fin also.

Or do I say something wrong?

Cees

Jim_Purcha

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In the original article by Jim Kirkland he explained why his choice of a diamond shaped horizontal stabilizer was diamond shaped.

"Horizontal stabilizers have bugged me almost as much as wings have, and for almost as long! There is something about the stab's small size that just yells for inattention, especially after working on a wing! The natural tendency is to build it flat and get it over with! Howwever, after many hours of flight evaluation it became obvious that a flat stab just couldn't measure up to a symetrical section. About all that I can say today about a flat stab is that it is adequate for horsing around. ........

The diamond stab has better flight characteristics than any previous airfoil stab I have used in the past! I do not know why, but the diamond stab seems to make a pronounced difference in the way the Trition and Intruder handle just before landing touchdown. It is as if the stab helps tremendously in holding the model off until the last instant, and then holds it just a little longer! The phenomenon must be experienced to be fully appreciated. In flight, while performing various maneuvers, I can tell no difference between this stab and a symetrical airfoiled section of the same thickness and with the same leading edge shape."

He also claims there was no intention here to claim originality in the use of a diamond stab on the Trition and the Ed Kazmirski used a diamond section on the Taurus.

I can't make a comment on the difference, as I have never built the plane or flown it. I would like too. A lot of these older designs were eye catching and suppose to be great flyers. I used to see koas's, mach 1 and other pattern planes at the local club field when I was younger.

rainedave

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Although I've never tried it, I have read more than once that the diamond airfoil softens the elevator. Basically, it was supposed to function like having a little bit of Expo, before the days when radios had this feature. But, it's important to emphasize that I read this somewhere and it might not be true.

David

Taurus Flyer

Jim,

Sometimes I do start a discussion to hear others ideas about the differences in our airplanes and thank you for explain.

My opinion is that the incidence of a airstream on an profiled stab can be a little worse than a diamond shape and still working.
Best of all is what we in the Netherlands call the �pendel� elevator, all moving stab?

The same thing we can think about the ratio stab versus elevator, the bigger the elevator the less problems with the stall speed of the stab until you also in this explanation reach the limit, 100 % elevator so “pendel� elevator, or all moving stab again the winner.
The difference between a profiled and diamond will not be much I think, but when we look at the low speed and at touchdown, it think the profiled is the winner.
Sometimes it is good to look at the gliders.

About the fin, as like a non-profiled stab.

The corner of an incoming airstream more than 8 degrees from the centre line, I think it is over with this fin. Diamond will be better and profiled the winner. So in all low speed maneuvers and problem situations maybe a good fin is a profit.
Question, was the A6 also designed for the ‘knife edge’ maneuver?

I can explain it all as all the profiled planes have a balance of forces up and down. (Fin left and right).
Any curved surface, so also the top- and bottomsurface of the profiled/diamond stab, generate a underpressure, (Bernouilly) in an airstream.
The balance of these two forces changes with the incoming corner of the airflow.
No profiled result in, no underpressures in a central airstream with central elevator (and oké CG!), so no balance of forces in the neutral situation, result is hysteresis and sometimes waggling of the tail, up/down, left/right.
And that is what they mean Rainedave, like a little expo, profiled
And less stablility in the neutral situation, adequate for horsing around, for the Non profiled.

Jim, my Midwest Sweet, a Jonny with profiled tailplanes.

Cees

salat

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Thank you Jim!

Atlanta 60

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Thanks Allot Jim..

Jim_Purcha

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No problem guys. Jon (Kr9x) had originaly sent me a photo copy of the second article on the A6 Intruder. I thought yesterday of taking these to work and scanning the originals on the printer as a pdf. I case I misplaced the photocopies. I figured, I might as well upload these to make available for other modelers too.

kr9x

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If you can't find them Jim, I still have mine. I also re-inked the plans so they are easier to read. These are the plans I sent to Lazer Works for the short kit they now offer, yes I have one. My problem with completing the kit right now is the Atlas on my building board!! I'm trying to get it done for the SPA contest in Miami in November.

Jon

Jim_Purcha

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I still have the photocopies Jon. I scanned them to a pdf to backup on my computer.

Jim

casniffer

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Thanks for the scans, Jim.

CAsniffer
[link=http://www.trentonrcflyers.com/pattern/pattern1.htm]Classic Pattern Image Base[/link]

Jim_Purcha

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A6 Intruder plans are on www.hippocketaeronautics.com

http://www.hippocketaeronautics.com/...45&mode=search

Laser cut short kit
http://store.laser-design-services.c...roducts_id=198