About this Plan
Whittman Buttercup. Scale model utility light plane from April 1952 Flying Models, for .020-.049 power.
Quote: "This semi-scale 1 /2A version of Steve Whittman's famous utility light plane features simplified flying surfaces. Buttercup, by Dick Struhl.
Presented here is a free-flight semi-scale version of Steve Wittman's 'Buttercup' utility lightplane. The original acts as the flying workshop and delivery wagon for the racing team of Wittman and Brennand. Our model counterpart acts merely as a means of having some good consistent flying over weekends.
We chose to power this model with a 1/2A engine and build it to the approximate scale of one inch to the foot, giving a span of 28-1/2 in. The original model was powered with an .020 Infant, and put in several hundred fine flights before a larger Baby Spitfire was installed. Flights with the Infant were slow enough and yet realistic enough to give plenty of fun.
The model was adjusted for a steep glide (no downthrust) so that we could fly on a full tank of gas and still be reasonably certain that the model would return to us. With the larger engines, you will find it necessary to install downthrust in the en-gine and also use some type of de-thermalizer, such as a pop-up tail, etc. There is no question that, if you get the model up high enough, you are going to lose it out of sight..."
Update 25/01/2019: Added article, thanks to RFJ.
Supplementary file notes
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
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.