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Nov 21, 2011, 10:01 PM
Aircraft Designer Guy
AJWoods's Avatar
Discussion

SAAB Viggen


I got one of the Sky Angel 35mm BAE Hawks a couple of weeks ago. Took half a dozen flights or so to figure it out and get if flying consistently, then it met a chain-link fence

I've been messing around for a while on the laser cutter, trying to get panel line effects with minimal labor, so I drew up a SAAB Viggen as a test airframe. The foam is painted first, the panel lines are etched on one cutting pass on the laser, then the part outlines are cut. I've tried a bunch of different weathering techniques to add more contrast to the etches, but plain white still looks nice, particularly with some back light.

The jet with all the Hawk electronics and a 350 2 cell comes in at 65g, putting out a hair more than 70g thrust on a fresh pack. There is about 4x the wing area of the hawk, so hand launches should be a non event. Hope to try flying it tomorrow.

-Adam
Latest blog entry: Giant Scale Lego Plane
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Nov 22, 2011, 08:25 AM
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MIT KID,

Your Viggen is really nice. You should have no problems with this flying. High alpha should be awesome. Please post a vid.

Ksqm
Nov 24, 2011, 11:59 AM
Aircraft Designer Guy
AJWoods's Avatar
Got it flying this morning. Trimming took a while as I think the canard may be at a slight positive incidence. Flies awesome and lands at a crawl. I'll see if I can get somebody to shoot some video before the turkey comas set in

-Adam
Latest blog entry: Giant Scale Lego Plane
Nov 25, 2011, 10:09 AM
Aircraft Designer Guy
AJWoods's Avatar
35mm Micro Viggen (1 min 13 sec)
Latest blog entry: Giant Scale Lego Plane
Nov 25, 2011, 08:04 PM
Registered User
MIT Kid,

Nice vid. What are the specs on your Viggen. Looks to be about 13"-14" WS. Looks like a nice plane for a 25mm/27mm EDF unit I have.

Ksqm
Nov 25, 2011, 08:31 PM
Aircraft Designer Guy
AJWoods's Avatar
Thanks. It's just a hair under 14" span. The painted airframe without electronics was right around 28g. It flies with authority on the stock sky angel 2s setup, I'd imagine something on 3s would be very fun.

-Adam
Latest blog entry: Giant Scale Lego Plane
Nov 26, 2011, 01:16 AM
Team30 Micro EDF
NitroCharged's Avatar
Wow! what a floater.

That unbalanced fan was torture to listen to though.... LOL
Nov 26, 2011, 08:16 AM
Aircraft Designer Guy
AJWoods's Avatar
haha yeah. It sounded much better when it was in the hawk. I think without the support of the foam the shroud is resonating. When I first set it up, you could see the shroud hit a mode right around mid throttle. I worked on balancing the rotor, but it's still not right. When I try 3s, I'll pull the shroud out and wrap a layer of depron around it to try to move that frequency up along with balancing the 3 blade rotor better.

-Adam
Latest blog entry: Giant Scale Lego Plane
Apr 04, 2014, 12:59 PM
Registered User
Hi Adam!

Do you have the plans on the web for the mini viggen?
I would love to build one for my self.

/Jason
Apr 04, 2014, 02:30 PM
Do it Right, the first time!
CoolerByTheLake's Avatar
If you want to do a 50mm one, the plans are here:
https://www.rcgroups.com/forums/show....php?t=2004558
Apr 04, 2014, 02:36 PM
Registered User
Quote:
Originally Posted by CoolerByTheLake
If you want to do a 50mm one, the plans are here:
https://www.rcgroups.com/forums/show....php?t=2004558
:-) Thanks, but I all ready got that one on the workbench.

/Jason
Apr 05, 2014, 07:19 PM
Aircraft Designer Guy
AJWoods's Avatar
Never got around to posting plans for this one, because of all the engraving, but I might be able to put up a simplified version. It's based directly off a stock 3-view, so there's not much more to it than the outline.

-A
Latest blog entry: Giant Scale Lego Plane


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