Sinbad 40 (oz3869)
About this Plan
Sinbad 40. Towline glider model. Sig kit FF-3.
Supplementary file notes
Planfile includes kit sintrcutions, compelte.
Did we get something wrong with these details about this plan (especially the datafile)?
That happens sometimes. You can help us fix it.
Add a correction
from Sig (ref:FF-3)
Glider F/F Kit
all formers complete :)
Found online 08/01/2013 at:
Format: • PDFbitmap
Credit*: Ka-6BR, guiseppi, lincoln
Do you have a photo you'd like to submit for this page? Then email email@example.com
User commentsThis was originally a Berkeley kit. The AMA plans listing says it's from 1945.
For me, anyway, this is a challenging build. In the kit I'm using, from Sig, R-2 and R-3 didn't seem to be anywhere. However, there was an unmarked sheet of wood. The die cutting wasn't noticeable at first, but there was a single piece to substitute for R-2 and R-3.
It may be a good idea to put diagonal bracing in the crutch. At some point the crutch on mine developed a slight bend.
The top view shows wing sheeting, but the ribs aren't cut for it. It would probably be just fine with no sheeting, though in that case I'd suggest hard balsa for the top spar. I will probably cut my own ribs.
I may have more suggestions later.
Lincoln - 01/01/2021
I built a Sinbad 40 about 1958 or so, took a lot of my paper route money to get it finished. I admit I didn't do a very good job on the crappy Berkeley kit, my first try at using silkspan. I followed the directions for covering, didn't do very well, later I found out using wet silkspan worked a lot better. I didn't understand about clear dope, and so my Sinbad received just one coat of green dope, on sale at Scarborough Drugs in the "non fuel proof" bin. During the coupla weeks it took me to assemble the kit, I was yelled at by teachers as I daydreamed about my Sinbad's flight future. Actual performance was somewhat lacking. It did glide very well from a hand toss, once I got the C/G in place. With help from my younger brother, I attempted the recommended towline launch. You were supposed to adjust rudder trim for a gentle left turn, and then attach the sub fin with opposite rudder to make it tow straight, never worked right for me. Looking at the plans today, I realize the towline was attached waaaay too far forward for a stable tow, which caused my Sinbad to weave back and forth as I ran forward, following a rare smooth launch from my brother's hand. I could make it fly today with radio and an adjustable hook just forward of the C/G, all a great mystery back then. My only success at that time was an old fishing reel strapped to a foot of bamboo, useful in future more flight worthy gliders.
doug smith - 01/01/2021
Add a comment
* Credit field
The Credit field in the Outerzone database is designed to recognise and credit the hard work done in scanning and digitally cleaning these vintage and old timer model aircraft plans to get them into a usable format. Currently, it is also used to credit people simply for uploading the plan to a forum on the internet. Which is not quite the same thing. This will change soon. Probably.
This model plan (like all plans on Outerzone) is supposedly scaled correctly and supposedly will print out nicely at the right size. But that doesn't always happen. If you are about to start building a model plane using this free plan, you are strongly advised to check the scaling very, very carefully before cutting any balsa wood.
© Outerzone, 2011-2024.
All content is free to download for personal use.
For non-personal use and/or publication: plans, photos, excerpts, links etc may be used, provided that full and clear credit is given to Outerzone with appropriate and specific direction to the original content i.e. a direct hyperlink back to the Outerzone source page.
Unauthorized use and/or duplication of this material without express and written permission from this site's owner is strictly prohibited. If we discover that content is being stolen, we will consider filing a formal DMCA notice.