SAAB Fighter

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staubkorb
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SAAB Fighter

Postby staubkorb » Thu Mar 07, 2019 7:29 pm

An aircraft that has long intrigued me is the SAAB J/A 21 pusher fighter that was further developed into Sweden's first jet fighter. I was aware that Pres Bruning had built a rubber powered version sometime around 2004 and wrote to him if a plan was available ( assumed it was his design). A few weeks later I received a letter with a tiled print of the hand drawn (sketched!) plan by none other than the late great Nate Sturman!

The scan was/is fair/good, but the penciled in notations were all but illegible and masked some critical areas of the drawing so I re-scanned and loaded the pages into my TurboCad 4 (!) and started to redraw and stitch the tiles together.

Fast forward to last month, I completed a rough drawing (going thru TC4, v8, then v12.5 and finally v21) to what I hope will work for a viable model. I'm presently cutting wood.
220px-J-21-Intro.jpg
220px-J-21-Intro.jpg (6.53 KiB) Viewed 607 times


Scale is 1/24th which translates to about a 19 inch span, assuming my scaling didn't go AWOL, makes a lot of the parts quite finicky. If it all works out, I'll probably go to 3/4" inch/foot scale for a span of 28 inches.
Attachments
300px-Saab_J_21A-3.jpg
300px-Saab_J_21A-3.jpg (18.53 KiB) Viewed 607 times
220px-SAABA21A-3Soderhamn.jpg
220px-SAABA21A-3Soderhamn.jpg (12.32 KiB) Viewed 607 times
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kittyfritters
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Re: SAAB Fighter

Postby kittyfritters » Fri Mar 08, 2019 12:14 am

Personally, I would go for 1:16 scale. It would be structurally less dense, have more wing area, a longer motor and likely be easier to trim. But, that's my view. It will be interesting watching how yours develops.

KF
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staubkorb
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Re: SAAB Fighter

Postby staubkorb » Sat Mar 09, 2019 3:18 pm

A fair idea, Howard! Bigger does generally fly better. 1:16 would put it at about 30 inches (I'm lousy at converting these scales even tho I studied aircraft design :oops: ).

I've started building the easy parts - stab and rudders - to let them fully "cure" as I've found that letting the flat gubbins age a bit helps reduce warpage (assuming the joints are square). Fairly slow going atm as I'm fighting a bad cold.
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staubkorb
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Re: SAAB Fighter

Postby staubkorb » Sun Mar 10, 2019 6:36 pm

Here are photos of the prelim plan that I'm using to check the buildability of this puppy.
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2019_03100049.jpg
2019_03100049.jpg (163.46 KiB) Viewed 534 times
2019_03100048.jpg
2019_03100048.jpg (152.55 KiB) Viewed 534 times
2019_03100047.jpg
2019_03100047.jpg (153.04 KiB) Viewed 534 times
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