Serendipity (oz5854)

 

Serendipity (oz5854) by E Williams from RCMplans 1980 - plan thumbnail

About this Plan

Serendipity. RC sport sailplane.

Quote: "Webster defines serendipity as 'The faculty for finding agreeable things not sought for". Granted, an inanimate object of itself cannot find things. However, under the guidance of the pilot, many agreeable things nor necessarily sought for or expected may occur with this sailplane. Therefore, I have christened it Serendipity.

Following many enjoyable flights with Happy Face, my first design effort, it was only natural to want to improve on that design. Thoughts and ideas for Serendipity evolved as I observed flight characteristics of Happy Face and other sailplanes. With the announcement of the latest RCM design contest, it was time to put those ideas on paper, build and test fly a prototype.

Serendipity, like Happy Face, is designed for standard class competition. Certain design features of Happy Face have been retained, and new ones incorporated; the end result being where it counts, in improved performance. The wingspan has been increased to 98-1/2 in while retaining the 8 in chord and the modified NACA 4309 airfoil. The flight characteristics of this airfoil section have proved to be excellent.

Essentially the same moments have been retained but, due to the increased wing area, a slight increase in horizontal stab area is required. The fine positive pitch control response of the flying tail of Happy Face dictated no design change here. However, it will be noted that the control horn is internal to reduce drag.

Turn response has been improved by increasing rudder area and decreasing wing weight to decrease roll inertia. Greater airflow separation between the wing and horizontal stab is provided by the shoulder mounted wing. Wing turbulators, tiplets and plug-in attachment are all features which reduce drag.

Construction techniques are straightforward and should present no problem for the modeler ready to venture forth on his/her first scratch-built model. One unique construction technique is the method of assuring a perfect wing joiner rod wing-to-fuselage alignment. The wing joiner tubes are built into the wing during construction. The wing center section is then cut from the wing and incorporated into the fuselage.

Conventional materials are used in construction, balsa, spruce, plywood, epoxy, aliphatic glue, MonoKote and the normal hardware. Select materials carefully, build light and you will be rewarded with an excellent flying sailplane..."

Update 06/04/2015: Replaced this plan with a clearer version, thanks to theshadow.

Supplementary file notes

Article pages, text and pics.

Corrections?

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

Serendipity (oz5854) by E Williams from RCMplans 1980 - model pic

Datafile:

Do you have a photo you'd like to submit for this page? Then email admin@outerzone.co.uk

User comments

No comments yet for this plan. Got something to say about this one?
Add a comment

 

 
 

Download File(s):
  • Serendipity (oz5854)
  • Plan File Filesize: 792KB Filename: Serendipity-RCM-11-80_816_oz5854.pdf
  • Supplement Filesize: 1112KB Filename: Serendipity-RCM-11-80_816_oz5854_article.pdf
  • help with downloads
 

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, 2011-2021.

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.