Uproar Series II

 

Uproar Series II - plan thumbnail image

Uproar Series II - completed model photo more pics (4)

Uproar Series II  
by Chris Olsen
from RCME
September 1961 
66in span
Tags: IC R/C Cabin
all formers complete :)
got article :)


This plan was found online 23/12/2016 at: https://www.rcgroups.com/forums/showpost.php?p=36470076&postcount=15464
Outerzone planID: oz8278 | Filesize: 832KB | Format: • PDFbitmap | Credit*: RFJ, tri-pacer

   

About this Plan

Uproar Series II - Radio control sport model. The Uproar (oz2220) was first published in Aeromodeller 1958. This here is a modified and refined version of the Uproar design, some 4 years later.

Quote: - "Modifications carried out together with the reasons are as follows: The nose was lengthened to provide more room for the rear venturi of the ETA 29 and a larger tank. This was compensated for by increasing the fin area. It also helped to keep the CG in the right place.
A tricycle U/C was fitted at the beginning of 1961 as a result of Bob Dunham's demonstration in Switzerland and has proved very successful, although beginners would be advised to stick to two wheel gear especially if flying off grass. The engine has been mounted on its side for some time as it makes the positioning of the fuel tank easier, throws most of the oil from the exhaust away from the wing and is less prone to damage in a crash.
The wing section was altered to NACA 0015, which is thinner than the original one and has a very blunt entry. The writer does not favour aerofoil sections with a sharp entry for this purpose as they tend to have rather vicious stall and spin characteristics. The wing incidence was altered from 0 deg to +1 deg to reduce the nose high flying altitude and reduce fuselage drag. The wing construction was completely altered to make the wing more rigid and less prone to warps, while it is slightly more difficult to construct, it is stronger and slightly lighter..."

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User comments

Here are some photos from 1990 showing the maiden flight of my flying buddy Harald's Uproar [more pics 003-006]. The Uproar flew beautifully and this one went on for many years before an aileron servo failed just after take off and it rolled in to destruction. The young lad in the photo is my son Jonathan, now 44 years old, roughly the same age as I was when I took the photos! How time flies. Harald went on to build an Uplift oz6027 to replace the Uproar. Admittedly it was a nicer looking model, but it was a lot more work and really didn't fly appreciably better.
ChrisPinn - 30/11/2017
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