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Dec 17, 2014, 05:27 AM
Tony Audsley Retired Locksmith
Lockey's Avatar
Build Log

Depron Saab Viggen


Any interest in this one? ... 700 mm wing span ... EDF or Pusher ?

NOT SCALE ... Stand off (way off) Scale-ish ... with a bit of shape

Plans are now available at: http://www.lockeysrcplans.com

Lockey
Last edited by Lockey; Dec 04, 2016 at 07:34 AM.
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Dec 17, 2014, 07:05 AM
Tony Audsley Retired Locksmith
Lockey's Avatar
I've read in a couple of places that the canards are at 10 degree positive incidence ... this seems a lot, can anyone confirm this ?

Lockey
Last edited by Lockey; Dec 17, 2014 at 07:23 AM.
Dec 17, 2014, 07:17 AM
Retired CAD guy
birdofplay's Avatar
Personally I did a Bercut Mig and left things at Zero and just though of it as a Delta.

With two more servos I did manage to get the Canards articulated,
and mixed so that they were both elevator and ailerons.
Dec 17, 2014, 07:27 AM
Tony Audsley Retired Locksmith
Lockey's Avatar
Quote:
Originally Posted by birdofplay View Post
Personally I did a Bercut Mig and left things at Zero and just though of it as a Delta.

With two more servos I did manage to get the Canards articulated,
and mixed so that they were both elevator and ailerons.
Pretty sure the Viggen ones were fixed Bob with just flaps at the back of them

Lockey
Dec 17, 2014, 07:43 AM
gpw
gpw
“There’s no place like Foam”
gpw's Avatar
In the model world , giving the canard a bit of positive angular difference would do much to tame the famous Delta stall (nose straight down) ... Our magic # for canards is +5 degrees.. just sayin’ ...
Dec 17, 2014, 08:44 AM
Tony Audsley Retired Locksmith
Lockey's Avatar
Quote:
Originally Posted by gpw View Post
In the model world , giving the canard a bit of positive angular difference would do much to tame the famous Delta stall (nose straight down) ... Our magic # for canards is +5 degrees.. just sayin’ ...
Thanks GWP, 5 degrees sound good to me

Lockey
Dec 17, 2014, 09:39 AM
gpw
gpw
“There’s no place like Foam”
gpw's Avatar
Lockey, you might try making some small foam profile “chuck gliders” to confirm your angular preference and CG location... More positive difference and the CG moves forward a bit ... Once trimmed , the stall should be what used to be called "stair step stall recovery ” , where instead of the nose dropping straight down (most deltas) , the nose merely bobs up and down a bit whilst the plane floats down at a very steep angle ... much more manageable , you can drop a canard in right at your feet from a great height (pancake landing ) ... Fun stuff !!!
Dec 17, 2014, 10:30 AM
Mike's Ma Maaaaaaaaan
Just measured my Grippen built from plans on here (by Steve), flies a treat with elevons at neutral and + 6 on the canard. I have may canard switched so I could switch it on or off to get her trimmed out.

Paul
Dec 17, 2014, 12:40 PM
skumgummi dave
Go for it Lockey. I think it looks pretty cool!

Dave-
Dec 17, 2014, 09:49 PM
Hot glue held together by foam
balsa or carbon's Avatar
Quote:
Originally Posted by Lockey View Post
I've read in a couple of places that the canards are at 10 degree positive incidence ... this seems a lot, can anyone confirm this ?

Lockey
That's what they used on the FliteTest Viggen , same effect and purpose as reflex on a delta without canards .

http://flitetest.com/articles/ft-viggen
Dec 18, 2014, 07:51 AM
gpw
gpw
“There’s no place like Foam”
gpw's Avatar
Looks like the Flight Test boys have their version well sorted eh !!! ...

Seems they have the canard fixed to provide a good stall recovery ... but ( IMHO ) a working canard is much more versatile. Just call it “nose vectoring” ...
Last edited by gpw; Dec 18, 2014 at 07:56 AM.
Dec 18, 2014, 08:43 AM
Tony Audsley Retired Locksmith
Lockey's Avatar
Yes the FT version sure seems to fly well ... bit on the square side though unless you want to build the blue foam hot wire version

You know me guys, I like to something with a bit of shape

Lockey
Dec 18, 2014, 08:48 AM
gpw
gpw
“There’s no place like Foam”
gpw's Avatar
Lockey, the builder in the film said it was 20 hours to cut out the hot wire version , which we think looks a little Better ... Those could be 20 enjoyable hours eh ? Spending time !!! ...
Dec 18, 2014, 09:15 AM
Tony Audsley Retired Locksmith
Lockey's Avatar
Quote:
Originally Posted by gpw View Post
Lockey, the builder in the film said it was 20 hours to cut out the hot wire version , which we think looks a little Better ... Those could be 20 enjoyable hours eh ? Spending time !!! ...
Too much for me mate ... booooring zzzzzz ... rather be building

Lockey
Dec 18, 2014, 11:21 AM
Warbirds Lover
Dreamcatcher's Avatar
Hi lockey,

You can have a look on the Viggen plans from Pukin-Dog here on RcGroups / pusherprops section :
https://www.rcgroups.com/forums/show...ghlight=viggen

The Flite test staff guys also have designed some viggen :
http://flitetest.com/articles/ft-viggen

Hope this can help to find the answer to your questions

I will follow this thread with interest

Kind regards

Pascal


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