Liberty Sport

 

Liberty Sport - plan thumbnail image

Liberty Sport - completed model photo

Liberty Sport  
by Dick Graham
from Sig
1973 
57in span
Tags: IC R/C Biplane
formers unchecked


This plan was found online 10/11/2014 at: http://www.rcgroups.com/forums/showpost.php?p=29904935&postcount=550
Outerzone planID: oz6112 | Filesize: 1542KB | Format: • PDFbitmap | Credit*: Gerald, JPM

   

About this Plan

Liberty Sport - Radio control sport model for .45 to .60 engines. Kit # RC-33. Note this plan is missing plate 2, so this plan is incomplete.

Update 16/11/2014: Added supplement file inc (low res) page 2, thanks to JPM.

Supplementary files

Alternate version of the plan. This one is low res, but does have both pages.

Corrections?

Did we get something wrong with this plan? That happens sometimes. Help us make a correction

 

User comments

It is a pity that original sheet no 2 of plan is missing which covers horizontal tail plane and lower wing to 1:1. I have built Liberty Sport in 1984. It's still in flying condition and looks exactly like the plane in photo by Dick Graham. Sig plans were good and accurate to build. I fitted OS .60 4-stroke which was pretty adequate. The only actual modifications made was to give 1 deg negative incident for flat bottom of Clark Y aerofoiled top wing when fixed, to reduce total of 4 deg decalage of wings created by Clark Y aerofoils when bottoms were on horizontal level. Likewise to datum line to 3 deg and engine inclination down and right 1,5 deg. With original SIG set-up plane tends to jump up every time gas was implemented in the air. Landing of the plane was just a magnificent job to do with modified set-up. She was steady and calm and sit on 3 points. I used CG at point of 7 mm back from leading edge of lower wing which was about 25% point on MAC, calculated based on combined plan view of wings seen from above the wings and indicated by SIG. Lower wing is straight and few cm shorter than top wing and sits as shown on sheet no 1 "side view". It has couple degs of V. Wing N-struts are also angled outwards with some 15 deg. Ailerons only on lower wing. For 4-stroke .60 engine with carburetor behind installation, if I built plane today I would move firewall a bit backwards to give space for carburetor, its control and fuel lines. Top wing is horizontal with no V and swept backwards as shown. Center section which is at 90 deg to centerline of the fuselage is shown correctly in plan and covered by balsa sheets. Both wings have the same size of Clark Y aerofoil. I just wonder should I prepare sheet 2 to show lower wing and horizontal tail based on my plane built from SIG kit? Kind regards from Finland.
EinoRonkanen - 20/11/2017
The supplement file has a low resolution version of page 2. But if you can produce a drawing that has more detail, that would be great, thanks.
SteveWMD - 21/11/2017
Regarding my comment: I did modify aerofoil to be Clark Y. Aerofoils in drawings are modified Clark Y (tail lifted) to give less lift when at 0 deg incident.
EinoRonkanen - 01/12/2017
If someone wants to build Liberty Sport in larger scale than 1:6 it is practical to know wingspan of the top wing of 1:1 protype is 8.7m when scaling the sheets.
EinoRonkanen - 01/12/2017
Add a comment

 

Notes

* 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.

Scaling

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.

 

Terms of Use

© Outerzone, 2011-2017.

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.