Upset II

 

Upset II - plan thumbnail image

Upset II - completed model photo more pics (2)

Upset II  
by Chris Olsen
from RCME
April 1968 
52in span
Tags: IC R/C LowWing
all formers complete :)
got article :)


Submitted to Outerzone: 26/09/2017
Outerzone planID: oz9278 | Filesize: 433KB | Format: • PDFbitmap | Credit*: Circlip, RFJ

   

About this Plan

Upset II - Radio control aerobatic competition model, for .61 power.

Quote: - "Upset really started back in 1953 with a Sparky (oz2914) designed by Harry Hundleby, which was my first radio model. About five years later Sparky begat Uproar (oz2220) the only thing in common being the shoulder wing. Uproar was a successful contest model as far as I was concerned, although others thought otherwise. Its only real problem was that it was a functional design and as such was rather ugly. As a result of this and the fact that low wing models tended to have some advantages with the then current contest pattern of 1963, Uproar gave way to Uplift (oz6027) which had an Uproar wing and tail in low wing con-figuration on a streamlined fuselage. This again was fairly successful but was still not quite good enough in my opinion for the current pattern (1964), the main problem being a reluctance to spin and the fact that when flown with reeds, it tended to be rather twitchy. It was therefore decided to build a new model for the Swedish World R/C Championships in 1965, so a new model with tapered wings was designed. Due to the silencer rule which came into force in 1965 it was made smaller than Uplift, 600 instead of 750 sq in, so I could continue using a 49 size motor. However, since the model weighed 6-3/4 lb and had a glide like a brick it was decided to make a larger model and use a 61. This resulted in Upset, which is in many ways similar to Uplift, having the same wing area and weight. However, the wing has a lower aspect ratio as I have found that models seem to roll better if the wings have a short span. The wing taper, apart from looking better, helps the model to spin as the tips stall more readily on a tapered wing than on a parallel chord wing. The tail moment was lengthened to try to make the model smooth in pitch although, whether this has worked I am not sure..."

Upset II, RCM&E, April 1968.

Note this is a low resolution plan.

Direct submission to Outerzone.

Supplementary files

Article pages, thanks to RFJ.

Corrections?

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

 

User comments

No comments yet for this plan. Got something to say about this one? Click here to 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.