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Old Jan 01, 2015, 04:41 PM
The dog ate my clearance
brokenspar's Avatar
Joined Jan 2004
1,175 Posts
Build Log
Carl Goldberg Shoestring for AMPLAN build-off

In the late 1950s Carl Goldberg offered several "dollar" kits of 18 to 28 inch free flight rubber designs. One of the prettier kits was the 18 inch Shoestring Racer. I built one in my misguided youth and recall it being a quick build (it's all-sheet), nice looking and a good flyer.

It's easy to replicate these designs, as Paul Bradley offers the patterns as free PDF downloads on his website:

http://www.parmodels.com/Plans/

My build will be a 1.5X enlargement to 27 inches, and converted to the usual RET electric mode. I'll be using the Lemon receiver and 6 gram servos. I started several weeks ago but was interrupted by work and am just now getting around to posting it.
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Last edited by brokenspar; Jan 03, 2015 at 11:31 AM.
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Old Jan 01, 2015, 04:57 PM
I like real wooden aeroplanes!
Sundancer's Avatar
South-west France
Joined Sep 2007
5,351 Posts
Love it bs, that is a real fun project. I have posted your entry.
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Old Jan 01, 2015, 04:59 PM
The dog ate my clearance
brokenspar's Avatar
Joined Jan 2004
1,175 Posts
Thanks, SD. It's not a serious build, but very enjoyable!
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Old Jan 02, 2015, 11:55 PM
Registered User
Canada, ON, Hamilton
Joined Oct 2005
2,950 Posts
Looking very good. Looks to be just slightly smaller than my Dakota (30"), which is also all sheet balsa.
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Old Jan 03, 2015, 02:55 PM
skumgummi dave
Gresham, OR.
Joined Mar 2004
2,023 Posts
Hi brokenspar:

Delighted to see you build this one. I also built one as a lad.

Dave-
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Old Jan 03, 2015, 04:27 PM
AndyKunz's Avatar
Illinois
Joined Sep 2001
27,016 Posts
I had one of those as a kid. Flew great. I've thought a few times that I'd like to build another. Maybe I'll do that.

Thanks for the inspiration!

Andy
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Old Jan 03, 2015, 04:45 PM
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owlsabie's Avatar
South Africa
Joined Feb 2009
3,007 Posts
That's so cute
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Old Jan 03, 2015, 05:50 PM
The dog ate my clearance
brokenspar's Avatar
Joined Jan 2004
1,175 Posts
Thanks, all.

Completed the radio installation, added some wheels and put on some color trim with Japanese tissue. Not sure how to tackle the canopy. For now, I'll try a vacuum formed piece, using a carved balsa plug. I haven't vacuum formed anything in years, so this should be an adventure.

Still need to add the airscoops, landing gear fairings and cowl. Total weight, including battery stands at 3 1/2 ounces.
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Old Jan 03, 2015, 06:14 PM
AndyKunz's Avatar
Illinois
Joined Sep 2001
27,016 Posts
Get some 2" battery heat shrink from the car section at the LHS. Full instructions here.

Andy
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Old Jan 03, 2015, 06:15 PM
AndyKunz's Avatar
Illinois
Joined Sep 2001
27,016 Posts
Hey, you can't cheat on the cylinder head cowls! Those are what make it special!

Andy
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Old Jan 03, 2015, 06:21 PM
The dog ate my clearance
brokenspar's Avatar
Joined Jan 2004
1,175 Posts
Quote:
Originally Posted by AndyKunz View Post
Hey, you can't cheat on the cylinder head cowls! Those are what make it special!

Andy
I'll definitely add the head cowls; I agree it wouldn't look right to leave 'em off.
Great idea with the heat shrink tubing. I'll give that a try.
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Old Jan 03, 2015, 07:55 PM
I'd rather be flying.....
JeffMac's Avatar
United States, IA, Story City
Joined Oct 2013
695 Posts
Very nice little bird ! I too ( as a kid ) built some of the Goldberg all sheet ones - spirit of st Louis and ranger 21 and 30....

Best Regards,

Jeff
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Old Jan 04, 2015, 01:50 PM
The dog ate my clearance
brokenspar's Avatar
Joined Jan 2004
1,175 Posts
Thanks, Jeff.

Made a pair of sheet balsa cheek cowls and added some color trim and the Shoestring logo with Paul Bradley's patterns. I'll tackle the canopy next.
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Old Jan 04, 2015, 02:56 PM
Registered User
Canada, ON, Hamilton
Joined Oct 2005
2,950 Posts
Looks great, and a lot of fun.
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Old Jan 04, 2015, 05:57 PM
The dog ate my clearance
brokenspar's Avatar
Joined Jan 2004
1,175 Posts
Thanks, John.

Added the wing graphics. Still working on the canopy mold. That's going slowly, with lots of filling and sanding.
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