Electric Challenge Twin (oz7334)
About this Plan
Electric Challenge Twin. Radio control electric powered twin sport model.
Quote: "Thoughts of a twin electric plane had been running around in my head for quite some time then one day while reading Bob Kopski's column, I came across a reference to Dr Keith Shaw's article published in another magazine regarding the twin theme. This was just the stimulus needed to get the grey matter cooking and start the design process, the development of Electric Challenge - The Twin was under way.
My first thoughts were about the motor power. I have a good selection of Astro Flight cobalts ranging from 15's to 60's, so this was not really a problem and the 15 geared cobalts were finally settled upon. A lot of thought was given as whether to have the props contra-rotate or not. Keith Shaw states in his article that there was 'very little change in performance' between the two options. I decided to go with the contra option. I do have memories of the old WWII warbirds using the contra principle, so I guess that's where it comes from.
Now that the power was decided, a design had to be created based on the guidelines utilizing Keith's formulas and two that have been around for long time. T-L-A-R, That Looks About Right, and K-I-L-S, Keep It Light Stupid. The effort was expended, and the model presented here is the result.
Next question, what batteries to use? I chose the Sanyo 1250 mAh SCR's because of their size, weight, and ability to deliver the punch necessary to get the craft airborne.
Many sketches were made in an attempt to catch an attractive and simple presentation. The lines of my previous design, the Electric Challenge 25 (oz7100) seems to have won. Most of the construction follows this design.
Construction. When starting to build a scratch design, I always make a kit of the parts necessary to build the complete plane. Templates are made of all formers..."
Supplementary file notes
Article pages, text and pics.
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
Electric Challenge Twin
by Charles Evans
from RCMplans (ref:1294)
Electric R/C LowWing Multi
all formers complete :)
got article :)
Found online 21/12/2015 at:
Format: • PDFbitmap
Do you have a photo you'd like to submit for this page? Then email email@example.com
User commentsNo comments yet for this plan. Got something to say about this one?
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, 2011-2019.
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.